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cpu/stm32f1: Add remap support for stm32f1 cpus and boards

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This commit fixes configuration problems when trying to use i2c pins that need to be remapped.
All B8 and B9 pins for STM32F1 need to be remapped, so a check is done if the remappable pins are selected.
This commit is contained in:
MrKevinWeiss 2018-12-07 16:30:54 +01:00
parent e0997b4fc7
commit d7eb070eb4
3 changed files with 12 additions and 2 deletions
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3
boards/common/stm32f103c8/include/periph_conf.h
View File

@ -155,7 +155,8 @@ static const uart_conf_t uart_config[] = {
/** @} */
/**
* @name I2C configuration
* @name I2C configuration
* @note This board may require external pullup resistors for i2c operation.
* @{
*/
static const i2c_conf_t i2c_config[] = {

3
boards/nucleo-f103rb/include/periph_conf.h
View File

@ -144,7 +144,8 @@ static const uart_conf_t uart_config[] = {
/** @} */
/**
* @name I2C configuration
* @name I2C configuration
* @note This board may require external pullup resistors for i2c operation.
* @{
*/
static const i2c_conf_t i2c_config[] = {

8
cpu/stm32_common/periph/i2c_2.c
View File

@ -109,6 +109,14 @@ void i2c_init(i2c_t dev)
gpio_init(i2c_config[dev].scl_pin, GPIO_OD_PU);
gpio_init(i2c_config[dev].sda_pin, GPIO_OD_PU);
#ifdef CPU_FAM_STM32F1
/* This is needed in case the remapped pins are used */
if (i2c_config[dev].scl_pin == GPIO_PIN(PORT_B, 8) ||
i2c_config[dev].sda_pin == GPIO_PIN(PORT_B, 9)) {
/* The remapping periph clock must first be enabled */
RCC->APB2ENR |= RCC_APB2ENR_AFIOEN;
/* Then the remap can occur */
AFIO->MAPR |= AFIO_MAPR_I2C1_REMAP;
}
gpio_init_af(i2c_config[dev].scl_pin, GPIO_AF_OUT_OD);
gpio_init_af(i2c_config[dev].sda_pin, GPIO_AF_OUT_OD);
#else