Posted on August 09, 2017 at 19:41Hi
First I will give info about my project.
I am generating PWM using timer, then SPI using Full Duplex slave mode and a GPIO pin.
PWM is connected to SPI sclk and GPIO is connected to NSS.
I am transferring data from 1 to 550 and 1100 to 1650. Now the problem is the first block of data i.e 1 to 550 going well. when I restart the SPI transfer I see some 2 bytes of junk data that is transferring through SPI. Below is the code and waveform.
Please suggest me and let me know where I am going wrong.
MX_GPIO_Init();
MX_DMA_Init();
MX_SPI1_Init();
MX_TIM3_Init();
/* USER CODE BEGIN 2 */
int j = 1;
for (uint16_t i = 0; i < 1100; i = i+2)
{
testDataToSend[i] = j;
testDataToSend[i+1] = j >> 8;
j++;
}
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
HAL_SPI_Transmit_DMA(&hspi1, testDataToSend, 1100);
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_4);
HAL_Delay(1);
HAL_TIM_Base_Start_IT(&htim3);
while(flag != 1){
}
flag = 0;
for (uint16_t i = 0; i < 75; i++);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
HAL_SPI_DMAStop(&hspi1);
HAL_SPI_Abort(&hspi1);
*testDataToSend = NULL;
j = 1100;
for (uint16_t i = 0; i < 1100; i = i+2)
{
testDataToSend_1[i] = j;
testDataToSend_1[i+1] = j >> 8;
j++;
}
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
HAL_SPI_Transmit_DMA(&hspi1, testDataToSend_1, 1100);
HAL_TIM_Base_Start_IT(&htim3);
while(flag != 1){
}
flag = 0;
for (uint16_t i = 0; i < 35; i++);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
*testDataToSend_1 = NULL;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
}
/* USER CODE END WHILE */
void DMA1_Channel3_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel3_IRQn 0 */
flag = 1;
/* USER CODE END DMA1_Channel3_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_spi1_tx);
/* USER CODE BEGIN DMA1_Channel3_IRQn 1 */
/* USER CODE END DMA1_Channel3_IRQn 1 */
}
void TIM3_IRQHandler(void)
{
/* USER CODE BEGIN TIM3_IRQn 0 */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_RESET);
HAL_TIM_Base_Stop_IT(&htim3);
/* USER CODE END TIM3_IRQn 0 */
HAL_TIM_IRQHandler(&htim3);
/* USER CODE BEGIN TIM3_IRQn 1 */
/* USER CODE END TIM3_IRQn 1 */
}
