diff options
Diffstat (limited to 'Projects/AVRISP/Lib/PDITarget.c')
-rw-r--r-- | Projects/AVRISP/Lib/PDITarget.c | 335 |
1 files changed, 0 insertions, 335 deletions
diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c deleted file mode 100644 index 2c6ffd9a6..000000000 --- a/Projects/AVRISP/Lib/PDITarget.c +++ /dev/null @@ -1,335 +0,0 @@ -/*
- LUFA Library
- Copyright (C) Dean Camera, 2009.
-
- dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
-*/
-
-/*
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, and distribute this software
- and its documentation for any purpose and without fee is hereby
- granted, 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
- *
- * Target-related functions for the PDI Protocol decoder.
- */
-
-#define INCLUDE_FROM_PDITARGET_C
-#include "PDITarget.h"
-
-#if defined(ENABLE_PDI_PROTOCOL) || defined(__DOXYGEN__)
-
-/** Flag to indicate if the USART is currently in Tx or Rx mode. */
-volatile bool IsSending;
-
-#if !defined(PDI_VIA_HARDWARE_USART)
-/** Software USART raw frame bits for transmission/reception. */
-volatile uint16_t SoftUSART_Data;
-
-/** Bits remaining to be sent or received via the software USART - set as a GPIOR for speed. */
-#define SoftUSART_BitCount GPIOR2
-
-
-/** ISR to manage the software USART when bit-banged USART mode is selected. */
-ISR(TIMER1_COMPA_vect, ISR_BLOCK)
-{
- /* Toggle CLOCK pin in a single cycle (see AVR datasheet) */
- BITBANG_PDICLOCK_PIN |= BITBANG_PDICLOCK_MASK;
-
- /* If not sending or receiving, just exit */
- if (!(SoftUSART_BitCount))
- return;
-
- /* Check to see if we are at a rising or falling edge of the clock */
- if (BITBANG_PDICLOCK_PORT & BITBANG_PDICLOCK_MASK)
- {
- /* If at rising clock edge and we are in send mode, abort */
- if (IsSending)
- return;
-
- /* Wait for the start bit when receiving */
- if ((SoftUSART_BitCount == BITS_IN_PDI_FRAME) && (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK))
- return;
-
- /* Shift in the bit one less than the frame size in position, so that the start bit will eventually
- * be discarded leaving the data to be byte-aligned for quick access */
- if (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)
- SoftUSART_Data |= (1 << (BITS_IN_PDI_FRAME - 1));
-
- SoftUSART_Data >>= 1;
- SoftUSART_BitCount--;
- }
- else
- {
- /* If at falling clock edge and we are in receive mode, abort */
- if (!IsSending)
- return;
-
- /* Set the data line to the next bit value */
- if (SoftUSART_Data & 0x01)
- BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
- else
- BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
-
- SoftUSART_Data >>= 1;
- SoftUSART_BitCount--;
- }
-}
-#endif
-
-/** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
-void PDITarget_EnableTargetPDI(void)
-{
-#if defined(PDI_VIA_HARDWARE_USART)
- /* Set Tx and XCK as outputs, Rx as input */
- DDRD |= (1 << 5) | (1 << 3);
- DDRD &= ~(1 << 2);
-
- /* Set DATA line high for at least 90ns to disable /RESET functionality */
- PORTD |= (1 << 3);
- asm volatile ("NOP"::);
- asm volatile ("NOP"::);
-
- /* Set up the synchronous USART for XMEGA communications -
- 8 data bits, even parity, 2 stop bits */
- UBRR1 = (F_CPU / 1000000UL);
- UCSR1B = (1 << TXEN1);
- UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
-
- /* Send two BREAKs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
- PDITarget_SendBreak();
- PDITarget_SendBreak();
-#else
- /* Set DATA and CLOCK lines to outputs */
- BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
- BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;
-
- /* Set DATA line high for at least 90ns to disable /RESET functionality */
- BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
- asm volatile ("NOP"::);
- asm volatile ("NOP"::);
-
- /* Fire timer compare ISR every 100 cycles to manage the software USART */
- OCR1A = 80;
- TCCR1B = (1 << WGM12) | (1 << CS10);
- TIMSK1 = (1 << OCIE1A);
-
- /* Send two BREAKs of 12 bits each to enable TPI interface (need at least 16 idle bits) */
- PDITarget_SendBreak();
- PDITarget_SendBreak();
-#endif
-}
-
-/** Disables the target's PDI interface, exits programming mode and starts the target's application. */
-void PDITarget_DisableTargetPDI(void)
-{
-#if defined(PDI_VIA_HARDWARE_USART)
- /* Turn off receiver and transmitter of the USART, clear settings */
- UCSR1A |= (1 << TXC1) | (1 << RXC1);
- UCSR1B = 0;
- UCSR1C = 0;
-
- /* Set all USART lines as input, tristate */
- DDRD &= ~((1 << 5) | (1 << 3));
- PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
-#else
- /* Set DATA and CLOCK lines to inputs */
- BITBANG_PDIDATA_DDR &= ~BITBANG_PDIDATA_MASK;
- BITBANG_PDICLOCK_DDR &= ~BITBANG_PDICLOCK_MASK;
-
- /* Tristate DATA and CLOCK lines */
- BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
- BITBANG_PDICLOCK_PORT &= ~BITBANG_PDICLOCK_MASK;
-#endif
-}
-
-/** Sends a byte via the USART.
- *
- * \param[in] Byte Byte to send through the USART
- */
-void PDITarget_SendByte(const uint8_t Byte)
-{
-#if defined(PDI_VIA_HARDWARE_USART)
- /* Switch to Tx mode if currently in Rx mode */
- if (!(IsSending))
- {
- PORTD |= (1 << 3);
- DDRD |= (1 << 3);
-
- UCSR1B |= (1 << TXEN1);
- UCSR1B &= ~(1 << RXEN1);
-
- IsSending = true;
- }
-
- /* Wait until there is space in the hardware Tx buffer before writing */
- while (!(UCSR1A & (1 << UDRE1)));
- UCSR1A |= (1 << TXC1);
- UDR1 = Byte;
-#else
- /* Switch to Tx mode if currently in Rx mode */
- if (!(IsSending))
- {
- BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
- BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
-
- IsSending = true;
- }
-
- /* Calculate the new USART frame data here while while we wait for a previous byte (if any) to finish sending */
- uint16_t NewUSARTData = ((1 << 11) | (1 << 10) | (0 << 9) | ((uint16_t)Byte << 1) | (0 << 0));
-
- /* Compute Even parity - while a bit is still set, chop off lowest bit and toggle parity bit */
- uint8_t ParityData = Byte;
- while (ParityData)
- {
- NewUSARTData ^= (1 << 9);
- ParityData &= (ParityData - 1);
- }
-
- /* Wait until transmitter is idle before writing new data */
- while (SoftUSART_BitCount);
-
- /* Data shifted out LSB first, START DATA PARITY STOP STOP */
- SoftUSART_Data = NewUSARTData;
- SoftUSART_BitCount = BITS_IN_PDI_FRAME;
-#endif
-}
-
-/** Receives a byte via the software USART, blocking until data is received.
- *
- * \return Received byte from the USART
- */
-uint8_t PDITarget_ReceiveByte(void)
-{
-#if defined(PDI_VIA_HARDWARE_USART)
- /* Switch to Rx mode if currently in Tx mode */
- if (IsSending)
- {
- while (!(UCSR1A & (1 << TXC1)));
- UCSR1A |= (1 << TXC1);
-
- UCSR1B &= ~(1 << TXEN1);
- UCSR1B |= (1 << RXEN1);
-
- DDRD &= ~(1 << 3);
- PORTD &= ~(1 << 3);
-
- IsSending = false;
- }
-
- /* Wait until a byte has been received before reading */
- while (!(UCSR1A & (1 << RXC1)));
- return UDR1;
-#else
- /* Switch to Rx mode if currently in Tx mode */
- if (IsSending)
- {
- while (SoftUSART_BitCount);
-
- BITBANG_PDIDATA_DDR &= ~BITBANG_PDIDATA_MASK;
- BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
-
- IsSending = false;
- }
-
- /* Wait until a byte has been received before reading */
- SoftUSART_BitCount = BITS_IN_PDI_FRAME;
- while (SoftUSART_BitCount);
-
- /* Throw away the parity and stop bits to leave only the data (start bit is already discarded) */
- return (uint8_t)SoftUSART_Data;
-#endif
-}
-
-/** Sends a BREAK via the USART to the attached target, consisting of a full frame of idle bits. */
-void PDITarget_SendBreak(void)
-{
-#if defined(PDI_VIA_HARDWARE_USART)
- /* Switch to Tx mode if currently in Rx mode */
- if (!(IsSending))
- {
- PORTD |= (1 << 3);
- DDRD |= (1 << 3);
-
- UCSR1B &= ~(1 << RXEN1);
- UCSR1B |= (1 << TXEN1);
-
- IsSending = true;
- }
-
- /* Need to do nothing for a full frame to send a BREAK */
- for (uint8_t i = 0; i < BITS_IN_PDI_FRAME; i++)
- {
- /* Wait for a full cycle of the clock */
- while (PIND & (1 << 5));
- while (!(PIND & (1 << 5)));
- }
-#else
- /* Switch to Tx mode if currently in Rx mode */
- if (!(IsSending))
- {
- BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
- BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
-
- IsSending = true;
- }
-
- while (SoftUSART_BitCount);
-
- /* Need to do nothing for a full frame to send a BREAK */
- SoftUSART_Data = 0x0FFF;
- SoftUSART_BitCount = BITS_IN_PDI_FRAME;
-#endif
-}
-
-/** Busy-waits while the NVM controller is busy performing a NVM operation, such as a FLASH page read or CRC
- * calculation.
- *
- * \return Boolean true if the NVM controller became ready within the timeout period, false otherwise
- */
-bool PDITarget_WaitWhileNVMBusBusy(void)
-{
- TCNT0 = 0;
- TIFR0 = (1 << OCF1A);
-
- uint8_t TimeoutMS = PDI_NVM_TIMEOUT_MS;
-
- /* Poll the STATUS register to check to see if NVM access has been enabled */
- while (TimeoutMS)
- {
- /* Send the LDCS command to read the PDI STATUS register to see the NVM bus is active */
- PDITarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);
- if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
- return true;
-
- if (TIFR0 & (1 << OCF1A))
- {
- TIFR0 = (1 << OCF1A);
- TimeoutMS--;
- }
- }
-
- return false;
-}
-
-#endif
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