LINUX下的eeprom读写测试程序

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <linux/i2c.h> #include <linux/i2c-dev.h> #include <errno.h> #include <sys/ioctl.h> #include <time.h> #include <sys/types.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <getopt.h> #include <string.h> #define I2C_ADDR 0x50 unsigned char buf[256]= { 0xA1, 0xA2, 0xA3 }; char val,value; float flight; int IIC_Write(int fd,unsigned char addr,unsigned char value) { unsigned char buf[2]; buf[0] = addr; buf[1] = value; return write(fd,buf,2); } int IIC_WriteBytes(int fd,unsigned char addr,unsigned char *buff,int len) { int i; for(i=0; i<len; i++) { IIC_Write(fd, addr+i, *(buff+i)); usleep(2000); } return 0; } int IIC_ReadByte(int fd,unsigned char addr) { int temp = 0; if(write(fd,&addr,1) < 0) return -1; if(read(fd,&temp,1) < 0) return -1; return temp; } int IIC_ReadBytes(int fd,unsigned char addr,unsigned char *buff,int len) { int temp = 0; write(fd,&addr,1); temp = read(fd,buff,len); return temp; } int main(void) { int fd; int i; fd=open("/dev/i2c-1",O_RDWR); if(fd<0) { printf("device open failed\n"); return 1; } if(ioctl( fd,I2C_SLAVE_FORCE,I2C_ADDR) < 0) { printf("ioctl failed:%d\n"); return 1; } printf("================eeprom write ==================\n"); IIC_WriteBytes(fd, 0, buf, sizeof(buf)); /* for(i=0;i<256;i++) { if(IIC_Write(fd, i, i) < 0) printf("%d ",i); usleep(2000); } */ printf("================eeprom read ==================\n"); if(IIC_ReadBytes(fd,0x00,buf,256) > 0) { for(i=0;i<256;i++) { if(i % 16 == 0) printf("\r\n"); printf("%.2X ",buf[i]); } return 0; } else printf("read error\r\n"); printf("\r\n\r\n"); // usleep(1000000);//sleep 0.1s }