tillitis-key/hw/boards/mta1-usb-v1/ch552_fw/main.c
2023-12-07 17:16:31 +01:00

660 lines
34 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/********************************** (C) COPYRIGHT *******************************
* File Name : CDC.C
* Author : WCH
* Version : V1.0
* Date : 2017/03/01
* Description : CH554 as CDC device to serial port, select serial port 1
*******************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <ch554.h>
#include <ch554_usb.h>
#include <debug.h>
__xdata __at (0x0000) uint8_t Ep0Buffer[DEFAULT_ENDP0_SIZE]; // Endpoint 0 OUT & IN buffer, must be an even address
__xdata __at (0x0040) uint8_t Ep1Buffer[DEFAULT_ENDP1_SIZE]; //Endpoint 1 upload buffer
__xdata __at (0x0080) uint8_t Ep2Buffer[2*MAX_PACKET_SIZE]; //Endpoint 2 IN & OUT buffer, must be an even address
uint16_t SetupLen;
uint8_t SetupReq,Count,UsbConfig;
const uint8_t * pDescr; //USB configuration flag
USB_SETUP_REQ SetupReqBuf; //Temporary Setup package
#define UsbSetupBuf ((PUSB_SETUP_REQ)Ep0Buffer)
#define SET_LINE_CODING 0X20 // Configures DTE rate, stop-bits, parity, and number-of-character
#define GET_LINE_CODING 0X21 // This request allows the host to find out the currently configured line coding.
#define SET_CONTROL_LINE_STATE 0X22 // This request generates RS-232/V.24 style control signals.
/*设备描述符*/
__code uint8_t DevDesc[] = {0x12,0x01,0x10,0x01,0x02,0x00,0x00,DEFAULT_ENDP0_SIZE,
// 0x86,0x1a, // VID
// 0x22,0x57, // PID
0x07,0x12, // VID
0x87,0x88, // PID
0x00,0x01,0x01,0x02,
0x03,0x01
};
__code uint8_t CfgDesc[] ={
0x09,0x02,0x43,0x00,0x02,0x01,0x00,0xa0,0x32, //Configuration descriptor (two interfaces)
// The following is the interface 0 (CDC interface) descriptor
0x09,0x04,0x00,0x00,0x01,0x02,0x02,0x01,0x00, // CDC interface descriptor (one endpoint)
//The following is the function descriptor
0x05,0x24,0x00,0x10,0x01, //Function descriptor (header)
0x05,0x24,0x01,0x00,0x00, //Management descriptor (no data interface) 03 01
0x04,0x24,0x02,0x02, //stand by,Set_Line_Coding、Set_Control_Line_State、Get_Line_Coding、Serial_State
0x05,0x24,0x06,0x00,0x01, //CDC interface numbered 0; data interface numbered 1
0x07,0x05,0x81,0x03,0x08,0x00,0xFF, //Interrupt upload endpoint descriptor
//The following is the interface 1 (data interface) descriptor
0x09,0x04,0x01,0x00,0x02,0x0a,0x00,0x00,0x00, //Data interface descriptor
0x07,0x05,0x02,0x02,0x40,0x00,0x00, //Endpoint descriptor
0x07,0x05,0x82,0x02,0x40,0x00,0x00, //Endpoint descriptor
};
/*字符串描述符*/
unsigned char __code LangDes[]={0x04,0x03,0x09,0x04}; //Language descriptor
#include "usb_strings.h"
//unsigned char __code SerDes[]={ //Serial number string descriptor
// 0x14,0x03,
// 0x32,0x00,0x30,0x00,0x31,0x00,0x37,0x00,0x2D,0x00,
// 0x32,0x00,0x2D,0x00,
// 0x32,0x00,0x35,0x00
// };
//unsigned char __code Prod_Des[]={ //Product string descriptor
// 0x14,0x03,
// 0x43,0x00,0x48,0x00,0x35,0x00,0x35,0x00,0x34,0x00,0x5F,0x00,
// 0x43,0x00,0x44,0x00,0x43,0x00,
// };
//unsigned char __code Manuf_Des[]={
// 0x0A,0x03,
// 0x5F,0x6c,0xCF,0x82,0x81,0x6c,0x52,0x60,
//};
//cdc参数
__xdata uint8_t LineCoding[7]={0x00,0xe1,0x00,0x00,0x00,0x00,0x08}; //The initial baud rate is 57600, 1 stop bit, no parity, 8 data bits.
#define UART_REV_LEN 64 //Serial receive buffer size
__idata uint8_t Receive_Uart_Buf[UART_REV_LEN]; //Serial receive buffer
volatile __idata uint8_t Uart_Input_Point = 0; //Circular buffer write pointer, bus reset needs to be initialized to 0
volatile __idata uint8_t Uart_Output_Point = 0; //Take pointer out of circular buffer, bus reset needs to be initialized to 0
volatile __idata uint8_t UartByteCount = 0; //Number of bytes remaining in the current buffer
volatile __idata uint8_t USBByteCount = 0; //Represents the data received by the USB endpoint
volatile __idata uint8_t USBBufOutPoint = 0; //Fetch data pointer
volatile __idata uint8_t UpPoint2_Busy = 0; //Whether the upload endpoint is busy
/*******************************************************************************
* Function Name : USBDeviceCfg()
* Description : USB device mode configuration
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USBDeviceCfg()
{
USB_CTRL = 0x00; //Clear USB control register
USB_CTRL &= ~bUC_HOST_MODE; //This bit selects the device mode
USB_CTRL |= bUC_DEV_PU_EN | bUC_INT_BUSY | bUC_DMA_EN; //USB device and internal pull-up enable, automatically return to NAK before interrupt flag is cleared
USB_DEV_AD = 0x00; //Device address initialization
// USB_CTRL |= bUC_LOW_SPEED;
// UDEV_CTRL |= bUD_LOW_SPEED; //Select low speed 1.5M mode
USB_CTRL &= ~bUC_LOW_SPEED;
UDEV_CTRL &= ~bUD_LOW_SPEED; //Select full speed 12M mode, the default mode
UDEV_CTRL = bUD_PD_DIS; // Disable DP / DM pull-down resistor
UDEV_CTRL |= bUD_PORT_EN; //Enable physical port
}
/*******************************************************************************
* Function Name : USBDeviceIntCfg()
* Description : USB device mode interrupt initialization
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USBDeviceIntCfg()
{
USB_INT_EN |= bUIE_SUSPEND; //Enable device suspend interrupt
USB_INT_EN |= bUIE_TRANSFER; //Enable USB transfer completion interrupt
USB_INT_EN |= bUIE_BUS_RST; //Enable device mode USB bus reset interrupt
USB_INT_FG |= 0x1F; //Clear interrupt flag
IE_USB = 1; //Enable USB interrupt
EA = 1; //Allow microcontroller interrupt
}
/*******************************************************************************
* Function Name : USBDeviceEndPointCfg()
* Description : USB device mode endpoint configuration, simulation compatible HID device, in addition to endpoint 0 control transmission, also includes endpoint 2 batch upload
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USBDeviceEndPointCfg()
{
// TODO: Is casting the right thing here? What about endianness?
UEP1_DMA = (uint16_t) Ep1Buffer; //Endpoint 1 sends data transfer address
UEP2_DMA = (uint16_t) Ep2Buffer; //Endpoint 2 IN data transfer address
UEP2_3_MOD = 0xCC; //Endpoint 2/3 single buffer transceiver enable
UEP2_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK | UEP_R_RES_ACK; //Endpoint 2 automatically flips the synchronization flag, IN transaction returns NAK, OUT returns ACK
UEP1_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK; //Endpoint 1 automatically flips the synchronization flag, IN transaction returns NAK
UEP0_DMA = (uint16_t) Ep0Buffer; //Endpoint 0 data transfer address
UEP4_1_MOD = 0X40; //Endpoint 1 upload buffer; endpoint 0 single 64-byte send and receive buffer
UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK; //Manual flip, OUT transaction returns ACK, IN transaction returns NAK
}
/*******************************************************************************
* Function Name : Config_Uart1(uint8_t *cfg_uart)
* Description : Configure serial port 1 parameters
* Input : Serial port configuration parameters Four bit baud rate, stop bit, parity, data bit
* Output : None
* Return : None
*******************************************************************************/
void Config_Uart1(uint8_t *cfg_uart)
{
uint32_t uart1_buad = 0;
*((uint8_t *)&uart1_buad) = cfg_uart[0];
*((uint8_t *)&uart1_buad+1) = cfg_uart[1];
*((uint8_t *)&uart1_buad+2) = cfg_uart[2];
*((uint8_t *)&uart1_buad+3) = cfg_uart[3];
SBAUD1 = 256 - FREQ_SYS/16/uart1_buad; // SBAUD1 = 256 - Fsys / 16 / baud rate
IE_UART1 = 1;
}
/*******************************************************************************
* Function Name : DeviceInterrupt()
* Description : CH559USB interrupt processing function
*******************************************************************************/
void DeviceInterrupt(void) __interrupt (INT_NO_USB) //USB interrupt service routine, using register set 1
{
uint16_t len;
if(UIF_TRANSFER) //USB transfer complete flag
{
switch (USB_INT_ST & (MASK_UIS_TOKEN | MASK_UIS_ENDP))
{
case UIS_TOKEN_IN | 1: //endpoint 1# Endpoint interrupts upload
UEP1_T_LEN = 0;
UEP1_CTRL = UEP1_CTRL & ~ MASK_UEP_T_RES | UEP_T_RES_NAK; //Default answer NAK
break;
case UIS_TOKEN_IN | 2: //endpoint 2# Endpoint bulk upload
{
UEP2_T_LEN = 0; //The pre-used sending length must be cleared
UEP2_CTRL = UEP2_CTRL & ~ MASK_UEP_T_RES | UEP_T_RES_NAK; //Default answer NAK
UpPoint2_Busy = 0; //clear busy flag
}
break;
case UIS_TOKEN_OUT | 2: //endpoint 3# Endpoint batch download
if ( U_TOG_OK ) // Out-of-sync packets will be dropped
{
USBByteCount = USB_RX_LEN; // Grads length of recieved data
UEP2_CTRL = UEP2_CTRL & ~ MASK_UEP_R_RES | UEP_R_RES_NAK; //NAK after receiving a packet of data, the main function finishes processing, and the main function modifies the response mode
}
break;
case UIS_TOKEN_SETUP | 0: //SETUP routine
len = USB_RX_LEN;
if(len == (sizeof(USB_SETUP_REQ)))
{
SetupLen = ((uint16_t)UsbSetupBuf->wLengthH<<8) | (UsbSetupBuf->wLengthL);
len = 0; // Defaults to success and uploading 0 length
SetupReq = UsbSetupBuf->bRequest;
if ( ( UsbSetupBuf->bRequestType & USB_REQ_TYP_MASK ) != USB_REQ_TYP_STANDARD )// non-standard request
{
switch( SetupReq )
{
case GET_LINE_CODING: //0x21 currently configured
pDescr = LineCoding;
len = sizeof(LineCoding);
len = SetupLen >= DEFAULT_ENDP0_SIZE ? DEFAULT_ENDP0_SIZE : SetupLen; // The length of this transmission
memcpy(Ep0Buffer,pDescr,len);
SetupLen -= len;
pDescr += len;
break;
case SET_CONTROL_LINE_STATE: //0x22 generates RS-232/V.24 style control signals
break;
case SET_LINE_CODING: //0x20 Configure
break;
default:
len = 0xFF; /*Command not supported*/
break;
}
}
else //Standard request
{
switch(SetupReq) //Request code
{
case USB_GET_DESCRIPTOR:
switch(UsbSetupBuf->wValueH)
{
case 1: // device descriptor
pDescr = DevDesc; //Send the device descriptor to the buffer to be sent
len = sizeof(DevDesc);
break;
case 2: //configuration descriptor
pDescr = CfgDesc; //Send the device descriptor to the buffer to be sent
len = sizeof(CfgDesc);
break;
case 3:
if(UsbSetupBuf->wValueL == 0)
{
pDescr = LangDes;
len = sizeof(LangDes);
}
else if(UsbSetupBuf->wValueL == 1)
{
pDescr = Manuf_Des;
len = sizeof(Manuf_Des);
}
else if(UsbSetupBuf->wValueL == 2)
{
pDescr = Prod_Des;
len = sizeof(Prod_Des);
}
else
{
pDescr = SerDes;
len = sizeof(SerDes);
}
break;
default:
len = 0xff; //Unsupported command or error
break;
}
if ( SetupLen > len )
{
SetupLen = len; //Limit total length
}
len = SetupLen >= DEFAULT_ENDP0_SIZE ? DEFAULT_ENDP0_SIZE : SetupLen; //This transmission length
memcpy(Ep0Buffer,pDescr,len); //Load upload data
SetupLen -= len;
pDescr += len;
break;
case USB_SET_ADDRESS:
SetupLen = UsbSetupBuf->wValueL; //Temporary storage of USB device address
break;
case USB_GET_CONFIGURATION:
Ep0Buffer[0] = UsbConfig;
if ( SetupLen >= 1 )
{
len = 1;
}
break;
case USB_SET_CONFIGURATION:
UsbConfig = UsbSetupBuf->wValueL;
break;
case USB_GET_INTERFACE:
break;
case USB_CLEAR_FEATURE: //Clear Feature
if( ( UsbSetupBuf->bRequestType & 0x1F ) == USB_REQ_RECIP_DEVICE ) /* Remove device */
{
if( ( ( ( uint16_t )UsbSetupBuf->wValueH << 8 ) | UsbSetupBuf->wValueL ) == 0x01 )
{
if( CfgDesc[ 7 ] & 0x20 )
{
/* Wake */
}
else
{
len = 0xFF; /* operation failed */
}
}
else
{
len = 0xFF; /* operation failed */
}
}
else if ( ( UsbSetupBuf->bRequestType & USB_REQ_RECIP_MASK ) == USB_REQ_RECIP_ENDP )// endpoint
{
switch( UsbSetupBuf->wIndexL )
{
case 0x83:
UEP3_CTRL = UEP3_CTRL & ~ ( bUEP_T_TOG | MASK_UEP_T_RES ) | UEP_T_RES_NAK;
break;
case 0x03:
UEP3_CTRL = UEP3_CTRL & ~ ( bUEP_R_TOG | MASK_UEP_R_RES ) | UEP_R_RES_ACK;
break;
case 0x82:
UEP2_CTRL = UEP2_CTRL & ~ ( bUEP_T_TOG | MASK_UEP_T_RES ) | UEP_T_RES_NAK;
break;
case 0x02:
UEP2_CTRL = UEP2_CTRL & ~ ( bUEP_R_TOG | MASK_UEP_R_RES ) | UEP_R_RES_ACK;
break;
case 0x81:
UEP1_CTRL = UEP1_CTRL & ~ ( bUEP_T_TOG | MASK_UEP_T_RES ) | UEP_T_RES_NAK;
break;
case 0x01:
UEP1_CTRL = UEP1_CTRL & ~ ( bUEP_R_TOG | MASK_UEP_R_RES ) | UEP_R_RES_ACK;
break;
default:
len = 0xFF; // Unsupported endpoint
break;
}
}
else
{
len = 0xFF; // It's not that the endpoint doesn't support it
}
break;
case USB_SET_FEATURE: /* Set Feature */
if( ( UsbSetupBuf->bRequestType & 0x1F ) == USB_REQ_RECIP_DEVICE ) /* Set up the device */
{
if( ( ( ( uint16_t )UsbSetupBuf->wValueH << 8 ) | UsbSetupBuf->wValueL ) == 0x01 )
{
if( CfgDesc[ 7 ] & 0x20 )
{
/* hibernate */
#ifdef DE_PRINTF
printf( "suspend\n" ); //sleep state
#endif
while ( XBUS_AUX & bUART0_TX )
{
; //等待发送完成
}
SAFE_MOD = 0x55;
SAFE_MOD = 0xAA;
WAKE_CTRL = bWAK_BY_USB | bWAK_RXD0_LO | bWAK_RXD1_LO; //USB or RXD0/1 can be woken up when there is a signal
PCON |= PD; // sleep
SAFE_MOD = 0x55;
SAFE_MOD = 0xAA;
WAKE_CTRL = 0x00;
}
else
{
len = 0xFF; /* operation failed */
}
}
else
{
len = 0xFF; /* operation failed */
}
}
else if( ( UsbSetupBuf->bRequestType & 0x1F ) == USB_REQ_RECIP_ENDP ) /* Set endpoint */
{
if( ( ( ( uint16_t )UsbSetupBuf->wValueH << 8 ) | UsbSetupBuf->wValueL ) == 0x00 )
{
switch( ( ( uint16_t )UsbSetupBuf->wIndexH << 8 ) | UsbSetupBuf->wIndexL )
{
case 0x83:
UEP3_CTRL = UEP3_CTRL & (~bUEP_T_TOG) | UEP_T_RES_STALL;/* Set endpoint 3 IN STALL */
break;
case 0x03:
UEP3_CTRL = UEP3_CTRL & (~bUEP_R_TOG) | UEP_R_RES_STALL;/* Set endpoint 3 OUT Stall */
break;
case 0x82:
UEP2_CTRL = UEP2_CTRL & (~bUEP_T_TOG) | UEP_T_RES_STALL;/* Set endpoint 2 IN STALL */
break;
case 0x02:
UEP2_CTRL = UEP2_CTRL & (~bUEP_R_TOG) | UEP_R_RES_STALL;/* Set endpoint 2 OUT Stall */
break;
case 0x81:
UEP1_CTRL = UEP1_CTRL & (~bUEP_T_TOG) | UEP_T_RES_STALL;/* Set endpoint 1 IN STALL */
break;
case 0x01:
UEP1_CTRL = UEP1_CTRL & (~bUEP_R_TOG) | UEP_R_RES_STALL;/* Set endpoint 1 OUT Stall */
default:
len = 0xFF; /* operation failed */
break;
}
}
else
{
len = 0xFF; /* operation failed */
}
}
else
{
len = 0xFF; /* operation failed */
}
break;
case USB_GET_STATUS:
Ep0Buffer[0] = 0x00;
Ep0Buffer[1] = 0x00;
if ( SetupLen >= 2 )
{
len = 2;
}
else
{
len = SetupLen;
}
break;
default:
len = 0xff; //operation failed
break;
}
}
}
else
{
len = 0xff; //Packet length error
}
if(len == 0xff)
{
SetupReq = 0xFF;
UEP0_CTRL = bUEP_R_TOG | bUEP_T_TOG | UEP_R_RES_STALL | UEP_T_RES_STALL;//STALL
}
else if(len <= DEFAULT_ENDP0_SIZE) //Upload data or status phase returns 0 length packet
{
UEP0_T_LEN = len;
UEP0_CTRL = bUEP_R_TOG | bUEP_T_TOG | UEP_R_RES_ACK | UEP_T_RES_ACK;//The default packet is DATA1Return response ACK
}
else
{
UEP0_T_LEN = 0; //Although it has not yet reached the status stage, it is preset to upload 0-length data packets in advance to prevent the host from entering the status stage early.
UEP0_CTRL = bUEP_R_TOG | bUEP_T_TOG | UEP_R_RES_ACK | UEP_T_RES_ACK; //The default data packet is DATA1, and the response ACK is returned
}
break;
case UIS_TOKEN_IN | 0: //endpoint0 IN
switch(SetupReq)
{
case USB_GET_DESCRIPTOR:
len = SetupLen >= DEFAULT_ENDP0_SIZE ? DEFAULT_ENDP0_SIZE : SetupLen; //The length of this transmission
memcpy( Ep0Buffer, pDescr, len ); //Load upload data
SetupLen -= len;
pDescr += len;
UEP0_T_LEN = len;
UEP0_CTRL ^= bUEP_T_TOG; //Sync flag flip
break;
case USB_SET_ADDRESS:
USB_DEV_AD = USB_DEV_AD & bUDA_GP_BIT | SetupLen;
UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
break;
default:
UEP0_T_LEN = 0; //The status phase is completed and interrupted or the 0-length data packet is forced to be uploaded to end the control transmission.
UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
break;
}
break;
case UIS_TOKEN_OUT | 0: // endpoint0 OUT
if(SetupReq ==SET_LINE_CODING) // Set serial port properties
{
if( U_TOG_OK )
{
memcpy(LineCoding,UsbSetupBuf,USB_RX_LEN);
Config_Uart1(LineCoding);
UEP0_T_LEN = 0;
UEP0_CTRL |= UEP_R_RES_ACK | UEP_T_RES_ACK; // Prepare to upload 0 packages
}
}
else
{
UEP0_T_LEN = 0;
UEP0_CTRL |= UEP_R_RES_ACK | UEP_T_RES_NAK; // Status phase, responds to IN with NAK
}
break;
default:
break;
}
UIF_TRANSFER = 0; //Writing 0 clears the interrupt
}
if(UIF_BUS_RST) //Device mode USB bus reset interrupt
{
#ifdef DE_PRINTF
printf( "reset\n" ); //sleep state
#endif
UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
UEP1_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK;
UEP2_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK | UEP_R_RES_ACK;
USB_DEV_AD = 0x00;
UIF_SUSPEND = 0;
UIF_TRANSFER = 0;
UIF_BUS_RST = 0; //clear interrupt flag
Uart_Input_Point = 0; //Circular buffer input pointer
Uart_Output_Point = 0; //Circular buffer read pointer
UartByteCount = 0; //The number of bytes remaining in the current buffer to be fetched
USBByteCount = 0; //USB endpoint received length
UsbConfig = 0; //Clear configuration values
UpPoint2_Busy = 0;
}
if (UIF_SUSPEND) //USB bus suspend/wake completed
{
UIF_SUSPEND = 0;
if ( USB_MIS_ST & bUMS_SUSPEND ) //hang
{
#ifdef DE_PRINTF
printf( "suspend\n" ); //sleep state
#endif
while ( XBUS_AUX & bUART0_TX )
{
; //Wait for sending to complete
}
SAFE_MOD = 0x55;
SAFE_MOD = 0xAA;
WAKE_CTRL = bWAK_BY_USB | bWAK_RXD0_LO | bWAK_RXD1_LO; //Can be woken up when there is a signal from USB or RXD0/1
PCON |= PD; //sleep
SAFE_MOD = 0x55;
SAFE_MOD = 0xAA;
WAKE_CTRL = 0x00;
}
}
else { //Unexpected interruption, impossible situation
USB_INT_FG = 0xFF; //clear interrupt flag
}
}
/*******************************************************************************
* Function Name : Uart1_ISR()
* Description : Serial port receiving interrupt function to realize circular buffer receiving
*******************************************************************************/
void Uart1_ISR(void) __interrupt (INT_NO_UART1)
{
if(U1RI) //data received
{
Receive_Uart_Buf[Uart_Input_Point++] = SBUF1;
if(Uart_Input_Point>=UART_REV_LEN) {
Uart_Input_Point = 0; //Write pointer
}
U1RI = 0;
}
}
uint8_t uart_byte_count() {
uint8_t in = Uart_Input_Point;
uint8_t out = Uart_Output_Point;
if (in < out) {
in = in + UART_REV_LEN;
}
return in - out;
}
//main function
main()
{
uint8_t length;
uint8_t Uart_Timeout = 0;
uint8_t USB_output_buffer[64] = {0};
uint8_t USB_output_buffer_remain = 0;
CfgFsys( ); // CH559 clock selection configuration
mDelaymS(5); // Modify the main frequency and wait for the internal crystal to stabilize, which must be added
mInitSTDIO( ); // Serial port 0, can be used for debugging
UART1Setup( ); // For CDC
#ifdef DE_PRINTF
printf("start ...\n");
#endif
USBDeviceCfg();
USBDeviceEndPointCfg(); // Endpoint configuration
USBDeviceIntCfg(); //Interrupt initialization
UEP0_T_LEN = 0;
UEP1_T_LEN = 0; //Pre-use send length must be cleared
UEP2_T_LEN = 0; //Pre-use send length must be cleared
// Enable GPIO debugging on p1.4 and p1.5
// gpio_init();
// gpio_unset(0x10);
// gpio_unset(0x20);
while(1)
{
if(UsbConfig)
{
if(USBByteCount) // USB receiving endpoint has data
{
memcpy(USB_output_buffer, Ep2Buffer, USBByteCount);
USB_output_buffer_remain = USBByteCount;
USBBufOutPoint = 0;
USBByteCount = 0;
}
if(USB_output_buffer_remain)
{
CH554UART1SendByte(USB_output_buffer[USBBufOutPoint++]);
USB_output_buffer_remain--;
if(USB_output_buffer_remain==0) {
UEP2_CTRL = UEP2_CTRL & ~ MASK_UEP_R_RES | UEP_R_RES_ACK;
}
}
UartByteCount = uart_byte_count();
if(UartByteCount) {
Uart_Timeout++;
}
if(!UpPoint2_Busy) // The endpoint is not busy (the first packet of data after idle, only used to trigger upload)
{
length = UartByteCount;
if(length>0)
{
if(length>39 || Uart_Timeout>100)
{
Uart_Timeout = 0;
// if we reach a wrap-around, just transmit from index to end of buffer.
// The rest goes in next packet, i.e., not handling wrap-around.
if(Uart_Output_Point+length>UART_REV_LEN) {
length = UART_REV_LEN-Uart_Output_Point;
}
// write upload endpoint
memcpy(Ep2Buffer+MAX_PACKET_SIZE,&Receive_Uart_Buf[Uart_Output_Point],length);
Uart_Output_Point+=length;
if (Uart_Output_Point>=UART_REV_LEN) {
Uart_Output_Point = 0;
}
UEP2_T_LEN = length; // Pre-use send length must be cleared
UEP2_CTRL = UEP2_CTRL & ~ MASK_UEP_T_RES | UEP_T_RES_ACK; // Answer ACK
UpPoint2_Busy = 1;
// Should according to the USB-spec check if
// length == 64, if so we should send a
// zero-length USB packet. This is very
// unlikley to happen.
}
}
}
// Should have a timeout if the transfer for some reason
// fails to reset UpPoint2_Busy. But does not seem to
// happen.
}
}
}