树莓派通过ADC0832采集模拟量
花费了近两个小时的时间,终于成功地将基于51MCU平台的ADC0832代码移植到了树莓派上。
ADC0832芯片的具体参数和用法我就不做解释了,网上一抓一大把。现在,将我写的代码呈现出来,供大家参考,本人才疏学浅,代码如有僻陋,敬请拍砖!
下图是ADC0832与树莓派的连接图,只需要三根线:
#include <wiringPi.h>
#include <stdio.h>
typedef unsigned char uchar;
typedef unsigned int uint;
#define ADC_CS 0
#define ADC_CLK 1
#define ADC_DIO 2
uchar get_ADC_Result(void)
{
uchar i;
uchar dat1=0, dat2=0;
digitalWrite(ADC_CS, 0);
digitalWrite(ADC_CLK,0);
digitalWrite(ADC_DIO,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,0);
digitalWrite(ADC_DIO,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,0);
digitalWrite(ADC_DIO,0); delayMicroseconds(2);//这里若写ADC_DIO为1,则选用通道1进行AD转换
digitalWrite(ADC_CLK,1);
digitalWrite(ADC_DIO,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,0);
digitalWrite(ADC_DIO,1); delayMicroseconds(2);
for(i=0;i<8;i++)
{
digitalWrite(ADC_CLK,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,0); delayMicroseconds(2);
pinMode(ADC_DIO, INPUT);
dat1=dat1<<1 | digitalRead(ADC_DIO);
}
for(i=0;i<8;i++)
{
dat2 = dat2 | ((uchar)(digitalRead(ADC_DIO))<<i);
digitalWrite(ADC_CLK,1); delayMicroseconds(2);
digitalWrite(ADC_CLK,0); delayMicroseconds(2);
}
digitalWrite(ADC_CS,1);
return(dat1==dat2) ? dat1 : 0;
}
int main(void)
{
uchar analogVal;
if(wiringPiSetup() == -1){ //when initialize wiring failed,print message to screen
printf("setup wiringPi failed !");
return 1;
}
pinMode(ADC_CS, OUTPUT);
pinMode(ADC_CLK, OUTPUT);
while(1){
pinMode(ADC_DIO, OUTPUT);
analogVal = get_ADC_Result();
printf("Current value : %d\n", analogVal);
delay(500);
}
return 0;
}