STM32F103RC dac输出使能后系统调度异常是什么原因导致的？

硬件为stm32f103rct6 使用dac1（PA4）输出正弦波，波形正常但系统调度异常，msh无法输入输出，不再执行每秒一次的rt_kprintf("flag main \n")，（此时依然在正常输出正弦波），调用main中for循环前的语句1或语句2任一语句任务调度即可恢复正常，rtt版本为3.1.5 做过如下尝试

1.降低DMA触发定时器TIM2的频率。没有效果。

2.换TIM6触发。依然不行

请教一下大家可能会是什么原因导致的？

main中配置如下：

int main(void)

{

rt_uint32_t re_mcp = 0;

fal_init();

FlashPartition = fal_partition_find("app");

if (NULL == FlashPartition)

{

rt_kprintf("Can't find %s Fal partition!\n","app");

return RT_ERROR;

}

bsp_InitUart();

bsp_InitLed();

OsTaskCreate();

spi_init();//softspi初始化

/ dac 相关配置和初始化 /

DacGpioInit();

DacDmaInit();

MX_TIM2_Init();

DacInit();

//HAL_TIM_Base_Stop(&htim2); //语句1

//HAL_DAC_Stop_DMA(&hdac,DAC_CHANNEL_1);//语句2

for(;;)

{

rt_kprintf("flag main \n");

rt_thread_mdelay(1000);

}

return RT_EOK;

}

void DacGpioInit()

{

__HAL_RCC_GPIOD_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();

}

void DacDmaInit()

{

/* DMA controller clock enable */

__HAL_RCC_DMA2_CLK_ENABLE();

/* DMA interrupt init */

/* DMA2_Channel3_IRQn interrupt configuration */

HAL_NVIC_SetPriority(DMA2_Channel3_IRQn, 0, 0);

HAL_NVIC_EnableIRQ(DMA2_Channel3_IRQn);

}

void DacInit()

{

uint32_t Idx; //定义变量 dac用

DAC_ChannelConfTypeDef sConfig = {0};

hdac.Instance = DAC;

if (HAL_DAC_Init(&hdac) != HAL_OK)

{

Error_Handler();

}

/* * DAC channel OUT1 config

*/

sConfig.DAC_Trigger = DAC_TRIGGER_T2_TRGO;//DAC_TRIGGER_T2_TRGO;

sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;

if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)

{

Error_Handler();

}

for (Idx = 0; Idx <100; Idx++)

{

DualSine12bit[Idx] = (Sine12bit[Idx] << 16)+ (Sine12bit[Idx]);

}

HAL_TIM_Base_Start(&htim2);

HAL_DAC_Start_DMA(&hdac,DAC_CHANNEL_1,(uint32_t *)DualSine12bit,100,DAC_ALIGN_12B_R);

}

void MX_TIM2_Init(void)

{

TIM_ClockConfigTypeDef sClockSourceConfig = {0};

TIM_MasterConfigTypeDef sMasterConfig = {0};

htim2.Instance = TIM2;

htim2.Init.Prescaler = 72;

htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

htim2.Init.Period = 100;

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();

}

}