這里分享一個前一段時間寫的一個單片機(jī)程序。程序的主要功能是對鋰電池充放電模塊的鋰電池電壓和輸出電壓進(jìn)行檢測，并將檢測后的電壓用數(shù)碼管進(jìn)行顯示。

程序的主控芯片是STM8S103F3P。用的是下圖的最小系統(tǒng)板。

基本參數(shù)如下：

1、核心尺寸:8bit

2、速度:16MHz

3、連接性:12C，IrDA，LIN，SPI， UART/USART

4、外設(shè):欠壓檢測/復(fù)位，POR，PWM，WDT

5、I/0數(shù):16

6、程序存儲容量:8KB(8Kx8)

7、程序存儲器類型:閃存FLASH 可擦寫一萬次

8、EEPROM容量:640x8

9、RAM容量:1Kx8

10、電壓-電源(Vcc/Vdd): 2.95V~5.5V

11、數(shù)據(jù)轉(zhuǎn)換器:A/D 5x10b

12、振蕩器類型:內(nèi)部

13、工作溫度:-40°C~85°C(TA)

數(shù)碼管顯示部分用的是TM1637驅(qū)動的數(shù)碼管模塊。該模塊是一個12腳的帶時鐘點(diǎn)的4位共陽數(shù)碼管（0.36英寸）的顯示模塊，驅(qū)動芯片為TM1637，只需2根信號線即可使單片機(jī)控制4位8段數(shù)碼管。

模塊特點(diǎn)如下： 顯示器件為4位共陽紅字?jǐn)?shù)碼管； 數(shù)碼管8級灰度可調(diào)； 控制接口電平可為5V或3.3V； 4個M2螺絲定位孔，便于安裝。

數(shù)碼管模塊的： CLK引腳與PB4引腳相連； DIO引腳與PB5引腳相連。

由于本次使用的單片機(jī)的ADC部分為3.3V供電，而鋰電池電壓和輸出電壓都大于3.3V，所以這里通過串接電阻分壓的方式來實(shí)現(xiàn)電壓的檢測。程序中分別使用單片機(jī)ADC的通道2、通道3、通道4對輸入端電壓、鋰電池電壓及輸出端電壓進(jìn)行檢測。

程序中利用單片機(jī)的定時器4進(jìn)行采樣周期定時，采樣時間到后程序控制ADC進(jìn)行電壓采集和計算，并進(jìn)行了10次累加求平均值，最后將采集的電壓轉(zhuǎn)換為實(shí)際電壓進(jìn)行顯示。

主程序部分如下：

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/**
  ******************************************************************************
  * @file    Project/main.c 
  * @author  MCD Application Team
  * @version V2.1.0
  * @date    18-November-2011
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * 
© COPYRIGHT 2011 STMicroelectronics
  ******************************************************************************
  */ 




/* Includes ------------------------------------------------------------------*/


#include "stm8s.h"
#include "TM1637.h"
#include "math.h"


/* Private defines -----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
//#define LED_GPIO_PORT  (GPIOB)
//#define LED_GPIO_PINS  (GPIO_PIN_5)


//定時電壓結(jié)構(gòu)體
typedef struct
{
  float in_vol ;
  float out_vol ;
  float bat_vol ;
} voltage ;
uint8_t ad_buf[10] ;
uint16_t sleep_cnt = 0 ;
void Init_ADC(void)
{
        //GPIO_Init(GPIOC, GPIO_PIN_4, GPIO_MODE_IN_FL_NO_IT);
        //單次掃描模式
        /*ADC1_DeInit();
        ADC1_Init(ADC1_CONVERSIONMODE_SINGLE, ADC1_CHANNEL_2, ADC1_PRESSEL_FCPU_D2, ADC1_EXTTRIG_TIM, DISABLE, ADC1_ALIGN_RIGHT, ADC1_SCHMITTTRIG_ALL, ENABLE);
        ADC1_Cmd(ENABLE);*/
        //連續(xù)掃描模式
        ADC1_DeInit();//ADC 相關(guān)寄存器恢復(fù)默認(rèn)值
        //初始化 ADC:連續(xù)轉(zhuǎn)換/通道 8/時鐘分頻/關(guān)閉事件/數(shù)據(jù)右對齊/使能施密特觸發(fā)器
        ADC1_Init(ADC1_CONVERSIONMODE_SINGLE, ADC1_CHANNEL_5, ADC1_PRESSEL_FCPU_D2,
        ADC1_EXTTRIG_TIM, DISABLE, ADC1_ALIGN_RIGHT, ADC1_SCHMITTTRIG_ALL,ENABLE);//該處在串口發(fā)送及接收時需配置為ENABLE，否則會出現(xiàn)無法發(fā)送的現(xiàn)象。
        ADC1_ScanModeCmd(ENABLE);
        ADC1_Cmd(ENABLE);//使能 ADC
}
uint16_t i=0;
uint8_t sample_flag = 0 ;
uint8_t sample_cnt = 0 ;
voltage m_state ;
/* Private defines -----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
void Init_GPIO(void)
{
  GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_LOW_FAST);
}
void Init_Timer4(void)
{
  /*TIM4_UpdateDisableConfig(ENABLE);//允許更新事件
  TIM4_ARRPreloadConfig(ENABLE);//自動重裝
  TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);//中斷配置，更新中斷
  TIM4_SetCounter(0xff);//計數(shù)器初值
  TIM4_SetAutoreload(0xFF);//計數(shù)器自動重裝的初值
  TIM4_PrescalerConfig(TIM4_PRESCALER_128, TIM4_PSCRELOADMODE_UPDATE);//預(yù)分頻值
  */
  TIM4_TimeBaseInit(TIM4_PRESCALER_128, 0x82);
        /* Clear TIM4 update flag */
        TIM4_ClearFlag(TIM4_FLAG_UPDATE);
   /* Enable update interrupt */
  TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);
  TIM4_Cmd(ENABLE);
}






void main(void)
{
   // ErrorStatus clk_return_status;
    //FlagStatus flag_status;
    u16 u16_adc1_value1 ;
    u16 u16_adc1_value2 ;
    u16 u16_adc1_value3 ;
    u16 display_cnt = 0 ;
    float last_input = 0 ;
    float last_output = 0 ;
    /*  Configuration  -----------------------------------------*/
    CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//不分頻
    CLK_HSICmd(ENABLE);         //開始內(nèi)部高頻RC
    Init_ADC();
    Init_Timer4();
    enableInterrupts();
    GPIO_init();
    //TM1637_display(0x00,0x00,0,0x00,0x01);
    sleep_cnt = 0 ;
    while (1)
    {
      
        if(sample_flag==1)
        {
          sample_flag = 0 ;
          /* ADC1_StartConversion();
          flag_status = ADC1_GetFlagStatus(ADC1_FLAG_EOC);
          u16_adc1_value = ADC1_GetConversionValue();*/
          ADC1_StartConversion();//開啟一次轉(zhuǎn)換
          while(!ADC1_GetFlagStatus(ADC1_FLAG_EOC));//等待轉(zhuǎn)換完成
          ADC1_ClearFlag(ADC1_FLAG_EOC);//軟件清除
          u16_adc1_value1+=(u16)ADC1_GetBufferValue(ADC1_SCHMITTTRIG_CHANNEL2);//讀取AIN2的值
          u16_adc1_value2+=(u16)ADC1_GetBufferValue(ADC1_SCHMITTTRIG_CHANNEL3);//讀取AIN4的值
          u16_adc1_value3+=(u16)ADC1_GetBufferValue(ADC1_SCHMITTTRIG_CHANNEL4);//讀取AIN4的值
          sample_cnt ++ ;
          if(sample_cnt>=10)
          {
            sample_cnt = 0 ;
           
            m_state.in_vol  = (u16_adc1_value1 / 10)*0.03223*1.4545  ;
            m_state.out_vol = (u16_adc1_value2 / 10)*0.03223*3.2 ;
            m_state.bat_vol = (u16_adc1_value3 / 10)*0.03223*2 ;
            u16_adc1_value1 = 0 ;
            u16_adc1_value2 = 0 ;
            u16_adc1_value3 = 0 ;
          }
          display_cnt++;
        }
        
        if(display_cnt>999&&sleep_cnt < 10)
        {
          display_cnt=0;
          TM1637_display((int)m_state.bat_vol/10%10,(int)m_state.bat_vol%10,(int)m_state.out_vol/10%10,(int)m_state.out_vol%10,0x01);
          sleep_cnt ++ ;
        }else if(sleep_cnt>=9)
        {
          
          if(((last_output-m_state.out_vol)>0.5)||((m_state.in_vol-last_input)>0.8))
          {
            sleep_cnt = 0 ;
          }
          last_input = m_state.in_vol ;
          last_output = m_state.out_vol ;
          TM1637_display(21,21,21,21,0);
        }
         
    }
  
}


#ifdef USE_FULL_ASSERT


/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param file: pointer to the source file name
  * @param line: assert_param error line source number
  * @retval : None
  */
void assert_failed(u8* file, u32 line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d
", file, line) */


  /* Infinite loop */
  while (1)
  {
  }
}
#endif


/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

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審核編輯：劉清