//-----------------------------------------------------------------------------//   File:      bulkloop.c//   Contents:  Hooks required to implement USB peripheral function.//// $Archive: /USB/Examples/FX2LP/bulkloop/bulkloop.c $//////-----------------------------------------------------------------------------// Copyright (c) 2011, Cypress Semiconductor Corporation All rights reserved//-----------------------------------------------------------------------------#pragma NOIV               // Do not generate interrupt vectors //F:告诉编译器,不要使用默认的中断向量表#include "..\inc\fx2.h"#include "..\inc\fx2regs.h"#include "..\inc\syncdly.h"            // SYNCDELAY macroextern BOOL GotSUD;             // Received setup data flagextern BOOL Sleep;extern BOOL Rwuen;extern BOOL Selfpwr;BYTE Configuration;             // Current configurationBYTE AlternateSetting;          // Alternate settings#define VR_NAKALL_ON    0xD0    //F: 1101 0000#define VR_NAKALL_OFF   0xD1    //F: 1101 0001//-----------------------------------------------------------------------------// Task Dispatcher hooks        //F:任务分配挂钩//   The following hooks are called by the task dispatcher. //F:挂钩函数是被任务分配器调用的//-----------------------------------------------------------------------------void TD_Init(void)             // Called once at startup{   // set the CPU clock to 48MHz   CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1) ;    //F:CLKSPD1=1且CLKSPD0=0 意思是48MHz   // set the slave FIFO interface to 48MHz       //F:时钟来源定为外部,内部FIFO\GPIF时钟设为48MHz,IFCLK输出端口为三态,IFCLK极性不翻转,同步方式,PE012为端口,ABD端口为端口模式   IFCONFIG |= 0x40;  //F: 下面的寄存器的修改之间需要添加同步延时  // Registers which require a synchronization delay, see section 15.14  // FIFORESET        FIFOPINPOLAR  // INPKTEND         OUTPKTEND  // EPxBCH:L         REVCTL  // GPIFTCB3         GPIFTCB2  // GPIFTCB1         GPIFTCB0  // EPxFIFOPFH:L     EPxAUTOINLENH:L  // EPxFIFOCFG       EPxGPIFFLGSEL  // PINFLAGSxx       EPxFIFOIRQ  // EPxFIFOIE        GPIFIRQ  // GPIFIE           GPIFADRH:L  // UDMACRCH:L       EPxGPIFTRIG  // GPIFTRIG    // Note: The pre-REVE EPxGPIFTCH/L register are affected, as well...  //      ...these have been replaced by GPIFTC[B3:B0] registers  // default: all endpoints have their VALID bit set  // default: TYPE1 = 1 and TYPE0 = 0 --> BULK    // default: EP2 and EP4 DIR bits are 0 (OUT direction)  // default: EP6 and EP8 DIR bits are 1 (IN direction)  // default: EP2, EP4, EP6, and EP8 are double buffered  // we are just using the default values, yes this is not necessary...  EP1OUTCFG = 0xA0;  EP1INCFG = 0xA0;  SYNCDELAY;                    // see TRM section 15.14  EP2CFG = 0xA2; //F:1010 0010意思是:有效,OUT,Bulk,512,0,Double.  SYNCDELAY;                      EP4CFG = 0xA0; //F:1010 0000意思是:有效,OUT,Bulk,512,0,00(4和8端点的末尾两位只能是0,在2和6都是Double情况下,意味着Double).  SYNCDELAY;                      EP6CFG = 0xE2; //F:1110 0010意思是:有效,IN,Bulk,512,0,Double.  SYNCDELAY;                      EP8CFG = 0xE0; //F:1110 0000意思是:有效,OUT,Bulk,512,0,00.  // out endpoints do not come up armed //F:输出端点一开始没有被arm.    // since the defaults are double buffered we must write dummy byte counts twice  //F:因为端点默认是双倍缓冲(512*2),我们必须用无用数据写两次字节计数,用来arm输出端点.  SYNCDELAY;                      EP2BCL = 0x80;                // arm EP2OUT by writing byte count w/skip.  SYNCDELAY;                      EP2BCL = 0x80;  SYNCDELAY;                      EP4BCL = 0x80;                // arm EP4OUT by writing byte count w/skip.  SYNCDELAY;                      EP4BCL = 0x80;      // enable dual autopointer feature //F:使能自动指针  AUTOPTRSETUP |= 0x01;}void TD_Poll(void)              // Called repeatedly while the device is idle //F:重复调用{  WORD i;  WORD count;  if(!(EP2468STAT & bmEP2EMPTY))    //F:如果EP2的buff不空.EP2468STAT中的各个位其实就是EPxCS中的F和E位,标识满\空.  { // check EP2 EMPTY(busy) bit in EP2468STAT (SFR), core set‘s this bit when FIFO is empty     if(!(EP2468STAT & bmEP6FULL))    //F:如果EP6的buff不满.     {  // check EP6 FULL(busy) bit in EP2468STAT (SFR), core set‘s this bit when FIFO is full        APTR1H = MSB( &EP2FIFOBUF );    //F:自动指针1指向EP2的buffer        APTR1L = LSB( &EP2FIFOBUF );        AUTOPTRH2 = MSB( &EP6FIFOBUF );    //F:自动指针2指向EP6的buffer        AUTOPTRL2 = LSB( &EP6FIFOBUF );        count = (EP2BCH << 8) + EP2BCL;    //F:计算EP2有多少字节        // loop EP2OUT buffer data to EP6IN        for( i = 0x0000; i < count; i++ )        {           // setup to transfer EP2OUT buffer to EP6IN buffer using AUTOPOINTER(s)           // F:利用自动指针进行EP2和EP6之间的数据转移           EXTAUTODAT2 = EXTAUTODAT1; // F:自动指针1指向的数据到自动指针2指向的空间        }        EP6BCH = EP2BCH;      //F:宝贝数据长度到EP6的计数,准备接下来的IN操作        SYNCDELAY;          EP6BCL = EP2BCL;        // arm EP6IN        SYNCDELAY;                            EP2BCL = 0x80;          // re(arm) EP2OUT     }  }  if(!(EP2468STAT & bmEP4EMPTY))  { // check EP4 EMPTY(busy) bit in EP2468STAT (SFR), core set‘s this bit when FIFO is empty     if(!(EP2468STAT & bmEP8FULL))     {  // check EP8 FULL(busy) bit in EP2468STAT (SFR), core set‘s this bit when FIFO is full        APTR1H = MSB( &EP4FIFOBUF );        APTR1L = LSB( &EP4FIFOBUF );        AUTOPTRH2 = MSB( &EP8FIFOBUF );        AUTOPTRL2 = LSB( &EP8FIFOBUF );        count = (EP4BCH << 8) + EP4BCL;        // loop EP4OUT buffer data to EP8IN        for( i = 0x0000; i < count; i++ )        {           // setup to transfer EP4OUT buffer to EP8IN buffer using AUTOPOINTER(s)           EXTAUTODAT2 = EXTAUTODAT1;        }        EP8BCH = EP4BCH;          SYNCDELAY;          EP8BCL = EP4BCL;        // arm EP8IN        SYNCDELAY;                            EP4BCL = 0x80;          // re(arm) EP4OUT     }  }}BOOL TD_Suspend(void)          // Called before the device goes into suspend mode 可自定义{   return(TRUE);}BOOL TD_Resume(void)          // Called after the device resumes 可自定义{   return(TRUE);}//-----------------------------------------------------------------------------// Device Request hooks 设备请求执行函数,大多数可自定义//   The following hooks are called by the end point 0 device request parser.//-----------------------------------------------------------------------------BOOL DR_GetDescriptor(void){   return(TRUE);}BOOL DR_SetConfiguration(void)   // Called when a Set Configuration command is received{   Configuration = SETUPDAT[2];    //F:Configuration这个变量是哪里定义的?还是编译器内部定义的?如何与描述符表联系在一起???   return(TRUE);            // Handled by user code}BOOL DR_GetConfiguration(void)   // Called when a Get Configuration command is received{   EP0BUF[0] = Configuration;   EP0BCH = 0;   EP0BCL = 1;                //F: arm EP0   return(TRUE);            // Handled by user code}BOOL DR_SetInterface(void)       // Called when a Set Interface command is received{   AlternateSetting = SETUPDAT[2];   return(TRUE);            // Handled by user code}BOOL DR_GetInterface(void)       // Called when a Set Interface command is received{   EP0BUF[0] = AlternateSetting;   EP0BCH = 0;   EP0BCL = 1;   return(TRUE);            // Handled by user code}BOOL DR_GetStatus(void){   return(TRUE);}BOOL DR_ClearFeature(void){   return(TRUE);}BOOL DR_SetFeature(void){   return(TRUE);}BOOL DR_VendorCmnd(void)    //F:生产商请求{  BYTE tmp;    switch (SETUPDAT[1])  {     case VR_NAKALL_ON:        //F:NAK所有transfer请求        tmp =FIFORESET;        //F:为什么不直接 FIFORESET|=bmNAKALL ???        tmp |= bmNAKALL;              SYNCDELAY;                            FIFORESET = tmp;    //F:这样费周折是因为FIFORESET不可以按位访问吗???        break;     case VR_NAKALL_OFF:            tmp = FIFORESET;        tmp &= ~bmNAKALL;              SYNCDELAY;                            FIFORESET = tmp;        break;     default:        return(TRUE);  }  return(FALSE);}//-----------------------------------------------------------------------------// USB Interrupt Handlers//   The following functions are called by the USB interrupt jump table.//-----------------------------------------------------------------------------// Setup Data Available Interrupt Handlervoid ISR_Sudav(void) interrupt 0    //F:有控制传输的8字节数据到达{   GotSUD = TRUE;            // Set flag   EZUSB_IRQ_CLEAR();        //F:重置中断请求,write 0 to EXIF.5   USBIRQ = bmSUDAV;         // Clear SUDAV IRQ //F:向指定的位写1以清楚终端请求}// Setup Token Interrupt Handlervoid ISR_Sutok(void) interrupt 0    //F:USB内核接收到Setup传输的Token {   EZUSB_IRQ_CLEAR();   USBIRQ = bmSUTOK;         // Clear SUTOK IRQ}void ISR_Sof(void) interrupt 0        //F:USB内核收到 Start of Frame packet{   EZUSB_IRQ_CLEAR();   USBIRQ = bmSOF;            // Clear SOF IRQ}void ISR_Ures(void) interrupt 0    //F:USB Reset Interrupt Request{   // whenever we get a USB reset, we should revert to full speed mode   //任何时刻接收到USB reset,都应该滚回全速模式   pConfigDscr = pFullSpeedConfigDscr;   ((CONFIGDSCR xdata *) pConfigDscr)->type = CONFIG_DSCR;   pOtherConfigDscr = pHighSpeedConfigDscr;   ((CONFIGDSCR xdata *) pOtherConfigDscr)->type = OTHERSPEED_DSCR;   EZUSB_IRQ_CLEAR();   USBIRQ = bmURES;         // Clear URES IRQ}void ISR_Susp(void) interrupt 0{   Sleep = TRUE;   EZUSB_IRQ_CLEAR();   USBIRQ = bmSUSP;}void ISR_Highspeed(void) interrupt 0{   if (EZUSB_HIGHSPEED())   {      pConfigDscr = pHighSpeedConfigDscr;      ((CONFIGDSCR xdata *) pConfigDscr)->type = CONFIG_DSCR;      pOtherConfigDscr = pFullSpeedConfigDscr;      ((CONFIGDSCR xdata *) pOtherConfigDscr)->type = OTHERSPEED_DSCR;   }   EZUSB_IRQ_CLEAR();   USBIRQ = bmHSGRANT;}void ISR_Ep0ack(void) interrupt 0{}void ISR_Stub(void) interrupt 0{}void ISR_Ep0in(void) interrupt 0{}void ISR_Ep0out(void) interrupt 0{}void ISR_Ep1in(void) interrupt 0{}void ISR_Ep1out(void) interrupt 0{}void ISR_Ep2inout(void) interrupt 0{}void ISR_Ep4inout(void) interrupt 0{}void ISR_Ep6inout(void) interrupt 0{}void ISR_Ep8inout(void) interrupt 0{}void ISR_Ibn(void) interrupt 0{}void ISR_Ep0pingnak(void) interrupt 0{}void ISR_Ep1pingnak(void) interrupt 0{}void ISR_Ep2pingnak(void) interrupt 0{}void ISR_Ep4pingnak(void) interrupt 0{}void ISR_Ep6pingnak(void) interrupt 0{}void ISR_Ep8pingnak(void) interrupt 0{}void ISR_Errorlimit(void) interrupt 0{}void ISR_Ep2piderror(void) interrupt 0{}void ISR_Ep4piderror(void) interrupt 0{}void ISR_Ep6piderror(void) interrupt 0{}void ISR_Ep8piderror(void) interrupt 0{}void ISR_Ep2pflag(void) interrupt 0{}void ISR_Ep4pflag(void) interrupt 0{}void ISR_Ep6pflag(void) interrupt 0{}void ISR_Ep8pflag(void) interrupt 0{}void ISR_Ep2eflag(void) interrupt 0{}void ISR_Ep4eflag(void) interrupt 0{}void ISR_Ep6eflag(void) interrupt 0{}void ISR_Ep8eflag(void) interrupt 0{}void ISR_Ep2fflag(void) interrupt 0{}void ISR_Ep4fflag(void) interrupt 0{}void ISR_Ep6fflag(void) interrupt 0{}void ISR_Ep8fflag(void) interrupt 0{}void ISR_GpifComplete(void) interrupt 0{}void ISR_GpifWaveform(void) interrupt 0{}