树莓派通过ADC0832采集模拟量

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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   2uchar 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 screenprintf("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;}

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