STM32G474RE，DAC3无法通过DMA传输数据
实验平台：Nucleo-STM32G474RE开发板验证功能：希望利用DMA把数据传到DAC3的DAC_DHR12R1寄存器产生波形，再通过运放的跟随输出到外部管脚
问题描述：DMA没有更新DAC3的DHR12R1寄存器数据，进而无波形产生
DAC3配置：
static void MX_DAC3_Init(void)
{
/* USER CODE BEGIN DAC3_Init 0 */
/* USER CODE END DAC3_Init 0 */
DAC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN DAC3_Init 1 */
/* USER CODE END DAC3_Init 1 */
/** DAC Initialization
*/
hdac3.Instance = DAC3;
if (HAL_DAC_Init(&hdac3) != HAL_OK)
{
Error_Handler();
}
/** DAC channel OUT1 config
*/
sConfig.DAC_HighFrequency = DAC_HIGH_FREQUENCY_INTERFACE_MODE_AUTOMATIC;
sConfig.DAC_DMADoubleDataMode = DISABLE;
sConfig.DAC_SignedFormat = DISABLE;
sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
sConfig.DAC_Trigger = DAC_TRIGGER_T2_TRGO;
sConfig.DAC_Trigger2 = DAC_TRIGGER_NONE;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
if (HAL_DAC_ConfigChannel(&hdac3, &sConfig, DAC_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN DAC3_Init 2 */
/* USER CODE END DAC3_Init 2 */
}
OPAMP1配置
static void MX_OPAMP1_Init(void)
{
/* USER CODE BEGIN OPAMP1_Init 0 */
/* USER CODE END OPAMP1_Init 0 */
/* USER CODE BEGIN OPAMP1_Init 1 */
/* USER CODE END OPAMP1_Init 1 */
hopamp1.Instance = OPAMP1;
hopamp1.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
hopamp1.Init.Mode = OPAMP_FOLLOWER_MODE;
hopamp1.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_DAC;
hopamp1.Init.InternalOutput = DISABLE;
hopamp1.Init.TimerControlledMuxmode = OPAMP_TIMERCONTROLLEDMUXMODE_DISABLE;
hopamp1.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
if (HAL_OPAMP_Init(&hopamp1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN OPAMP1_Init 2 */
/* USER CODE END OPAMP1_Init 2 */
}
TIMER2配置：
static void MX_TIM2_Init(void)
{
/* USER CODE BEGIN TIM2_Init 0 */
/* USER CODE END TIM2_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {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 = 169;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
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 */
}
DMA配置：
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMAMUX1_CLK_ENABLE();
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}
主程序：
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_DAC3_Init();
MX_OPAMP1_Init();
MX_TIM2_Init();
/* USER CODE BEGIN 2 */
for (i=0;i<NUM;i++)
{
sinetable=(uint16_t)((pow(2,12)-1)*(sin((double)i/NUM*2*Pi)));
}
HAL_OPAMP_Start(&hopamp1);
HAL_TIM_Base_Start(&htim2);
HAL_DAC_Start_DMA(&hdac3,DAC_CHANNEL_1,(uint32_t *)sinetable,NUM,DAC_ALIGN_12B_R);
问题：无波形产生，但是用软件设定值的话，可以观察到输出电压有反应，可以定位于DAC的DMA模式不工作，进而调试发现初始化的时候DMA1的EN可以使能，接着程序跑起来后EN一直就为0，如果强制把EN置1，则过后软件马上把EN清0，同时DMA的ISR寄存器中的TEIF1和GIF1被置1，说明有传输错误。请问是DMA哪里配置有问题，忽视了什么吗？谢谢
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
这句改成 DAC_OUTPUTBUFFER_ENABLE 试试 mikecai 发表于 2019-11-8 17:31
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
这句改成 DAC_OUTPUTBUFFER_ENABLE 试试
谢谢您的回复，可能您不熟悉STM32G4的芯片，DAC3输出不能达到管脚，只有内部连接，如果要输出来，只能从内部接到运放的非反相端，按照跟随器的方式输出，所以这里只能这样的配置
页:
[1]