[TM4C123單片機實戰] 兩路ADC檢測,短路報警

如果最終得到的數據是兩路數據的差值, 我們可以採用ADC的 Difference 工作模式

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "driverlib/adc.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "user/LCDDriver.h"

#define abs(x) (((x)<0)? -(x):(x))

uint32_t pui32ADC0Value[1]={0};
//這是我們的數據緩存, ADC採樣數據存儲在這裏

void adcConfig(){
	SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC1);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
	GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_1);
	
	GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3 | GPIO_PIN_2);
//初始化ADC所使用的GPIO	

        ADCSequenceConfigure(ADC1_BASE, 3, ADC_TRIGGER_PROCESSOR, 0);
	ADCSequenceStepConfigure(ADC1_BASE, 3, 0, ADC_CTL_D | ADC_CTL_CH0 |
                             ADC_CTL_IE | ADC_CTL_END);
//這裏我們選擇了兩路差工作模式ADC_CTL_D

	ADCSequenceEnable(ADC1_BASE, 3);
	ADCIntClear(ADC1_BASE, 3);
}//使能

bool isRisk(){//數據採集程序
	GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, 255);

	ADCProcessorTrigger(ADC1_BASE, 3);
	while(!ADCIntStatus(ADC1_BASE, 3, false));
	ADCIntClear(ADC1_BASE, 3);
	ADCSequenceDataGet(ADC1_BASE, 3, pui32ADC0Value);
	//AIN0(PE3) -  AIN1(PE2)
	LCD_Draw_Num(pui32ADC0Value[0],0,7,0,false);
	LCD_Draw_Line_Clear(6,false);
	if(pui32ADC0Value[0] > 500) return true;
	else return false;
}

關於ADc的引腳, 參考reference

關於ADC的模式:

參考reference