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標題: stm32f1多通道ADC采集 [打印本頁]

作者: 曹操我孫子 時間: 2018-12-24 13:48
標題: stm32f1多通道ADC采集
多通道AD采集， TIM上升沿觸發，DMA傳送
#include "adc.h"
uint16_t ADC_DATA[ADC_CHANNEL_NUM]={0};
uint8_t send_buf[10]={0};

volatile float adc1 = 0;
volatile float adc2 = 0;
volatile float adc3 = 0;
void adc_config(u32 Period,u32 TIM_Prescaler)
{
/***********************TIM--PWM上升沿觸發************************************************/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStructure;
NVIC_InitTypeDef  NVIC_InitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period=Period;
TIM_TimeBaseInitStructure.TIM_Prescaler=TIM_Prescaler;
TIM_TimeBaseInitStructure.TIM_RepetitionCounter=0;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set;
TIM_OC2Init(TIM2, & TIM_OCInitStructure);
// TIM_CtrlPWMOutputs(TIM2, ENABLE);
// TIM_InternalClockConfig(TIM2);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM2,ENABLE);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
/*****************************TIM2_中斷**********************************************/
NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStructure);
/***********************GPIO**********************************************/
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitTypeDef GPIOB_InitStructure;
ADC_InitTypeDef    ADC_InitStructure;
DMA_InitTypeDef  DMA_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOB,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIOB_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIOB_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
GPIOB_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIOB_InitStructure);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
/***********************DMA**********************************************/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_MemoryBaseAddr=(u32)& ADC_DATA;
DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_BufferSize=ADC_CHANNEL_NUM;
DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;
DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;
DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&(ADC1->DR);
DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority=DMA_Priority_VeryHigh;
DMA_Init(DMA1_Channel1,&DMA_InitStructure);
DMA_Cmd(DMA1_Channel1,ENABLE);
DMA_ClearITPendingBit(DMA1_IT_TC1);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/****************************ADC****************************************/
ADC_DeInit(ADC1);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode =ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = ADC_CHANNEL_NUM;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, 4, 1, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, 5, 2, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, 8, 3, ADC_SampleTime_239Cycles5);
ADC_DMACmd(ADC1,ENABLE);
TIM_Cmd(TIM2, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
ADC_ExternalTrigConvCmd(ADC1, ENABLE);
}
void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)
{
adc1=(ADC_DATA[0]*3.3/4096);
//adc1=(ADC_DATA[0]);
adc2=(ADC_DATA[1]*3.3/4096);
adc3=(ADC_DATA[2]*3.3/4096);
}
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}
void DMA1_Channel1_IRQHandler()
{

if(DMA_GetITStatus(DMA1_IT_TC1))
{
      DMA_ClearITPendingBit(DMA1_IT_GL1);
}
}

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