i2c_demo_program_needtest080803.c

应用于S3C2440芯片的I2C设备驱动程序

/* *********I2c Read Data Demo Program*******************************
 Program Name:I2c Read Data Demo Program
 Function:test i2c Reading Data using the "i2c_driver_test" driver pro
 Designer:Donglei ([e-mail])
 Description:Read 8 bytes from MCU by i2c bus
 Edition:1.0  8_2_08  Afternoon
 Problem: The first data of 8 bytes is wrong, can't keep it operating well everytime.
          And the data which sended need modified by MCU
 In addition:Basically it's ok for project,while it need advanted improvment 
/*************************Read test****************************/	
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <sys/types.h>
#include <fcntl.h>
#include <linux/i2c.h>

#define slaveAddr            0x60       //set salve address    ps:0x00 is not an availiable address   
#define iicRDTransNum        8          //set read number
#define iicWRTransNum        8          //set write number
#define CmdIICLK             3          //set the i2c clk
#define CmdWR                2          //set write byte number
#define CmdRD                1          //set read byte number
#define CmdSetAddr           0          //cmd to set salve address    ps:0x00 is not an availiable address
#define HighFreq             1          //16 prescale for IICCLK
#define LowFreq              0          //16 prescale for IICCLK
#define WriteMode            1          //the write test switch flag    0: not use; 1: use
#define ReadMode             1          //the read test seitch flag     0: not use; 1: use
char sendData[iicWRTransNum];
char recData[iicRDTransNum];

void make_data()
{
	char i;
	for(i=0;i<iicWRTransNum;i++)
	{
		sendData[i] = i;
	}
}

int main(void)
{
	int i;
	int fd;
	int wr;
	int rd;
	int ioset;
	char *write_test;
	char *read_test;
	make_data();
	write_test = sendData;
	read_test = recData;
	if(WriteMode)
 {
	fd = open("/dev/i2c_test",O_WRONLY);
	if(fd<0)
	{
		perror("Not open device i2c_test!\n");
		exit(1);
	}
	printf("Open device i2c !\n");
	
	ioset = ioctl(fd,CmdSetAddr,slaveAddr);
	if(ioset<0)
	{
		perror("Wrong set paramenter1!\n");
	}
	printf("Slave address set is ok!\n");
	ioset = ioctl(fd,CmdWR,iicWRTransNum);
	if(ioset<0)
	{
		perror("Wrong set paramenter2!\n");
	}
	printf("Slave address set is ok!\n");
	ioset = ioctl(fd,CmdIICLK,HighFreq);
	if(ioset<0)
	{
		perror("Wrong set paramenter3!\n");
	}
	printf("Slave address set is ok!\n");
	wr = write(fd,write_test,iicWRTransNum);

	if(wr<0)
	{
		perror("Not pass write test!\n");
		exit(1);
	}
	printf("write operation is ok!\n");
	close(fd);
	printf("Write i2c tests pass!!\n");
 }
  if(ReadMode)
 {
	fd = open("/dev/i2c_test",O_RDONLY);
	if(fd<0)
	{
		perror("Not open device i2c_test!\n");
		exit(1);
	}
	printf("Open device i2c !\n");
	ioset = ioctl(fd,CmdSetAddr,slaveAddr);
	if(ioset<0)
	{
		perror("Wrong set paramenter1!\n");
	}
	printf("Slave address set is ok!\n");
		ioset = ioctl(fd,CmdRD,iicRDTransNum);
		if(ioset<0)
	{
		perror("Wrong set paramenter2!\n");
	}
	printf("Slave address set is ok!\n");
	ioset = ioctl(fd,CmdIICLK,HighFreq);
	if(ioset<0)
	{
		perror("Wrong set paramenter3!\n");
	}
	printf("Slave address set is ok!\n");
	
	rd = read(fd,read_test,iicRDTransNum);
	if(rd<0)
	{
		perror("Not pass read test!\n");
		exit(1);
	}
	printf("\n");
	for(i=1;i<=iicRDTransNum; i++)
	{
		printf("%d",*read_test);
		read_test++;
	}
	printf("Read operation is ok!\n");
	close(fd);
	printf("Read i2c tests pass!!\n");
}	
	return 0;
		
}