I2C传感器运行时显示Send Address Fail

发布于 2022-05-20 00:04:18 浏览：704 订阅该版

我在仿照官方例程编写HDC1080的I2C驱动，编译时没有发现错误，但是在烧到板子上运行时出现I2C:timeout,Send Address Fail.如下图所示。![9f581f27e68657f4ded6365f48eb2f06.jpg](https://oss-club.rt-thread.org/uploads/20220519/9f581f27e68657f4ded6365f48eb2f06.jpg)
我这边编写的代码如下，请大神们帮忙指点一下，谢谢了。```
```
#define hdc1080_I2C_BUS_NAME      "i2c1"  /* 传感器连接的I2C总线设备名称 */
#define hdc1080_ADDR               0x40   /* 从机地址 */

#define T_MEASUREMENT 0x00                 /* Temperature measurement output */
#define RH_MEASUREMENT 0x01                /* Relative Humidity measurement output */
#define CONFIGURATION 0x02                 /* HDC1080 configuration and status */
#define FIRST_SID 0xFB                     /* First 2 bytes of the serial ID of the part */
#define MID_SID 0xFC                       /* Mid 2 bytes of the serial ID of the part */
#define LAST_SID 0xFD                      /* Last byte bit of the serial ID of the part */
#define MANUFACTURE_ID 0xFE                /* ID of Texas Instruments,0x5449 */
#define DEVICE_ID 0xFF                     /* ID of the device,0x1050 */

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-05-18     4DX       the first version
 */
#include "hdc1080.h"
#include "finsh.h"
#include "drivers\i2c.h"
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;
    rt_uint32_t buf_size = 1;

buf[0] = reg; //cmd
    if (data != RT_NULL)
    {
        buf[1] = data[0];
        buf[2] = data[1];
        buf_size = 3;
    }

msgs.addr = hdc1080_ADDR;
    msgs.flags = RT_I2C_WR;
    msgs.buf = buf;
    msgs.len = buf_size;

/* 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 = hdc1080_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 hdc1080_init()
{
    rt_uint8_t IDBuffer[2]={0};
    rt_uint8_t InitSetup[2]={0x90,0x00};
    rt_uint32_t SID[3]={0},MID=0,DID=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(hdc1080_I2C_BUS_NAME);

if (i2c_bus == RT_NULL)
    {
        rt_kprintf("can't find %s device!\n", hdc1080_I2C_BUS_NAME);
    }
    else
    {
        write_reg(i2c_bus, CONFIGURATION, InitSetup);
        rt_thread_mdelay(400);

write_reg(i2c_bus, DEVICE_ID, RT_NULL);
        read_regs(i2c_bus,2,IDBuffer);
        DID = (((rt_uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);
        rt_kprintf("The DeviceID is 0x%x\n\r",DID);

write_reg(i2c_bus, MANUFACTURE_ID, RT_NULL);
        read_regs(i2c_bus,2,IDBuffer);
        MID = (((rt_uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);
        rt_kprintf("The ManufatureID is 0x%x\n\r",MID);

write_reg(i2c_bus, FIRST_SID, RT_NULL);
        read_regs(i2c_bus,2,IDBuffer);
        SID[0] = (((rt_uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);

write_reg(i2c_bus, MID_SID, RT_NULL);
        read_regs(i2c_bus,2,IDBuffer);
        SID[1] = (((rt_uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);

write_reg(i2c_bus, LAST_SID, RT_NULL);
        read_regs(i2c_bus,2,IDBuffer);
        SID[2] = (((rt_uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);

rt_kprintf("The First bytes of the serial ID of the part is 0x%x\n\r",SID[0]);
        rt_kprintf("The MID bytes of the serial ID of the part is 0x%x\n\r",SID[1]);
        rt_kprintf("The Last bytes of the serial ID of the part is 0x%x\n\r",SID[2]);
        rt_kprintf("\n\r");

initialized = RT_TRUE;
    }
}

static void read_temp_humi(float *cur_temp, float *cur_humi)
{
    rt_uint8_t temp[4];
    rt_uint16_t buf_temp,buf_humi;

write_reg(i2c_bus, T_MEASUREMENT, RT_NULL);      /* 发送命令 */
    rt_thread_mdelay(20);
    read_regs(i2c_bus, 4, temp);                /* 获取传感器数据 */

/* 温度数据转换 */
    buf_temp = ((( rt_uint16_t)temp[0])<<8 | temp[1]);
    *cur_temp = (float)(buf_temp)/(65536)*165-40;
    /* 湿度数据转换 */
    buf_humi = ((( rt_uint16_t)temp[2])<<8 | temp[3]);
    *cur_humi = (float)(buf_humi)/(65536)*100;
}

static void hdc1080(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, hdc1080_I2C_BUS_NAME, RT_NAME_MAX);
    }

if (!initialized)
    {
        /* 传感器初始化 */
        hdc1080_init(name);
    }
    if (initialized)
    {
        /* 读取温湿度数据 */
        read_temp_humi(&temperature, &humidity);

rt_kprintf("read hdc1080 sensor humidity   : %.2f%%\n\r", humidity);
        rt_kprintf("read hdc1080 sensor temperature: %.2f°C\n\r", temperature);

}
    else
    {
        rt_kprintf("initialize sensor failed!\n");
    }
}

MSH_CMD_EXPORT(hdc1080, read temperature and humidity);

```