stm32学习之十

USART,AD与GPIO的温度传感器:

留意的是:

1、ADC_RegularChannelConfig(ADC1,ADC_Channel_16,1,ADC_SampleTime_239Cycles5);

2、ADC_TempSensorVrefintCmd(ENABLE);

依照上一节的程序，能够改写以下，构成现在的程序与作用:

add.h和add.h（写成这种方法，原因与上一节相同）

add.h的代码:

#ifndef _ADD_H
#define _ADD_H

#include “stm32f10x.h”
//关于12位的ADC，3.3V的ADC值为0xfff,温度为25度时对应的电压值为1.43V即0x6EE
#define V25 0x6EE

//斜率 每摄氏度4.3mV 对应每摄氏度0x05
#define AVG_SLOPE 0x05
void ADC_Configure();

#endif

add.c的代码如下:

#include “add.h”
#define ADC1_DR_Address ((u32)0x40012400 + 0x4C)

__IO uint16_t ADC_ConvertedValue;

static void ADC_GPIO_Config()
{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 ,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_ADC1,ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_Init(GPIOC,&GPIO_InitStructure);

}
static void ADC_DMA_Config()
{
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryInc= DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_PeripheralInc= DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_Init(DMA1_Channel1,&DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1,&ADC_InitStructure);

RCC_ADCCLKConfig(RCC_PCLK2_Div8);
ADC_RegularChannelConfig(ADC1,ADC_Channel_16,1,ADC_SampleTime_239Cycles5);

ADC_TempSensorVrefintCmd(ENABLE);

ADC_DMACmd(ADC1,ENABLE);
ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);
}

void ADC_Configure()
{
ADC_GPIO_Config();
ADC_DMA_Config();
}

usart.h的代码:

#ifndef _USART_H
#define _USAET_H
#include
void Usart_GPIO_Config(void);
int fputc(int ch,FILE *f);

#endif

usart.c的代码:

#include “usart.h”
#include “stm32f10x.h”

void Usart_GPIO_Config()
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_10;
GPIO_Init(GPIOA,&GPIO_InitStructure); //留意的是，这个必须得加上，原因不清

USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1,&USART_InitStructure);
USART_Cmd(USART1,ENABLE);
}

int fputc(int ch,FILE *f)
{
USART_SendData(USART1,(unsigned char)ch);
while(!(USART1->SR & USART_FLAG_TXE));
return ch;
}

main.c的代码如下:

/******************** (C) COPYRIGHT 2013 **************************
* 文件名 ：main.c
* 描绘 ：用3.5.0版别建的工程模板。
* 试验渠道：野火STM32开发板
* 库版别 ：ST3.5.0
*
* 作者 ：wit_yuan
* 时刻 : 2013年4月29日
* 版别 ：v1.0
**********************************************************************************/
#include “stm32f10x.h”
#include “add.h”
#include “usart.h”
void delay(__IO uint32_t count);

extern __IO uint16_t ADC_ConvertedValue;

u16 Current_Temp;

/*
* 函数名：main
* 描绘 : 主函数
* 输入 ：无
* 输出 : 无
*/
int main(void)
{
Usart_GPIO_Config();
ADC_Configure();

while(1)
{
Current_Temp=(V25-ADC_ConvertedValue)/AVG_SLOPE+25;

//10进制显现
printf(“\r\n The current temperature= %3d ℃\r\n”, Current_Temp);
delay(0x01fffff0);

}
// add your code here ^_^。
}
/******************* (C) COPYRIGHT 2013 *****END OF FILE************/
void delay(__IO uint32_t count)
{
for(;count>0;count–);
}

构成的作用如下：