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   源码介绍

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上位机通过c8051f320 的usb控制LED

//	File best viewed using Tab Size of 4 Characters
//	Author DM 	DATE	4-4-03
//	Modified CS DATE	8-25-03
//	This example illustrates usage of the USB_API.lib
//	DO NOT locate code segments at 0x1400 to 0x4000
//	These are used for non-voltile storage for transmitted data.

//	Include files
#include <c8051f320.h>		//	Header file for SiLabs c8051f320  
#include <stddef.h>			//	Used for NULL pointer definition
#include "USB_API.h"		//	Header file for USB_API.lib
#define uchar unsigned char
#define uint unsigned int
sbit clk_164=P1^7;
sbit clr_164=P2^0;
sbit ab_164=P1^6;
//uchar led_value=0;
//uchar code tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0xe7f,0xff,0x00};
BYTE Out_Packet[8];   // Last packet received from host
BYTE In_Packet[8] ;   // Next packet to sent to host

void Port_IO_Init()
{
    P1MDOUT   = 0xF8;	   //1111 1000 高5位为推挽方式
    P2MDOUT   = 0x01;	  //P2.0为推挽方式
     XBR1      = 0xC0;	 //交叉开关使能、、弱上拉禁止
}
void Oscillator_Init()
{
    int i = 0;
	if( ( CLKMUL & ( 1<<5 ) ) ) return;
	CLKMUL = 0;
    CLKMUL    = 0x80;	   	//时钟乘法器使能
    for (i = 0; i < 20; i  );    // Wait 5us for initialization
    CLKMUL    |= 0xC0;			//初始化时钟乘法器
    while ((CLKMUL & 0x20) == 0);	//等待时钟乘法器准备好
    CLKSEL    = 0x02;	   //usbclk=48M  sysclk=24M
}
void hc_164_out(uchar value)  //74hc164输出一个字节函数
{
   uchar i;
   for(i=0;i<8;i  )
   {
   		clk_164=0;
		ab_164=(value&0x80);
		clk_164=1;
		value<<=1;
   }
   clk_164=0;								 	
}
void HC138_Sel( uchar x )	  //38译码器选中0-7
{
 	x &= 0x07;
	P1 |= ( 1<<3 ) | ( 1<<4 ) | ( 1<<5 );
	P1 &= ( ( x<<3 ) | 0xC7 );
} 
/*** [BEGIN] USB Descriptor Information [BEGIN] ***/
code const UINT USB_VID = 0x10C4;  //16位卖主ID号
code const UINT USB_PID = 0xEA61;  //16位产品ID
code const BYTE USB_MfrStr[] = {0x1A,0x03,'S',0,'i',0,'l',0,'i',0,'c',0,'o',0,'n',0,' ',0,'L',0,'a',0,'b',0,'s',0};	//描述厂商字符串                     //	Manufacturer String
code const BYTE USB_ProductStr[] = {0x10,0x03,'U',0,'S',0,'B',0,' ',0,'A',0,'P',0,'I',0};	//	描述产品字符串
code const BYTE USB_SerialStr[] = {0x0A,0x03,'1',0,'2',0,'3',0,'4',0};	   //描述序列号字符串
code const BYTE USB_MaxPower = 15;            // Max current = 30 mA (15 * 2) 最大电流
code const BYTE USB_PwAttributes = 0x80;      // Bus-powered, remote wakeup not supported 总线供电
code const UINT USB_bcdDevice = 0x0100;       // Device release number 1.00	   用BCD码表示设备版本号
/*** [ END ] USB Descriptor Information [ END ] ***/



//-----------------------------------------------------------------------------
// Main Routine
//-----------------------------------------------------------------------------
void main(void) 
{
	PCA0MD &= ~0x40;			  	//	Disable Watchdog timer	关闭看门狗
	Port_IO_Init();	
	Oscillator_Init();			   //USB时钟为48M，系统时钟为4倍时钟乘法器除2 ，即24M	
    USB_Clock_Start();                     // Init USB clock *before* calling USB_Init
    USB_Init(USB_VID,USB_PID,USB_MfrStr,USB_ProductStr,USB_SerialStr,USB_MaxPower,USB_PwAttributes,USB_bcdDevice);
	
//	CLKSEL |= 0x02;	//USB时钟为48M，系统时钟为4倍时钟乘法器除2 ，即24M	
//	RSTSRC	|=	0x02;//复位源寄存器	写：使能VDD监视器为复位源	 读：最后一次复位是上电或VDD监视器复位
//	Port_Init();						//	Initialize crossbar and GPIO
	USB_Int_Enable();					//	Enable USB_API Interrupts
	HC138_Sel(0);					  //选通Y0
	USB_Int_Enable();
	EA=1;						 //开总中断
	while (1)
	{
	  if (Out_Packet[0] == 0xAA) 
	  	hc_164_out(0x00);   		// 	  灯亮
     
      if (Out_Packet[0] == 0x55)  
	  	hc_164_out(0xff);			// 	灯灭
    
	}
}



	//	ISR for USB_API, run when API interrupts are enabled, and an interrupt is received	*/
void 	USB_API_TEST_ISR(void)	interrupt	16
{
	BYTE	INTVAL	=	Get_Interrupt_Source();	//	Determine type of API interrupts
	if (INTVAL & TX_COMPLETE)
	{
		Block_Write(In_Packet, 8);
	}
	if (INTVAL & RX_COMPLETE)
	{
		Block_Read(Out_Packet, 8);
	}
}