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/* Copyright 2018 Jack Humbert |
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* Copyright 2018 Yiancar |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/* This library is only valid for STM32 processors. |
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* This library follows the convention of the AVR i2c_master library. |
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* As a result addresses are expected to be already shifted (addr << 1). |
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* I2CD1 is the default driver which corresponds to pins B6 and B7. This |
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* can be changed. |
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* Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that |
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* STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used |
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* but using any other I2C pins should be trivial. |
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*/ |
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#include "i2c_master.h" |
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#include "quantum.h" |
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#include <string.h> |
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#include <hal.h> |
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static uint8_t i2c_address; |
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// This configures the I2C clock to 400khz assuming a 48Mhz clock |
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// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html |
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static const I2CConfig i2cconfig = { |
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STM32_TIMINGR_PRESC(0x00U) | |
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STM32_TIMINGR_SCLDEL(0x03U) | STM32_TIMINGR_SDADEL(0x01U) | |
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STM32_TIMINGR_SCLH(0x03U) | STM32_TIMINGR_SCLL(0x09U), |
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0, |
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0 |
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}; |
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static i2c_status_t chibios_to_qmk(const msg_t status) { |
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switch (status) { |
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case I2C_NO_ERROR: |
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return I2C_STATUS_SUCCESS; |
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case I2C_TIMEOUT: |
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return I2C_STATUS_TIMEOUT; |
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// I2C_BUS_ERROR, I2C_ARBITRATION_LOST, I2C_ACK_FAILURE, I2C_OVERRUN, I2C_PEC_ERROR, I2C_SMB_ALERT |
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default: |
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return I2C_STATUS_ERROR; |
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} |
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} |
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__attribute__ ((weak)) |
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void i2c_init(void) |
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{ |
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// Try releasing special pins for a short time |
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palSetPadMode(GPIOB, 6, PAL_MODE_INPUT); |
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palSetPadMode(GPIOB, 7, PAL_MODE_INPUT); |
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chThdSleepMilliseconds(10); |
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palSetPadMode(GPIOB, 6, PAL_MODE_ALTERNATE(1) | PAL_STM32_OTYPE_OPENDRAIN); |
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palSetPadMode(GPIOB, 7, PAL_MODE_ALTERNATE(1) | PAL_STM32_OTYPE_OPENDRAIN); |
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//i2cInit(); //This is invoked by halInit() so no need to redo it. |
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} |
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i2c_status_t i2c_start(uint8_t address) |
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{ |
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i2c_address = address; |
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i2cStart(&I2C_DRIVER, &i2cconfig); |
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return 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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{ |
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i2c_address = address; |
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i2cStart(&I2C_DRIVER, &i2cconfig); |
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i2cAcquireBus(&I2C_DRIVER); |
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msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, 0, 0, TIME_MS2I(timeout)); |
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i2cReleaseBus(&I2C_DRIVER); |
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return chibios_to_qmk(status); |
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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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i2c_address = address; |
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i2cStart(&I2C_DRIVER, &i2cconfig); |
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msg_t status = i2cMasterReceiveTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, TIME_MS2I(timeout)); |
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return chibios_to_qmk(status); |
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} |
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i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) |
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{ |
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i2c_address = devaddr; |
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i2cStart(&I2C_DRIVER, &i2cconfig); |
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uint8_t complete_packet[length + 1]; |
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for(uint8_t i = 0; i < length; i++) |
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{ |
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complete_packet[i+1] = data[i]; |
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} |
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complete_packet[0] = regaddr; |
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msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), complete_packet, length + 1, 0, 0, TIME_MS2I(timeout)); |
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return chibios_to_qmk(status); |
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} |
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) |
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{ |
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i2c_address = devaddr; |
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i2cStart(&I2C_DRIVER, &i2cconfig); |
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msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), ®addr, 1, data, length, TIME_MS2I(timeout)); |
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return chibios_to_qmk(status); |
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} |
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void i2c_stop(void) |
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{ |
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i2cStop(&I2C_DRIVER); |
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} |