lwip入网，4g发送数据卡死（同时开启了串口DMA，1s频率获取3k数据）

发布于 2023-06-01 16:36:46 浏览：642 订阅该版

当前通过lwip拨号入网，同时开启串口DMA进行数据收发，串口DMA数据收发频率为1s，数据量为3k，然后将这3k数据发送至远程服务器中。长时间运行一段时间之后，设备会卡死，直接重启了。

```c
/**
 *  using ppp_data_send send data to lwIP procotol stack     PPPoS serial output callback
 *
 * @param pcb           pcb PPP control block
 * @param data          data Buffer to write to serial port
 * @param len           the Length of the data buffer
 * @param ppp_device    ctx Context of callback , ppp_device
 *
 * @return  the point of rt_device_write fucntion or RT_NULL
 */
static uint32_t ppp_data_send(ppp_pcb *pcb, uint8_t *data, uint32_t len, void *ppp_device)
{
    RT_ASSERT(pcb != RT_NULL);
    RT_ASSERT(ppp_device != RT_NULL);

static uint32_t ppp_write_len=0;
    struct ppp_device *device = (struct ppp_device *)ppp_device;

if (device->state == PPP_STATE_PREPARE)
        return 0;

#ifdef PPP_DEVICE_DEBUG_TX
    LOG_D("TX:");
    ppp_debug_hexdump(data, len);
#endif

//    rt_kprintf("NETCONNTYPE_GROUP[=====1====]ppp_data_send\r\n");
    /* the return data is the actually written size on successful */
    ppp_write_len = rt_device_write(device->uart, 0, data, len);//数据在此处进入之后，线程即卡死，无法进行打印出下面的log信息
//    rt_kprintf("NETCONNTYPE_GROUP[=====1====]ppp_data_send,%d\r\n",ppp_write_len);
    return ppp_write_len;
}
```
暂时无法判断出当前数据具体问题在哪里导致设备异常