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/* Copyright 2018 Jack Humbert
* Copyright 2018 Yiancar
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* This library is only valid for STM32 processors.
* This library follows the convention of the AVR i2c_master library.
* As a result addresses are expected to be already shifted (addr << 1).
* I2CD1 is the default driver which corresponds to pins B6 and B7. This
* can be changed.
* Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
* STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used
* but using any other I2C pins should be trivial.
*/
#include "quantum.h"
#include "i2c_master.h"
#include <string.h>
#include <hal.h>
static const I2CConfig i2cconfig = {
#ifdef USE_I2CV1
I2C1_OPMODE,
I2C1_CLOCK_SPEED,
I2C1_DUTY_CYCLE,
#else
// This configures the I2C clock to 400khz assuming a 72Mhz clock
// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
STM32_TIMINGR_PRESC(I2C1_TIMINGR_PRESC) | STM32_TIMINGR_SCLDEL(I2C1_TIMINGR_SCLDEL) | STM32_TIMINGR_SDADEL(I2C1_TIMINGR_SDADEL) | STM32_TIMINGR_SCLH(I2C1_TIMINGR_SCLH) | STM32_TIMINGR_SCLL(I2C1_TIMINGR_SCLL), 0, 0
#endif
};
static i2c_status_t chibios_to_qmk(const msg_t* status) {
switch (*status) {
case I2C_NO_ERROR:
return I2C_STATUS_SUCCESS;
case I2C_TIMEOUT:
return I2C_STATUS_TIMEOUT;
// I2C_BUS_ERROR, I2C_ARBITRATION_LOST, I2C_ACK_FAILURE, I2C_OVERRUN, I2C_PEC_ERROR, I2C_SMB_ALERT
default:
return I2C_STATUS_ERROR;
}
}
__attribute__((weak)) void i2c_init(void) {
// Try releasing special pins for a short time
palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_INPUT);
palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_INPUT);
chThdSleepMilliseconds(10);
#if defined(USE_GPIOV1)
palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
#else
palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_ALTERNATE(I2C1_SCL_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_ALTERNATE(I2C1_SDA_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
#endif
}
i2c_status_t i2c_start(uint8_t address) {
#if I2C_USE_MUTUAL_EXCLUSION
i2cAcquireBus(&I2C_DRIVER);
#endif
i2cStart(&I2C_DRIVER, &i2cconfig);
return I2C_STATUS_SUCCESS;
}
i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) {
#if I2C_USE_MUTUAL_EXCLUSION
i2cAcquireBus(&I2C_DRIVER);
#endif
i2cStart(&I2C_DRIVER, &i2cconfig);
msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (address >> 1), data, length, 0, 0, MS2ST(timeout));
#if I2C_USE_MUTUAL_EXCLUSION
i2cReleaseBus(&I2C_DRIVER);
#endif
return chibios_to_qmk(&status);
}
i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) {
#if I2C_USE_MUTUAL_EXCLUSION
i2cAcquireBus(&I2C_DRIVER);
#endif
i2cStart(&I2C_DRIVER, &i2cconfig);
msg_t status = i2cMasterReceiveTimeout(&I2C_DRIVER, (address >> 1), data, length, MS2ST(timeout));
#if I2C_USE_MUTUAL_EXCLUSION
i2cReleaseBus(&I2C_DRIVER);
#endif
return chibios_to_qmk(&status);
}
i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
#if I2C_USE_MUTUAL_EXCLUSION
i2cAcquireBus(&I2C_DRIVER);
#endif
i2cStart(&I2C_DRIVER, &i2cconfig);
uint8_t complete_packet[length + 1];
for (uint8_t i = 0; i < length; i++) {
complete_packet[i + 1] = data[i];
}
complete_packet[0] = regaddr;
msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (devaddr >> 1), complete_packet, length + 1, 0, 0, MS2ST(timeout));
#if I2C_USE_MUTUAL_EXCLUSION
i2cReleaseBus(&I2C_DRIVER);
#endif
return chibios_to_qmk(&status);
}
i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
#if I2C_USE_MUTUAL_EXCLUSION
i2cAcquireBus(&I2C_DRIVER);
#endif
i2cStart(&I2C_DRIVER, &i2cconfig);
msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (devaddr >> 1), ®addr, 1, data, length, MS2ST(timeout));
#if I2C_USE_MUTUAL_EXCLUSION
i2cReleaseBus(&I2C_DRIVER);
#endif
return chibios_to_qmk(&status);
}
void i2c_stop(void) {
i2cStop(&I2C_DRIVER);
#if I2C_USE_MUTUAL_EXCLUSION
i2cReleaseBus(&I2C_DRIVER);
#endif
}
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