rt-thread/bsp/phytium/libraries/drivers_example/i2c_msg_sample.c

#include "rtconfig.h"
#if defined BSP_USING_I2C_MSG
#include "drv_log.h"
#include "drv_i2c.h"
#define TEST_DEVICE_ADDR 0x53
static struct rt_i2c_bus_device *i2c_test_bus = RT_NULL;
int i2c_msg_sample(int argc, char *argv[])
{
    rt_uint8_t write_content[] = {"Phytium Rt-thread I2C Msg Driver Test Successfully !!"};
    rt_uint8_t write_addr[2] = {0x0, 0x0};
    rt_uint8_t write_buf[2 + sizeof(write_content)];
    rt_memcpy(write_buf, write_addr, 2);
    rt_memcpy(write_buf + 2, write_content, sizeof(write_content));

    rt_uint8_t read_buf[2 + sizeof(write_content)];
    rt_memcpy(read_buf, write_addr, 2);

    char name[RT_NAME_MAX];
    rt_strncpy(name, "I2C3_MSG", RT_NAME_MAX);
    i2c_test_bus = (struct rt_i2c_bus_device *)rt_device_find(name);
    if (i2c_test_bus == RT_NULL)
    {
        rt_kprintf("can't find %s device!\n", name);
    }
    else
    {
        rt_kprintf("find %s device!!!!\n", name);
    }

    struct rt_i2c_msg write_msgs;
    write_msgs.addr = TEST_DEVICE_ADDR;
    write_msgs.flags = RT_I2C_WR;
    write_msgs.buf = write_buf;
    write_msgs.len = sizeof(write_buf);
    rt_i2c_transfer(i2c_test_bus, &write_msgs, 1);

    struct rt_i2c_msg read_msgs;
    read_msgs.addr = TEST_DEVICE_ADDR;
    read_msgs.flags = RT_I2C_RD;
    read_msgs.buf = read_buf;
    read_msgs.len = sizeof(read_buf);
    rt_i2c_transfer(i2c_test_bus, &read_msgs, 1);

    for (rt_uint8_t i = 0; i < sizeof(write_content); i++)
    {
        if (read_buf[i] != write_content[i])
        {
            return -RT_ERROR;
        }
    }
    printf("%s\n", read_buf);
    return RT_EOK;
}
MSH_CMD_EXPORT(i2c_msg_sample, i2c msg device sample);

#endif