一? STC32G單片機內置ADC模塊簡介

? ? ? STC32G單片機內部集成了一個12位高速ADC轉換器，ADC的最高時鐘頻率為系統頻率的1/2。其輸入通道多達15個（第15通道為專門測量內部1.19V參考信號源的通道），可分時切換使用。

? ? ? STC15系列單片機內置ADC模塊以電源電源作為ADC參考電壓，STC32G的ADC模塊則與之不同，它有單獨的參考電壓源引腳，可以接入精準的參考電壓（0~5V皆可），以獲得穩定的ADC值；參考電源引腳也可直接與MCU供電電源連接，不過AD轉換結果可能會收到電源電源波動的影響。注意：STC32GADC模塊的參考電壓輸入引腳不可懸空。

? ? ? ?STC32G單片機的內置ADC模塊轉換結果存儲在兩個8位寄存器中，可配置為左對齊（高8位存儲在高位寄存器ADC_RES中，低四位存儲在低位寄存器ADC_REL的高四位中），可配置為右對齊（高4位存儲在高位寄存器ADC_RES的低4位中，低8位存儲在低位寄存器ADC_REL中）。

二? STC32G單片機內置ADC模塊的相關寄存器

STC32G單片機內置ADC模塊的相關寄存器包含控制寄存器ADC_CONTR、轉換結果高位寄存器ADC_RES、轉換結果低位寄存器ADC_RESL、配置寄存器ADCCFG、時序控制寄存器ADCTIM。下面是STC用戶手冊對這幾個寄存器的功能介紹。

寄存器ADC_CONTR

配置寄存器ADCCFG

?時序控制寄存器ADCTIM

?

三? ADC模塊函數庫編程

? ? ? ?ADC模塊應用離不開相關寄存器編程，先將常用的寄存器配置操作編寫成庫函數供以后調用。

? ? ? 頭文件

/*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 應用編程示例

? ?下面寫段示例程序，演示ADC庫文件的使用。

? ? 頭文件：

/*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()

? ? 測試板的參考電壓為基準電壓芯片AD586提供的5V電壓。下面用一個10K的電位器將5V電源電壓分壓，將分壓接到P1.0做AD輸入，用ADC來測試分得電壓的大小。

測得基準電壓值：

測得分壓值：

?

將程序編譯，下載到單片機，在串口助手上看到的結果如下：

將源文件中的注釋去掉，再獲取內部Bandgap的ADC值，并將其轉換為電壓，結果如下：

從結果可以看出，獲得的Bandgap電壓并不是手冊上所說的1.19V，至于為什么，不是此處討論的范圍。本例已完整演示了，如何調用ADC庫函數，實現ADC值獲取及如何用ADC測量電壓。

相關庫函數及示例源代碼下載鏈接：

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

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