mainloop.c

本源码实现了５１单片机与飞利浦公司的Ｄ１２ＵＳＢ接口芯片的固件编程．

#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标准请求
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
};

//用户厂商请求
code void (*VendorDeviceRequest[])(void) =
{
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	reserved,
	read_write_register,
	reserved,
	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[];

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);
	}
}

/* Configure Timer 0
   - Mode                  = 1
   - Interrupt                   = ENABLED
   - Clock Source                = INTERNAL
   - Enable Gating Control    = DISABLED
*/
//定时器0初始化程序
//定时器用来定时检测按键状态
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;
}

/* Interrupt Control Unit */
/*   ****  Enabled interrupts in Interrupt Enable Register ****
	 ****  GLOBAL INTERRUPT MUST BE ENABLED FOR ANY OTHER
	 ****  INTERRUPT TO WORK!
*/
/*                  GLOBAL INTERRUPT DISABLED ALL INTERRUPTS
					ARE DISABLED          */
/*                    External interrupt 0      */
/*                        Priority Level = 0    */
/*                        Timer 0 interrupt     */
/*                       Priority Level = 0     */
//中断设置
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;
	MCU_D12CS = 0x0;
	D12SUSPD = 0;
}

/*Serial Port */
/*Mode            = 1  /8-bit UART
  Serial Port Interrupt    = Disabled         */
/*Receive         = Enabled   */
/*Auto Addressing    = Disabled   */
//串行口设置
void init_serial(void)
{
	SCON = 0X52;
	PCON = 0X80 | PCON;
	TMOD = 0X20;
	TCON = 0x69;    // TCON 
	TH1 = 0xF3;
}


void main(void)
{
	unsigned char key, i;

	init_port();//初始化I/O口
	init_serial();//初始化串行口
	//注:串行口是用来外扩LCD和键盘,用于查询显示当前的工作状态
	//在USB Smart Board标准配置中并未带该LCD和键盘,这里给出的程序仅供参考

	init_timer0();//初始化定时器0
	init_special_interrupts();//设置中断

	MCU_D12CS = 0x1;
	
	MCU_D12CS = 0x0;

	D12_ReadChipID();

	if(MCU_SWM0 == 0 && MCU_SWM1 == 0) {
		MCU_D12RST = 0;//DMA设置
		MCU_D12RST = 1;
		D12_SetDMA(0x0);
	}

	bEPPflags.value = 0;
	reconnect_USB();//重新连接USB
/*
	if((i = D12_GetDMA()) == 0xC3) {
		D12_SendResume();//发送恢复处理
	}
	else {
		bEPPflags.value = 0;
		reconnect_USB();//重新连接USB
	}
*/
	/* Main program loop */

	while( TRUE ){

		if (bEPPflags.bits.timer){
			DISABLE;//定时器溢出,检测按键状态
			bEPPflags.bits.timer = 0;
			ENABLE;

			if(bEPPflags.bits.configuration)//设备未配置返回
				check_key_LED();
		}

		if(RI) {
			key = _getkey();//按键输入
			switch(key) {//显示查询状态
				case 'i':
					if(bEPPflags.bits.control_state == USB_IDLE)
						printf("Control state = USB_IDLE.");
					else if(bEPPflags.bits.control_state == USB_RECEIVE)
						printf("Control state = USB_RECEIVE.");
					else if(bEPPflags.bits.control_state == USB_TRANSMIT)
						printf("Control state = USB_TRANSMIT.");
					printf(" ControlData.wCount = %x.\n", ControlData.wCount);
					printf("Endpoint 4 (Bulk Out) Status = %bx, Endpoint 5 (Bulk In) Status = %bx.\n",
					   D12_ReadEndpointStatus(4), D12_ReadEndpointStatus(5));
					if(bEPPflags.bits.dma_state == DMA_IDLE)
						printf("DMA_State = DMA_IDLE.\n");
					else if(bEPPflags.bits.dma_state == DMA_RUNNING)
						printf("DMA_State = DMA_RUNNING.\n");
					else if(bEPPflags.bits.dma_state == DMA_PENDING)
						printf("DMA_State = DMA_PENDING.\n");

					printf("Last Device Request: bmRequestType = 0x%bx, bRequest= 0x%bx, wValue = 0x%x, wLength = 0x%x, wIndex = 0x%x.\n",

						ControlData.DeviceRequest.bmRequestType,
						ControlData.DeviceRequest.bRequest,
						ControlData.DeviceRequest.wValue,
						ControlData.DeviceRequest.wLength,
						ControlData.DeviceRequest.wIndex);

					printf("Data: ");
					for(i = 0; i < ControlData.DeviceRequest.wLength; i ++)
						printf("0x%bx, ", *((ControlData.dataBuffer)+i));
					printf("\n");

					break;
				case '\r':
					reconnect_USB();
					break;

				case 'v':
					if(bEPPflags.bits.verbose == 0) {
						printf("Verbose Mode = ON.\n");
						DISABLE;
						bEPPflags.bits.verbose = 1;
						ENABLE;
					}
					else {
						printf("Verbose Mode = OFF.\n");
						DISABLE;
						bEPPflags.bits.verbose = 0;
						ENABLE;
					}
					break;
				default:
					break;
			}
		}

		if (bEPPflags.bits.bus_reset) {//设备复位处理
			DISABLE;
			bEPPflags.bits.bus_reset = 0;
			ENABLE;
			// Release D12's SUSPEND pin after bus reset
			// Enable 74HCT123 pulse generation before disconnect
			D12SUSPD = 1;
		} // if bus reset

		if (bEPPflags.bits.suspend) {//挂起改变处理
			DISABLE;
			bEPPflags.bits.suspend= 0;
			ENABLE;

			if(D12SUSPD == 1) {//挂起处理
				D12SUSPD = 0;
				P0 = 0xFF;
				P1 = 0xFF;
				P2 = 0xFF;
				P3 = 0xFF;
				D12_SetDMA(0xC3);
				D12SUSPD = 1;
				PCON |= 0x02;
				while (1);
			}
		} // if suspend change

		if (bEPPflags.bits.setup_packet){//Setup包处理
			DISABLE;
			bEPPflags.bits.setup_packet = 0;
			ENABLE;
			control_handler();//调用请求处理子程序
			D12SUSPD = 1;
		} // if setup_packet

		if(bEPPflags.bits.setup_dma != 0) {//DMA状态改变处理
			DISABLE;
			bEPPflags.bits.setup_dma --;
			ENABLE;
			setup_dma();
		} // if setup_dma

	} // Main Loop
}

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

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

//连接USB总线
void connect_USB(void)
{
	// reset event flags
	DISABLE;
	bEPPflags.value = 0;//清除所有状态
	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);
}

//重新连接到USB总线
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
	D12SUSPD = 0;
	disconnect_USB();

	printf("Wait for 1 second ...\n");

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

	connect_USB();

	MCU_LED0 = 1;
	MCU_LED1 = 1;
}

//恢复到未配置状态
void init_unconfig(void)
{
//	unsigned char i;

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

//设置配置状态
void init_config(void)
{
	D12_SetEndpointEnable(1);	/* Enable  generic/iso endpoints. */
}

//从端点号1发送数据
void single_transmit(unsigned char * buf, unsigned char len)
{
	if( len <= EP0_PACKET_SIZE) {
		D12_WriteEndpoint(1, len, buf);
	}
}

//发送端点号1建立代码
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);//发送16字节数据
		ControlData.wCount += EP0_PACKET_SIZE;
		DISABLE;
		bEPPflags.bits.control_state = USB_TRANSMIT;
		ENABLE;
	}
	else {
		D12_WriteEndpoint(1, ControlData.wLength, pRomData);//发送16字节内数据
		ControlData.wCount += ControlData.wLength;
		DISABLE;
		bEPPflags.bits.control_state = USB_IDLE;
		ENABLE;
	}
}

//LED和按键处理子程序
void check_key_LED(void)
{
	static unsigned char c, last_key = 0xf;

	c = MCU_SWM0 & MCU_SWM1;
	c &= 0x0f;
	if (c != last_key) {
		D12_WriteEndpoint(3, 1, &c);//发送按键状态
	}

	last_key = c;

	if(bEPPflags.bits.ep1_rxdone) {
		DISABLE;
		bEPPflags.bits.ep1_rxdone = 0;
		ENABLE;
		MCU_LED0 = !(GenEpBuf[3] & 0x1);//改变LED状态
		MCU_LED1 = !(GenEpBuf[3] & 0x2);
	}
}

//DMA建立子程序
void setup_dma()
{
	ioSize = ioRequest.uSize;
	ioCount = 0;

	DISABLE;
	bEPPflags.bits.dma_state = DMA_RUNNING;
	ENABLE;

	single_transmit(0, 0);

	if(ioRequest.bCommand & 0x1) {
		if(ioSize > 64 || ioSize == 0) {
			//传输大于64字节数据
			D12_WriteEndpoint(5, 64, EpBuf);
			ioCount += 64;
		}
		else {
			//传输64字节数据
			D12_WriteEndpoint(5, ioSize, EpBuf);
			ioCount += ioSize;
		}
	}
}

//请求处理子程序
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); //显示设备请求

	if (type == USB_STANDARD_REQUEST)
		(*StandardDeviceRequest[req])();//调用标准请求
	else if (type == USB_VENDOR_REQUEST)
		(*VendorDeviceRequest[req])();//调用厂商请求
	else
		stall_ep0();
}