undefined reference to `rt_i2c_bus_device_register'

发布于 2023-03-27 11:21:32 浏览：463 订阅该版

```c
#include <rtthread.h>
#include <rtdevice.h>
#include "driver/i2c.h"
#include <drv_gpio.h>
#include <drv_hw_i2c.h>
// #define OLED_ADDR 0x3C

// #define OLED_CMD 0
// #define OLED_DATA 1

#define portTICK_RATE_MS     portTICK_PERIOD_MS

struct esp32_c3_i2c
{
    struct rt_i2c_bus_device bus;
    i2c_config_t i2c_cofig;
    char *device_name;
};

struct esp32_c3_i2c hw_i2c;

static rt_err_t i2c_master_init(void)
{
     i2c_config_t conf;
    conf.mode = I2C_MODE_MASTER;
    conf.sda_io_num = I2C_MASTER_SDA_IO;
    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
    conf.scl_io_num = I2C_MASTER_SCL_IO;
    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
    conf.master.clk_speed = 100000;
    hw_i2c.i2c_cofig=conf;
    i2c_param_config(I2C_MASTER_NUM, &conf);
    return i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
}

static rt_size_t es32c3_master_xfer(struct rt_i2c_bus_device *bus,
                                    struct rt_i2c_msg msgs[],
                                    rt_uint32_t num)
{
  ...
}

static struct rt_i2c_bus_device_ops es32c3_i2c_ops =
    {
        es32c3_master_xfer,
        RT_NULL,
        RT_NULL
};

int rt_hw_i2c_init(void)
{
    i2c_master_init();
    struct rt_i2c_bus_device i2c_bus_device=hw_i2c.bus;
    hw_i2c.device_name="i2c0";
    i2c_bus_device.priv = (void *)I2C_MASTER_NUM;
    i2c_bus_device.timeout = 0x0fffffff;
    i2c_bus_device.retries = 0;
    i2c_bus_device.ops = es32c3_master_xfer;

rt_err_t result = rt_i2c_bus_device_register(
        &i2c_bus_device,
        "i2c0");

if (result != RT_EOK)
    {
        rt_kprintf("i2c device register failed\n");
        return result;
    }

rt_kprintf("i2c device register succeeded\n");

return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
```
不知道为什么编译的时候报这个错误
```
FAILED: rtthread.elf
cmd.exe /C "cd . && D:\rt-thread-master\bsp\ESP32_C3\packages\tools\riscv32-esp-elf\esp-2022r1-11.2.0\riscv32-esp-elf\bin\riscv32-esp-elf-g++.exe -march=rv32imc -nostartfiles -march=rv32imc --specs=nosys.specs @CMakeFiles\rtthread.elf.rsp -o rtthread.elf  && cd ."
d:/rt-thread-master/bsp/esp32_c3/packages/tools/riscv32-esp-elf/esp-2022r1-11.2.0/riscv32-esp-elf/bin/../lib/gcc/riscv32-esp-elf/11.2.0/../../../../riscv32-esp-elf/bin/ld.exe: esp-idf/main/libmain.a(drv_hw_i2c.c.obj): in function `rt_hw_i2c_init':
D:/rt-thread-master/bsp/ESP32_C3/drivers/drv_hw_i2c.c:108: undefined reference to `rt_i2c_bus_device_register'
collect2.exe: error: ld returned 1 exit status
```

![编译报错.png](https://oss-club.rt-thread.org/uploads/20230327/1d86fc60feaa8ad79e016e1bc4c80a53.png)