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ADC_RegularChannelConfig(ADC1,ADC_Channel_1 , 1, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1,ADC_Channel_2 , 2, ADC_SampleTime_239Cycles5 );
void DMA1_Channel1_IRQHandler(void)
{
if( DMA_GetITStatus(DMA1_IT_TC1) != RESET)
{
voltage[0] = (float)ADC_Soure[0] * (3.3/4096.0);
voltage[1] = (float)ADC_Soure[1] * (3.3/4096.0);
DMA_ClearITPendingBit(DMA1_IT_TC1);
}
}
#ifndef _ADC_H
#define _ADC_H
/*************************************
* 文件名 ：main.c
* 描述 ：串口1(USART1)向電腦的超級(jí)終端以1s為間隔打印當(dāng)前ADC1的轉(zhuǎn)換電壓值
* 實(shí)驗(yàn)平臺(tái)：MINI STM32開(kāi)發(fā)板 基于STM32F103C8T6
* 庫(kù)版本 ：ST3.0.0
**********************************************************************************/
#include "stm32f10x.h"
#include "stdio.h"
extern __IO u16 ADC_ConvertedValue[2];//ADC1轉(zhuǎn)換的電壓值通過(guò)DMA方式傳到SRAM
float ADC_ConvertedValueLoacl[2];//用于保存轉(zhuǎn)換計(jì)算后的電壓值
// 軟件延時(shí)
#define ADC1_DR_Address ((u32)0x4001244C)
/*配置采樣通道端口 使能GPIO時(shí)鐘 設(shè)置ADC采樣PA0端口信號(hào)*/
#define Res1 4700 //4.7K
#define BValue 3435 //10K
float Rt,Temperature,Voltage;
void ADC1_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //GPIO設(shè)置為模擬輸入
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*配置ADC1的工作模式為MDA模式 */
void ADC1_Mode_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能MDA1時(shí)鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1時(shí)鐘
/* DMA channel1 configuration */
DMA_DeInit(DMA1_Channel1); //指定DMA通道
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;//設(shè)置DMA外設(shè)地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue; //設(shè)置DMA內(nèi)存地址，ADC轉(zhuǎn)換結(jié)果直接放入該地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外設(shè)為設(shè)置為數(shù)據(jù)傳輸?shù)膩?lái)源
DMA_InitStructure.DMA_BufferSize = 2; //DMA緩沖區(qū)設(shè)置為1；
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);
/* Enable DMA channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE); //使能DMA通道
/* ADC1 configuration */
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //使用獨(dú)立模式，掃描模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //無(wú)需外接觸發(fā)器
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//使用數(shù)據(jù)右對(duì)齊
ADC_InitStructure.ADC_NbrOfChannel = 2; // 只有1個(gè)轉(zhuǎn)換通道
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel11 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5); //通道0采樣周期55.5個(gè)時(shí)鐘周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5); //通道0采樣周期55.5個(gè)時(shí)鐘周期
ADC_TempSensorVrefintCmd(ENABLE);//開(kāi)啟溫度控制寄存器
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE); //使能ADC的DMA
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE); //使能ADC1
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1); //使能復(fù)位校準(zhǔn)
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));//等待復(fù)位校準(zhǔn)結(jié)束
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);//開(kāi)啟AD校準(zhǔn)
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //開(kāi)始轉(zhuǎn)換
}
/*初始化ADC1 */
void ADC1_Init(void)
{
ADC1_GPIO_Config();
ADC1_Mode_Config();
}
void Delay(unsigned long time)
{
unsigned long i,j;
for(j=0; j<time; j++)
{
for(i=0;i<12000;i++);
}
}
void USART1_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* 使能 USART1 時(shí)鐘*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
/* USART1 使用IO端口配置 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA
/* USART1 工作模式配置 */
USART_InitStructure.USART_BaudRate =115200; //波特率設(shè)置：115200
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數(shù)據(jù)位數(shù)設(shè)置：8位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位設(shè)置：1位
USART_InitStructure.USART_Parity = USART_Parity_No ; //是否奇偶校驗(yàn)：無(wú)
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制模式設(shè)置：沒(méi)有使能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//接收與發(fā)送都使能
USART_Init(USART1, &USART_InitStructure); //初始化USART1
USART_Cmd(USART1, ENABLE);// USART1使能
}
/* 描述 ：重定向c庫(kù)函數(shù)printf到USART1*/
int fputc(int ch, FILE *f)
{
/* 將Printf內(nèi)容發(fā)往串口 */
USART_SendData(USART1, (unsigned char) ch);
while (!(USART1->SR & USART_FLAG_TXE));
return (ch);
}
int main(void)
{
// u32 AD_value;
u32 i,ADC;
/* 配置系統(tǒng)時(shí)鐘為72M */
// SystemInit();
/* 配置串口 */
ADC1_Init();
USART1_Config();
/* 初始化ADC1 */
// printf("");//打印電壓值初始化不能關(guān)閉
while (1)
{
ADC_ConvertedValueLoacl[0]=（float）ADC_ConvertedValue[0]/4096*3.3;
ADC_ConvertedValueLoacl[1]=（float）ADC_ConvertedValue[1]/4096*3.3;
printf("ADC0 = %fv\r\n", ADC_ConvertedValueLoacl[0]);
// AD_value = 3300000/4096*ADC_ConvertedValue/1000;
ADC=0;
for(i=0;i<50;i++)
{
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //開(kāi)始轉(zhuǎn)換
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));//等待轉(zhuǎn)換結(jié)束標(biāo)志位
ADC=ADC+ADC_GetConversionValue(ADC1);//返回最近一次 ADCx 規(guī)則組的轉(zhuǎn)換結(jié)果
}
ADC=ADC/50;
printf("溫度 = %f℃\r\n",(1.43-3.3/4095*ADC)/0.0043+25);
// printf("ADC = %fv\r\n", ADC*3.3/4095);
Delay(3000);//延時(shí)不低于1s
}
}
#endif
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