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STM32: I2C: Reset I2C in case of errors to recover 

This is to avoid an IP / bus deadlock.

This requires to store scl and sda in order to call the init function.
pull/3238/head
Laurent MEUNIER 2016-10-27 17:30:40 +02:00
parent 42d89b0665
commit ec95aa5701
2 changed files with 7 additions and 4 deletions
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2
targets/TARGET_STM/TARGET_STM32F4/common_objects.h
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@ -91,6 +91,8 @@ struct i2c_s {
I2CName i2c;
I2C_HandleTypeDef handle;
uint8_t index;
PinName sda;
PinName scl;
IRQn_Type event_i2cIRQ;
IRQn_Type error_i2cIRQ;
volatile uint8_t event;

9
targets/TARGET_STM/TARGET_STM32F4/i2c_api.c
View File

@ -174,6 +174,8 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
// Determine the I2C to use
I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
obj_s->sda = sda;
obj_s->scl = scl;
obj_s->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
MBED_ASSERT(obj_s->i2c != (I2CName)NC);
@ -710,12 +712,11 @@ void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c){
/* Get object ptr based on handler ptr */
i2c_t *obj = get_i2c_obj(hi2c);
struct i2c_s *obj_s = I2C_S(obj);
I2C_HandleTypeDef *handle = &(obj_s->handle);
/* Disable IT. Not always done before calling macro */
__HAL_I2C_DISABLE_IT(handle, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);
/* re-init IP to try and get back in a working state */
i2c_init(obj, obj_s->sda, obj_s->scl);
/* Set event flag */
/* Keep Set event flag */
obj_s->event = I2C_EVENT_ERROR;
}