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

373 lines
10 KiB
C

/*
* 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_from[DEF_CDC_FROM_HOST_BUF_LEN]; /* Serial port 2 transmit data buffer */
__attribute__((aligned(4))) uint8_t cdc_send[DEF_CDC_SEND_HOST_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 CDC_ParaInit
*
* @brief UART 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_FROM_HOST_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;
*/
Cdc.send_host_ptr = 0;
Cdc.send_host_idx = 0;
Cdc.send_host_count = 0;
if (mode) {
Cdc.cdc_cfg[ 0 ] = (uint8_t)( DEF_CDC_BAUDRATE );
Cdc.cdc_cfg[ 1 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 8 );
Cdc.cdc_cfg[ 2 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 16 );
Cdc.cdc_cfg[ 3 ] = (uint8_t)( DEF_CDC_BAUDRATE >> 24 );
Cdc.cdc_cfg[ 4 ] = DEF_CDC_STOPBIT;
Cdc.cdc_cfg[ 5 ] = DEF_CDC_PARITY;
Cdc.cdc_cfg[ 6 ] = DEF_CDC_DATABIT;
}
}
/*********************************************************************
* @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.cdc_cfg[ 3 ] << 24 ) + ( uint32_t )( Cdc.cdc_cfg[ 2 ] << 16 );
baudrate += ( uint32_t )( Cdc.cdc_cfg[ 1 ] << 8 ) + ( uint32_t )( Cdc.cdc_cfg[ 0 ] );
stopbits = Cdc.cdc_cfg[ 4 ];
parity = Cdc.cdc_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_from_host_process(void)
{
// uint16_t count;
if(Cdc.from_host_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_FROM_HOST_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_PACKET_LEN );
}
// 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.from_host_flag = 0x01;
}
*/
}
}
/*********************************************************************
* @fn UART2_DataRx_Deal
*
* @brief Cdc2 data receiving processing
*
* @return none
*/
void cdc_send_host_process(void)
{
uint16_t remain;
uint16_t len;
// process sending data over USB to the host.
if (Cdc.send_host_count) {
if (!Cdc.usb_send_flag) {
// Calculate the length of this transmission
remain = Cdc.send_host_count;
if (remain >= DEF_USBD_MAX_PACK_SIZE ) {
len = DEF_USBD_MAX_PACK_SIZE;
} else {
len = remain;
}
// only send end of buffer if we need to loop it
if (len > (DEF_CDC_SEND_HOST_BUF_LEN - Cdc.send_host_idx)) {
len = (DEF_CDC_SEND_HOST_BUF_LEN - Cdc.send_host_idx);
}
// send data via usb
if (len) {
Cdc.usb_send_flag = 1;
// disable interrupts while configuring
NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
USBD_ENDPx_DataUp(ENDP3, &cdc_send[Cdc.send_host_idx], len);
// calculate new pointer locations
Cdc.send_host_count -= len;
Cdc.send_host_idx += len;
// reset send pointer to beginning of buffer on overflow
if (Cdc.send_host_idx >= DEF_CDC_SEND_HOST_BUF_LEN) {
Cdc.send_host_idx = 0;
}
// re-enable interrupts
NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
}
}
else {
// this is where we could handle a timeout and reset, but ...
}
}
/*****************************************************************/
/* Determine if a 0-length packet needs to be uploaded (required for CDC mode)
* todo: figure out wtf this is about */
/*
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 );
}
}
}
*/
}
int usb_cdc_puts(char *buf, int cnt)
{
int remain;
// no overflowing the buffer
// note: you can overflow on consecutive writes, be careful...
if (cnt > DEF_CDC_SEND_HOST_BUF_LEN) {
return 0;
}
remain = cnt;
if (cnt >= DEF_CDC_SEND_HOST_BUF_LEN - Cdc.send_host_ptr) {
// if we've got too much data, then copy what will fit to end of buffer
remain = DEF_CDC_SEND_HOST_BUF_LEN - Cdc.send_host_ptr;
memcpy(cdc_send + Cdc.send_host_ptr, buf, remain);
// set pointers
Cdc.send_host_ptr = 0;
buf += remain;
remain = cnt - remain;
}
// fill the buffer
memcpy(cdc_send + Cdc.send_host_ptr, buf, remain);
return cnt;
}
int usb_cdc_gets(char *buf, int cnt)
{
uint16_t idx = Cdc.from_host_idx;
uint16_t len = 0;
// can only get data if a length is requested
if (!cnt) {
return 0;
}
// there is no data to actually get
if (idx == Cdc.from_host_ptr) {
return 0;
}
for (len = 0; len < cnt; len++) {
*buf = cdc_from[idx];
buf++;
idx++;
if (idx >= DEF_CDC_FROM_HOST_BUF_LEN) {
idx = 0;
}
if (idx == Cdc.from_host_ptr) {
break;
}
}
Cdc.from_host_idx = idx;
return len;
}
__attribute__((interrupt("WCH-Interrupt-fast")))
void TIM4_IRQHandler(void)
{
// uart timeout counts
//Cdc.Rx_TimeOut++;
//Cdc.USB_Up_TimeOut++;
// clear status
TIM4->INTFR = (uint16_t)~TIM_IT_Update;
}