Posted on June 15, 2018 at 10:09I am trying to interface an I2C OLED display with an STM32L053C8 board. However, instead of using STM32CubeMX to initialize my different pins, I had to manually assign them, because the example programs which come along with the board, do not open on CubeMX. I think I have made some error in the initialization. When I run the program in the initialization of the oled( i.e SSD1306_Init() ) part, when it checks whether the device is ready, i.e
if (HAL_I2C_IsDeviceReady(&hi2c1, SSD1306_I2C_ADDR, 1, 20000) != HAL_OK)
it goes into this particular function and gets stuck in an infinite while loop. The part which causes it to get stuck is highlighted in the code.
((HAL_GetTick() - tickstart) > Timeout)) never satisfies.
If someone tells me what I have done wrong, it would be of great help.
HAL_StatusTypeDef HAL_I2C_IsDeviceReady(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint32_t Trials, uint32_t Timeout)
{
uint32_t tickstart = 0U;
__IO uint32_t I2C_Trials = 0U;
if (hi2c->State == HAL_I2C_STATE_READY)
{
if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) == SET)
{
return HAL_BUSY;
}
/* Process Locked */
__HAL_LOCK(hi2c);
hi2c->State = HAL_I2C_STATE_BUSY;
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
do
{
/* Generate Start */
hi2c->Instance->CR2 = I2C_GENERATE_START(hi2c->Init.AddressingMode, DevAddress);
/* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
/* Wait until STOPF flag is set or a NACK flag is set*/
tickstart = HAL_GetTick();
while ((__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_STOPF) == RESET) && (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == RESET) && (hi2c->State != HAL_I2C_STATE_TIMEOUT))
{
if (Timeout != HAL_MAX_DELAY)
{
if ((Timeout == 0U) ||
((HAL_GetTick() - tickstart) > Timeout)) {
/* Device is ready */
hi2c->State = HAL_I2C_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_TIMEOUT;
}
}
}
