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Handle I2C scan with specific call to HAL_I2C_IsDeviceReady #301

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Merged
merged 1 commit into from
Sep 4, 2018
Merged

Handle I2C scan with specific call to HAL_I2C_IsDeviceReady #301

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20 changes: 18 additions & 2 deletions cores/arduino/stm32/twi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -355,6 +355,11 @@ i2c_status_e i2c_master_write(i2c_t *obj, uint8_t dev_address,
uint32_t tickstart = HAL_GetTick();
uint32_t delta = 0;

/* When size is 0, this is usually an I2C scan / ping to check if device is there and ready */
if (size == 0) {
return i2c_IsDeviceReady(obj, dev_address, 1);
}

do{
if(HAL_I2C_Master_Transmit_IT(&(obj->handle), dev_address, data, size) == HAL_OK){
ret = I2C_OK;
Expand Down Expand Up @@ -447,8 +452,19 @@ i2c_status_e i2c_IsDeviceReady(i2c_t *obj, uint8_t devAddr, uint32_t trials)
{
i2c_status_e ret = HAL_OK;

if(HAL_I2C_IsDeviceReady( &(obj->handle), devAddr, trials, I2C_TIMEOUT_TICK) != HAL_OK) {
ret = I2C_BUSY;
switch (HAL_I2C_IsDeviceReady( &(obj->handle), devAddr, trials, I2C_TIMEOUT_TICK)) {
case HAL_OK:
ret = HAL_OK;
break;
case HAL_TIMEOUT:
ret = I2C_TIMEOUT;
break;
case HAL_BUSY:
ret = I2C_BUSY;
break;
default:
ret = I2C_TIMEOUT;
break;
}

return ret;
Expand Down