求助一个基于HAL库的PWM+DMA的例程代码，一直弄不出来啊。...
我用Cube生成的代码，单纯PWM是可以的。但不知道为什么PWM加上DMA后完全没用，不可控。谁能发个例程给我，或者帮我检查一下我这里例程那里出问题了吗？谢谢了。STM32F030芯片，代码几乎都是用Cube生成的，除了main函数上的几行代码。int main(void)
{
/* USER CODE BEGIN 1 */
uint16_t i;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_TIM3_Init();
MX_DMA_Init();
/* USER CODE BEGIN 2 */
//HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_3);
for(i = 0; i < SEND_SIZE; i++)
{
pwm_buf = 200;
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_3, (uint32_t *)(&(pwm_buf)), SEND_SIZE*2);
HAL_Delay(200);
}
/* USER CODE END 3 */
}static void MX_TIM3_Init(void)
{
/* USER CODE BEGIN TIM3_Init 0 */
/* USER CODE END TIM3_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
/* USER CODE BEGIN TIM3_Init 1 */
/* USER CODE END TIM3_Init 1 */
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 10000;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 2;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
__HAL_TIM_DISABLE_OCxPRELOAD(&htim3, TIM_CHANNEL_3);
/* USER CODE BEGIN TIM3_Init 2 */
/* USER CODE END TIM3_Init 2 */
HAL_TIM_MspPostInit(&htim3);
}static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel2_3_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
}void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM3)
{
/* USER CODE BEGIN TIM3_MspInit 0 */
/* USER CODE END TIM3_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_TIM3_CLK_ENABLE();
/* TIM3 DMA Init */
/* TIM3_CH3 Init */
hdma_tim3_ch3.Instance = DMA1_Channel2;
hdma_tim3_ch3.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim3_ch3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim3_ch3.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim3_ch3.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_tim3_ch3.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_tim3_ch3.Init.Mode = DMA_CIRCULAR;
hdma_tim3_ch3.Init.Priority = DMA_PRIORITY_VERY_HIGH;
if (HAL_DMA_Init(&hdma_tim3_ch3) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(htim_base,hdma,hdma_tim3_ch3);
/* USER CODE BEGIN TIM3_MspInit 1 */
/* USER CODE END TIM3_MspInit 1 */
}
}
建议你检查一下那个DMA使能函数的参数。另外在C:\project_32\STM32Cube_FW_F1_V1.7.0\Projects\STM3210E_EVAL\Examples\TIM\TIM_DMA有个例程可以参考一下
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