I2C_IIC

5 rtt i2c波形缺失

发布于 2021-05-25 14:47:08 浏览：1132 订阅该版

我根据官方aht10温湿度例程，稍微修改了下，逻辑分析仪读波形，发现只有地址的波形，没有数据位的波形，请求指点。
```c
/* 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;
    buf[1] = data[0]; //cmd buf[0] = reg;
    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)
    {
        LOG_D("发送中");
        return RT_EOK;
    }
    else
    {
        LOG_D("发送失败");
        return -RT_ERROR;
    }
}

static void z(int argc, char *argv[])
{
    float humidity, temperature;
    char name[RT_NAME_MAX];
    LOG_D("Hello RT-Thread!");
    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);
    }

while (1)
        {
        rt_uint8_t temp[2] = {0, 0};
          LOG_D("Hello");
          /* 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)
          {
              LOG_D("can't find %s device!\n", name);
          }
          else
          {
              LOG_D("can find %s device!\n", name);
         //   write_reg(i2c_bus, AHT10_NORMAL_CMD, temp);
          //    rt_thread_mdelay(400);

temp[0] = 0xAA;
             temp[1] = 0xAA;
              write_reg(i2c_bus, AHT10_NORMAL_CMD, temp);
//              rt_thread_mdelay(400);
              initialized = RT_TRUE;

}
    }

}

```

![490f9f0db078d5694661e7a587be681c.jpg](https://oss-club.rt-thread.org/uploads/20210525/490f9f0db078d5694661e7a587be681c.jpg)