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STMH743，使用DMA传输PWM，初始化和DMA1 访问的地址都没有错。我使用的是normal模式，若一直循环使用DMA是可以的，但是不能加延时，也不可以改不变发送数组的值，如果改变或者加延时函数就没有信号了。初始化代码和主函数代码如下。
初始化：
TIM_HandleTypeDef htim2;
DMA_HandleTypeDef hdma_tim2_ch2;
DMA_HandleTypeDef hdma_tim2_ch3;
/* TIM2 init function */
void MX_TIM2_Init(void)
{
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 249;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
HAL_TIM_MspPostInit(&htim2);
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* tim_pwmHandle)
{
if(tim_pwmHandle->Instance==TIM2)
{
/* TIM2 clock enable */
__HAL_RCC_TIM2_CLK_ENABLE();
/* TIM2 DMA Init */
/* TIM2_CH2 Init */
hdma_tim2_ch2.Instance = DMA1_Stream0;
hdma_tim2_ch2.Init.Request = DMA_REQUEST_TIM2_CH2;
hdma_tim2_ch2.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim2_ch2.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim2_ch2.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim2_ch2.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim2_ch2.Init.MemDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim2_ch2.Init.Mode = DMA_NORMAL;
hdma_tim2_ch2.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_tim2_ch2.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_tim2_ch2) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(tim_pwmHandle,hdma[TIM_DMA_ID_CC2],hdma_tim2_ch2);
/* TIM2_CH3 Init */
hdma_tim2_ch3.Instance = DMA1_Stream1;
hdma_tim2_ch3.Init.Request = DMA_REQUEST_TIM2_CH3;
hdma_tim2_ch3.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim2_ch3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim2_ch3.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim2_ch3.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim2_ch3.Init.MemDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim2_ch3.Init.Mode = DMA_NORMAL;
hdma_tim2_ch3.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_tim2_ch3.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_tim2_ch3) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(tim_pwmHandle,hdma[TIM_DMA_ID_CC3],hdma_tim2_ch3);
}
}
void HAL_TIM_MspPostInit(TIM_HandleTypeDef* timHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(timHandle->Instance==TIM2)
{
__HAL_RCC_GPIOA_CLK_ENABLE();
/**TIM2 GPIO Configuration
PA1 ------> TIM2_CH2
PA2 ------> TIM2_CH3
*/
GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
}
void HAL_TIM_PWM_MspDeInit(TIM_HandleTypeDef* tim_pwmHandle)
{
if(tim_pwmHandle->Instance==TIM2)
{
__HAL_RCC_TIM2_CLK_DISABLE();
HAL_DMA_DeInit(tim_pwmHandle->hdma[TIM_DMA_ID_CC2]);
HAL_DMA_DeInit(tim_pwmHandle->hdma[TIM_DMA_ID_CC3]);
}
}
主函数代码：
uint32_t M_Pix[24]__attribute__((section(".ARM.__at_0x24000000")))={249,244,240,230,220,210,200,190,180,170,160,150,140,130,120,110,100,90,80,70,60,50,40,30};
int main(void)
{
Cache_Enable();
SystemClock_Config();
HAL_Init();
MPU_Init();
MX_GPIO_Init();
while (1)
{
HAL_TIM_PWM_Start_DMA(&htim2, TIM_CHANNEL_3, (uint32_t *)M_Pix, 23);
if(__HAL_DMA_GET_FLAG(&htim2,DMA_FLAG_TCIF1_5))
{
__HAL_DMA_CLEAR_FLAG(&htim2,DMA_FLAG_TCIF1_5);
HAL_TIM_PWM_Stop_DMA(&htim2, TIM_CHANNEL_3);
}
HAL_Delay(1000);
}
}
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发表于 2020-11-25 18:12:17
楼主
发表于 2020-11-26 09:18:36
