Im trying to reduce power by putting the a STM32l031 to sleep between timer interupts. It goes to sleep but never wakes up
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim) {
if (htim -> Instance == TIM21) {
Strobe++;
if (Strobe==8352){
Strobe=0;
HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, GPIO_PIN_SET);
}
}
HAL_PWR_EnableSleepOnExit ();
HAL_SuspendTick();
}
static void MX_TIM21_Init(void)
{
/* USER CODE BEGIN TIM21_Init 0 */
/* USER CODE END TIM21_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
/* USER CODE BEGIN TIM21_Init 1 */
/*
* htim21.Init.Prescaler = 320;
* htim21.Init.Period = 248;
*/
/* USER CODE END TIM21_Init 1 */
htim21.Instance = TIM21;
htim21.Init.Prescaler = 0;
htim21.Init.CounterMode = TIM_COUNTERMODE_UP;
htim21.Init.Period = 3333;
htim21.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim21.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim21) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim21, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim21, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM21_Init 2 */
/* USER CODE END TIM21_Init 2 */
}
