142 lines
6.3 KiB
C
142 lines
6.3 KiB
C
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// Copyright 2025 QMK
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <stdint.h>
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/**
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* \file
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*
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* \defgroup i2c_master I2C Master API
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*
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* \brief API to communicate with I2C devices.
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* \{
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*/
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typedef int16_t i2c_status_t;
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#define I2C_STATUS_SUCCESS (0)
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#define I2C_STATUS_ERROR (-1)
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#define I2C_STATUS_TIMEOUT (-2)
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#define I2C_TIMEOUT_IMMEDIATE (0)
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#define I2C_TIMEOUT_INFINITE (0xFFFF)
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/**
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* \brief Initialize the I2C driver. This function must be called only once, before any of the below functions can be called.
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*
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* This function is weakly defined, meaning it can be overridden if necessary for your particular use case.
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*/
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void i2c_init(void);
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/**
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* \brief Send multiple bytes to the selected I2C device.
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*
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* \param address The 7-bit I2C address of the device.
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* \param data A pointer to the data to transmit.
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* \param length The number of bytes to write. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
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#if defined(__AVR__) || defined(__DOXYGEN__)
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/**
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* \brief Send multiple bytes from PROGMEM to the selected I2C device.
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*
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* On ARM devices, this function is simply an alias for i2c_transmit(address, data, length, timeout).
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*
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* \param address The 7-bit I2C address of the device.
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* \param data A pointer to the data to transmit.
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* \param length The number of bytes to write. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_transmit_P(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
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#else
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# define i2c_transmit_P(address, data, length, timeout) i2c_transmit(address, data, length, timeout)
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#endif
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/**
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* \brief Receive multiple bytes from the selected I2C device.
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*
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* \param address The 7-bit I2C address of the device.
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* \param data A pointer to a buffer to read into.
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* \param length The number of bytes to read. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
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/**
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* \brief Write to a register with an 8-bit address on the I2C device.
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*
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* \param devaddr The 7-bit I2C address of the device.
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* \param regaddr The register address to write to.
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* \param data A pointer to the data to transmit.
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* \param length The number of bytes to write. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_write_register(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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/**
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* \brief Write to a register with a 16-bit address (big endian) on the I2C device.
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*
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* \param devaddr The 7-bit I2C address of the device.
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* \param regaddr The register address to write to.
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* \param data A pointer to the data to transmit.
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* \param length The number of bytes to write. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_write_register16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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/**
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* \brief Read from a register with an 8-bit address on the I2C device.
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*
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* \param devaddr The 7-bit I2C address of the device.
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* \param regaddr The register address to read from.
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* \param data A pointer to a buffer to read into.
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* \param length The number of bytes to read. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_read_register(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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/**
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* \brief Read from a register with a 16-bit address (big endian) on the I2C device.
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*
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* \param devaddr The 7-bit I2C address of the device.
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* \param regaddr The register address to read from.
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* \param data A pointer to a buffer to read into.
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* \param length The number of bytes to read. Take care not to overrun the length of `data`.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_read_register16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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/**
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* \brief Ping the I2C bus for a specific address.
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*
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* On ChibiOS a "best effort" attempt is made by reading a single byte from register 0 at the given address. This should generally work except for I2C devices that do not not respond to a register 0 read request, which will result in a false negative result (unsuccessful response to ping attempt).
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*
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* This function is weakly defined, meaning it can be overridden if necessary for your particular use case.
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*
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* \param address The 7-bit I2C address of the device.
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* \param timeout The time in milliseconds to wait for a response from the target device.
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*
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* \return `I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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*/
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i2c_status_t i2c_ping_address(uint8_t address, uint16_t timeout);
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/** \} */
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