一 STC32G单片机内置ADC模块简介

STC32G单片机内部集成了一个12位高速ADC转换器，ADC的最高时钟频率为系统频率的1/2。其输入通道多达15个（第15通道为专门测量内部1.19V参考信号源的通道），可分时切换使用。

STC15系列单片机内置ADC模块以电源电源作为ADC参考电压，STC32G的ADC模块则与之不同，它有单独的参考电压源引脚，可以接入精准的参考电压（0~5V皆可），以获得稳定的ADC值；参考电源引脚也可直接与MCU供电电源连接，不过AD转换结果可能会收到电源电源波动的影响。注意：STC32GADC模块的参考电压输入引脚不可悬空。

STC32G单片机的内置ADC模块转换结果存储在两个8位寄存器中，可配置为左对齐（高8位存储在高位寄存器ADC_RES中，低四位存储在低位寄存器ADC_REL的高四位中），可配置为右对齐（高4位存储在高位寄存器ADC_RES的低4位中，低8位存储在低位寄存器ADC_REL中）。

二 STC32G单片机内置ADC模块的相关寄存器

STC32G单片机内置ADC模块的相关寄存器包含控制寄存器ADC_CONTR、转换结果高位寄存器ADC_RES、转换结果低位寄存器ADC_RESL、配置寄存器ADCCFG、时序控制寄存器ADCTIM。下面是STC用户手册对这几个寄存器的功能介绍。

寄存器ADC_CONTR

配置寄存器ADCCFG

时序控制寄存器ADCTIM

三 ADC模块函数库编程

ADC模块应用离不开相关寄存器编程，先将常用的寄存器配置操作编写成库函数供以后调用。

头文件

/*STC32G_ADC.hDesigned by Bill LiuVersion 0.0 Modified last by Bill Liu,7/21/2022
/enum//
STC32G_ADC_CHN         //STC32G ADC channel
STC32G_ADC_SPEED       //STC32G ADC clock frequency/Macro function
STC32G_ADCPOWERON();                //adc power on
STC32G_ADCPOWEROFF();             //adc power off
STC32G_ADCSTART();          //adc start
STC32G_ADCSTOP();                     //adc stop
STC32G_ADCCLEARFLAG():      //clear flag
STC32G_ADCPWMTRIENBLE();    //PWM trigger adc enable
STC32G_ADCPWMTRIDISBLE();       //PWM trigger adc disableSTC32G_ADCSELCH0();                //selected ADC_CH0
STC32G_ADCSELCH1();               //selected ADC_CH1
STC32G_ADCSELCH2();             //selected ADC_CH2
STC32G_ADCSELCH3();         //selected ADC_CH3
STC32G_ADCSELCH4();             //selected ADC_CH4
STC32G_ADCSELCH5();         //selected ADC_CH5
STC32G_ADCSELCH6();             //selected ADC_CH6
STC32G_ADCSELCH7();         //selected ADC_CH7
STC32G_ADCSELCH8();         //selected ADC_CH8
STC32G_ADCSELCH9();         //selected ADC_CH9
STC32G_ADCSELCH10();        //selected ADC_CH10
STC32G_ADCSELCH11();        //selected ADC_CH11
STC32G_ADCSELCH12();        //selected ADC_CH12
STC32G_ADCSELCH13();        //selected ADC_CH13
STC32G_ADCSELCH14();        //selected ADC_CH14
STC32G_ADCSELCH15();                //selected ADC_CH15 at inner band gap voltageSTC32G_ADCRESLALIG();              //adc result left alignment
STC32G_ADCRESRALIG():           //adc result right alignment//fuanction/
STC32G_AdcSelChn(STC32G_ADC_CHN chn);                          //return void
STC32G_AdcSelSpeed(STC32G_ADC_SPEED selSpeed);         //return void
STC32G_AdcStructInitDef(STC32G_ADC_TypeDef* pStruct);  //return void
STC32G_AdcInit(STC32G_ADC_TypeDef mStruct);                      //return void
STC32G_AdcGetRes(ui16* pResult);                                             //return ui16
*/#ifndef   __STC32G_ADC_H
#define __STC32G_ADC_H#include  "config.h"
#include  "STC32G_GPIO.h"#define STC32G_ADCPOWERON()          {ADC_POWER = 1;}               //adc power on
#define STC32G_ADCPOWEROFF()                 {ADC_POWER = 0;}                //adc power off
#define STC32G_ADCSTART()            {ADC_START = 1;}         //adc start
#define STC32G_ADCSTOP()             {ADC_START = 0;}                  //adc stop
#define STC32G_ADCCLEARFLAG()        {ADC_FLAG = 0;}           //clear flag
#define STC32G_ADCPWMTRIENBLe()      {ADC_EPWMT = 1;}         //PWM trigger adc enable
#define STC32G_ADCPWMTRIDISBLE()     {ADC_EPWMT = 0;}                  //PWM trigger adc disable#define  STC32G_ADCSELCH0()   {STC32G_P1MODE_HIIN(PIN0); ADC_CONTR &= 0xF0;}                                           //selected ADC_CH0
#define  STC32G_ADCSELCH1()   {STC32G_P1MODE_HIIN(PIN1); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x01;}   //selected ADC_CH1
#define  STC32G_ADCSELCH2()   {STC32G_P1MODE_HIIN(PIN2); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x02;}   //selected ADC_CH2
#define  STC32G_ADCSELCH3()   {STC32G_P1MODE_HIIN(PIN3); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x03;}   //selected ADC_CH3
#define  STC32G_ADCSELCH4()   {STC32G_P1MODE_HIIN(PIN4); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x04;}   //selected ADC_CH4
#define  STC32G_ADCSELCH5()   {STC32G_P1MODE_HIIN(PIN5); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x05;}   //selected ADC_CH5
#define  STC32G_ADCSELCH6()   {STC32G_P1MODE_HIIN(PIN6); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x06;}   //selected ADC_CH6
#define  STC32G_ADCSELCH7()   {STC32G_P1MODE_HIIN(PIN7); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x07;}   //selected ADC_CH7
#define  STC32G_ADCSELCH8()   {STC32G_P0MODE_HIIN(PIN0); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x08;}   //selected ADC_CH8
#define  STC32G_ADCSELCH9()   {STC32G_P0MODE_HIIN(PIN1); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x09;}   //selected ADC_CH9
#define  STC32G_ADCSELCH10()  {STC32G_P0MODE_HIIN(PIN2); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x10;}   //selected ADC_CH10
#define  STC32G_ADCSELCH11()  {STC32G_P0MODE_HIIN(PIN3); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x11;}   //selected ADC_CH11
#define  STC32G_ADCSELCH12()  {STC32G_P0MODE_HIIN(PIN4); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x12;}   //selected ADC_CH12
#define  STC32G_ADCSELCH13()  {STC32G_P0MODE_HIIN(PIN5); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x13;}   //selected ADC_CH13
#define  STC32G_ADCSELCH14()  {STC32G_P0MODE_HIIN(PIN6); ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x14;}   //selected ADC_CH14
#define  STC32G_ADCSELCH15()  { ADC_CONTR &= 0xF0;  ADC_CONTR |= 0x15;}                                                            //selected  band gap voltage#define STC32G_ADCRESLALIG()  {RESFMT = 0;} //adc result left alignment
#define STC32G_ADCRESRALIG()  {RESFMT = 1;} //adc result right alignment//******************************************************
typedef enum
{ADC_CH0 = 0,  //ADC channel 0 at P10ADC_CH1,          //ADC channel 1 at P11ADC_CH2,          //ADC channel 2 at P54ADC_CH3,          //ADC channel 3 at P13ADC_CH4,          //ADC channel 4 at P14ADC_CH5,          //ADC channel 5 at P15ADC_CH6,          //ADC channel 6 at P16ADC_CH7,          //ADC channel 7 at P17ADC_CH8,          //ADC channel 8 at P00ADC_CH9,          //ADC channel 9 at P01ADC_CH10,         //ADC channel 10 at P02ADC_CH11,        //ADC channel 11 at P03ADC_CH12,        //ADC channel 12 at P04ADC_CH13,        //ADC channel 13 at P05ADC_CH14,        //ADC channel 14 at P06ADC_CH15,        //ADC channel 15 at inner band gap voltage
}STC32G_ADC_CHN; //STC32G ADC channel//******************************************************
typedef enum
{FOSC_DIV_2X1 = 0,  // FOSC / (2 * 1)FOSC_DIV_2X2,      // FOSC / (2 * 2)FOSC_DIV_2X3,      // FOSC / (2 * 3)FOSC_DIV_2X4,      // FOSC / (2 * 4)FOSC_DIV_2X5,      // FOSC / (2 * 5)FOSC_DIV_2X6,      // FOSC / (2 * 6)FOSC_DIV_2X7,      // FOSC / (2 * 7)FOSC_DIV_2X8,      // FOSC / (2 * 8)FOSC_DIV_2X9,      // FOSC / (2 * 9)FOSC_DIV_2X10,     // FOSC / (2 * 10)FOSC_DIV_2X11,     // FOSC / (2 * 11)FOSC_DIV_2X12,     // FOSC / (2 * 12)FOSC_DIV_2X13,     // FOSC / (2 * 13)FOSC_DIV_2X14,     // FOSC / (2 * 14)FOSC_DIV_2X15,     // FOSC / (2 * 15)FOSC_DIV_2X16,     // FOSC / (2 * 16)
}STC32G_ADC_SPEED; //STC32G ADC clock frequency//******************************************************
typedef struct
{BOOL adcPowerOn;                               //ADC power on enable/disable, 0-disable, 1-enable  STC32G_ADC_CHN adcChn;             //slected adc channelBOOL pwmTrigAble;STC32G_ADC_SPEED adcSpeed;         //STC32G_ADC_SPEEDBOOL  adcResultRA;                            //adc result_data style,0:left alignment(default), 1:right alignmentBOOL    adcSetupTime;                                   //ADC channel select setup time control congigure, 0: 1 system clock cycles(default), 1: 2 system clock cyclesu8    adcHoldTime;                                    //ADC channel select hold time control congigure.  0: 1 ADC clock cycle time, 1:2 ADC clock cycle timesu8   adcSampleTime;                              //analog signal sampling control time. 10 min. recommended 0x1F}STC32G_ADC_TypeDef;/******************************************************
Function: STC32G_AdcSelChn(STC32G_ADC_CHN chn);
return value: void
chn:adc channel
description: select adc channel
Example:STC32G_AdcSelChn(ADC_CH0);
******************************************************/
void STC32G_AdcSelChn(STC32G_ADC_CHN chn);/******************************************************
Function: STC32G_AdcSelSpeed(STC32G_ADC_SPEED selSpeed);
return value: void
selSpeed:selected speed
description: configure adc speed
Example:STC32G_AdcSelSpeed(FOSC_DIV_2X16);
******************************************************/
void STC32G_AdcSelSpeed(STC32G_ADC_SPEED selSpeed);/******************************************************
Function: STC32G_AdcInitDef(STC32G_ADC_TypeDef* pStruct);
return value: void
pStruct: STC32G_ADC_TypeDef struct address to be inited to default
description: Init STC32G_ADC_TypeDef struct to default value
Example:STC32G_ADC_TypeDef mStruct;STC32G_AdcInitDef(&mStruct);
******************************************************/
void STC32G_AdcInitDef(STC32G_ADC_TypeDef* pStruct);/******************************************************
Function: STC32G_AdcInit(STC32G_ADC_TypeDef mStruct);
return value: void
mStruct: configure STC32G by mStruct
description: init adc
Example:STC32G_ADC_TypeDef mStruct;STC32G_AdcInit(mStruct);
******************************************************/
void STC32G_AdcInit(STC32G_ADC_TypeDef mStruct);/******************************************************
Function: STC32G_AdcGetRes(ui16* pResult);
return value: ui16
pResult: address to store got result
description: get adc result
Example:ui16 mReult;STC32G_AdcGetRes(&mReult);
******************************************************/
u16  STC32G_AdcGetRes(ui16* pResult);   #endif

源文件

/*STC32G_ADC.cDesigned by Bill LiuVersion 0.0 Modified last by Bill Liu, 07/21/2022
*/#include  "STC32G_ADC.h"//******************************************************
void STC32G_AdcSelChn(STC32G_ADC_CHN chn)
{switch(chn){case ADC_CH0:STC32G_ADCSELCH0()break;case ADC_CH1:STC32G_ADCSELCH1()break;case ADC_CH2:STC32G_ADCSELCH2()break;case ADC_CH3:STC32G_ADCSELCH3()break;case ADC_CH4:STC32G_ADCSELCH4()break;case ADC_CH5:STC32G_ADCSELCH5()break;case ADC_CH6:STC32G_ADCSELCH6()break;case ADC_CH7:STC32G_ADCSELCH7()break;case ADC_CH8:STC32G_ADCSELCH8()break;case ADC_CH9:STC32G_ADCSELCH9()break;case ADC_CH10:STC32G_ADCSELCH10()break;case ADC_CH11:STC32G_ADCSELCH11()break;case ADC_CH12:STC32G_ADCSELCH12()break;case ADC_CH13:STC32G_ADCSELCH13()break;case ADC_CH14:STC32G_ADCSELCH14()break;case ADC_CH15:STC32G_ADCSELCH15()break;}
}
//End of STC32G_AdcSelChn(STC32G_ADC_CHN chn)//******************************************************
void STC32G_AdcSelSpeed(STC32G_ADC_SPEED selSpeed)
{ADCCFG &= 0xF0;ADCCFG |= selSpeed;
}
//End of STC32G_AdcSelSpeed(STC32G_ADC_SPEED selSpeed)//******************************************************
void STC32G_AdcInitDef(STC32G_ADC_TypeDef* pStruct)
{pStruct -> adcPowerOn = 0;pStruct -> adcChn = ADC_CH0;pStruct -> pwmTrigAble = 0;         //PWM trigger disablepStruct -> adcSpeed = FOSC_DIV_2X1; //adc clk is sclok/2pStruct -> adcResultRA = 0;         //adc result left alignpStruct -> adcSetupTime = 0;        //Tadcsetup a adc clkpStruct -> adcHoldTime = 0x01;      //adc hold time 2 adc clkpStruct -> adcSampleTime = 0x0A;    //adc sampling time: 11 adc clk, 0x0A <= adcSampleTime <= 0x1F
}
//End of STC32G_AdcInitDef(STC32G_ADC_TypeDef* pStruct)//******************************************************
void STC32G_AdcInit(STC32G_ADC_TypeDef mStruct)
{STC32G_AdcSelChn(mStruct.adcChn);ADC_EPWMT = mStruct.pwmTrigAble;ADCCFG &= 0xF0;ADCCFG |= mStruct.adcSpeed;RESFMT = mStruct.adcResultRA;ADCTIM &= 0x7F;ADCTIM |= mStruct.adcSetupTime;ADCTIM &= 0x9F;ADCTIM |= mStruct. adcHoldTime;ADCTIM &= 0xE0;ADCTIM |= mStruct. adcSampleTime;ADC_POWER = mStruct.adcPowerOn;
}
//End of STC32G_AdcInit(STC32G_ADC_TypeDef mStruct)//******************************************************
u16  STC32G_AdcGetRes(ui16* pResult)
{*pResult = 0;STC32G_ADCSTART();_nop_();_nop_();while(!ADC_FLAG);STC32G_ADCCLEARFLAG()*pResult = ADC_RES;if(RESFMT){*pResult <<= 8;*pResult += ADC_RESL;}else{*pResult <<= 4;*pResult += ADC_RESL >> 4;}return    *pResult;
}
//End of STC32G_AdcGetRes(ui16* pResult)

四应用编程示例

下面写段示例程序，演示ADC库文件的使用。

头文件：

/*main.hDesigned by Bill LiuVersion 0.0 Modified last by Bill Liu ,04/18/2023
*/#ifndef     __MAIN_H__
#define     __MAIN_H__//#include "myport.h"
#include "mtype.h"
#include "config.h"
#include "STC32G_GPIO.h"
#include "STC32G_Delay.h"
#include "STC32G_UART.h"
//#include "STC32G_EEPROM.h"
//#include "STC32G_PWM.h"
#include "STC32G_ADC.h"
//#include "STC32G_EEPROM.H"
//#include "STC32G_SPI.h"
//#include "STC32G_PWM.h"
//#include "STC32G_Timer.h"
//#include "STC32G_comparator.h"STC32G_ADC_TypeDef mstruct;#endif

源文件：

/*main.cDesigned by Bill LiuVersion 0.0 Modified last by Bill Liu, 03/25/2023
*/#include "main.h"ui8 str[30] = {0};
ui16 ADCRes = 0;
f32 TestVoltage = 0;void main()
{SysInit();Uart1_Init(VBAUD_8BITS,G1, 0, 9600);STC32G_AdcInitDef(&mstruct);mstruct.adcPowerOn = 1;mstruct.adcChn = ADC_CH0;mstruct.pwmTrigAble = 0;mstruct.adcSpeed = FOSC_DIV_2X16;mstruct.adcHoldTime = 0x01;mstruct.adcSampleTime = 0x1F;STC32G_AdcInit(mstruct);while(1){ STC32G_AdcGetRes(&ADCRes);Uart1_SendString("ADCRes = ");LongToString(ADCRes,str);    Uart1_SendString(str);Uart1_SendString("\r\n"); TestVoltage = 5000.0/4096*ADCRes;FloatString(TestVoltage,str,2);Uart1_SendString("TestVoltage = ");Uart1_SendString(str);Uart1_SendString("mV");Uart1_SendString("\r\n");/*STC32G_ADCSELCH15()STC32G_AdcGetRes(&ADCRes);Uart1_SendString("ADCRes = ");LongToString(ADCRes,str);    Uart1_SendString(str);Uart1_SendString("\r\n"); TestVoltage = 5000.0/4096*ADCRes;FloatString(TestVoltage,str,2);Uart1_SendString("Inner Bandgap Voltage = ");Uart1_SendString(str);Uart1_SendString("mV");Uart1_SendString("\r\n");STC32G_ADCSELCH0()*/Uart1_SendString("This a ADC Test Program!");Uart1_SendString("\r\n");Uart1_SendString("\r\n");Uart1_SendString("\r\n");Delayxms(1000);}
}
//End of main()

测试板的参考电压为基准电压芯片AD586提供的5V电压。下面用一个10K的电位器将5V电源电压分压，将分压接到P1.0做AD输入，用ADC来测试分得电压的大小。

测得基准电压值：

测得分压值：

将程序编译，下载到单片机，在串口助手上看到的结果如下：

将源文件中的注释去掉，再获取内部Bandgap的ADC值，并将其转换为电压，结果如下：

从结果可以看出，获得的Bandgap电压并不是手册上所说的1.19V，至于为什么，不是此处讨论的范围。本例已完整演示了，如何调用ADC库函数，实现ADC值获取及如何用ADC测量电压。

相关库函数及示例源代码下载链接：

https://download.csdn.net/download/billliu66/87701680

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STC32G单片机内置ADC及应用编程

一 STC32G单片机内置ADC模块简介

二 STC32G单片机内置ADC模块的相关寄存器

三 ADC模块函数库编程

四应用编程示例

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STC32G单片机内置ADC及应用编程

一 STC32G单片机内置ADC模块简介

二 STC32G单片机内置ADC模块的相关寄存器

三 ADC模块函数库编程

四 应用编程示例

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四应用编程示例