348 lines
10 KiB
C
348 lines
10 KiB
C
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/*
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* cdc.c
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*
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* Created on: Nov 6, 2024
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* Author: true
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*/
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#include "cdc.h"
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#include "usb_lib.h"
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#include "../../usblib/config/usb_desc.h"
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#include "../../usblib/config/usb_prop.h"
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#define USB_TIM TIM4
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#define USB_TIM_IRQn TIM4_IRQn
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/*******************************************************************************/
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/* Variable Definition */
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/* Global */
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/* The following are serial port transmit and receive related variables and buffers */
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volatile CDC_CTL Cdc;
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__attribute__ ((aligned(4))) uint8_t CDC_Tx_Buf[DEF_CDC_TX_BUF_LEN]; /* Serial port 2 transmit data buffer */
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__attribute__ ((aligned(4))) uint8_t CDC_Rx_Buf[DEF_CDC_RX_BUF_LEN]; /* Serial port 2 receive data buffer */
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extern uint8_t USBD_Endp3_Busy;
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/*********************************************************************
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* @fn USB_TIM_Init
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*
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* @brief 100us Timer
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* 144 * 100 * 13.8888 -----> 100uS
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* todo: document why we need this counter.
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*
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* @return none
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*/
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void USB_TIM_Init( void )
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{
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TIM_TimeBaseInitTypeDef tim = {0};
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TIM_DeInit(USB_TIM);
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/* Time base configuration */
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tim.TIM_Period = 100 - 1;
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tim.TIM_Prescaler = SystemCoreClock / 1000000 - 1;
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tim.TIM_ClockDivision = 0;
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tim.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(USB_TIM, &tim);
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/* Clear USB_TIM update pending flag */
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TIM_ClearFlag(USB_TIM, TIM_FLAG_Update);
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/* TIM IT enable */
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TIM_ITConfig(USB_TIM, TIM_IT_Update, ENABLE);
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/* Enable Interrupt */
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NVIC_EnableIRQ(USB_TIM_IRQn);
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/* USB_TIM enable counter */
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TIM_Cmd(USB_TIM, ENABLE);
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}
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/*********************************************************************
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* @fn UART2_ParaInit
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*
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* @brief Cdc2 parameters initialization
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* mode = 0 : Used in usb modify initialization
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* mode = 1 : Used in default initializations
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* @return none
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*/
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void CDC_ParaInit(uint8_t mode)
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{
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uint8_t i;
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Cdc.Rx_LoadPtr = 0x00;
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Cdc.Rx_DealPtr = 0x00;
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Cdc.Rx_RemainLen = 0x00;
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Cdc.Rx_TimeOut = 0x00;
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Cdc.Rx_TimeOutMax = 30;
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Cdc.Tx_LoadNum = 0x00;
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Cdc.Tx_DealNum = 0x00;
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Cdc.Tx_RemainNum = 0x00;
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for(i = 0; i < DEF_CDC_TX_BUF_NUM_MAX; i++) {
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Cdc.Tx_PackLen[ i ] = 0x00;
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}
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Cdc.Tx_Flag = 0x00;
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Cdc.Tx_CurPackLen = 0x00;
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Cdc.Tx_CurPackPtr = 0x00;
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Cdc.USB_Up_IngFlag = 0x00;
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Cdc.USB_Up_TimeOut = 0x00;
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Cdc.USB_Up_Pack0_Flag = 0x00;
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Cdc.USB_Down_StopFlag = 0x00;
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if(mode) {
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Cdc.Com_Cfg[ 0 ] = (uint8_t)( DEF_CDC_BAUDRATE );
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Cdc.Com_Cfg[ 1 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 8 );
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Cdc.Com_Cfg[ 2 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 16 );
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Cdc.Com_Cfg[ 3 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 24 );
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Cdc.Com_Cfg[ 4 ] = DEF_CDC_STOPBIT;
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Cdc.Com_Cfg[ 5 ] = DEF_CDC_PARITY;
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Cdc.Com_Cfg[ 6 ] = DEF_CDC_DATABIT;
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Cdc.Com_Cfg[ 7 ] = DEF_CDC_RX_TIMEOUT;
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}
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}
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/*********************************************************************
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* @fn CDC_USB_Init
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*
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* @brief CDC initialization in usb interrupt
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*
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* @return none
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*/
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void CDC_USB_Init(void)
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{
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uint32_t baudrate;
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uint8_t stopbits __attribute__((unused));
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uint8_t parity __attribute__((unused));
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baudrate = ( uint32_t )( Cdc.Com_Cfg[ 3 ] << 24 ) + ( uint32_t )( Cdc.Com_Cfg[ 2 ] << 16 );
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baudrate += ( uint32_t )( Cdc.Com_Cfg[ 1 ] << 8 ) + ( uint32_t )( Cdc.Com_Cfg[ 0 ] );
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stopbits = Cdc.Com_Cfg[ 4 ];
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parity = Cdc.Com_Cfg[ 5 ];
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// this is the point where you would apply these settings.
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// since we are virtual only with no real UART, there is nothing to do here.
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// UART2_Init( 0, baudrate, stopbits, parity );
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}
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/*********************************************************************
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* @fn UART2_DataTx_Process
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*
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* @brief Cdc2 data transmission processing
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*
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* @return none
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*/
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void CDC_DataTx_Process( void )
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{
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// uint16_t count;
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/* uart1 transmission processing */
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if( Cdc.Tx_Flag ) {
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// process incoming data from the host.
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/*
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// Query whether the DMA transmission of the serial port is completed
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if( USART2->STATR & USART_FLAG_TC )
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{
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USART2->STATR = (uint16_t)( ~USART_FLAG_TC );
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USART2->CTLR3 &= ( ~USART_DMAReq_Tx );
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Cdc.Tx_Flag = 0x00;
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NVIC_DisableIRQ( USB_LP_CAN1_RX0_IRQn );
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NVIC_DisableIRQ( USB_HP_CAN1_TX_IRQn );
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// Calculate the variables of last data
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count = Cdc.Tx_CurPackLen - DEF_UART2_TX_DMA_CH->CNTR;
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Cdc.Tx_CurPackLen -= count;
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Cdc.Tx_CurPackPtr += count;
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if( Cdc.Tx_CurPackLen == 0x00 )
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{
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Cdc.Tx_PackLen[ Cdc.Tx_DealNum ] = 0x0000;
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Cdc.Tx_DealNum++;
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if( Cdc.Tx_DealNum >= DEF_CDC_TX_BUF_NUM_MAX )
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{
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Cdc.Tx_DealNum = 0x00;
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}
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Cdc.Tx_RemainNum--;
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}
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// If the current serial port has suspended the downlink, restart the driver downlink
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if( ( Cdc.USB_Down_StopFlag == 0x01 ) && ( Cdc.Tx_RemainNum < 2 ) )
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{
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SetEPRxValid( ENDP2 );
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Cdc.USB_Down_StopFlag = 0x00;
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}
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*/
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NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
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NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
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//}
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}
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else
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{
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// Load data from the serial port send buffer to send
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if(Cdc.Tx_RemainNum) {
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// Determine whether to load from the last unsent buffer or from a new buffer
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if( Cdc.Tx_CurPackLen == 0x00 ) {
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Cdc.Tx_CurPackLen = Cdc.Tx_PackLen[ Cdc.Tx_DealNum ];
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Cdc.Tx_CurPackPtr = ( Cdc.Tx_DealNum * DEF_USB_FS_PACK_LEN );
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}
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// todo: figure out wtf all this does.
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/*
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// Configure DMA and send
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USART_ClearFlag( USART2, USART_FLAG_TC );
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DMA_Cmd( DEF_UART2_TX_DMA_CH, DISABLE );
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DEF_UART2_TX_DMA_CH->MADDR = (uint32_t)&UART2_Tx_Buf[ Cdc.Tx_CurPackPtr ];
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DEF_UART2_TX_DMA_CH->CNTR = Cdc.Tx_CurPackLen;
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DMA_Cmd( DEF_UART2_TX_DMA_CH, ENABLE );
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USART2->CTLR3 |= USART_DMAReq_Tx;
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Cdc.Tx_Flag = 0x01;
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*/
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}
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}
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}
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/*********************************************************************
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* @fn UART2_DataRx_Deal
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*
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* @brief Cdc2 data receiving processing
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*
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* @return none
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*/
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void CDC_DataRx_Process( void )
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{
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// uint16_t temp16;
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// uint32_t remain_len;
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// uint16_t packlen;
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/* Serial port 1 data DMA receive processing */
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NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
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NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
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// process sending data over USB to the host.
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/*
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CDC_Rx_DMACurCount = DEF_UART2_RX_DMA_CH->CNTR;
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if( CDC_Rx_DMALastCount != CDC_Rx_DMACurCount )
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{
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if( CDC_Rx_DMALastCount > CDC_Rx_DMACurCount )
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{
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temp16 = CDC_Rx_DMALastCount - CDC_Rx_DMACurCount;
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}
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else
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{
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temp16 = DEF_CDC_RX_BUF_LEN - CDC_Rx_DMACurCount;
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temp16 += CDC_Rx_DMALastCount;
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}
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CDC_Rx_DMALastCount = CDC_Rx_DMACurCount;
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if( ( Cdc.Rx_RemainLen + temp16 ) > DEF_CDC_RX_BUF_LEN )
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{
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// Overflow handling
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// Save frame error status
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printf("U0_O:%08lx\n",(uint32_t)Cdc.Rx_RemainLen);
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}
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else
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{
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Cdc.Rx_RemainLen += temp16;
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}
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// Setting reception status
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Cdc.Rx_TimeOut = 0x00;
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}
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*/
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NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
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NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
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/*****************************************************************/
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/* Serial port 1 data processing via USB upload and reception */
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if( Cdc.Rx_RemainLen ) {
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if( Cdc.USB_Up_IngFlag == 0 ) {
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// todo: figure out wtf this does.
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/*
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// Calculate the length of this upload
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remain_len = Cdc.Rx_RemainLen;
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packlen = 0x00;
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if( remain_len >= DEF_USBD_MAX_PACK_SIZE ) {
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packlen = DEF_USBD_MAX_PACK_SIZE;
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}
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else {
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if( Cdc.Rx_TimeOut >= Cdc.Rx_TimeOutMax ) {
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packlen = remain_len;
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}
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}
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if( packlen > ( DEF_CDC_RX_BUF_LEN - Cdc.Rx_DealPtr ) ) {
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packlen = ( DEF_CDC_RX_BUF_LEN - Cdc.Rx_DealPtr );
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}
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// Upload serial data via usb
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if( packlen ) {
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NVIC_DisableIRQ( USB_LP_CAN1_RX0_IRQn );
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NVIC_DisableIRQ( USB_HP_CAN1_TX_IRQn );
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Cdc.USB_Up_IngFlag = 0x01;
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Cdc.USB_Up_TimeOut = 0x00;
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USBD_ENDPx_DataUp( ENDP3, &UART2_Rx_Buf[ Cdc.Rx_DealPtr], packlen);
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// Calculate the variables of interest
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Cdc.Rx_RemainLen -= packlen;
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Cdc.Rx_DealPtr += packlen;
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if( Cdc.Rx_DealPtr >= DEF_CDC_RX_BUF_LEN )
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{
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Cdc.Rx_DealPtr = 0x00;
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}
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// Start 0-length packet timeout timer
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if( packlen == DEF_CDC_RX_BUF_LEN )
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{
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Cdc.USB_Up_Pack0_Flag = 0x01;
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}
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NVIC_EnableIRQ( USB_LP_CAN1_RX0_IRQn );
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NVIC_EnableIRQ( USB_HP_CAN1_TX_IRQn );
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}
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*/
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}
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else {
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/* Set the upload success flag directly if the upload is not successful after the timeout */
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if(Cdc.USB_Up_TimeOut >= DEF_CDC_USB_UP_TIMEOUT) {
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Cdc.USB_Up_IngFlag = 0x00;
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USBD_Endp3_Busy = 0;
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}
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}
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}
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/*****************************************************************/
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/* Determine if a 0-length packet needs to be uploaded (required for CDC mode) */
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if( Cdc.USB_Up_Pack0_Flag ) {
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if( Cdc.USB_Up_IngFlag == 0 ) {
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if( Cdc.USB_Up_TimeOut >= ( DEF_CDC_RX_TIMEOUT * 20 ) ) {
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NVIC_DisableIRQ( USB_LP_CAN1_RX0_IRQn );
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NVIC_DisableIRQ( USB_HP_CAN1_TX_IRQn );
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Cdc.USB_Up_IngFlag = 0x01;
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Cdc.USB_Up_TimeOut = 0x00;
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USBD_ENDPx_DataUp( ENDP3, &CDC_Rx_Buf[ Cdc.Rx_DealPtr], 0);
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Cdc.USB_Up_IngFlag = 0;
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Cdc.USB_Up_Pack0_Flag = 0x00;
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NVIC_EnableIRQ( USB_LP_CAN1_RX0_IRQn );
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NVIC_EnableIRQ( USB_HP_CAN1_TX_IRQn );
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}
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}
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}
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}
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