stm32f4 ADC采样频率是多少？-第7页回答

1楼-- · 2019-07-24 16:02

请教大神一个问题：如何在STM32F4中使用中断来写ADC函数，我写的程序不知道哪里有问题求指教
#include "adc.h"
#include "delay.h"
#include "led.h"

u32 ADCvalue = 0;

void ADCInitial(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
//GPIO_InitStructure.GPIO_OType =
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv =
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1,&ADC_InitStructure);

ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//3￠êÔ»»2»í¬μÄCycle
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_Cmd(ADC1,ENABLE);
ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);

ADC_RegularChannelConfig(ADC1,ADC_Channel_5,1,ADC_SampleTime_480Cycles);//3￠êÔ»»2»í¬μÄCycle
ADC_SoftwareStartConv(ADC1);

NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_Init(&NVIC_InitStructure);
}

void ADC_IRQHandler(void)
{
u32 tempValue = 0;
if(ADC_GetITStatus(ADC1,ADC_IT_EOC) == SET)
{
tempValue = ADC_GetConversionValue(ADC1);
delay_ms(5);
}
ADCvalue = tempValue;
delay_ms(200);
ADC_ClearITPendingBit(ADC1,ADC_IT_EOC);
}