MAINLOOP.C:
#include <stdio.h>
#include <string.h>

#include <reg51.h>                /* special function register declarations   */

#include "epphal.h"
#include "d12ci.h"
#include "mainloop.h"
#include "usb100.h"
#include "chap_9.h"
#include "protodma.h"

/*
//*************************************************************************
// USB protocol function pointer arrays
//*************************************************************************
*/
//USB標準請求
code void (*StandardDeviceRequest[])(void) =
{
	get_status,
	clear_feature,
	reserved,
	set_feature,
	reserved,
	set_address,
	get_descriptor,
	reserved,
	get_configuration,
	set_configuration,
	get_interface,
	set_interface,
	reserved,
	reserved,
	reserved,
	reserved
};

//用戶廠商請求
code void (*VendorDeviceRequest[])(void) =
{
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	read_write_register,
	cortrol_led,
	reserved,
	reserved
};

/*
//*************************************************************************
//  Public static data
//*************************************************************************
*/

extern EPPFLAGS bEPPflags;
extern unsigned long ClockTicks;
extern unsigned char idata GenEpBuf[];
extern IO_REQUEST idata ioRequest;

extern unsigned char ioSize, ioCount;
extern unsigned char idata EpBuf[];
extern unsigned char idata mainbuflen;

CONTROL_XFER ControlData;
BOOL bNoRAM;

code char * _NAME_USB_REQUEST_DIRECTION[] =
{
"Host_to_device",
"Device_to_host"
};

code char * _NAME_USB_REQUEST_RECIPIENT[] =
{
"Device",
"Interface",
"Endpoint(0)",
"Other"
};

code char * _NAME_USB_REQUEST_TYPE[] =
{
"Standard",
"Class",
"Vendor",
"Reserved"
};

code char * _NAME_USB_STANDARD_REQUEST[] =
{
"GET_STATUS",
"CLEAR_FEATURE",
"RESERVED",
"SET_FEATURE",
"RESERVED",
"SET_ADDRESS",
"GET_DESCRIPTOR",
"SET_DESCRIPTOR",
"GET_CONFIGURATION",
"SET_CONFIGURATION",
"GET_INTERFACE",
"SET_INTERFACE",
"SYNC_FRAME"
};


void help_devreq(unsigned char typ, unsigned char req)
{
	typ >>= 5;

	if(typ == USB_STANDARD_REQUEST) {
	}
	else {
		if(bEPPflags.bits.verbose)
			printf("Request Type = %s, bRequest = 0x%bx.\n", _NAME_USB_REQUEST_TYPE[typ],
				req);
	}
}


//定時器0初始化程序
//定時器用來定時檢測按鍵狀態
void init_timer0(void)
{
	TMOD &= 0XF0;                    /* clear Timer 0   */
	TMOD  |= 0X1;
	TL0 = 0X0;                   /* value set by user    */
	TH0 = 0X0;                  /* value set by user  */
	ET0 = 1;        /* IE.1*/
	TR0 = 1;                /* TCON.4 start timer  */
	PT0 = 1;

	EA = 1;
}


//中斷設置
void init_special_interrupts(void)
{
	IT0 = 0;
	EX0 = 1;
	PX0 = 0;
}

//I/O口初始化程序
void init_port()
{
	P0 = 0xFF;
	P1 = 0xFF;
	P2 = 0xFF;
	P3 = 0xFF;
}

void main(void)
{
	init_port();//初始化I/O口
	init_timer0();//初始化定時器0
	init_special_interrupts();//設置中斷



	D12_ReadChipID();


	bEPPflags.value = 0;
	reconnect_USB();//重新連接USB
init7920();


ClrPic(0,0,0,0);

DisPic(bmp,0,0);
//DisString(tempdst,sizeof(tempdst));
	/* Main program loop */

	while( TRUE ){

		if (bEPPflags.bits.timer){
			DISABLE;//定時器溢出,檢測按鍵狀態
			bEPPflags.bits.timer = 0;
			ENABLE;

			if(bEPPflags.bits.configuration)//設備未配置返回
				check_key_LED();
		}


		if (bEPPflags.bits.bus_reset) {//設備復位處理
			DISABLE;
			bEPPflags.bits.bus_reset = 0;
			ENABLE;
		
		} // if bus reset

	

		if (bEPPflags.bits.setup_packet){//Setup包處理
			DISABLE;
			bEPPflags.bits.setup_packet = 0;
			ENABLE;
			control_handler();//調用請求處理子程序

		} // if setup_packet

		if(bEPPflags.bits.main_rxdone)			//傳輸字符請求
		{
			DISABLE;
			bEPPflags.bits.main_rxdone=0;
			ENABLE;

			DisString(EpBuf,mainbuflen);
			
		} //if main_rxdone
	} // Main Loop
}

//返回stall應答
void stall_ep0(void)
{
	D12_SetEndpointStatus(0, 1);
	D12_SetEndpointStatus(1, 1);
}

//斷開USB總線
void disconnect_USB(void)
{
	// Initialize D12 configuration
	D12_SetMode(D12_NOLAZYCLOCK, D12_SETTOONE | D12_CLOCK_12M);
}

//連接USB總線
void connect_USB(void)
{
	// reset event flags
	DISABLE;
	bEPPflags.value = 0;//清除所有狀態
	ENABLE;

	// V2.1 enable normal+sof interrupt
	D12_SetDMA(D12_ENDP4INTENABLE | D12_ENDP5INTENABLE);

	// Initialize D12 configuration
	D12_SetMode(D12_NOLAZYCLOCK|D12_SOFTCONNECT, D12_SETTOONE | D12_CLOCK_12M);
}

//重新連接到USB總線
void reconnect_USB(void)
{
	unsigned long clk_cnt;

	MCU_LED0 = 0;
	MCU_LED1 = 0;

	// Pull-down D12's SUSPEND pin
	// Disable 74HCT123 pulse generation before disconnect
	// Release D12's SUSPEND pin after receiving bus reset from host

	disconnect_USB();



	clk_cnt = ClockTicks;
	while(ClockTicks < clk_cnt + 20)
		;

	connect_USB();

}

//恢復到未配置狀態
void init_unconfig(void)
{
//	unsigned char i;

	D12_SetEndpointEnable(0);	/* Disable all endpoints but EPP0. */
}

//設置配置狀態
void init_config(void)
{
	D12_SetEndpointEnable(1);	/* Enable  generic/iso endpoints. */
}

//從端點號1發送數據
void single_transmit(unsigned char * buf, unsigned char len)
{
	if( len <= EP0_PACKET_SIZE) {
		D12_WriteEndpoint(1, len, buf);
	}
}

//發送端點號1建立代碼
void code_transmit(unsigned char code * pRomData, unsigned short len)
{
	ControlData.wCount = 0;
	if(ControlData.wLength > len)
		ControlData.wLength = len;

	ControlData.pData = pRomData;
	if( ControlData.wLength >= EP0_PACKET_SIZE) {
		D12_WriteEndpoint(1, EP0_PACKET_SIZE, ControlData.pData);//發送16字節數據
		ControlData.wCount += EP0_PACKET_SIZE;
		DISABLE;
		bEPPflags.bits.control_state = USB_TRANSMIT;
		ENABLE;
	}
	else {
		D12_WriteEndpoint(1, ControlData.wLength, pRomData);//發送16字節內數據
		ControlData.wCount += ControlData.wLength;
		DISABLE;
		bEPPflags.bits.control_state = USB_IDLE;
		ENABLE;
	}
}

//LED和按鍵處理子程序
void check_key_LED(void)
{
	static unsigned char c, last_key = 0xf;

	c =P1&0x0f;
//	if (c != last_key) 
	{
		D12_WriteEndpoint(5, 1, &c);//發送按鍵狀態
		
	}

}

//請求處理子程序
void control_handler()
{
	unsigned char type, req;

	type = ControlData.DeviceRequest.bmRequestType & USB_REQUEST_TYPE_MASK;
	req = ControlData.DeviceRequest.bRequest & USB_REQUEST_MASK;

	help_devreq(type, req); //顯示設備請求

	if (type == USB_STANDARD_REQUEST)
		(*StandardDeviceRequest[req])();//調用標準請求
	else if (type == USB_VENDOR_REQUEST)
		(*VendorDeviceRequest[req])();//調用廠商請求
	else
		stall_ep0();