驱动drv-15-at24c02 对应的测试程序

/*************************************************************** Copyright 2024-2029. All rights reserved. 文件名 : test_15_at24cxx.c 作者 : [email protected] 版本 : V1.0 描述 : 测试at24cxx驱动程序 其他 : 无 日志 : 初版V1.0 2024/02/15 https://blog.csdn.net/mftang/article/details/136203925 ***************************************************************/ #include <sys/types.h> #include <sys/stat.h> #include <linux/types.h> #include <linux/i2c-dev.h> #include <linux/i2c.h> #include <sys/ioctl.h> #include <unistd.h> #include <stdio.h> #include <string.h> #include <fcntl.h> #include <stdlib.h> #include <linux/fs.h> #include <unistd.h> #include <errno.h> #include <assert.h> #include <string.h> #include <time.h> #define DEV_FILE "/dev/at24cxx" #define i2c_dev "/dev/i2c-1" #define AT24CXX_ADDR 0x50 static int fd = -1; static int at24cxx_drv_init(void) { fd = open(i2c_dev, O_RDWR); if( fd < 0 ) { close( fd ); printf("%s %s i2c device open failure: %s\n", __FILE__, __FUNCTION__, strerror(errno)); return -1; } ioctl(fd, I2C_TENBIT, 0); ioctl(fd, I2C_SLAVE, AT24CXX_ADDR); printf("init at24cxx!\r\n"); return fd; } int read_page( unsigned char page, unsigned char *rbuff, unsigned char length ) { unsigned char tempbuff[1]; int i = 0, ret; tempbuff[0] = page; // address ret = write(fd, tempbuff, 1); if( ret < 0 ) { printf("%d %s %s i2c device write address fail: %s\n", __LINE__, __FILE__, __FUNCTION__, strerror(errno)); close(fd); return -1; } ret = read(fd, rbuff, length); if( ret < 0 ) { printf("%d %s %s i2c device read data fail: %s\n", __LINE__ , __FILE__, __FUNCTION__, strerror(errno)); close(fd); return -1; } printf(" read data to at24c02 in address = %d \r\n ", page); for( i=0; i< length; i++ ) { printf(" %x \t ", rbuff[i]); } printf(" \r\n "); return 0; } int write_page( unsigned char page, unsigned char *buff, unsigned char len) { unsigned char tempbuff[len+1]; int i = 0, ret; printf(" write data to at24c02 in address = %d \r\n ", page); // step-1: write tempbuff[0] = page; for( i=1; i< sizeof(tempbuff); i++ ) { tempbuff[i] = buff[i-1]; printf(" %x \t ", tempbuff[i]); } printf(" \r\n "); ret = write(fd, tempbuff, sizeof(tempbuff)); if( ret < 0 ) { printf("%d %s %s i2c device write data failure: %s\n",__LINE__, __FILE__, __FUNCTION__, strerror(errno)); close(fd); return -1; } return 0; } /* int main(void) { #define LEN 8 //定义一个page的字节个数 unsigned startpage = 8; // 起始页地址 unsigned char buff[LEN]; unsigned char rbuff[LEN]; int i = 0, index = 0, j= 0; fd = at24cxx_drv_init(); for( j=0; j < 5; j++ ) { // write data for(i = 0; i < sizeof( buff); i++ ) { buff[i] = 0x20 + index; index++; } write_page( startpage, buff, sizeof( buff)); printf(" \r\n \r\n "); startpage += 8; usleep(20000); //20ms } startpage = 8; for( j=0; j < 5; j++ ) { read_page( startpage, rbuff, sizeof( rbuff)); printf(" \r\n \r\n "); startpage += 8; usleep(20000); //20ms } return 0; } */ /* int main(void) { #define LEN 8 //定义一个page的字节个数 unsigned startpage = 8; // 起始页地址 unsigned char buff[LEN]; unsigned char rbuff[LEN]; int i = 0, index = 0, j= 0; fd = at24cxx_drv_init(); // 填充要写的数据 for(i = 0; i < sizeof( buff); i++ ) { buff[i] = 0x20 + index; index++; } write_page( startpage, buff, sizeof( buff)); printf(" \r\n \r\n "); usleep(20000); //20ms // 读取当前页的数据 startpage = 8; // 起始页地址 read_page( startpage, rbuff, sizeof( rbuff)); printf(" \r\n \r\n "); usleep(20000); //20ms return 0; } */ int main(void) { int fd, ret; int i = 0; unsigned char databuff[9]; unsigned char rdatabuff[8]; fd = open(DEV_FILE, O_RDWR); if (fd == -1){ printf("can not open file: %s \n", DEV_FILE); return -1; } printf("write to at24cxx: \r\n "); for( i=0; i< sizeof(databuff); i++ ) { databuff[i] = i; printf(" %x \t ", databuff[i]); } printf(" \r\n \r\n "); ret = write(fd, databuff, sizeof(databuff)); if( ret < 0 ) { printf("%d %s %s i2c device write data failure: %s\n",__LINE__, __FILE__, __FUNCTION__, strerror(errno)); close(fd); return -1; } sleep(1); rdatabuff[0] = 0; ret = read( fd, rdatabuff, sizeof(rdatabuff)); if( ret < 0 ) { printf("%d %s %s i2c device read data failure: %s\n",__LINE__, __FILE__, __FUNCTION__, strerror(errno)); close(fd); return -1; } printf("read from at24cxx: \r\n "); for( i=0; i< sizeof(rdatabuff); i++ ) { printf(" %x \t ", rdatabuff[i]); } printf(" \r\n \r\n "); sleep(1); close(fd); return 0; }