前言

虚拟串口，端口 3 单向上报，端口 2 双向收发。

分析

端点 0

USBHS_UIS_TOKEN_OUT

设置串口参数：

1. 判断 USBHS_SetupReqCode == CDC_SET_LINE_CODING；
2. 波特率：USBHS_EP0_Buf 前四个字节，小端模式；
3. 停止位：USBHS_EP0_Buf 第五个字节（0：1 停止位；1：1.5 停止位；2：2 停止位）；
4. 校验位：USBHS_EP0_Buf 第六个字节（0：None；1：Odd；2：Even；3：Mark；4：Space）；
5. 数据位：USBHS_EP0_Buf 第七个字节（）；

/* Non-standard request end-point 0 Data download */
if( USBHS_SetupReqCode == CDC_SET_LINE_CODING )
{
    /* Save relevant parameters such as serial port baud rate */
    /* The downlinked data is processed in the endpoint 0 OUT packet, the 7 bytes of the downlink are, in order
       4 bytes: baud rate value: lowest baud rate byte, next lowest baud rate byte, next highest baud rate byte, highest baud rate byte.
       1 byte: number of stop bits (0: 1 stop bit; 1: 1.5 stop bit; 2: 2 stop bits).
       1 byte: number of parity bits (0: None; 1: Odd; 2: Even; 3: Mark; 4: Space).
       1 byte: number of data bits (5,6,7,8,16); */
    Uart.Com_Cfg[ 0 ] = USBHS_EP0_Buf[ 0 ];
    Uart.Com_Cfg[ 1 ] = USBHS_EP0_Buf[ 1 ];
    Uart.Com_Cfg[ 2 ] = USBHS_EP0_Buf[ 2 ];
    Uart.Com_Cfg[ 3 ] = USBHS_EP0_Buf[ 3 ];
    Uart.Com_Cfg[ 4 ] = USBHS_EP0_Buf[ 4 ];
    Uart.Com_Cfg[ 5 ] = USBHS_EP0_Buf[ 5 ];
    Uart.Com_Cfg[ 6 ] = USBHS_EP0_Buf[ 6 ];
    Uart.Com_Cfg[ 7 ] = DEF_UARTx_RX_TIMEOUT;

    /* save bauds */
    baudrate = USBHS_EP0_Buf[ 0 ];
    baudrate += ((uint32_t)USBHS_EP0_Buf[ 1 ] << 8 );
    baudrate += ((uint32_t)USBHS_EP0_Buf[ 2 ] << 16 );
    baudrate += ((uint32_t)USBHS_EP0_Buf[ 3 ] << 24 );
    Uart.Com_Cfg[ 7 ] = Uart.Rx_TimeOutMax;

    /* Uart usb init */
    UART_USB_Init( );
}

端点 2

USBHS_UIS_TOKEN_OUT

USBHSD->UEP2_RX_CTRL ^= USBHS_UEP_R_TOG_DATA1;
/* Record related information & Switch DMA Address*/
Uart.Tx_PackLen[ Uart.Tx_LoadNum ] = USBHSD->RX_LEN;
Uart.Tx_LoadNum++;
USBHSD->UEP2_RX_DMA = (uint32_t)(uint8_t *)&UART2_Tx_Buf[ ( Uart.Tx_LoadNum * DEF_USB_HS_PACK_LEN ) ];
if( Uart.Tx_LoadNum >= DEF_UARTx_TX_BUF_NUM_MAX )
{
    Uart.Tx_LoadNum = 0x00;
    USBHSD->UEP2_RX_DMA = (uint32_t)(uint8_t *)&UART2_Tx_Buf[ 0 ];
}
Uart.Tx_RemainNum++;

/* Determine if the downlink needs to be paused */
if( Uart.Tx_RemainNum >= ( DEF_UARTx_TX_BUF_NUM_MAX - 2 ) )
{
    USBHSD->UEP2_RX_CTRL &= ~USBHS_UEP_R_RES_MASK;
    USBHSD->UEP2_RX_CTRL |= USBHS_UEP_R_RES_NAK;
    Uart.USB_Down_StopFlag = 0x01;
}

USBHS_UIS_TOKEN_IN

Uart.USB_Up_IngFlag = 0x00;