main.c

将A0~A3四路模拟输入通道采集到的电压值显示在液晶屏上

//******************************************************************************
// 说明：将A0~A3四路模拟输入通道采集到的电压值显示在液晶屏上
//******************************************************************************
#include<msp430x14x.h>
#include"lcd12864.h"
// 全局变量
unsigned int A0results;
unsigned int A1results;
unsigned int A2results;
unsigned int A3results;
unsigned char A0[5] = {'x','x','x','x','\0'};
unsigned char A1[5] = {'x','x','x','x','\0'};
unsigned char A2[5] = {'x','x','x','x','\0'};
unsigned char A3[5] = {'x','x','x','x','\0'};
unsigned char title0[] = {"A0 Channel : "};
unsigned char title1[] = {"A1 Channel : "};
unsigned char title2[] = {"A2 Channel : "};
unsigned char title3[] = {"A3 Channel : "};
unsigned char number_tab[]={'0','1','2','3','4','5','6','7','8','9'};
// LED灯指示函数
void ledflash()
{
  unsigned int i = 10000;
  P1OUT ^= BIT1;
  while(i--);
}
// 分解位函数
void convert(unsigned int data,unsigned char *p)
{
  unsigned int a,b,c;
  p[0] = number_tab[data / 1000];
  a = data % 1000;
  p[1] = number_tab[a / 100];
  b = a % 100;
  p[2] = number_tab[b / 10];
  c = b % 10;
  p[3] = number_tab[c];
}
// 主函数
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;          // Stop watchdog timer
  InitLCD();                         // 液晶屏初始化
  P1DIR |= BIT1;
  ShowString86(0,0,title0);          // 在第0行，从第0列开始显示
  ShowString86(1,0,title1);          // 在第2行，从第0列开始显示
  ShowString86(2,0,title2);          // 在第4行，从第0列开始显示
  ShowString86(3,0,title3);          // 在第6行，从第0列开始显示
  P6SEL = 0x0F;                      // Enable A/D channel inputs
  ADC12CTL0 = ADC12ON + MSC + SHT0_8;// Turn on ADC12, extend sampling time
                                     // to avoid overflow of results
  ADC12CTL1 = SHP + CONSEQ_3;        // Use sampling timer, repeated sequence
  ADC12MCTL0 = INCH_0;               // ref+=AVcc, channel = A0
  ADC12MCTL1 = INCH_1;               // ref+=AVcc, channel = A1
  ADC12MCTL2 = INCH_2;               // ref+=AVcc, channel = A2
  ADC12MCTL3 = INCH_3 + EOS;         // ref+=AVcc, channel = A3, end seq.
  ADC12IE = 0x08;                    // Enable ADC12IFG.3
  ADC12CTL0 |= ENC;                  // Enable conversions
  ADC12CTL0 |= ADC12SC;              // Start conversion
  _BIS_SR(LPM0_bits + GIE);          // Enter LPM0, Enable interrupts
}
// ADC12转中断端服务程序
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
  A0results = ADC12MEM0;             // Move A0 results, IFG is cleared
  A1results = ADC12MEM1;             // Move A1 results, IFG is cleared
  A2results = ADC12MEM2;             // Move A2 results, IFG is cleared
  A3results = ADC12MEM3;             // Move A3 results, IFG is cleared
  convert(A0results,A0);             // 将A0采集到的电压值分解成四个数
  convert(A1results,A1);             // 将A0采集到的电压值分解成四个数
  convert(A2results,A2);             // 将A0采集到的电压值分解成四个数
  convert(A3results,A3);             // 将A0采集到的电压值分解成四个数
  ShowString86(0,13,A0);             // 将A0采集到的电压值显示在液晶屏上
  ShowString86(1,13,A1);             // 将A1采集到的电压值显示在液晶屏上
  ShowString86(2,13,A2);             // 将A2采集到的电压值显示在液晶屏上
  ShowString86(3,13,A3);             // 将A3采集到的电压值显示在液晶屏上
  ledflash();                        // led灯指示
}