STM32F4使用CUBEMX生成DMA模式的DAC，运行出现Hardfault

发布于 2021-11-02 22:35:47 浏览：1722 订阅该版

代码

初始化TIM6代码
```c
TIM_HandleTypeDef mytim6;
static void tim6_init(void)
{
    TIM_MasterConfigTypeDef master_config = {0};

mytim6.Instance = TIM6;
    mytim6.Init.Prescaler = 1 - 1;
    mytim6.Init.Period = 3500;
    mytim6.Init.CounterMode = TIM_COUNTERMODE_UP;
    mytim6.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
    HAL_TIM_Base_Init(&mytim6);

master_config.MasterOutputTrigger = TIM_TRGO_UPDATE;
    master_config.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    HAL_TIMEx_MasterConfigSynchronization(&mytim6, &master_config);

//HAL_TIM_Base_Start_IT(&mytim6);
}

```

初始化DAC，具体引脚，DMA模式都在MSPinit函数里
```c
DAC_HandleTypeDef *hdac1;
extern DMA_HandleTypeDef hdma_dac1;

static void dac_dma_config(void)
{
    DAC_ChannelConfTypeDef *hdacch1_cfg;
    __HAL_RCC_DMA1_CLK_ENABLE();
    HAL_NVIC_SetPriority(DMA1_Stream5_IRQn, 3, 0);
    HAL_NVIC_EnableIRQ(DMA1_Stream5_IRQn);

hdac1->Instance = DAC1;
    HAL_DAC_Init(hdac1);

hdacch1_cfg->DAC_Trigger = DAC_TRIGGER_T6_TRGO;
    hdacch1_cfg->DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
    HAL_DAC_ConfigChannel(hdac1, hdacch1_cfg, DAC_CHANNEL_1);
}
MSH_CMD_EXPORT(dac_dma_config, dac sample);
```

DMA模式，GPIO等初始化
```c
void HAL_DAC_MspInit(DAC_HandleTypeDef *hdac)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    if (hdac->Instance == DAC)
    {
        /* USER CODE BEGIN DAC_MspInit 0 */

/* USER CODE END DAC_MspInit 0 */
        /* Peripheral clock enable */
        __HAL_RCC_DAC_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();
        /**DAC GPIO Configuration
        PA4     ------> DAC_OUT1
        PA5     ------> DAC_OUT2
        */
        GPIO_InitStruct.Pin = GPIO_PIN_4 | GPIO_PIN_5;
        GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USER CODE BEGIN DAC_MspInit 1 */
        hdma_dac1.Instance = DMA1_Stream5;
        hdma_dac1.Init.Channel = DMA_CHANNEL_7;
        hdma_dac1.Init.Direction = DMA_MEMORY_TO_PERIPH;
        hdma_dac1.Init.PeriphInc = DMA_PINC_DISABLE;
        hdma_dac1.Init.MemInc = DMA_MINC_ENABLE;
        hdma_dac1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
        hdma_dac1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
        hdma_dac1.Init.Mode = DMA_CIRCULAR;
        hdma_dac1.Init.Priority = DMA_PRIORITY_HIGH;
        hdma_dac1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
        hdma_dac1.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;
        hdma_dac1.Init.MemBurst = DMA_MBURST_SINGLE;
        hdma_dac1.Init.PeriphBurst = DMA_PBURST_SINGLE;
        HAL_DMA_Init(&hdma_dac1);
        __HAL_LINKDMA(hdac, DMA_Handle1, hdma_dac1);
        /* USER CODE END DAC_MspInit 1 */
    }
}
```

以上代码基本都是CUBEMX生成后直接复制过来的
仅仅调用dac_dma_config()这个函数时就会报HardFault
![1.png](https://oss-club.rt-thread.org/uploads/20211102/8bbd24e3de15ba9db6d097cb7a2099b9.png)

通过Keil debug调试发现pc寄存器指向的地方在HAL_DAC_ConfigChannel这个函数里，我改了几下都没用，请问这到底是啥原因导致的？

还有如果这种方法确实无法使用，那么在RTThread DAC驱动中该如何修改才能使用DMA功能？仅用RTThread原有框架驱动下输出的DAC频率最高似乎只有200Hz左右