IIC EEROM 驱动例程

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简介

本例程主要介绍了如何在EtherKit上使用RT-Thread的IIC框架完成通过对板子上的EEROM的读写功能；

硬件说明

EtherKit 上的EEROM 使用为AT24C16连接R9A07G084M08GBG 芯片的IIC0；

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FSP配置说明

新建stacks 选择r_iic_master 并配置IIC0配置信息如下：

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RT-Thread Settings 配置

在配置中打开RT-Thread的IIC 驱动框架与AT24C16的驱动软件包；

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示例工程说明

基于AT24C16的驱动软件包实现对EEROM的0x00,0x20地址写入与读出；

#ifdef PKG_USING_AT24CXX
#include "at24cxx.h"
#define EEPROM_I2C_NAME "i2c0"
static at24cxx_device_t at24c02_dev;
static void eeprom_test(void)
{
    char str1[] = "test string-hello rtthread\n";
    char str2[] = "test string-rzt2m eeprom testcase\n";
    uint8_t read_buffer1[50];
    uint8_t read_buffer2[50];
    at24c02_dev = at24cxx_init(EEPROM_I2C_NAME, 0x0);
    if (at24c02_dev == RT_NULL)
    {
        rt_kprintf("eeprom init failed\n");
        return;
    }
    rt_memset(read_buffer1, 0x0, sizeof(read_buffer1));
    rt_memset(read_buffer2, 0x0, sizeof(read_buffer2));
    at24cxx_write(at24c02_dev, 0x0, (uint8_t *)str1, (sizeof(str1) - 1));
    rt_kprintf("write eeprom data to 0x0: %s\n", str1);
    rt_thread_mdelay(1000);
    at24cxx_read(at24c02_dev, 0x0, read_buffer1, (sizeof(str1) - 1));
    rt_kprintf("read eeprom data from 0x0: %s\n", read_buffer1);
    at24cxx_write(at24c02_dev, 0x20, (uint8_t *)str2, (sizeof(str2) - 1));
    rt_kprintf("write eeprom data to 0x20: %s\n", str2);
    rt_thread_mdelay(1000);
    at24cxx_read(at24c02_dev, 0x20, read_buffer2, (sizeof(str2) - 1));
    rt_kprintf("read eeprom data from 0x20: %s\n", read_buffer2);
    if (rt_strcmp((const char *)str1, (const char *)read_buffer1) != 0 && rt_strcmp((const char *)str2, (const char *)read_buffer2) != 0)
        rt_kprintf("eeprom test fail\n");
    else
        rt_kprintf("eeprom test success\n");
    at24cxx_deinit(at24c02_dev);
}
MSH_CMD_EXPORT(eeprom_test, eeprom test sample);
#endif

编译&下载

  • RT-Thread Studio：在RT-Thread Studio 的包管理器中下载EtherKit 资源包，然后创建新工程，执行编译。

  • IAR：首先双击mklinks.bat，生成rt-thread与libraries 文件夹链接；再使用Env 生成IAR工程；最后双击project.eww打开IAR工程，执行编译。

编译完成后，将开发板的Jlink接口与PC 机连接，然后将固件下载至开发板。

运行效果

串口终端输入 eeprom_test指令：

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