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sc8-gat-stand/gat_stand_fw/user/usb/cdc.c

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