MT2503 串口编程

配置GPIO模式为UART

首先是配置IO为复用UART功能，使用

GPIO_ModeSetup(WIFI_UART_RX_PIN_NUM, 1);
GPIO_ModeSetup(WIFI_UART_TX_PIN_NUM, 1);

或

DCL_HANDLE wifi_uart_handle;

wifi_uart_handle = DclGPIO_Open(DCL_GPIO, WIFI_UART_RX_PIN_NUM);
DclGPIO_Control(wifi_uart_handle , GPIO_CMD_SET_MODE_1, NULL);

wifi_uart_handle = DclGPIO_Open(DCL_GPIO, WIFI_UART_TX_PIN_NUM);
DclGPIO_Control(wifi_uart_handle , GPIO_CMD_SET_MODE_1, NULL);

初始化串口

配置IO为UART后才能初始化UART的参数：

DCL_HANDLE handle;
UART_CTRL_POWERON_T power_on_data;
UART_CTRL_OPEN_T open_data;
UART_CTRL_OWNER_T owner_data;
UART_CTRL_DCB_T dcb_data;

handle = DclSerialPort_Open(port, 0);

/* 使能串口 */
power_on_data.bFlag_Poweron = on;
DclSerialPort_Control(handle, UART_CMD_POWER_ON, (DCL_CTRL_DATA_T *)&power_on_data);

/* 获取MOD */
DclSerialPort_Control(handle, SIO_CMD_GET_OWNER_ID, (DCL_CTRL_DATA_T *)&owner_data);

/* 打开串口 */
open_data.u4OwenrId = owner_data.u4OwenrId;
DclSerialPort_Control(handle, SIO_CMD_OPEN, (DCL_CTRL_DATA_T *)&open_data);

/* 切换MOD */
owner_data.u4OwenrId = MOD_xxx;
DclSerialPort_Control(handle, SIO_CMD_SET_OWNER, (DCL_CTRL_DATA_T *)&owner_data);

/* 设置串口参数 */
dcb_data.u4OwenrId                 = MOD_xxx;
dcb_data.rUARTConfig.u4Baud        = UART_BAUD_115200;
dcb_data.rUARTConfig.u1DataBits    = len_8;
dcb_data.rUARTConfig.u1StopBits    = sb_1;
dcb_data.rUARTConfig.u1Parity      = pa_none;
dcb_data.rUARTConfig.u1FlowControl = fc_none;
dcb_data.rUARTConfig.ucXonChar     = 0x11;
dcb_data.rUARTConfig.ucXoffChar    = 0x13;
dcb_data.rUARTConfig.fgDSRCheck    = KAL_FALSE;
DclSerialPort_Control(handle, SIO_CMD_SET_DCB_CONFIG, (DCL_CTRL_DATA_T *)&dcb_data);

DclSerialPort_Close(handle);

串口收数据

static kal_uint16 UART_GetBytes(UART_PORT port, kal_uint8 *Buffaddr, kal_uint16 Length, kal_uint8 *status, module_type ownerid)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
#ifdef __MTK_TARGET__
    DCL_HANDLE handle;
    UART_CTRL_GET_BYTES_T data;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    data.u4OwenrId  = ownerid;
    data.u2Length   = Length;
    data.puBuffaddr = Buffaddr;
    data.pustatus   = status;
    handle          = DclSerialPort_Open(port, 0);
    DclSerialPort_Control(handle, SIO_CMD_GET_BYTES, (DCL_CTRL_DATA_T *)&data);
    return data.u2RetSize;
#else
    return 0;
#endif
}

系统收到数据后会发送MSG_ID_UART_READY_TO_READ_IND事件给串口归属的模块，收到消息后将数据读出即可。

串口发数据

static kal_uint16 UART_PutBytes(UART_PORT port, kal_uint8 *Buffaddr, kal_uint16 Length, module_type ownerid)
{
/*----------------------------------------------------------------*/
/* Local Variables                                                */
/*----------------------------------------------------------------*/
#ifdef __MTK_TARGET__
    DCL_HANDLE handle;
    UART_CTRL_PUT_BYTES_T data;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    data.u4OwenrId  = ownerid;
    data.u2Length   = Length;
    data.puBuffaddr = Buffaddr;
    handle          = DclSerialPort_Open(port, 0);
    DclSerialPort_Control(handle, SIO_CMD_PUT_BYTES, (DCL_CTRL_DATA_T *)&data);
    return data.u2RetSize;
#else
    return 0;
#endif
}

发数据前应该等待上一次发送结束再发送：

static DCL_UINT16 UART_CheckTxAllSentOut(DCL_DEV port)
{
/*----------------------------------------------------------------*/
/* Local Variables                                                */
/*----------------------------------------------------------------*/
#ifdef __MTK_TARGET__
    DCL_HANDLE handle;
    UART_CTRL_CHECK_TSO_T data;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    handle = DclSerialPort_Open(port, 0);
    DclSerialPort_Control(handle, UART_CMD_CHECK_TX_SEND_OUT, (DCL_CTRL_DATA_T *)&data);
    DclSerialPort_Close(handle);
    return data.bFlag;
#else
    return 0;
#endif
}