* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-/* This library follows the convention of the AVR i2c_master library.
+/* 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.
+ * 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 "i2c_master.h"
+#include "quantum.h"
#include <string.h>
#include <hal.h>
static uint8_t i2c_address;
-// This configures the I2C clock to 400Mhz assuming a 72Mhz clock
+// This configures the I2C clock to 400khz 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) |
0
};
+__attribute__ ((weak))
void i2c_init(void)
{
- palSetGroupMode(GPIOB,6,7, PAL_MODE_INPUT); // Try releasing special pins for a short time
+ // Try releasing special pins for a short time
+ palSetPadMode(I2C1_BANK, I2C1_SCL, PAL_MODE_INPUT);
+ palSetPadMode(I2C1_BANK, I2C1_SDA, PAL_MODE_INPUT);
+
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);
+ palSetPadMode(I2C1_BANK, I2C1_SCL, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN);
+ palSetPadMode(I2C1_BANK, I2C1_SDA, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN);
//i2cInit(); //This is invoked by halInit() so no need to redo it.
}
uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
{
+ // FIXME: Next steps: Add a print here, copy this file to your rgb_matrix firmware. Compare both.
i2c_address = address;
i2cStart(&I2C_DRIVER, &i2cconfig);
return i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, 0, 0, MS2ST(timeout));
{
complete_packet[i+1] = data[i];
}
- complete_packet[0] = regaddr
+ 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)
+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);
// 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;
}