使用的是RTT 2.1.0，开启了4个串口。串口1,2 3都是接设备，调试发现，串口在线程中初始化后，发送时，第一个字节掉了，用串口助手看第一个字节没有收到，后面都是正常 的，请问下为什么。
用的命令和MODBUS上面修改的。
/* ----------------------- Start implementation -----------------------------*/BOOL xMBPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity){ /** * set 485 mode receive and transmit control IO * @note MODBUS_SLAVE_RT_CONTROL_PIN_INDEX need be defined by user */ rt_pin_mode(MODBUS_SLAVE_RT_CONTROL_PIN_INDEX, PIN_MODE_OUTPUT); /* set serial name */ if (ucPORT == 1) {#if defined(RT_USING_UART1) || defined(RT_USING_REMAP_UART1) extern struct rt_serial_device serial1; serial = &serial1;#endif } else if (ucPORT == 2) {#if defined(RT_USING_UART2) extern struct rt_serial_device serial2; serial = &serial2;#endif } else if (ucPORT == 3) {#if defined(RT_USING_UART3) extern struct rt_serial_device serial3; serial = &serial3;#endif } /* set serial configure parameter */ serial->config.baud_rate = ulBaudRate; serial->config.stop_bits = STOP_BITS_1; switch(eParity){ case MB_PAR_NONE: { serial->config.data_bits = DATA_BITS_8; serial->config.parity = PARITY_NONE; break; } case MB_PAR_ODD: { serial->config.data_bits = DATA_BITS_9; serial->config.parity = PARITY_ODD; break; } case MB_PAR_EVEN: { serial->config.data_bits = DATA_BITS_9; serial->config.parity = PARITY_EVEN; break; } } /* set serial configure */ serial->ops->configure(serial, &(serial->config)); /* open serial device */ if (!serial->parent.open(&serial->parent, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX )) { serial->parent.rx_indicate = serial_rx_ind; } else { return FALSE; } /* software initialize */ rt_thread_init(&thread_serial_soft_trans_irq, "slave trans", serial_soft_trans_irq, RT_NULL, serial_soft_trans_irq_stack, sizeof(serial_soft_trans_irq_stack), 10, 5); rt_thread_startup(&thread_serial_soft_trans_irq); rt_event_init(&event_serial, "slave event", RT_IPC_FLAG_PRIO); return TRUE;}
在这个基础上修改的。
发送和读是这么写的
serial->parent.write(&(serial->parent), 0, &ucByte, len);serial->parent.read(&(serial->parent), 0, pucByte, len);
现在就是第一个字符收不到，搞的我读取配置有时不正常，要读多次。后面都正常，就开机第一个字符没了。
