2020年02月21日 | stm32L151 tim trigger adc定时器触发单通道adc采样dma传输

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include “adc.h”

ifdef Debug

include “led.h”

include “string.h”

uint16_t tb=0; 

//char dat[512]={0,}; 

uint8_t tc=0;

endif

__IO uint16_t ADC_ConvertedValue[40];

define ADC1_DR_ADDRESS ((uint32_t)0x40012458)

static void dma_adc_init(void) 

{ 

DMA_InitTypeDef DMA_InitStructure; 

NVIC_InitTypeDef NVIC_InitStructure; 

/———————— DMA1 configuration ——————————/ 

/* Enable DMA1 clock */ 

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); 

/* DMA1 channel1 configuration */ 

DMA_DeInit(DMA1_Channel1); 

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS; 

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC_ConvertedValue; 

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; 

DMA_InitStructure.DMA_BufferSize = 40; 

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable ; 

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; 

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; 

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; 

DMA_InitStructure.DMA_Priority = DMA_Priority_High; 

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; 

DMA_Init(DMA1_Channel1, &DMA_InitStructure); 

DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE); 

DMA_ClearFlag(DMA1_FLAG_TC1); 

/* Enable DMA1 channel1 */ 

DMA_Cmd(DMA1_Channel1, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel1_IRQn; 

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 0; 

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; 

NVIC_Init(&NVIC_InitStructure);

} 

static void tim_trig_init(void) 

{ 

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);

TIM_TimeBaseStructure.TIM_ClockDivision=0;//

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_Prescaler=320;//100k

TIM_TimeBaseStructure.TIM_Period=99;//1k

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

//TIM_ITConfig(TIM2,TIM_IT_Trigger,ENABLE);

TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);

TIM_Cmd(TIM2, ENABLE);

}

void adc_init(void)//tim触发 1ms一个数据 dma数据搬运 

{ 

ADC_InitTypeDef ADC_InitStructure; 

GPIO_InitTypeDef GPIO_InitStructure; 

dma_adc_init(); 

/* Enable the HSI oscillator */ 

RCC_HSICmd(ENABLE); 

/* Check that HSI oscillator is ready */ 

while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET); 

/* Enable ADC1 clock */ 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

// RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); 

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 

//while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET); 

/* Configure PB.12 (ADC Channel18) in analog mode |GPIO_Pin_2|GPIO_Pin_3*/ 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; 

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; 

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* ADC1 configuration */ 

ADC_InitStructure.ADC_ScanConvMode = DISABLE; 

ADC_InitStructure.ADC_ContinuousConvMode =DISABLE; 

ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; 

ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T2_TRGO ; 

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; 

ADC_InitStructure.ADC_NbrOfConversion = 1; 

ADC_Init(ADC1, &ADC_InitStructure); 

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_4Cycles); 

//ADC_InjectedChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_4Cycles); 

//ADC_InjectedChannelConfig(ADC1, ADC_Channel_13, 2, ADC_SampleTime_4Cycles); 

//ADC_InjectedChannelConfig(ADC1, ADC_Channel_Vrefint, 3, ADC_SampleTime_4Cycles); 

//ADC_ExternalTrigInjectedConvEdgeConfig(ADC1,ADC_ExternalTrigConvEdge_Rising);

//ADC_ExternalTrigInjectedConvConfig(ADC1,ADC_ExternalTrigInjecConv_T2_TRGO);

ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); 

//ADC_ExternalTrigConvCmd(ADC1, ENABLE);

ADC_DMACmd(ADC1,ENABLE); 

ADC_Cmd(ADC1, ENABLE); 

/* Wait until the ADC1 is ready */ 

while(ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET){} 

ADC_SoftwareStartConv(ADC1);

tim_trig_init(); 

} 

uint8_t check_dma_tc() 

{ 

return tc;

} 

void clear_dma_tc(){ 

tc=0; 

} 

uint16_t send2m(char *ptr,uint16_t d[]) 

{ 

char buf[10]; 

uint16_t l=0,i; 

for(i=0;i<40-1;i++) 

{ 

l=l+sprintf(buf,”%d,”,d[i]); 

ptr=strcat(ptr,buf); 

} 

l=l+sprintf(buf,”%d”,d[39]); 

ptr=strcat(ptr,buf); 

return l;

} 

void DMA1_Channel1_IRQHandler(void) 

{ 

uint16_t i=0; 

if(DMA_GetITStatus(DMA1_IT_TC1)) 

{ 

DMA_ClearFlag(DMA1_FLAG_TC1); 

#ifdef Debug 

tb++; 

if(tb>5) 

{ 

GPIO_ToggleBits(led_port,led_pin); 

tb=0;

    }

    tc=1;

 #endif

}

}

adc采集到50Hz信号数据（叠加在直流上），发送到PC，利用python对数据进行处理显示： 

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