usb_ep0.c

#include "usb_desc.h"
#include "usb_endp.h"
#include "usb_cdc.h"
#include <string.h>	// For memcpy()

#include "bootloader.h"
#include "ch554_platform.h"

// Used in SET_FEATURE and CLEAR_FEATURE 
#define USB_FEATURE_ENDPOINT_HALT 0						// Endpoint only
#define USB_FEATURE_DEVICE_REMOTE_WAKEUP 1		// Device only

#define USB_ENDP0_SIZE         DEFAULT_ENDP0_SIZE

// The buffer (Tx and Rx) must have an even address, size: 10 (0x0A)
xdatabuf(EP0_ADDR, Ep0Buffer, 8 > (USB_ENDP0_SIZE + 2) ? 8 : (USB_ENDP0_SIZE + 2));

#define UsbSetupBuf ((PUSB_SETUP_REQ)Ep0Buffer)

uint8_t   SetupReq, SetupLen, UsbConfig;
uint8_t*  pDescr;

// Process SETUP packet
void USB_EP0_SETUP(void) {
	uint8_t len = USB_RX_LEN;
	if (len == (sizeof(USB_SETUP_REQ))) {
		SetupLen = UsbSetupBuf->wLengthL;
		if (UsbSetupBuf->wLengthH || SetupLen > 0x7F)
			SetupLen = 0x7F;	// Limit the total length

		len = 0;	// Assume success -> Tx 0-length packet
		SetupReq = UsbSetupBuf->bRequest;

		if ((UsbSetupBuf->bRequestType & USB_REQ_TYP_MASK) == USB_REQ_TYP_STANDARD) {
			// Standard USB Request
			switch (SetupReq) {
			case USB_GET_DESCRIPTOR:
				switch (UsbSetupBuf->wValueH) {
				case 1:												// Device Descriptor
					pDescr = (uint8_t*)&DevDesc;
					len = USB_DESCSIZE_DEVICE;
					break;
				case 2:												// Configure Descriptor
					pDescr = (uint8_t*)CfgDesc;
					len = (USB_DESCSIZE_CONFIG_H << 8) | USB_DESCSIZE_CONFIG_L;
					break;
				case 3:												// String Descriptor
					len = UsbSetupBuf->wValueL;	// Index
					if (len < USB_STRINGDESC_COUNT) {
						pDescr = (uint8_t*)(StringDescs[len]);
						len = pDescr[0];
					} else {
						len = 0xFF;								// Not supported
					}
					break;
				case 0x22:										// Report Descriptor
					len = UsbSetupBuf->wIndexL;
					if (len < USB_INTERFACES) {
						
						//pDescr = USB_HID_GetReportDesc(len);
						//len = USB_HID_GetReportDesc_Length(len);
					} else {
						len = 0xff;		// The host is trying to config invalid interfaces
					}
					break;
				default:
					len = 0xff;		// Unsupported descriptors
					break;
				}	// switch (UsbSetupBuf->wValueH)
				if (SetupLen > len) {
					SetupLen = len;		// Limit length
				}
				len = SetupLen >= 8 ? 8 : SetupLen;
				memcpy(Ep0Buffer, pDescr, len);
				SetupLen -= len;
				pDescr += len;
				break;
			case USB_SET_ADDRESS:
				SetupLen = UsbSetupBuf->wValueL;	// Save the assigned address
				break;
			case USB_GET_CONFIGURATION:
				Ep0Buffer[0] = UsbConfig;
				if (SetupLen >= 1)
					len = 1;
				break;
			case USB_SET_CONFIGURATION:
				UsbConfig = UsbSetupBuf->wValueL;
				break;
			case 0x0A:
				break;
			case USB_CLEAR_FEATURE:                                            //Clear Feature
				if ((UsbSetupBuf->bRequestType & USB_REQ_RECIP_MASK) == USB_REQ_RECIP_ENDP) {	// Endpoint
					len = USB_EP_HALT_CLEAR(UsbSetupBuf->wIndexL);
				} else {
					len = 0xFF;			// Unsupported
				}
				break;
			case USB_SET_FEATURE:                                              /* Set Feature */
				if ((UsbSetupBuf->bRequestType & USB_REQ_RECIP_MASK) == USB_REQ_RECIP_ENDP) { // Endpoint
					if ((((uint16_t)UsbSetupBuf->wValueH << 8) | UsbSetupBuf->wValueL) == USB_FEATURE_ENDPOINT_HALT) {
						len = USB_EP_HALT_SET(UsbSetupBuf->wIndexL);
					} else {
						len = 0xFF;		// Unsupported
					}	// if ((((UINT16)UsbSetupBuf->wValueH << 8) | UsbSetupBuf->wValueL) == 0x00)
				}	else {
					len = 0xFF;			// Unsupported
				}
				break;
			case USB_GET_STATUS:
				// Device Status Bits:
				// D0 1=Self-Powered 0=Bus-powered
				// D1 1=Support remote wakeup
				// D2-D15 Reserved, must be 0
				//
				// Interface Status Bits:
				// All reserved, must be 0
				// 
				// Endpoint Status Bits:
				// D0 1=Endpoint is halted
				// D1-D15 Reserved, must be 0
				Ep0Buffer[0] = 0x00;
				Ep0Buffer[1] = 0x00;
				if (SetupLen >= 2) {
					len = 2;
				} else {
					len = SetupLen;
				}
				break;
			default:
				len = 0xff;				// Unsupported
				break;
			}	// switch (SetupReq)
		}	// if ((UsbSetupBuf->bRequestType & USB_REQ_TYP_MASK) == USB_REQ_TYP_STANDARD)
		
		else if ((UsbSetupBuf->bRequestType & USB_REQ_TYP_MASK) == USB_REQ_TYP_CLASS) {
			// USB CDC
			if (UsbSetupBuf->bRequestType & USB_REQ_TYP_IN) {
				// Device -> Host
				switch( SetupReq ) {
					//case SERIAL_STATE:   //0x20
						// Return CTS DTR state
						// Return format: bit4:0 [RING BREAK DSR DCD]
						//break;
					case GET_LINE_CODING:   //0x21  currently configured
						pDescr = LineCoding;
						len = LINECODING_SIZE;
						len = SetupLen >= DEFAULT_ENDP0_SIZE ? DEFAULT_ENDP0_SIZE : SetupLen;  // 本次传输长度
						memcpy(Ep0Buffer, pDescr, len);
						SetupLen -= len;
						pDescr += len;
						break;
					default:
						len = 0xFF;
						break;
				}
			} else {	// USB_REQ_TYP_OUT
				// Host -> Device
				switch( SetupReq ) {
					case SET_LINE_CODING: //0x20
						break;
					case SET_CONTROL_LINE_STATE:  //0x22  generates RS-232/V.24 style control signals
						// 0x00 0x0[0 0 RTS DTR]
						break;
					//case SEND_BREAK:
						//break;
					default:
						len = 0xFF;
						break;
				}
			}
		} // else if ((UsbSetupBuf->bRequestType & USB_REQ_TYP_MASK) == USB_REQ_TYP_CLASS)
		
		// Process class requests and vendor requests here (if necessary)
	} else {
		len = 0xff;						// Wrong packet length
	}	// if (len == (sizeof(USB_SETUP_REQ)))
	
	
	//Responce
	if (len == 0xff) {	// Return STALL to host if operation is not supported
		SetupReq = 0xFF;
		UEP0_CTRL = bUEP_R_TOG | bUEP_T_TOG | UEP_R_RES_STALL | UEP_T_RES_STALL;//STALL
	} else {	// Tx data to host or send 0-length packet
		UEP0_T_LEN = len;
		UEP0_CTRL = bUEP_R_TOG | bUEP_T_TOG | UEP_R_RES_ACK | UEP_T_RES_ACK;	// Expect DATA1, Answer ACK
	}
}

// Process IN packet
void USB_EP0_IN(void) {
	uint8_t len = 0;
	switch (SetupReq)
	{
	case USB_GET_DESCRIPTOR:
		len = SetupLen >= 8 ? 8 : SetupLen;		// Fix length
		memcpy(Ep0Buffer, pDescr, len);			// Copy data to Ep0Buffer, ready to Tx
		SetupLen -= len;
		pDescr += len;
		UEP0_T_LEN = len;
		UEP0_CTRL ^= bUEP_T_TOG;				// Switch between DATA0 and DATA1
		break;
	case USB_SET_ADDRESS:
		USB_DEV_AD = bUDA_GP_BIT | SetupLen;
		UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
		break;
	default:
		UEP0_T_LEN = 0;							// End of transaction
		UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
		break;
	}
}

// Process OUT packet
void USB_EP0_OUT(void) {
	uint8_t len = USB_RX_LEN;
	if (SetupReq == SET_LINE_CODING) {
		if( U_TOG_OK ) {
			memcpy(LineCoding,UsbSetupBuf,USB_RX_LEN);
			CDC_SetBaud();

			UEP0_T_LEN = 0;
			UEP0_CTRL |= UEP_R_RES_ACK | UEP_T_RES_ACK;  // 准备上传0包
		}
	}

	UEP0_CTRL ^= bUEP_R_TOG;	// Switch between DATA0 and DATA1	
}