Question
DMA for Quadtrature Encoder not working (stm32g0x1)
I am working with a Quadrature Encoder that uses TIM2 (encoder mode). The encoder mode automatically captures an increase in the register htim2.Instance->CNT
I am trying to use DMA to fill a buffer with the CNT values however it does not seem to work.
I would really appreciate any help!
My relevant code:
initializations:
TIM_HandleTypeDef htim2;
TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim16;
DMA_HandleTypeDef hdma_tim16_com;
int32_t count_buf[COUNT_BUF_CAPACITY];
main:
MX_DMA_Init();
MX_TIM2_Init();
MX_TIM16_Init();
HAL_TIM_Base_Start_IT(&htim16);
HAL_TIM_Encoder_Start_IT(&htim2, TIM_CHANNEL_ALL);
HAL_DMA_Start(&hdma_tim16_com,&htim2.Instance->CNT,count_buf,4);
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA2_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn);
}
static void MX_TIM16_Init(void)
{
/* USER CODE BEGIN TIM16_Init 0 */
/* USER CODE END TIM16_Init 0 */
/* USER CODE BEGIN TIM16_Init 1 */
/* USER CODE END TIM16_Init 1 */
htim16.Instance = TIM16;
htim16.Init.Prescaler = 63;
htim16.Init.CounterMode = TIM_COUNTERMODE_UP;
htim16.Init.Period = 99;
htim16.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim16.Init.RepetitionCounter = 0;
htim16.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim16) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM16_Init 2 */
/* USER CODE END TIM16_Init 2 */
}
static void MX_TIM2_Init(void)
{
/* USER CODE BEGIN TIM2_Init 0 */
/* USER CODE END TIM2_Init 0 */
TIM_Encoder_InitTypeDef sConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
/* USER CODE BEGIN TIM2_Init 1 */
/* USER CODE END TIM2_Init 1 */
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 4294967295;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
sConfig.EncoderMode = TIM_ENCODERMODE_TI12;
sConfig.IC1Polarity = TIM_ICPOLARITY_RISING;
sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC1Prescaler = TIM_ICPSC_DIV1;
sConfig.IC1Filter = 0;
sConfig.IC2Polarity = TIM_ICPOLARITY_RISING;
sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC2Prescaler = TIM_ICPSC_DIV1;
sConfig.IC2Filter = 0;
if (HAL_TIM_Encoder_Init(&htim2, &sConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM2_Init 2 */
/* USER CODE END TIM2_Init 2 */
}