I2C接口输入输出示例.rar_EZUSB I2C_i2c_i2c port_i2c_transfer

// CH-30 HID USB I2C OUTPUT 韌體架構程式碼(修改FW.C) 01/08/02, S.Y.H #include "ezusb.h" #include "ezregs.h" //----------------------------------------------------------------------------- // Random Macros //----------------------------------------------------------------------------- #define min(a,b) (((a)<(b))?(a):(b)) #define max(a,b) (((a)>(b))?(a):(b)) //----------------------------------------------------------------------------- // Constants //----------------------------------------------------------------------------- #define DELAY_COUNT 0x9248*8L // Delay for 8 sec at 24Mhz, 4 sec at 48 //----------------------------------------------------------------------------- // Global Variables //----------------------------------------------------------------------------- volatile BOOL GotSUD; BOOL Rwuen; BOOL Selfpwr; volatile BOOL Sleep; // Sleep mode enable flag WORD pDeviceDscr; // Pointer to Device Descriptor; Descriptors may be moved WORD pConfigDscr; WORD pStringDscr; WORD pReportDscr; BYTE reportlen; //----------------------------------------------------------------------------- // Prototypes //----------------------------------------------------------------------------- void SetupCommand(void); void TD_Init(void); void TD_Poll(void); BOOL TD_Suspend(void); BOOL TD_Resume(void); BOOL DR_GetDescriptor(void); BOOL DR_SetConfiguration(void); BOOL DR_GetConfiguration(void); BOOL DR_SetInterface(void); BOOL DR_GetInterface(void); BOOL DR_GetStatus(void); BOOL DR_ClearFeature(void); BOOL DR_SetFeature(void); BOOL DR_VendorCmnd(void); //----------------------------------------------------------------------------- // Code //----------------------------------------------------------------------------- // Task dispatcher void main(void) { DWORD i; WORD offset; DWORD DevDescrLen; DWORD j=0; WORD IntDescrAddr; WORD ExtDescrAddr; // Initialize Global States Sleep = FALSE; // Disable sleep mode Rwuen = FALSE; // Disable remote wakeup Selfpwr = FALSE; // Disable self powered GotSUD = FALSE; // Clear "Got setup data" flag // Initialize user device TD_Init(); // The following section of code is used to relocate the descriptor table. // Since the SUDPTRH and SUDPTRL are assigned the address of the descriptor // table, the descriptor table must be located in on-part memory. // The 4K demo tools locate all code sections in external memory. // The descriptor table is relocated by the frameworks ONLY if it is found // to be located in external memory. pDeviceDscr = (WORD)&DeviceDscr; pConfigDscr = (WORD)&ConfigDscr; pStringDscr = (WORD)&StringDscr; // HID code start pReportDscr = (WORD)&ReportDscr; // HID code end if ((WORD)&DeviceDscr & 0xe000) { IntDescrAddr = INTERNAL_DSCR_ADDR; ExtDescrAddr = (WORD)&DeviceDscr; DevDescrLen = (WORD)&UserDscr - (WORD)&DeviceDscr + 2; for (i = 0; i < DevDescrLen; i++) *((BYTE xdata *)IntDescrAddr+i) = 0xCD; for (i = 0; i < DevDescrLen; i++) *((BYTE xdata *)IntDescrAddr+i) = *((BYTE xdata *)ExtDescrAddr+i); pDeviceDscr = IntDescrAddr; offset = (WORD)&DeviceDscr - INTERNAL_DSCR_ADDR; pConfigDscr -= offset; pStringDscr -= offset; // HID code start pReportDscr -= offset; // HID code end } EZUSB_IRQ_ENABLE(); // Enable USB interrupt (INT2) EZUSB_ENABLE_RSMIRQ(); // Wake-up interrupt // The 8051 is responsible for all USB events, even those that have happened // before this point. We cannot ignore pending USB interrupts. // The chip will come out of reset with the flags all cleared. // USBIRQ = 0xff; // Clear any pending USB interrupt requests PORTCCFG |= 0xc0; // Turn on r/w lines for external memory USBBAV = USBBAV | 1 & ~bmBREAK; // Disable breakpoints and autovectoring USBIEN |= bmSUDAV | bmSUTOK | bmSUSP | bmURES; // Enable selected interrupts EA = 1; // Enable 8051 interrupts // This loop waits until we receive a setup packet from the host. // NOTE: The device will continue to renumerate until it receives a setup // packet. This fixes a microsoft USB bug that loses disconnect/reconnect // events during initial USB device driver configuration dialog box. // B2 Load: This code is not needed for B2 load, only for renumeration. #ifndef NO_RENUM while(!GotSUD) { if(!GotSUD) EZUSB_Discon(TRUE); // renumerate until setup received for(j=0;(j<DELAY_COUNT) && (!GotSUD);++j); } #endif CKCON = (CKCON&(~bmSTRETCH)) | FW_STRETCH_VALUE; // Set stretch to 0 (after renumeration) // Task Dispatcher while(TRUE) // Main Loop { if(GotSUD) // Wait for SUDAV { SetupCommand(); // Implement setup command GotSUD = FALSE; // Clear SUDAV flag } // Poll User Device // NOTE: Idle mode stops the processor clock. There are only two // ways out of idle mode, the WAKEUP pin, and detection of the USB // resume state on the USB bus. The timers will stop and the // processor will not wake up on any other interrupts. if (Sleep) { if(TD_Suspend()) { Sleep = FALSE; // Clear the "go to sleep" flag. Do it here to prevent any race condition between wakeup and the next sleep. do { EZUSB_Susp(); // Place processor in idle mode. } while(!Rwuen && EZUSB_EXTWAKEUP()); // Must continue to go back into suspend if the host has disabled remote wakeup // *and* the wakeup was caused by the external wakeup pin. // 8051 activity will resume here due to USB bus or Wakeup# pin activity. EZUSB_Resume(); // If source is the Wakeup# pin, signal the host to Resume. TD_Resume(); } } TD_Poll(); } } // Device request parser void SetupCommand(void) // A Setup packet has been received. { //*dscr_ptr is the address of a descriptor?? void *dscr_ptr; DWORD i; switch(SETUPDAT[1]) //SETUPDAT[1] contains the control request { case SC_GET_DESCRIPTOR: // *** Get Descriptor if(DR_GetDescriptor()) //If the request is Get_Descriptor, find out which descriptor was requested. switch(SETUPDAT[3]) //The descriptor type is in the high byte of wValue, stored in SETUPDAT[3]. { case GD_DEVICE: // Device //If the request is for a device descriptor, store the pointers //in SUDPTRH and SUDPTRL and the hardware does the rest. SUDPTRH = MSB(pDeviceDscr); SUDPTRL = LSB(pDeviceDscr); break; case GD_CONFIGURATION: // Configuration /*If the request is for a configuration descriptor, find out if the configuration is valid. The config. index is in the low byte of wValue, stored in SETUPDAT[2]. */ if(dscr_ptr = (void *)EZUSB_GetConfigDscr(SETUPDAT[2])) { SUDPTRH = MSB(dscr_ptr); SUDPTRL = LSB(dscr_ptr); } else EZUSB_STALL_EP0(); // Stall End Point 0 break; case GD_STRING: // String if(dscr_ptr = (void *)EZUSB_GetStringDscr(SETUPDAT[2])) { // Workaround for rev D errata number 8 // If you're certain that you will never run on rev D, // you can just do this: // SUDPTRH = MSB(dscr_ptr); // SUDPTRL = LSB(dscr_ptr); STRINGDSCR *sdp; BYTE len; sdp = dscr_ptr; len = sdp->length; if (len > SETUPDAT[6]) len = SETUPDAT[6]; //limit to the requested length while (len) { for(i=0; i<min(len,64); i++) *(IN0BUF+i) = *((BYTE xdata *)sdp+i); //set length and arm Endpoint EZUSB_SET_EP_BYTES(IN0BUF_ID,min(len,64)); len -= min(len,64); // Wait for it to go out (Rev C and above)