diff options
Diffstat (limited to 'LUFA/Drivers/Peripheral/AVR8')
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/ADC.h | 453 | ||||
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/SPI.h | 239 | ||||
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/Serial.c | 89 | ||||
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/Serial.h | 251 | ||||
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/TWI.c | 144 | ||||
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/TWI.h | 286 |
6 files changed, 1462 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/AVR8/ADC.h b/LUFA/Drivers/Peripheral/AVR8/ADC.h new file mode 100644 index 000000000..99f70d14b --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/ADC.h @@ -0,0 +1,453 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief ADC Peripheral Driver (AVR8) + * + * On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC + * peripheral internally. + * + * \note This file should not be included directly. It is automatically included as needed by the ADC driver + * dispatch header located in LUFA/Drivers/Peripheral/ADC.h. + */ + +/** \ingroup Group_ADC + * \defgroup Group_ADC_AVR8 ADC Peripheral Driver (AVR8) + * + * \section Sec_ModDescription Module Description + * On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC + * peripheral internally. + * + * \note This file should not be included directly. It is automatically included as needed by the ADC driver + * dispatch header located in LUFA/Drivers/Peripheral/ADC.h. + * + * \section Sec_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * \code + * // Initialise the ADC driver before first use + * ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32); + * + * // Must setup the ADC channel to read beforehand + * ADC_SetupChannel(1); + * + * // Perform a single conversion of the ADC channel 1 + * ADC_GetChannelReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_CHANNEL1); + * printf("Conversion Result: %d\r\n", ADC_GetResult()); + * + * // Start reading ADC channel 1 in free running (continuous conversion) mode + * ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_CHANNEL1); + * while (!(ADC_IsReadingComplete())) {}; + * printf("Conversion Result: %d\r\n", ADC_GetResult()); + * \endcode + * + * @{ + */ + +#ifndef __ADC_AVR8_H__ +#define __ADC_AVR8_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_ADC_H) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/ADC.h instead. + #endif + + #if !(defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \ + defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \ + defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || \ + defined(__AVR_ATmega32U6__)) + #error The ADC peripheral driver is not currently available for your selected microcontroller model. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* Macros: */ + #define _ADC_GET_MUX_MASK2(y) ADC_CHANNEL ## y + #define _ADC_GET_MUX_MASK(y) _ADC_GET_MUX_MASK2(y) + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name ADC Reference Configuration Masks */ + //@{ + /** Reference mask, for using the voltage present at the AVR's AREF pin for the ADC reference. */ + #define ADC_REFERENCE_AREF 0 + + /** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */ + #define ADC_REFERENCE_AVCC (1 << REFS0) + + /** Reference mask, for using the internally generated 2.56V reference voltage as the ADC reference. */ + #define ADC_REFERENCE_INT2560MV ((1 << REFS1) | (1 << REFS0)) + //@} + + /** \name ADC Result Adjustment Configuration Masks */ + //@{ + /** Left-adjusts the 10-bit ADC result, so that the upper 8 bits of the value returned by the + * \ref ADC_GetResult() macro contain the 8 most significant bits of the result. + */ + #define ADC_LEFT_ADJUSTED (1 << ADLAR) + + /** Right-adjusts the 10-bit ADC result, so that the lower 8 bits of the value returned by the + * \ref ADC_GetResult() macro contain the 8 least significant bits of the result. + */ + #define ADC_RIGHT_ADJUSTED (0 << ADLAR) + //@} + + /** \name ADC Mode Configuration Masks */ + //@{ + /** Sets the ADC mode to free running, so that conversions take place continuously as fast as the ADC + * is capable of at the given input clock speed. + */ + #define ADC_FREE_RUNNING (1 << ADATE) + + /** Sets the ADC mode to single conversion, so that only a single conversion will take place before + * the ADC returns to idle. + */ + #define ADC_SINGLE_CONVERSION (0 << ADATE) + //@} + + /** \name ADC Prescaler Configuration Masks */ + //@{ + /** Sets the ADC input clock to prescale by a factor of 2 the AVR's system clock. */ + #define ADC_PRESCALE_2 (1 << ADPS0) + + /** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */ + #define ADC_PRESCALE_4 (1 << ADPS1) + + /** Sets the ADC input clock to prescale by a factor of 8 the AVR's system clock. */ + #define ADC_PRESCALE_8 ((1 << ADPS0) | (1 << ADPS1)) + + /** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */ + #define ADC_PRESCALE_16 (1 << ADPS2) + + /** Sets the ADC input clock to prescale by a factor of 32 the AVR's system clock. */ + #define ADC_PRESCALE_32 ((1 << ADPS2) | (1 << ADPS0)) + + /** Sets the ADC input clock to prescale by a factor of 64 the AVR's system clock. */ + #define ADC_PRESCALE_64 ((1 << ADPS2) | (1 << ADPS1)) + + /** Sets the ADC input clock to prescale by a factor of 128 the AVR's system clock. */ + #define ADC_PRESCALE_128 ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0)) + //@} + + /** \name ADC MUX Masks */ + //@{ + /** MUX mask define for the ADC0 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_CHANNEL0 (0x00 << MUX0) + + /** MUX mask define for the ADC1 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_CHANNEL1 (0x01 << MUX0) + + #if !(defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__)) + /** MUX mask define for the ADC2 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL2 (0x02 << MUX0) + + /** MUX mask define for the ADC3 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL3 (0x03 << MUX0) + #endif + + /** MUX mask define for the ADC4 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_CHANNEL4 (0x04 << MUX0) + + /** MUX mask define for the ADC5 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_CHANNEL5 (0x05 << MUX0) + + /** MUX mask define for the ADC6 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_CHANNEL6 (0x06 << MUX0) + + /** MUX mask define for the ADC7 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */ + #define ADC_CHANNEL7 (0x07 << MUX0) + + /** MUX mask define for the internal 1.1V bandgap channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */ + #define ADC_1100MV_BANDGAP (0x1E << MUX0) + + #if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__)) + /** MUX mask define for the ADC8 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL8 ((1 << 8) | (0x00 << MUX0)) + + /** MUX mask define for the ADC9 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL9 ((1 << 8) | (0x01 << MUX0)) + + /** MUX mask define for the ADC10 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL10 ((1 << 8) | (0x02 << MUX0)) + + /** MUX mask define for the ADC11 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL11 ((1 << 8) | (0x03 << MUX0)) + + /** MUX mask define for the ADC12 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL12 ((1 << 8) | (0x04 << MUX0)) + + /** MUX mask define for the ADC13 channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_CHANNEL13 ((1 << 8) | (0x05 << MUX0)) + + /** MUX mask define for the internal temperature sensor channel of the ADC. See \ref ADC_StartReading() and + * \ref ADC_GetChannelReading(). + * + * \note Not available on all AVR models. + */ + #define ADC_INT_TEMP_SENS ((1 << 8) | (0x07 << MUX0)) + #endif + + /** Retrieves the ADC MUX mask for the given ADC channel number. + * + * \note This macro will only work correctly on channel numbers that are compile-time + * constants defined by the preprocessor. + * + * \param[in] Channel Index of the ADC channel whose MUX mask is to be retrieved. + */ + #define ADC_GET_CHANNEL_MASK(Channel) _ADC_GET_MUX_MASK(Channel) + //@} + + /* Inline Functions: */ + /** Configures the given ADC channel, ready for ADC conversions. This function sets the + * associated port pin as an input and disables the digital portion of the I/O to reduce + * power consumption. + * + * \note This must only be called for ADC channels with are connected to a physical port + * pin of the AVR, denoted by its special alternative function ADCx. + * \n\n + * + * \note The channel number must be specified as an integer, and <b>not</b> a \c ADC_CHANNEL* mask. + * + * \param[in] ChannelIndex ADC channel number to set up for conversions. + */ + static inline void ADC_SetupChannel(const uint8_t ChannelIndex) + { + #if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \ + defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \ + defined(__AVR_ATmega32U6__)) + DDRF &= ~(1 << ChannelIndex); + DIDR0 |= (1 << ChannelIndex); + #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) + if (ChannelIndex < 8) + { + DDRF &= ~(1 << ChannelIndex); + DIDR0 |= (1 << ChannelIndex); + } + else if (ChannelIndex == 8) + { + DDRD &= ~(1 << 4); + DIDR2 |= (1 << 0); + } + else if (ChannelIndex < 11) + { + DDRD &= ~(1 << (ChannelIndex - 3)); + DIDR2 |= (1 << (ChannelIndex - 8)); + } + else + { + DDRB &= ~(1 << (ChannelIndex - 7)); + DIDR2 |= (1 << (ChannelIndex - 8)); + } + #endif + } + + /** De-configures the given ADC channel, re-enabling digital I/O mode instead of analog. This + * function sets the associated port pin as an input and re-enabled the digital portion of + * the I/O. + * + * \note This must only be called for ADC channels with are connected to a physical port + * pin of the AVR, denoted by its special alternative function ADCx. + * \n\n + * + * \note The channel number must be specified as an integer, and <b>not</b> a \c ADC_CHANNEL* mask. + * + * \param[in] ChannelIndex ADC channel number to set up for conversions. + */ + static inline void ADC_DisableChannel(const uint8_t ChannelIndex) + { + #if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \ + defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \ + defined(__AVR_ATmega32U6__)) + DDRF &= ~(1 << ChannelIndex); + DIDR0 &= ~(1 << ChannelIndex); + #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) + if (ChannelIndex < 8) + { + DDRF &= ~(1 << ChannelIndex); + DIDR0 &= ~(1 << ChannelIndex); + } + else if (ChannelIndex == 8) + { + DDRD &= ~(1 << 4); + DIDR2 &= ~(1 << 0); + } + else if (ChannelIndex < 11) + { + DDRD &= ~(1 << (ChannelIndex - 3)); + DIDR2 &= ~(1 << (ChannelIndex - 8)); + } + else + { + DDRB &= ~(1 << (ChannelIndex - 7)); + DIDR2 &= ~(1 << (ChannelIndex - 8)); + } + #endif + } + + /** Starts the reading of the given channel, but does not wait until the conversion has completed. + * Once executed, the conversion status can be determined via the \ref ADC_IsReadingComplete() macro and + * the result read via the \ref ADC_GetResult() macro. + * + * If the ADC has been initialized in free running mode, calling this function once will begin the repeated + * conversions. If the ADC is in single conversion mode (or the channel to convert from is to be changed), + * this function must be called each time a conversion is to take place. + * + * \param[in] MUXMask ADC channel mask, reference mask and adjustment mask. + */ + static inline void ADC_StartReading(const uint16_t MUXMask) + { + ADMUX = MUXMask; + + #if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__)) + if (MUXMask & (1 << 8)) + ADCSRB |= (1 << MUX5); + else + ADCSRB &= ~(1 << MUX5); + #endif + + ADCSRA |= (1 << ADSC); + } + + /** Indicates if the current ADC conversion is completed, or still in progress. + * + * \return Boolean false if the reading is still taking place, or true if the conversion is + * complete and ready to be read out with \ref ADC_GetResult(). + */ + static inline bool ADC_IsReadingComplete(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE; + static inline bool ADC_IsReadingComplete(void) + { + return ((ADCSRA & (1 << ADIF)) ? true : false); + } + + /** Retrieves the conversion value of the last completed ADC conversion and clears the reading + * completion flag. + * + * \return The result of the last ADC conversion as an unsigned value. + */ + static inline uint16_t ADC_GetResult(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE; + static inline uint16_t ADC_GetResult(void) + { + ADCSRA |= (1 << ADIF); + return ADC; + } + + /** Performs a complete single reading from channel, including a polling spin-loop to wait for the + * conversion to complete, and the returning of the converted value. + * + * \note For free running mode, the automated conversions should be initialized with a single call + * to \ref ADC_StartReading() to select the channel and begin the automated conversions, and + * the results read directly from the \ref ADC_GetResult() instead to reduce overhead. + * + * \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask. + */ + static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask) ATTR_WARN_UNUSED_RESULT; + static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask) + { + ADC_StartReading(MUXMask); + + while (!(ADC_IsReadingComplete())); + + return ADC_GetResult(); + } + + /** Initialises the ADC, ready for conversions. This must be called before any other ADC operations. + * The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and + * prescaler masks. + * + * \param[in] Mode Mask of ADC prescale and mode settings. + */ + static inline void ADC_Init(uint8_t Mode) ATTR_ALWAYS_INLINE; + static inline void ADC_Init(uint8_t Mode) + { + ADCSRA = ((1 << ADEN) | Mode); + } + + /** Turns off the ADC. If this is called, any further ADC operations will require a call to + * \ref ADC_Init() before the ADC can be used again. + */ + static inline void ADC_Disable(void) ATTR_ALWAYS_INLINE; + static inline void ADC_Disable(void) + { + ADCSRA = 0; + } + + /** Indicates if the ADC is currently enabled. + * + * \return Boolean \c true if the ADC subsystem is currently enabled, \c false otherwise. + */ + static inline bool ADC_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE; + static inline bool ADC_GetStatus(void) + { + return ((ADCSRA & (1 << ADEN)) ? true : false); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/AVR8/SPI.h b/LUFA/Drivers/Peripheral/AVR8/SPI.h new file mode 100644 index 000000000..d800fca1a --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/SPI.h @@ -0,0 +1,239 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief SPI Peripheral Driver (AVR8) + * + * On-chip SPI driver for the 8-bit AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI driver + * dispatch header located in LUFA/Drivers/Peripheral/SPI.h. + */ + +/** \ingroup Group_SPI + * \defgroup Group_SPI_AVR8 SPI Peripheral Driver (AVR8) + * + * \section Sec_ModDescription Module Description + * Driver for the hardware SPI port available on most 8-bit AVR microcontroller models. This + * module provides an easy to use driver for the setup and transfer of data over the + * AVR's SPI port. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI driver + * dispatch header located in LUFA/Drivers/Peripheral/SPI.h. + * + * \section Sec_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * \code + * // Initialise the SPI driver before first use + * SPI_Init(SPI_SPEED_FCPU_DIV_2 | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_FALLING | + * SPI_SAMPLE_TRAILING | SPI_MODE_MASTER); + * + * // Send several bytes, ignoring the returned data + * SPI_SendByte(0x01); + * SPI_SendByte(0x02); + * SPI_SendByte(0x03); + * + * // Receive several bytes, sending a dummy 0x00 byte each time + * uint8_t Byte1 = SPI_ReceiveByte(); + * uint8_t Byte2 = SPI_ReceiveByte(); + * uint8_t Byte3 = SPI_ReceiveByte(); + * + * // Send a byte, and store the received byte from the same transaction + * uint8_t ResponseByte = SPI_TransferByte(0xDC); + * \endcode + * + * @{ + */ + +#ifndef __SPI_AVR8_H__ +#define __SPI_AVR8_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SPI_H) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/SPI.h instead. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* Macros: */ + #define SPI_USE_DOUBLESPEED (1 << SPE) + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name SPI Prescaler Configuration Masks */ + //@{ + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 2. */ + #define SPI_SPEED_FCPU_DIV_2 SPI_USE_DOUBLESPEED + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 4. */ + #define SPI_SPEED_FCPU_DIV_4 0 + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 8. */ + #define SPI_SPEED_FCPU_DIV_8 (SPI_USE_DOUBLESPEED | (1 << SPR0)) + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 16. */ + #define SPI_SPEED_FCPU_DIV_16 (1 << SPR0) + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 32. */ + #define SPI_SPEED_FCPU_DIV_32 (SPI_USE_DOUBLESPEED | (1 << SPR1)) + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 64. */ + #define SPI_SPEED_FCPU_DIV_64 (SPI_USE_DOUBLESPEED | (1 << SPR1) | (1 << SPR0)) + + /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 128. */ + #define SPI_SPEED_FCPU_DIV_128 ((1 << SPR1) | (1 << SPR0)) + //@} + + /** \name SPI SCK Polarity Configuration Masks */ + //@{ + /** SPI clock polarity mask for \c SPI_Init(). Indicates that the SCK should lead on the rising edge. */ + #define SPI_SCK_LEAD_RISING (0 << CPOL) + + /** SPI clock polarity mask for \c SPI_Init(). Indicates that the SCK should lead on the falling edge. */ + #define SPI_SCK_LEAD_FALLING (1 << CPOL) + //@} + + /** \name SPI Sample Edge Configuration Masks */ + //@{ + /** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should sampled on the leading edge. */ + #define SPI_SAMPLE_LEADING (0 << CPHA) + + /** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should be sampled on the trailing edge. */ + #define SPI_SAMPLE_TRAILING (1 << CPHA) + //@} + + /** \name SPI Data Ordering Configuration Masks */ + //@{ + /** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */ + #define SPI_ORDER_MSB_FIRST (0 << DORD) + + /** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */ + #define SPI_ORDER_LSB_FIRST (1 << DORD) + //@} + + /** \name SPI Mode Configuration Masks */ + //@{ + /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */ + #define SPI_MODE_SLAVE (0 << MSTR) + + /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */ + #define SPI_MODE_MASTER (1 << MSTR) + //@} + + /* Inline Functions: */ + /** Initialises the SPI subsystem, ready for transfers. Must be called before calling any other + * SPI routines. + * + * \param[in] SPIOptions SPI Options, a mask consisting of one of each of the \c SPI_SPEED_*, + * \c SPI_SCK_*, \c SPI_SAMPLE_*, \c SPI_ORDER_* and \c SPI_MODE_* masks. + */ + static inline void SPI_Init(const uint8_t SPIOptions) + { + DDRB |= ((1 << 1) | (1 << 2)); + DDRB &= ~((1 << 0) | (1 << 3)); + PORTB |= ((1 << 0) | (1 << 3)); + + SPCR = ((1 << SPE) | SPIOptions); + + if (SPIOptions & SPI_USE_DOUBLESPEED) + SPSR |= (1 << SPI2X); + else + SPSR &= ~(1 << SPI2X); + } + + /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */ + static inline void SPI_Disable(void) + { + DDRB &= ~((1 << 1) | (1 << 2)); + PORTB &= ~((1 << 0) | (1 << 3)); + + SPCR = 0; + SPSR = 0; + } + + /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete. + * + * \param[in] Byte Byte to send through the SPI interface. + * + * \return Response byte from the attached SPI device. + */ + static inline uint8_t SPI_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE; + static inline uint8_t SPI_TransferByte(const uint8_t Byte) + { + SPDR = Byte; + while (!(SPSR & (1 << SPIF))); + return SPDR; + } + + /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response + * byte sent to from the attached SPI device is ignored. + * + * \param[in] Byte Byte to send through the SPI interface. + */ + static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE; + static inline void SPI_SendByte(const uint8_t Byte) + { + SPDR = Byte; + while (!(SPSR & (1 << SPIF))); + } + + /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response + * byte from the attached SPI device is returned. + * + * \return The response byte from the attached SPI device. + */ + static inline uint8_t SPI_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT; + static inline uint8_t SPI_ReceiveByte(void) + { + SPDR = 0x00; + while (!(SPSR & (1 << SPIF))); + return SPDR; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/AVR8/Serial.c b/LUFA/Drivers/Peripheral/AVR8/Serial.c new file mode 100644 index 000000000..3a8312d85 --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/Serial.c @@ -0,0 +1,89 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +#define __INCLUDE_FROM_SERIAL_C +#include "Serial.h" + +FILE USARTSerialStream; + +int Serial_putchar(char DataByte, + FILE *Stream) +{ + (void)Stream; + + Serial_SendByte(DataByte); + return 0; +} + +int Serial_getchar(FILE *Stream) +{ + (void)Stream; + + if (!(Serial_IsCharReceived())) + return _FDEV_EOF; + + return Serial_ReceiveByte(); +} + +int Serial_getchar_Blocking(FILE *Stream) +{ + (void)Stream; + + while (!(Serial_IsCharReceived())); + return Serial_ReceiveByte(); +} + +void Serial_SendString_P(const char* FlashStringPtr) +{ + uint8_t CurrByte; + + while ((CurrByte = pgm_read_byte(FlashStringPtr)) != 0x00) + { + Serial_SendByte(CurrByte); + FlashStringPtr++; + } +} + +void Serial_SendString(const char* StringPtr) +{ + uint8_t CurrByte; + + while ((CurrByte = *StringPtr) != 0x00) + { + Serial_SendByte(CurrByte); + StringPtr++; + } +} + +void Serial_SendData(const uint8_t* Buffer, uint16_t Length) +{ + while (Length--) + Serial_SendByte(*(Buffer++)); +} diff --git a/LUFA/Drivers/Peripheral/AVR8/Serial.h b/LUFA/Drivers/Peripheral/AVR8/Serial.h new file mode 100644 index 000000000..bb9ba856e --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/Serial.h @@ -0,0 +1,251 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Serial USART Peripheral Driver (AVR8) + * + * On-chip serial USART driver for the 8-bit AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the USART driver + * dispatch header located in LUFA/Drivers/Peripheral/Serial.h. + */ + +/** \ingroup Group_Serial + * \defgroup Group_Serial_AVR8 Serial USART Peripheral Driver (AVR8) + * + * \section Sec_ModDescription Module Description + * On-chip serial USART driver for the 8-bit AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the ADC driver + * dispatch header located in LUFA/Drivers/Peripheral/Serial.h. + * + * \section Sec_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * \code + * // Initialise the serial USART driver before first use, with 9600 baud (and no double-speed mode) + * Serial_Init(9600, false); + * + * // Send a string through the USART + * Serial_TxString("Test String\r\n"); + * + * // Receive a byte through the USART + * uint8_t DataByte = Serial_RxByte(); + * \endcode + * + * @{ + */ + +#ifndef __SERIAL_AVR8_H__ +#define __SERIAL_AVR8_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + #include "../../Misc/TerminalCodes.h" + + #include <stdio.h> + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SERIAL_H) && !defined(__INCLUDE_FROM_SERIAL_C) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* External Variables: */ + extern FILE USARTSerialStream; + + /* Function Prototypes: */ + int Serial_putchar(char DataByte, + FILE *Stream); + int Serial_getchar(FILE *Stream); + int Serial_getchar_Blocking(FILE *Stream); + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is + * not set. + */ + #define SERIAL_UBBRVAL(baud) ((((F_CPU / 16) + (baud / 2)) / (baud)) - 1) + + /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is + * set. + */ + #define SERIAL_2X_UBBRVAL(baud) ((((F_CPU / 8) + (baud / 2)) / (baud)) - 1) + + /* Function Prototypes: */ + /** Transmits a given string located in program space (FLASH) through the USART. + * + * \param[in] FlashStringPtr Pointer to a string located in program space. + */ + void Serial_SendString_P(const char* FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given string located in SRAM memory through the USART. + * + * \param[in] StringPtr Pointer to a string located in SRAM space. + */ + void Serial_SendString(const char* StringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given buffer located in SRAM memory through the USART. + * + * \param[in] Buffer Pointer to a buffer containing the data to send. + * \param[in] Length Length of the data to send, in bytes. + */ + void Serial_SendData(const uint8_t* Buffer, uint16_t Length) ATTR_NON_NULL_PTR_ARG(1); + + /* Inline Functions: */ + /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to + * standard 8-bit, no parity, 1 stop bit settings suitable for most applications. + * + * \param[in] BaudRate Serial baud rate, in bits per second. + * \param[in] DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate. + */ + static inline void Serial_Init(const uint32_t BaudRate, + const bool DoubleSpeed) + { + UBRR1 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate)); + + UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10)); + UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0); + UCSR1B = ((1 << TXEN1) | (1 << RXEN1)); + + DDRD |= (1 << 3); + PORTD |= (1 << 2); + } + + /** Turns off the USART driver, disabling and returning used hardware to their default configuration. */ + static inline void Serial_Disable(void) + { + UCSR1B = 0; + UCSR1A = 0; + UCSR1C = 0; + + UBRR1 = 0; + + DDRD &= ~(1 << 3); + PORTD &= ~(1 << 2); + } + + /** Creates a standard character stream from the USART so that it can be used with all the regular functions + * in the avr-libc \c <stdio.h> library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created + * stream is bidirectional and can be used for both input and output functions. + * + * Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single + * fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may + * be used when the read data is processed byte-per-bye (via \c getc()) or when the user application will implement its own + * line buffering. + * + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL stdio + * and stdin will be configured to use the USART. + * + * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used. + */ + static inline void Serial_CreateStream(FILE* Stream) + { + if (!(Stream)) + { + Stream = &USARTSerialStream; + stdin = Stream; + stdout = Stream; + } + + *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW); + } + + /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates + * the transfer. + * + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL stdio + * and stdin will be configured to use the USART. + * + * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used. + */ + static inline void Serial_CreateBlockingStream(FILE* Stream) + { + if (!(Stream)) + { + Stream = &USARTSerialStream; + stdin = Stream; + stdout = Stream; + } + + *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar_Blocking, _FDEV_SETUP_RW); + } + + /** Indicates whether a character has been received through the USART. + * + * \return Boolean \c true if a character has been received, \c false otherwise. + */ + static inline bool Serial_IsCharReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE; + static inline bool Serial_IsCharReceived(void) + { + return ((UCSR1A & (1 << RXC1)) ? true : false); + } + + /** Transmits a given byte through the USART. + * + * \param[in] DataByte Byte to transmit through the USART. + */ + static inline void Serial_SendByte(const char DataByte) ATTR_ALWAYS_INLINE; + static inline void Serial_SendByte(const char DataByte) + { + while (!(UCSR1A & (1 << UDRE1))); + UDR1 = DataByte; + } + + /** Receives the next byte from the USART. + * + * \return Next byte received from the USART, or a negative value if no byte has been received. + */ + static inline int16_t Serial_ReceiveByte(void) ATTR_ALWAYS_INLINE; + static inline int16_t Serial_ReceiveByte(void) + { + if (!(Serial_IsCharReceived())) + return -1; + + return UDR1; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/AVR8/TWI.c b/LUFA/Drivers/Peripheral/AVR8/TWI.c new file mode 100644 index 000000000..b5f258dd3 --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/TWI.c @@ -0,0 +1,144 @@ +/* + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +#define __INCLUDE_FROM_TWI_C +#include "TWI.h" + +uint8_t TWI_StartTransmission(const uint8_t SlaveAddress, + const uint8_t TimeoutMS) +{ + for (;;) + { + bool BusCaptured = false; + uint16_t TimeoutRemaining; + + TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN)); + + TimeoutRemaining = (TimeoutMS * 100); + while (TimeoutRemaining-- && !(BusCaptured)) + { + if (TWCR & (1 << TWINT)) + { + switch (TWSR & TW_STATUS_MASK) + { + case TW_START: + case TW_REP_START: + BusCaptured = true; + break; + case TW_MT_ARB_LOST: + TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN)); + continue; + default: + TWCR = (1 << TWEN); + return TWI_ERROR_BusFault; + } + } + + _delay_us(10); + } + + if (!(TimeoutRemaining)) + { + TWCR = (1 << TWEN); + return TWI_ERROR_BusCaptureTimeout; + } + + TWDR = SlaveAddress; + TWCR = ((1 << TWINT) | (1 << TWEN)); + + TimeoutRemaining = (TimeoutMS * 100); + while (TimeoutRemaining--) + { + if (TWCR & (1 << TWINT)) + break; + + _delay_us(10); + } + + if (!(TimeoutRemaining)) + return TWI_ERROR_SlaveResponseTimeout; + + switch (TWSR & TW_STATUS_MASK) + { + case TW_MT_SLA_ACK: + case TW_MR_SLA_ACK: + return TWI_ERROR_NoError; + default: + TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN)); + return TWI_ERROR_SlaveNotReady; + } + } +} + +uint8_t TWI_ReadPacket(const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + uint8_t* Buffer, + uint8_t Length) +{ + uint8_t ErrorCode; + + if ((ErrorCode = TWI_WritePacket(SlaveAddress, TimeoutMS, InternalAddress, InternalAddressLen, + NULL, 0)) != TWI_ERROR_NoError) + { + return ErrorCode; + } + + if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_READ, + TimeoutMS)) == TWI_ERROR_NoError) + { + while (Length--) + { + if (!(TWI_ReceiveByte(Buffer++, (Length == 0)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + TWI_StopTransmission(); + } + + return ErrorCode; +} + +uint8_t TWI_WritePacket(const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + const uint8_t* Buffer, + uint8_t Length) +{ + uint8_t ErrorCode; + + if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE, + TimeoutMS)) == TWI_ERROR_NoError) + { + while (InternalAddressLen--) + { + if (!(TWI_SendByte(*(InternalAddress++)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + while (Length--) + { + if (!(TWI_SendByte(*(Buffer++)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + TWI_StopTransmission(); + } + + return ErrorCode; +} diff --git a/LUFA/Drivers/Peripheral/AVR8/TWI.h b/LUFA/Drivers/Peripheral/AVR8/TWI.h new file mode 100644 index 000000000..e03423385 --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/TWI.h @@ -0,0 +1,286 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief TWI Peripheral Driver (AVR8) + * + * On-chip TWI driver for the 8-bit AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the TWI driver + * dispatch header located in LUFA/Drivers/Peripheral/TWI.h. + */ + +/** \ingroup Group_TWI + * \defgroup Group_TWI_AVR8 TWI Peripheral Driver (AVR8) + * + * \section Sec_ModDescription Module Description + * Master mode TWI driver for the 8-bit AVR microcontrollers which contain a hardware TWI module. + * + * \note This file should not be included directly. It is automatically included as needed by the TWI driver + * dispatch header located in LUFA/Drivers/Peripheral/TWI.h. + * + * \section Sec_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * <b>Low Level API Example:</b> + * \code + * // Initialise the TWI driver before first use + * TWI_Init(); + * + * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout + * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_WRITE, 10)) + * { + * TWI_SendByte(0xDC); + * + * TWI_SendByte(0x01); + * TWI_SendByte(0x02); + * TWI_SendByte(0x03); + * + * // Must stop transmission afterwards to release the bus + * TWI_StopTransmission(); + * } + * + * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout + * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_WRITE, 10)) + * { + * TWI_SendByte(0xDC); + * TWI_StopTransmission(); + * + * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_READ, 10)) + * { + * uint8_t Byte1, Byte2, Byte3; + * + * // Read three bytes, acknowledge after the third byte is received + * TWI_ReceiveByte(&Byte1, false); + * TWI_ReceiveByte(&Byte2, false); + * TWI_ReceiveByte(&Byte3, true); + * + * // Must stop transmission afterwards to release the bus + * TWI_StopTransmission(); + * } + * } + * \endcode + * + * <b>High Level API Example:</b> + * \code + * // Initialise the TWI driver before first use + * TWI_Init(); + * + * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout + * uint8_t InternalWriteAddress = 0xDC; + * uint8_t WritePacket[3] = {0x01, 0x02, 0x03}; + * + * TWI_WritePacket(0xA0, 10, &InternalWriteAddress, sizeof(InternalWriteAddress), + * &WritePacket, sizeof(WritePacket); + * + * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout + * uint8_t InternalReadAddress = 0xDC; + * uint8_t ReadPacket[3]; + * + * TWI_ReadPacket(0xA0, 10, &InternalReadAddress, sizeof(InternalReadAddress), + * &ReadPacket, sizeof(ReadPacket); + * \endcode + * + * @{ + */ + +#ifndef __TWI_AVR8_H__ +#define __TWI_AVR8_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + #include <stdio.h> + #include <util/twi.h> + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_TWI_H) && !defined(__INCLUDE_FROM_TWI_C) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/TWI.h instead. + #endif + + #if !(defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \ + defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \ + defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || \ + defined(__AVR_ATmega32U6__)) + #error The TWI peripheral driver is not currently available for your selected microcontroller model. + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** TWI slave device address mask for a read session. Mask with a slave device base address to obtain + * the correct TWI bus address for the slave device when reading data from it. + */ + #define TWI_ADDRESS_READ 0x00 + + /** TWI slave device address mask for a write session. Mask with a slave device base address to obtain + * the correct TWI bus address for the slave device when writing data to it. + */ + #define TWI_ADDRESS_WRITE 0x01 + + /** Mask to retrieve the base address for a TWI device, which can then be ORed with \ref TWI_ADDRESS_READ + * or \ref TWI_ADDRESS_WRITE to obtain the device's read and write address respectively. + */ + #define TWI_DEVICE_ADDRESS_MASK 0xFE + + /* Enums: */ + /** Enum for the possible return codes of the TWI transfer start routine and other dependant TWI functions. */ + enum TWI_ErrorCodes_t + { + TWI_ERROR_NoError = 0, /**< Indicates that the command completed sucessfully. */ + TWI_ERROR_BusFault = 1, /**< A TWI bus fault occurred while attempting to capture the bus. */ + TWI_ERROR_BusCaptureTimeout = 2, /**< A timeout occurred whilst waiting for the bus to be ready. */ + TWI_ERROR_SlaveResponseTimeout = 3, /**< No ACK received at the nominated slave address within the timeout period. */ + TWI_ERROR_SlaveNotReady = 4, /**< Slave NAKed the TWI bus START condition. */ + TWI_ERROR_SlaveNAK = 5, /**< Slave NAKed whilst attempting to send data to the device. */ + }; + + /* Inline Functions: */ + /** Initialises the TWI hardware into master mode, ready for data transmission and reception. This must be + * before any other TWI operations. + */ + static inline void TWI_Init(void) ATTR_ALWAYS_INLINE; + static inline void TWI_Init(void) + { + TWCR |= (1 << TWEN); + } + + /** Turns off the TWI driver hardware. If this is called, any further TWI operations will require a call to + * \ref TWI_Init() before the TWI can be used again. + */ + static inline void TWI_Disable(void) ATTR_ALWAYS_INLINE; + static inline void TWI_Disable(void) + { + TWCR &= ~(1 << TWEN); + } + + /** Sends a TWI STOP onto the TWI bus, terminating communication with the currently addressed device. */ + static inline void TWI_StopTransmission(void) ATTR_ALWAYS_INLINE; + static inline void TWI_StopTransmission(void) + { + TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN)); + } + + /** Sends a byte to the currently addressed device on the TWI bus. + * + * \param[in] Byte Byte to send to the currently addressed device + * + * \return Boolean \c true if the recipient ACKed the byte, \c false otherwise + */ + static inline bool TWI_SendByte(const uint8_t Byte) + { + TWDR = Byte; + TWCR = ((1 << TWINT) | (1 << TWEN)); + while (!(TWCR & (1 << TWINT))); + + return ((TWSR & TW_STATUS_MASK) == TW_MT_DATA_ACK); + } + + /** Receives a byte from the currently addressed device on the TWI bus. + * + * \param[in] Byte Location where the read byte is to be stored + * \param[in] LastByte Indicates if the byte should be ACKed if false, NAKed if true + * + * \return Boolean \c true if the byte reception successfully completed, \c false otherwise + */ + static inline uint8_t TWI_ReceiveByte(uint8_t* const Byte, + const bool LastByte) + { + uint8_t TWCRMask = ((1 << TWINT) | (1 << TWEN)); + + if (!(LastByte)) + TWCRMask |= (1 << TWEA); + + TWCR = TWCRMask; + while (!(TWCR & (1 << TWINT))); + *Byte = TWDR; + + return ((TWSR & TW_STATUS_MASK) == TW_MR_DATA_ACK); + } + + /* Function Prototypes: */ + /** Begins a master mode TWI bus communication with the given slave device address. + * + * \param[in] SlaveAddress Address of the slave TWI device to communicate with + * \param[in] TimeoutMS Timeout period within which the slave must respond, in milliseconds + * + * \return A value from the \ref TWI_ErrorCodes_t enum + */ + uint8_t TWI_StartTransmission(const uint8_t SlaveAddress, + const uint8_t TimeoutMS); + + /** High level function to perform a complete packet transfer over the TWI bus to the specified + * device. + * + * \param[in] SlaveAddress Base address of the TWI slave device to communicate with + * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds + * \param[in] InternalAddress Pointer to a location where the internal slave read start address is stored + * \param[in] InternalAddressLen Size of the internal device address, in bytes + * \param[in] Buffer Pointer to a buffer where the read packet data is to be stored + * \param[in] Length Size of the packet to read, in bytes + */ + uint8_t TWI_ReadPacket(const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + uint8_t* Buffer, + uint8_t Length); + + /** High level function to perform a complete packet transfer over the TWI bus from the specified + * device. + * + * \param[in] SlaveAddress Base address of the TWI slave device to communicate with + * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds + * \param[in] InternalAddress Pointer to a location where the internal slave write start address is stored + * \param[in] InternalAddressLen Size of the internal device address, in bytes + * \param[in] Buffer Pointer to a buffer where the packet data to send is stored + * \param[in] Length Size of the packet to send, in bytes + */ + uint8_t TWI_WritePacket(const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + const uint8_t* Buffer, + uint8_t Length); + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |