forked from forks/qmk_firmware
ad2bb529c7
* Addition of I2C master driver for STM32, Generalization of ISSI3731 driver - Addition of an i2c_master driver for STM32 to replicate expectations of AVR driver. - Moved ISSI3731 driver one level up to make it accesible by both architectures. - Renamed ISSI3731 functions to a more general name for preparation of other ISSI drivers. - Added compiler directives where necessary to differenciate each architecture. * converted tabs to spaces
104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/* 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 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.
|
|
*/
|
|
|
|
#include "i2c_master.h"
|
|
#include <string.h>
|
|
#include <hal.h>
|
|
|
|
static uint8_t i2c_address;
|
|
|
|
// This configures the I2C clock to 400Mhz assuming a 72Mhz clock
|
|
// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
|
|
static const I2CConfig i2cconfig = {
|
|
STM32_TIMINGR_PRESC(15U) |
|
|
STM32_TIMINGR_SCLDEL(4U) | STM32_TIMINGR_SDADEL(2U) |
|
|
STM32_TIMINGR_SCLH(15U) | STM32_TIMINGR_SCLL(21U),
|
|
0,
|
|
0
|
|
};
|
|
|
|
void i2c_init(void)
|
|
{
|
|
palSetGroupMode(GPIOB,6,7, PAL_MODE_INPUT); // Try releasing special pins for a short time
|
|
chThdSleepMilliseconds(10);
|
|
|
|
palSetPadMode(GPIOB, 6, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_PUPDR_PULLUP);
|
|
palSetPadMode(GPIOB, 7, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_PUPDR_PULLUP);
|
|
|
|
//i2cInit(); //This is invoked by halInit() so no need to redo it.
|
|
}
|
|
|
|
// This is usually not needed
|
|
uint8_t i2c_start(uint8_t address)
|
|
{
|
|
i2c_address = address;
|
|
i2cStart(&I2C_DRIVER, &i2cconfig);
|
|
return 0;
|
|
}
|
|
|
|
uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
|
|
{
|
|
i2c_address = address;
|
|
i2cStart(&I2C_DRIVER, &i2cconfig);
|
|
return i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, 0, 0, MS2ST(timeout));
|
|
}
|
|
|
|
uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
|
|
{
|
|
i2c_address = address;
|
|
i2cStart(&I2C_DRIVER, &i2cconfig);
|
|
return i2cMasterReceiveTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, MS2ST(timeout));
|
|
}
|
|
|
|
uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
|
|
{
|
|
i2c_address = devaddr;
|
|
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
|
|
|
|
return i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), complete_packet, length + 1, 0, 0, MS2ST(timeout));
|
|
}
|
|
|
|
uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
|
|
{
|
|
i2c_address = devaddr;
|
|
i2cStart(&I2C_DRIVER, &i2cconfig);
|
|
return i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), regaddr, 1, data, length, MS2ST(timeout));
|
|
}
|
|
|
|
// This is usually not needed. It releases the driver to allow pins to become GPIO again.
|
|
uint8_t i2c_stop(uint16_t timeout)
|
|
{
|
|
i2c_address = address;
|
|
i2cStop(&I2C_DRIVER);
|
|
return 0;
|
|
}
|