RT-Thread-【开发板评测】Renesas RA6M4开发板之IIC（软件）RT-Thread问答社区

【开发板评测】Renesas RA6M4开发板之IIC（软件）

发布于 2022-04-06 17:59:14 浏览：888 订阅该版

我之前发了测评 GPIO和UART的，这次是测评IIC（软件）的。
**软件配置**
在FSP中关闭IIC使能
![image.png](https://oss-club.rt-thread.org/uploads/20220406/397bfd558aee7ff5eac3fc8e2700d911.png.webp)
在stduio 中打开软件IIC 
![image.png](https://oss-club.rt-thread.org/uploads/20220406/3183eee4b644cf51db2a322eed307f42.png.webp)
****记住这里一定是 0x50c 0x50b 创建工程配置的不是这样，我找了半天才找到是因为这个，我一直没有把IIC,调好，我也不知道为什么，希望有大佬解释一下。
![image.png](https://oss-club.rt-thread.org/uploads/20220406/18edd86d0e79f10fcf0898ce7eae2202.png)
**代码编写**
创建 aht10.c 文件 ,复制rt例子中的i2c_aht10_sample.c 代码，我开始准备自己写的，但是看到这里有现成的代码就拿来直接使用了。 
![image.png](https://oss-club.rt-thread.org/uploads/20220406/7234b8151bbebcd99fb9e7bfa0689b79.png.webp)
```
#include <rtthread.h>
#include <rtdevice.h>
#define AHT10_I2C_BUS_NAME          "i2c1"  /* 传感器连接的I2C总线设备名称 */
#define AHT10_ADDR                  0x38    /* 从机地址 */
#define AHT10_CALIBRATION_CMD       0xE1    /* 校准命令 */
#define AHT10_NORMAL_CMD            0xA8    /* 一般命令 */
#define AHT10_GET_DATA              0xAC    /* 获取数据命令 */
static struct rt_i2c_bus_device *i2c_bus = RT_NULL;     /* I2C总线设备句柄 */
static rt_bool_t initialized = RT_FALSE;                /* 传感器初始化状态 */
/* 写传感器寄存器 */
static rt_err_t write_reg(struct rt_i2c_bus_device *bus, rt_uint8_t reg, rt_uint8_t *data)
{
    rt_uint8_t buf[3];
    struct rt_i2c_msg msgs;
    buf[0] = reg; //cmd
    buf[1] = data[0];
    buf[2] = data[1];
    msgs.addr = AHT10_ADDR;
    msgs.flags = RT_I2C_WR;
    msgs.buf = buf;
    msgs.len = 3;
    /* 调用I2C设备接口传输数据 */
    if (rt_i2c_transfer(bus, &msgs, 1) == 1)
    {
        return RT_EOK;
    }
    else
    {
        return -RT_ERROR;
    }
}
/* 读传感器寄存器数据 */
static rt_err_t read_regs(struct rt_i2c_bus_device *bus, rt_uint8_t len, rt_uint8_t *buf)
{
    struct rt_i2c_msg msgs;
    msgs.addr = AHT10_ADDR;
    msgs.flags = RT_I2C_RD;
    msgs.buf = buf;
    msgs.len = len;
    /* 调用I2C设备接口传输数据 */
    if (rt_i2c_transfer(bus, &msgs, 1) == 1)
    {
        return RT_EOK;
    }
    else
    {
        return -RT_ERROR;
    }
}
static void read_temp_humi(float *cur_temp, float *cur_humi)
{
    rt_uint8_t temp[6];
    write_reg(i2c_bus, AHT10_GET_DATA, 0);      /* 发送命令 */
    read_regs(i2c_bus, 6, temp);                /* 获取传感器数据 */
    /* 湿度数据转换 */
    *cur_humi = (temp[1] << 12 | temp[2] << 4 | (temp[3] & 0xf0) >> 4) * 100.0 / (1 << 20);
    /* 温度数据转换 */
    *cur_temp = ((temp[3] & 0xf) << 16 | temp[4] << 8 | temp[5]) * 200.0 / (1 << 20) - 50;
}
static void aht10_init(const char *name)
{
    rt_uint8_t temp[2] = {0, 0};
    /* 查找I2C总线设备，获取I2C总线设备句柄 */
    i2c_bus = (struct rt_i2c_bus_device *)rt_device_find(name);
    if (i2c_bus == RT_NULL)
    {
        rt_kprintf("can't find %s device!\n", name);
    }
    else
    {
        write_reg(i2c_bus, AHT10_NORMAL_CMD, temp);
        rt_thread_mdelay(400);
        temp[0] = 0x08;
        temp[1] = 0x00;
        write_reg(i2c_bus, AHT10_CALIBRATION_CMD, temp);
        rt_thread_mdelay(400);
        initialized = RT_TRUE;
    }
}
static void i2c_aht10_sample(int argc, char *argv[])
{
    float humidity, temperature;
    char name[RT_NAME_MAX];
    humidity = 0.0;
    temperature = 0.0;
    if (argc == 2)
    {
        rt_strncpy(name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(name, AHT10_I2C_BUS_NAME, RT_NAME_MAX);
    }
    if (!initialized)
    {
        /* 传感器初始化 */
        aht10_init(name);
    }
    if (initialized)
    {
        /* 读取温湿度数据 */
        read_temp_humi(&temperature, &humidity);
        rt_kprintf("read aht10 sensor humidity   : %d.%d %%\n", (int)humidity, (int)(humidity * 10) % 10);
        rt_kprintf("read aht10 sensor temperature: %d.%d \n", (int)temperature, (int)(temperature * 10) % 10);
    }
    else
    {
        rt_kprintf("initialize sensor failed!\n");
    }
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(i2c_aht10_sample, i2c aht10 sample);

```
**运行效果**
输入指令
![image.png](https://oss-club.rt-thread.org/uploads/20220406/8f441fa85762c322a7dd40af3c916e02.png)
**总结**
代码部分都是rt这边配置完毕，自己不用写多少代码就行，感谢rt的这次活动自己还是学到了很多东西。