STM32F7 ADC2+TIM2 CC2驱动+DMA传输，想要不停更新填充数组

啾啾啾 · 发表于 2021-10-15 10:30:39

大家好！我在测试TIM2驱动ADC2采样，DMA传输时发现，当我设定的128大小的数组被填充完毕后，就不再更新。我设想的是当数组被填满后，继续开始从数组第0位填充更新数组。请问这种想法可以实现吗，具体要如何实现？谢谢各位大佬指教！
下面是我的具体配置
ADC2+DMA：

ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc2;
ADC_ChannelConfTypeDef hadc2_channel;
void MY_ADC_Init(void)
{
__HAL_RCC_DMA2_CLK_ENABLE();
HAL_NVIC_SetPriority(DMA2_Stream2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream2_IRQn);
hdma_adc2.Instance = DMA2_Stream2;
hdma_adc2.Init.Channel = DMA_CHANNEL_1;
hdma_adc2.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc2.Init.PeriphInc = DMA_PINC_DISABLE; //???????
hdma_adc2.Init.MemInc = DMA_MINC_ENABLE; //???????
hdma_adc2.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //??????:16?
hdma_adc2.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //???????:16?
hdma_adc2.Init.Mode = DMA_CIRCULAR; //???????
hdma_adc2.Init.Priority = DMA_PRIORITY_LOW; //?????
hdma_adc2.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* ??FIFO*/
HAL_DMA_Init(&hdma_adc2);
__HAL_LINKDMA(&hadc2, DMA_Handle, hdma_adc2); //?DMA?ADC????
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4??,ADCCLK=PCLK2/4=108/4=27MHZ
hadc2.Init.Resolution = ADC_RESOLUTION_12B; //12???
hadc2.Init.ScanConvMode = DISABLE; //?????
hadc2.Init.ContinuousConvMode = DISABLE; //??????
hadc2.Init.DiscontinuousConvMode = DISABLE; //?????????
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //??????
hadc2.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //????
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT; //???
hadc2.Init.NbrOfConversion = 1; //1????????? ??????????1
hadc2.Init.DMAContinuousRequests = ENABLE; //??DMA??
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
HAL_ADC_Init(&hadc2);
hadc2_channel.Channel = ADC_CHANNEL_3; //??
hadc2_channel.Rank = 1; //??1
hadc2_channel.SamplingTime = ADC_SAMPLETIME_480CYCLES; //????
hadc2_channel.Offset = 0;
HAL_ADC_ConfigChannel(&hadc2, &hadc2_channel); //????
MY_TIM2_Init();
HAL_ADC_Start_DMA(&hadc2, (uint32_t *)buffer, sizeof(buffer));
}
//void DMA2_Stream2_IRQHandler(void)
//{
// HAL_DMA_IRQHandler(&hdma_adc2);
//}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA transfer complete\r\n");
}
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA Half transfer complete\r\n");
}
void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA transfer error\r\n");
}

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TIM2：

TIM_HandleTypeDef htim2;
TIM_OC_InitTypeDef TIM2_CH2Handler;
void MY_TIM2_Init(void)
{
__HAL_RCC_TIM2_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
htim2.Instance = TIM2;
htim2.Init.Prescaler = 10800-1;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 20000;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&htim2);
TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
TIM2_CH2Handler.Pulse = 10000;
TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_LOW;
TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&htim2, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
__HAL_TIM_ENABLE_IT(&htim2, TIM_IT_UPDATE);
TIM_CCxChannelCmd(htim2.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
__HAL_TIM_ENABLE(&htim2);
}
void TIM2_IRQHandler(void)
{
HAL_TIM_IRQHandler(&htim2);
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim == (&htim2))
{
printf("timer irq\r\n");
}
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_TIM2_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_1;
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);
}

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main.c

extern uint16_t buffer[128];
void show()
{
int i;
printf("\r\ndata:");
for (i = 0; i < 128; i++)
{
if (i % 16 == 0) printf("\r\n");
printf("%6d", buffer[i]);
//buffer[i]=0;
}
printf("\r\n");
}
int main
{
MY_ADC_Init();
}

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正点原子 · 发表于 2021-10-15 10:30:40

啾啾啾发表于 2021-10-18 16:02
好的谢谢原子哥，我想请问一下，我想对采集来的adc数据进行FFT处理，请问在DMA传输完毕中断中可以进行FFT ...

可以是可以，不过堆栈得设置很大，建议在主程序（main函数）里面做fft会好点。

正点原子 · 发表于 2021-10-16 01:08:23

开启循环模式即可

啾啾啾 · 发表于 2021-10-16 09:53:08

正点原子发表于 2021-10-16 01:08
开启循环模式即可

谢谢原子哥！我已经开启了DMA的循环模式，但是还是数组第一次填充完毕后就不再填充，串口打印了一段时间也不再打印。是不是需要设置DMA的传输完成中断？还想请问原子哥一个问题：我使用TIM2的CC2通道产生PWM波驱动ADC采样，是不是不需要开启TIM的中断？这个程序是我看别人的例程，他开启了TIM UPDATE中断。