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Diffstat (limited to 'watch-library/shared/watch/watch_i2c.h')
-rw-r--r-- | watch-library/shared/watch/watch_i2c.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/watch-library/shared/watch/watch_i2c.h b/watch-library/shared/watch/watch_i2c.h new file mode 100644 index 00000000..fbcc1a92 --- /dev/null +++ b/watch-library/shared/watch/watch_i2c.h @@ -0,0 +1,106 @@ +/* + * MIT License + * + * Copyright (c) 2020 Joey Castillo + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#ifndef _WATCH_I2C_H_INCLUDED +#define _WATCH_I2C_H_INCLUDED +////< @file watch_i2c.h + +#include "watch.h" + +/** @addtogroup i2c I2C Controller Driver + * @brief This section covers functions related to the SAM L22's built-I2C driver, including + * configuring the I2C bus, putting values directly on the bus and reading data from + * registers on I2C devices. + */ +/// @{ +/** @brief Enables the I2C peripheral. Call this before attempting to interface with I2C devices. + */ +void watch_enable_i2c(void); + +/** @brief Disables the I2C peripheral. + */ +void watch_disable_i2c(void); + +/** @brief Sends a series of values to a device on the I2C bus. + * @param addr The address of the device you wish to talk to. + * @param buf A series of unsigned bytes; the data you wish to transmit. + * @param length The number of bytes in buf that you wish to send. + */ +void watch_i2c_send(int16_t addr, uint8_t *buf, uint16_t length); + +/** @brief Receives a series of values from a device on the I2C bus. + * @param addr The address of the device you wish to hear from. + * @param buf Storage for the incoming bytes; on return, it will contain the received data. + * @param length The number of bytes that you wish to receive. + */ +void watch_i2c_receive(int16_t addr, uint8_t *buf, uint16_t length); + +/** @brief Writes a byte to a register in an I2C device. + * @param addr The address of the device you wish to address. + * @param reg The register on the device that you wish to set. + * @param data The value that you wish to set the register to. + */ +void watch_i2c_write8(int16_t addr, uint8_t reg, uint8_t data); + +/** @brief Reads a byte from a register in an I2C device. + * @param addr The address of the device you wish to address. + * @param reg The register on the device that you wish to read. + * @return An unsigned byte representing the value of the register that was read. + */ +uint8_t watch_i2c_read8(int16_t addr, uint8_t reg); + +/** @brief Reads an unsigned little-endian word from a register in an I2C device. + * @param addr The address of the device you wish to address. + * @param reg The register on the device that you wish to read. + * @return An unsigned word representing the value of the register that was read. + * @note This reads two bytes into the word in bus order. If the device returns + the LSB first and then the MSB, you can use this value as returned. + If the device returns the data in big-endian order or uses some other + kind of fancy bit packing, you may need to shuffle some bits around. + */ +uint16_t watch_i2c_read16(int16_t addr, uint8_t reg); + +/** @brief Reads three bytes as an unsigned little-endian int from a register in an I2C device. + * @param addr The address of the device you wish to address. + * @param reg The register on the device that you wish to read. + * @return An unsigned word representing the value of the register that was read. + * @note This reads three bytes into the word in bus order. If the device returns + these bytes LSB first, you can use this value as returned. If there is a + sign bit, the device returns the data in big-endian order, or it uses some + other kind of fancy bit packing, you may need to shuffle some bits around. + */ +uint32_t watch_i2c_read24(int16_t addr, uint8_t reg); + + +/** @brief Reads an unsigned little-endian int from a register in an I2C device. + * @param addr The address of the device you wish to address. + * @param reg The register on the device that you wish to read. + * @return An unsigned word representing the value of the register that was read. + * @note This reads three bytes into the word in bus order. If the device returns + these bytes LSB first, you can use this value as returned. If the device + returns the data in big-endian order, or it uses some other kind of fancy + bit packing, you may need to shuffle some bits around. + */ +uint32_t watch_i2c_read32(int16_t addr, uint8_t reg); +/// @} +#endif |