aglie modbus丢包

发布于 2023-05-08 16:43:20 浏览：654 订阅该版

[tocm]

硬件配置：STM32F407ZGT6
软件环境：Rt-thread V4.10

用两路485进行通讯，启了两个线程工作，两个线程中使用了同一个软件包是agile_modbus-v1.1.2，波特率均为9600，偶尔出现丢包现象，读数据的时候偶尔也会出现读不到，尤其的是在写数据是会出现只写一半。是供用一个包导致的？

## 正常的包：
`0F 10 00 00 00 22 44 00 00 5B 6D 33 5D 5B 73 35 5D 5B 74 35 5D 5B 76 31 30 5D C7 EB B9 D8 BB FA BA F3 CA D5 C4 C9 CE DE C8 CB BB FA A3 AC CD EA B3 C9 BA F3 B0 B4 CF C2 A1 BE CA D5 C4 C9 CD EA B3 C9 A1 BF B0 B4 BC FC 00 00 00 F7 05`
## 异常的包：
`0F 10 00 00 00 22 44 00 00 5B 6D 33 5D 5B 73 35 5D 5B 74 35 5D 5B 76 31 30 5D C7 EB B9 D8 BB FA BA F3 CA D5 C4 C9 CE DE C8 CB BB FA A3 `

```c
int rs485_init(void)
{
    /* init config paras */
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

rt_pin_mode(RS485_RE_PIN, PIN_MODE_OUTPUT);
    RS485_RX_EN();

_rx_sem = rt_sem_create("rs485", 0, RT_IPC_FLAG_FIFO);
    if(_rx_sem == RT_NULL)
    {
        LOG_E("create rx_sem failed.");
        return -RT_ERROR;
    }

/* step1： find serial device  */
    _dev = rt_device_find("uart3");
    if (_dev == RT_NULL)
    {
        LOG_E("can't find device uart3.");
        rt_sem_delete(_rx_sem);
        return -RT_ERROR;
    }

/* step2： change serial config */
    config.baud_rate = BAUD_RATE_9600;  //baud_rate 9600
    config.data_bits = DATA_BITS_8;     //data_bits 8
    config.stop_bits = STOP_BITS_1;     //stop_bits 1
    config.bufsz = 256;                //bufsz     256
    config.parity = PARITY_NONE;        //parity    none

/* step3：  control serial config */
    rt_device_control(_dev, RT_DEVICE_CTRL_CONFIG, &config);

/* step4：  set reback function */
    rt_device_set_rx_indicate(_dev, rs485_ind_cb);

/* step5：  open serial device */
    rt_device_open(_dev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX);

return RT_EOK;
}
```