Micro sec delay with STM32L0

[GErma.1]

Hi

I am using a B-L072Z-LRWAN1  development board and I need to read data from a DTH22 sensor.

I am trying to use TIM6 to get a micro second delay, but it seems I am missing something.

The delay function :

void delay (uint16_t time)

{

/* change your code here for the delay in microseconds */

__HAL_TIM_SET_COUNTER(&htim6, 0);

while ((__HAL_TIM_GET_COUNTER(&htim6))<time);

}

The TIM6 initialization:

static void MX_TIM6_Init(void)

{

 /* USER CODE BEGIN TIM6_Init 0 */

 /* USER CODE END TIM6_Init 0 */

 TIM_MasterConfigTypeDef sMasterConfig = {0};

 /* USER CODE BEGIN TIM6_Init 1 */

 /* USER CODE END TIM6_Init 1 */

 htim6.Instance = TIM6;

 htim6.Init.Prescaler = 50-1;

 htim6.Init.CounterMode = TIM_COUNTERMODE_UP;

 htim6.Init.Period = 0xffff-1;

 if (HAL_TIM_Base_Init(&htim6) != HAL_OK)

 {

  Error_Handler();

 }

 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

 if (HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig) != HAL_OK)

 {

  Error_Handler();

 }

HAL_TIM_Base_Start(&htim6);

 /* USER CODE BEGIN TIM6_Init 2 */

 /* USER CODE END TIM6_Init 2 */

}

The timer TIM6 is not counting (__HAL_TIM_GET_COUNTER(&htim6) returns alaways 0.

BR

Gilberto

[Tesla DeLorean · Accepted solution]

Need to make sure the TIM6 clock is enabled, __HAL_RCC_TIM6_CLK_ENABLE();

htim6.Init.Prescaler = 32-1; // If clocking at 32 MHz

htim6.Init.Period = 0xFFFF; // Count 0 thru 65535

The HAL_TIMEx_MasterConfigSynchronization() stuff shouldn't be necessary

[GErma.1]

Hi

The clock was not enable. It is now working perfectly.

Thanks a lot!

BR

Gilberto