adc_isr.c

lm3s615实验程序

#include "hw_memmap.h"
#include "hw_types.h"
#include "gpio.h"
#include "sysctl.h"
#include"interrupt.h"
#include "hw_ints.h"
#include "ADC.H"
void ADCInit(void)  //assumed that LM3S811 rev C was used
{
   SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC);   // 使能ADC时钟

   // 配置ADC的采样速率为500kps   
   SysCtlADCSpeedSet(SYSCTL_ADCSPEED_500KSPS );  

   ADCSequenceDisable(ADC_BASE, 0);	          // 禁止采样序列发生器

   // 配置采样序列的触发源和优先级
   ADCSequenceConfigure(ADC_BASE, 0, ADC_TRIGGER_PROCESSOR, 1);

   // 配置采样序列发生器的步进
   ADCSequenceStepConfigure(ADC_BASE, 0, 0, ADC_CTL_TS);
   ADCSequenceStepConfigure(ADC_BASE, 0, 1, ADC_CTL_TS | ADC_CTL_END);
   
   ADCSequenceEnable(ADC_BASE, 0);	         //使能采样序列中断
}



signed   int GetTemp(void)   //output temperture*100
{
 	unsigned long ulBuffer[2];
    signed   int i;
		
	ADCProcessorTrigger(ADC_BASE, 0); 		// 引发采样序列的处理器触发

	while(ADCSequenceDataGet(ADC_BASE, 0, ulBuffer) >=2)	; // 获取采样序列捕获的数据

	for(i=1; i<2; i++)
	{ ulBuffer[0] +=ulBuffer[i]; }

	ulBuffer[0] =(unsigned int) (ulBuffer[0]*300)/(0x400*2) ;   
  
	i=(unsigned int)( (270-ulBuffer[0])*75-5500 );	   // 得到终端 SENSO电压
    
	return(i);
}