树莓派开发ADC芯片CS1237（C语言和python库开发）

源码地址https://github.com/dyingstraw/CS1237

一、准备工作

sudo apt-get install git-core
sudo geit clone git://git.drogon.net/wiringPi
cd wieingPi
sudo ./build

#ifndef __CS1237__h__
#define __CS1237__h__
#include <stdio.h>
#include <wiringPi.h>
#define SCK 1
#define DOUT 4
#define SCK_LOW digitalWrite(SCK,0)
#define SCK_HIGN digitalWrite(SCK,1)
//树莓派wiring引脚对应关系如下

//AD转换数值与实际重量的增益
// #include <Python.h>
static double CS1237P = 0.0078742;

//初始化
void CS1237Init()
{
wiringPiSetup();
pinMode(SCK,OUTPUT);
pinMode(DOUT,INPUT);
pullUpDnControl(DOUT,PUD_UP);
SCK_LOW;
}
//是否转换完毕
int CS1237isReady()
{
if(digitalRead(DOUT)==0)
{
return 1;
}
return 0;
}
//配置函数
void CS1237Config()
{
//no op
}
//一次上升沿
void CS1237ClockUp()
{
SCK_LOW;
delayMicroseconds(10);
SCK_HIGN;
delayMicroseconds(10);
}
//读数据
int CS1237Read()
{
int tmp=0;
int now=0;
int i;
int num=100;
while(!CS1237isReady())
{
;
}

for(i=0;i<23;i++)
{
SCK_LOW;
delayMicroseconds(10);
SCK_HIGN;
delayMicroseconds(10);
now = digitalRead(DOUT);
//printf("%d,",now );
tmp *=2;
tmp = tmp+now;

SCK_LOW;
}

SCK_LOW;
CS1237ClockUp();
CS1237ClockUp();
CS1237ClockUp();
SCK_LOW;

return tmp;
}

//得到平均立波得到实际数值
//num：采样次数
int getValue(int num)
{
int i=0;
int tmp=0;
long weight = 0;
for(i=0;i<num;i++)
{
tmp = CS1237Read();
weight =weight + tmp;
}
return weight/num;
}
int getHelp(int num)
{
return num*3;
}
#endif

#include "CS1237.h"
int main()
{
int tmp,Orign;
printf("hello rasp  %s\n","dsc" );
//初始化CS1237
CS1237Init();
//得到初试点（0点校正）
Orign = getValue(200);
printf("Orign value is %d\n", Orign);
while(1)
{
tmp = getValue(100);
printf("now is %lf\n", (tmp-Orign)*CS1237P);
}
}

gcc CS1237.c -o test -lwiringPi

./test

二、将程序封装为python可调用的库

#include <stdio.h>
#include <wiringPi.h>
#define SCK 1
#define DOUT 4
#define SCK_LOW digitalWrite(SCK,0)
#define SCK_HIGN digitalWrite(SCK,1)
//树莓派wiring引脚对应关系如下

//AD转换数值与实际重量的增益
#include <Python.h>
static double CS1237P = 0.0078742;

//初始化
void CS1237Init()
{
wiringPiSetup();
pinMode(SCK,OUTPUT);
pinMode(DOUT,INPUT);
pullUpDnControl(DOUT,PUD_UP);
SCK_LOW;
}
//是否转换完毕
int CS1237isReady()
{
if(digitalRead(DOUT)==0)
{
return 1;
}
return 0;
}
//配置函数
void CS1237Config()
{
//no op
}
//一次上升沿
void CS1237ClockUp()
{
SCK_LOW;
delayMicroseconds(10);
SCK_HIGN;
delayMicroseconds(10);
}
//读数据
int CS1237Read()
{
int tmp=0;
int now=0;
int i;
int num=100;
while(!CS1237isReady())
{
;
}

for(i=0;i<23;i++)
{
SCK_LOW;
delayMicroseconds(10);
SCK_HIGN;
delayMicroseconds(10);
now = digitalRead(DOUT);
//printf("%d,",now );
tmp *=2;
tmp = tmp+now;

SCK_LOW;
}

SCK_LOW;
CS1237ClockUp();
CS1237ClockUp();
CS1237ClockUp();
SCK_LOW;

return tmp;
}

//得到平均立波得到实际数值
//num：采样次数

int getValue(int num)
{
int i=0;
int tmp=0;
long weight = 0;
for(i=0;i<num;i++)
{
tmp = CS1237Read();
weight =weight + tmp;
}
return weight/num;
}

int getHelp(int num)
{
return num*3;
}

PyObject * wrap_getValue(PyObject *self,PyObject *args)
{
int num;
int weight;
if(!PyArg_ParseTuple(args,"i:getValue",&num))
return NULL;
weight = getValue(num);
return Py_BuildValue("i",weight);
}
PyObject * wrap_getHelp(PyObject *self,PyObject *args)
{
int num;
int weight;
if(!PyArg_ParseTuple(args,"i:getValue",&num))
return NULL;
weight = getHelp(num);
return Py_BuildValue("i",weight);
}

PyObject * wrap_CS1237Init(PyObject *self,PyObject *args)
{
int num;
int weight;
CS1237Init();
return NULL;
}
static PyMethodDef CS1237Methods[]=
{
{"getValue",wrap_getValue,METH_VARARGS,"get weignt adc valie"},
{"getHelp",wrap_getHelp,METH_VARARGS,"get help adc valie"},
{"CS1237Init",wrap_CS1237Init,METH_VARARGS,"get help adc valie"},
{NULL,NULL}
};

void initCS1237()
{
PyObject *m;
CS1237Init();
m = Py_InitModule("CS1237",CS1237Methods);
}

gcc -fPIC CS1237.c -o CS1237.so -shared  -I/usr/include/python2.7 -I/usr/lib/python2.7/config

# test.py
# coding=utf-8
import CS1237
tmp = CS1302.getValue(20)
print temp

python test.py

33077