/******************************************************************** FileName: main.c Dependencies: See INCLUDES section Processor: PIC32MX USB Microcontrollers Hardware: The code is natively intended to be used on the following hardware platforms: Explorer 16 + PIC32MX460F512L PIM. The firmware may be modified for use on other USB platforms by editing the HardwareProfile.h file. Complier: Microchip C32 (for PIC32) Company: Microchip Technology, Inc. Software License Agreement: The software supplied herewith by Microchip Technology Incorporated (the “Company”) for its PIC® Microcontroller is intended and supplied to you, the Company’s customer, for use solely and exclusively on Microchip PIC Microcontroller products. The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved. Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil liability for the breach of the terms and conditions of this license. THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. ******************************************************************** File Description: Change History: Rev Description ----- --------------------------------------------- v2.2 Adapted from PIC18F87J50 HID Bootloader Firmware as basis for BootApplication(). The rest of the code was taken from the Simple HID Demo in MCHPFSUSB v2.2. vx.x Fixed race condition where an OUT packet could potentially clear the prior IN packet depending on the bus communication order. Rev Date Description 1.0 04/30/2008 Initial Release Adapted from PIC18F87J50 HID Bootloader Firmware as basis for BootApplication(). The rest of the code was taken from the Simple HID Demo in MCHPFSUSB v2.1. 1.1 Modified for UBW32 project with software_key and different button/LED I/O bits 1.2 Fixed bug in boot_software_key_sec so it works properly all the time. 1.3 Updated code to use latest stack USB v2.5a 1.4 Updated main code to match HID Bootloader from 2.6A USB stack 08/28/2010 Updated to use Microchip folder - from Microchip Applications Library USB stack v2.7 - updated project to use unchanged MAL Microchip folder - no code changes ********************************************************************/ #ifndef USBMOUSE_C #define USBMOUSE_C /** INCLUDES *******************************************************/ #include "./USB/usb.h" #include "HardwareProfile.h" #include "./USB/usb_function_hid.h" // Comment out this define if you want bootloader to wait forever #define BOOTLOADER_TIMEOUT /** CONFIGURATION **************************************************/ #if !defined(__PIC32MX__) #error "This project was designed for PIC32MX family devices. Please select the appropriate project for your target device family." #endif #pragma config FPLLODIV = DIV_1 // PLL Output Divider #pragma config UPLLEN = ON // USB PLL Enabled #pragma config UPLLIDIV = DIV_2 // USB PLL Input Divider #pragma config FPLLMUL = MUL_20 // PLL Multiplier #pragma config FPLLIDIV = DIV_2 // PLL Input Divider #pragma config FWDTEN = OFF // Watchdog Timer #pragma config FPBDIV = DIV_1 // Peripheral Clock divisor #pragma config WDTPS = PS1 // Watchdog Timer Postscale #pragma config FCKSM = CSECME // Clock Switching & Fail Safe Clock Monitor enabled #pragma config OSCIOFNC = OFF // CLKO Enable #pragma config POSCMOD = HS // Primary Oscillator #pragma config IESO = ON // Internal/External Switch-over #pragma config FSOSCEN = OFF // Secondary Oscillator Enable (KLO was off) #pragma config FNOSC = PRIPLL // Oscillator Selection #pragma config CP = OFF // Code Protect #pragma config BWP = OFF // Boot Flash Write Protect #pragma config PWP = OFF // Program Flash Write Protect #pragma config ICESEL = ICS_PGx2 // ICE/ICD Comm Channel Select #pragma config DEBUG = OFF // Background Debugger Enable /** C O N S T A N T S **********************************************************/ /**** configurations settings *************************************************/ #define FLASH_PAGE_SIZE 4096 #define ProgramMemStart 0x1D005000 //Beginning of application program memory (not occupied by bootloader). **THIS VALUE MUST BE ALIGNED WITH BLOCK BOUNDRY** Also, in order to work correctly, make sure the StartPageToErase is set to erase this section. #define BootMemStart 0x9D006000 //Beginning of application program memory (not occupied by bootloader). **THIS VALUE MUST BE ALIGNED WITH BLOCK BOUNDRY** Also, in order to work correctly, make sure the StartPageToErase is set to erase this section. #define MaxPageToEraseNoConfigs BMXPFMSZ/FLASH_PAGE_SIZE //Last full page of flash on the PIC24FJ256GB110, which does not contain the flash configuration words. #define MaxPageToEraseWithConfigs BMXPFMSZ/FLASH_PAGE_SIZE //Page 170 contains the flash configurations words on the PIC24FJ256GB110. Page 170 is also smaller than the rest of the (1536 byte) pages. #define ProgramMemStopNoConfigs 0x1D000000 + BMXPFMSZ #define ProgramMemStopWithConfigs 0x1D000000 + BMXPFMSZ /**** definitions *************************************************************/ //Switch State Variable Choices #define QUERY_DEVICE 0x02 //Command that the host uses to learn about the device (what regions can be programmed, and what type of memory is the region) #define UNLOCK_CONFIG 0x03 //Note, this command is used for both locking and unlocking the config bits (see the "//Unlock Configs Command Definitions" below) #define ERASE_DEVICE 0x04 //Host sends this command to start an erase operation. Firmware controls which pages should be erased. #define PROGRAM_DEVICE 0x05 //If host is going to send a full RequestDataBlockSize to be programmed, it uses this command. #define PROGRAM_COMPLETE 0x06 //If host send less than a RequestDataBlockSize to be programmed, or if it wished to program whatever was left in the buffer, it uses this command. #define GET_DATA 0x07 //The host sends this command in order to read out memory from the device. Used during verify (and read/export hex operations) #define RESET_DEVICE 0x08 //Resets the microcontroller, so it can update the config bits (if they were programmed, and so as to leave the bootloader (and potentially go back into the main application) //Unlock Configs Command Definitions #define UNLOCKCONFIG 0x00 //Sub-command for the ERASE_DEVICE command #define LOCKCONFIG 0x01 //Sub-command for the ERASE_DEVICE command //Query Device Response "Types" #define TypeProgramMemory 0x01 //When the host sends a QUERY_DEVICE command, need to respond by populating a list of valid memory regions that exist in the device (and should be programmed) #define TypeEEPROM 0x02 #define TypeConfigWords 0x03 #define TypeEndOfTypeList 0xFF //Sort of serves as a "null terminator" like number, which denotes the end of the memory region list has been reached. //BootState Variable States #define IdleState 0x00 #define NotIdleState 0x01 //OtherConstants #define InvalidAddress 0xFFFFFFFF //Application and Microcontroller constants #define DEVICE_FAMILY 0x03 //0x01 for PIC18, 0x02 for PIC24, 0x03 for PIC23 #define TotalPacketSize 0x40 #define WORDSIZE 0x04 //PIC18 uses 2 byte instruction words, PIC24 uses 3 byte "instruction words" (which take 2 addresses, since each address is for a 16 bit word; the upper word contains a "phantom" byte which is unimplemented.). #define RequestDataBlockSize 56 //Number of bytes in the "Data" field of a standard request to/from the PC. Must be an even number from 2 to 56. #define BufferSize 0x20 //32 16-bit words of buffer // Let compile time pre-processor calculate the CORE_TICK_PERIOD #define SYS_FREQ (80000000L) #define TOGGLES_PER_SEC 1000 #define CORE_TICK_RATE (SYS_FREQ/2/TOGGLES_PER_SEC) // How many ms to wait before running applicaation #define BOOTLOADER_TIMEOUT_MS (5000); /** PRIVATE PROTOTYPES *********************************************/ void BlinkUSBStatus(void); BOOL Switch2IsPressed(void); BOOL Switch3IsPressed(void); void Emulate_Mouse(void); static void InitializeSystem(void); void ProcessIO(void); void UserInit(void); void YourHighPriorityISRCode(); void YourLowPriorityISRCode(); void BlinkUSBStatus(void); void UserInit(void); void EraseFlash(void); void WriteFlashSubBlock(void); void BootApplication(void); DWORD ReadProgramMemory(DWORD); /** T Y P E D E F I N I T I O N S ************************************/ typedef union __attribute__ ((packed)) _USB_HID_BOOTLOADER_COMMAND { unsigned char Contents[64]; struct __attribute__ ((packed)) { unsigned char Command; WORD AddressHigh; WORD AddressLow; unsigned char Size; unsigned char PadBytes[(TotalPacketSize - 6) - (RequestDataBlockSize)]; unsigned int Data[RequestDataBlockSize/WORDSIZE]; }; struct __attribute__ ((packed)) { unsigned char Command; DWORD Address; unsigned char Size; unsigned char PadBytes[(TotalPacketSize - 6) - (RequestDataBlockSize)]; unsigned int Data[RequestDataBlockSize/WORDSIZE]; }; struct __attribute__ ((packed)){ unsigned char Command; unsigned char PacketDataFieldSize; unsigned char DeviceFamily; unsigned char Type1; unsigned long Address1; unsigned long Length1; unsigned char Type2; unsigned long Address2; unsigned long Length2; unsigned char Type3; //End of sections list indicator goes here, when not programming the vectors, in that case fill with 0xFF. unsigned long Address3; unsigned long Length3; unsigned char Type4; //End of sections list indicator goes here, fill with 0xFF. unsigned char ExtraPadBytes[33]; }; struct __attribute__ ((packed)){ //For lock/unlock config command unsigned char Command; unsigned char LockValue; }; } PacketToFromPC; /** VARIABLES ******************************************************/ #pragma udata #pragma udata USB_VARS PacketToFromPC PacketFromPC; //64 byte buffer for receiving packets on EP1 OUT from the PC PacketToFromPC PacketToPC; //64 byte buffer for sending packets on EP1 IN to the PC PacketToFromPC PacketFromPCBuffer; #pragma udata USB_HANDLE USBOutHandle = 0; USB_HANDLE USBInHandle = 0; BOOL blinkStatusValid = TRUE; unsigned int __attribute__((section(".boot_software_key_sec,\"aw\",@nobits#"))) SoftwareKey; unsigned char MaxPageToErase; unsigned long ProgramMemStopAddress; unsigned char BootState; unsigned char ErasePageTracker; unsigned int ProgrammingBuffer[BufferSize]; unsigned char BufferedDataIndex; unsigned long ProgrammedPointer; unsigned char ConfigsProtected; // This gets set to TRUE when we start communicating with the PC, at which time we ignore the timeout // value. BOOL StartedProgramming; /** DECLARATIONS ***************************************************/ #pragma code BOOL IsThereAnApplication(void) { // If the first word of memory is programmed, then we have an app return (*(int *)BootMemStart != 0xFFFFFFFF); } void RunApplication(void) { void (*fptr)(void); UINT32 j; U1CON = 0x0000; //Disable USB module //And wait awhile for the USB cable capacitance to discharge down to disconnected (SE0) state. //Otherwise host might not realize we disconnected/reconnected when we do the reset. //A basic for() loop decrementing a 16 bit number would be simpler, but seems to take more code space for //a given delay. So do this instead: for(j = 0; j < 0xFFFF; j++) { Nop(); } fptr = (void (*)(void))BootMemStart; fptr(); while(1); } // This is not based on a real timer, just the number of times it was // called. Return true if we have timed out BOOL Timedout(void) { static UINT32 CallCount = 1000000; if (StartedProgramming) { return (FALSE); } if (CallCount) { CallCount--; return (FALSE); } else { return(TRUE); } } /******************************************************************** * Function: void main(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: Main program entry point. * * Note: None *******************************************************************/ #if defined(__18CXX) void main(void) #else int main(void) #endif { // mInitSwitch2(); // The PRG switch is tied high, so when it is not pressed it will read // 1. To call the normal application (i.e. don't go into the bootloader) // we need to make sure that the PRG button is not pressed, and that we // don't have a software reset // if ( // ( // (sw2 == 1) // && // ( // !( // mGetSWRFlag() // Also check for software reset (SWR) // && // SoftwareKey == 0x12345678 // ) // ) // ) // ) // { // // Must clear out software key // SoftwareKey = 0; // // if (IsThereAnApplication()) // { // RunApplication(); // } // } // Run the bootloader InitializeSystem(); mClearSWRFlag(); // Must clear out software key SoftwareKey = 0; #if defined(USB_INTERRUPT) USBDeviceAttach(); #endif while(!Timedout() || !IsThereAnApplication()) { #if defined(USB_POLLING) // Check bus status and service USB interrupts. USBDeviceTasks(); // Interrupt or polling method. If using polling, must call // this function periodically. This function will take care // of processing and responding to SETUP transactions // (such as during the enumeration process when you first // plug in). USB hosts require that USB devices should accept // and process SETUP packets in a timely fashion. Therefore, // when using polling, this function should be called // frequently (such as once about every 100 microseconds) at any // time that a SETUP packet might reasonably be expected to // be sent by the host to your device. In most cases, the // USBDeviceTasks() function does not take very long to // execute (~50 instruction cycles) before it returns. #endif // Application-specific tasks. // Application related code may be added here, or in the ProcessIO() function. ProcessIO(); }//end while // Timeout happened, so start app RunApplication(); }//end main /******************************************************************** * Function: static void InitializeSystem(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: InitializeSystem is a centralize initialization * routine. All required USB initialization routines * are called from here. * * User application initialization routine should * also be called from here. * * Note: None *******************************************************************/ static void InitializeSystem(void) { // The USB specifications require that USB peripheral devices must never source // current onto the Vbus pin. Additionally, USB peripherals should not source // current on D+ or D- when the host/hub is not actively powering the Vbus line. // When designing a self powered (as opposed to bus powered) USB peripheral // device, the firmware should make sure not to turn on the USB module and D+ // or D- pull up resistor unless Vbus is actively powered. Therefore, the // firmware needs some means to detect when Vbus is being powered by the host. // A 5V tolerant I/O pin can be connected to Vbus (through a resistor), and // can be used to detect when Vbus is high (host actively powering), or low // (host is shut down or otherwise not supplying power). The USB firmware // can then periodically poll this I/O pin to know when it is okay to turn on // the USB module/D+/D- pull up resistor. When designing a purely bus powered // peripheral device, it is not possible to source current on D+ or D- when the // host is not actively providing power on Vbus. Therefore, implementing this // bus sense feature is optional. This firmware can be made to use this bus // sense feature by making sure "USE_USB_BUS_SENSE_IO" has been defined in the // HardwareProfile.h file. #if defined(USE_USB_BUS_SENSE_IO) tris_usb_bus_sense = INPUT_PIN; // See HardwareProfile.h #endif // If the host PC sends a GetStatus (device) request, the firmware must respond // and let the host know if the USB peripheral device is currently bus powered // or self powered. See chapter 9 in the official USB specifications for details // regarding this request. If the peripheral device is capable of being both // self and bus powered, it should not return a hard coded value for this request. // Instead, firmware should check if it is currently self or bus powered, and // respond accordingly. If the hardware has been configured like demonstrated // on the PICDEM FS USB Demo Board, an I/O pin can be polled to determine the // currently selected power source. On the PICDEM FS USB Demo Board, "RA2" // is used for this purpose. If using this feature, make sure "USE_SELF_POWER_SENSE_IO" // has been defined in HardwareProfile.h, and that an appropriate I/O pin has been mapped // to it in HardwareProfile.h. #if defined(USE_SELF_POWER_SENSE_IO) tris_self_power = INPUT_PIN; // See HardwareProfile.h #endif USBDeviceInit(); //usb_device.c. Initializes USB module SFRs and firmware //variables to known states. UserInit(); StartedProgramming = FALSE; }//end InitializeSystem void UserInit(void) { //Initialize all of the LED pins mInitAllLEDs(); //Initialize all of the push buttons mInitAllSwitches(); //initialize the variable holding the handle for the last // transmission USBOutHandle = 0; USBInHandle = 0; blinkStatusValid = TRUE; //Initialize bootloader state variables MaxPageToErase = MaxPageToEraseNoConfigs; //Assume we will not allow erase/programming of config words (unless host sends override command) ProgramMemStopAddress = ProgramMemStopNoConfigs; ConfigsProtected = LOCKCONFIG; //Assume we will not erase or program the vector table at first. Must receive unlock config bits/vectors command first. BootState = IdleState; ProgrammedPointer = InvalidAddress; BufferedDataIndex = 0; }//end UserInit /******************************************************************** * Function: void ProcessIO(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: This function is a place holder for other user * routines. It is a mixture of both USB and * non-USB tasks. * * Note: None *******************************************************************/ void ProcessIO(void) { //Blink the LEDs according to the USB device status if(blinkStatusValid) { BlinkUSBStatus(); } // User Application USB tasks if((USBDeviceState < CONFIGURED_STATE)||(USBSuspendControl==1)) return; // StartedProgramming = TRUE; BootApplication(); }//end ProcessIO /******************************************************************** * Function: void BlinkUSBStatus(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: BlinkUSBStatus turns on and off LEDs * corresponding to the USB device state. * * Note: mLED macros can be found in HardwareProfile.h * USBDeviceState is declared and updated in * usb_device.c. *******************************************************************/ void BlinkUSBStatus(void) { static WORD led_count=0; if(led_count == 0)led_count = 10000U; led_count--; #define mLED_Both_Off() {mLED_1_Off();mLED_2_Off();} #define mLED_Both_On() {mLED_1_On();mLED_2_On();} #define mLED_Only_1_On() {mLED_1_On();mLED_2_Off();} #define mLED_Only_2_On() {mLED_1_Off();mLED_2_On();} if(USBSuspendControl == 1) { if(led_count==0) { mLED_1_Toggle(); mLED_2 = mLED_1; // Both blink at the same time }//end if } else { if(USBDeviceState == DETACHED_STATE) { mLED_Both_Off(); } else if(USBDeviceState == ATTACHED_STATE) { mLED_Both_On(); } else if(USBDeviceState == POWERED_STATE) { mLED_Only_1_On(); } else if(USBDeviceState == DEFAULT_STATE) { mLED_Only_2_On(); } else if(USBDeviceState == ADDRESS_STATE) { if(led_count == 0) { mLED_1_Toggle(); mLED_2_Off(); }//end if } else if(USBDeviceState == CONFIGURED_STATE) { if(led_count==0) { mLED_1_Toggle(); mLED_2 = !mLED_1; // Alternate blink }//end if }//end if(...) }//end if(UCONbits.SUSPND...) }//end BlinkUSBStatus /****************************************************************************** * Function: void ProcessIO(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: This function is a place holder for other user routines. * It is a mixture of both USB and non-USB tasks. * * Note: None *****************************************************************************/ void BootApplication(void) { unsigned char i; unsigned int j; DWORD_VAL FlashMemoryValue; if(BootState == IdleState) { //Are we done sending the last response. We need to be before we // receive the next command because we clear the PacketToPC buffer // once we receive a command if(!USBHandleBusy(USBInHandle)) { if(!USBHandleBusy(USBOutHandle)) //Did we receive a command? { for(i = 0; i < TotalPacketSize; i++) { PacketFromPC.Contents[i] = PacketFromPCBuffer.Contents[i]; } USBOutHandle = USBRxOnePacket(HID_EP,(BYTE*)&PacketFromPCBuffer,64); BootState = NotIdleState; //Prepare the next packet we will send to the host, by initializing the entire packet to 0x00. for(i = 0; i < TotalPacketSize; i++) { //This saves code space, since we don't have to do it independently in the QUERY_DEVICE and GET_DATA cases. PacketToPC.Contents[i] = 0; } } } } else //(BootState must be in NotIdleState) { switch(PacketFromPC.Command) { StartedProgramming = TRUE; case QUERY_DEVICE: { //Prepare a response packet, which lets the PC software know about the memory ranges of this device. PacketToPC.Command = (unsigned char)QUERY_DEVICE; PacketToPC.PacketDataFieldSize = (unsigned char)RequestDataBlockSize; PacketToPC.DeviceFamily = (unsigned char)DEVICE_FAMILY; PacketToPC.Type1 = (unsigned char)TypeProgramMemory; PacketToPC.Address1 = (unsigned long)ProgramMemStart; PacketToPC.Length1 = (unsigned long)(ProgramMemStopAddress - ProgramMemStart); //Size of program memory area PacketToPC.Type2 = (unsigned char)TypeEndOfTypeList; // if(ConfigsProtected == UNLOCKCONFIG) // { // PacketToPC.Type2 = (unsigned char)TypeProgramMemory; //Overwrite the 0xFF end of list indicator if we wish to program the Vectors. // PacketToPC.Address2 = (unsigned long)VectorsStart; // PacketToPC.Length2 = (unsigned long)(VectorsEnd - VectorsStart); //Size of program memory area // // PacketToPC.Type3 = (unsigned char)TypeConfigWords; // PacketToPC.Address3 = (unsigned long)ConfigWordsStartAddress; // PacketToPC.Length3 = (unsigned long)(ConfigWordsStopAddress - ConfigWordsStartAddress); // PacketToPC.Type4 = (unsigned char)TypeEndOfTypeList; // } //Init pad bytes to 0x00... Already done after we received the QUERY_DEVICE command (just after calling HIDRxPacket()). if(!USBHandleBusy(USBInHandle)) { USBInHandle = USBTxOnePacket(HID_EP,(BYTE*)&PacketToPC,64); BootState = IdleState; } } break; case UNLOCK_CONFIG: { if(PacketFromPC.LockValue == UNLOCKCONFIG) { MaxPageToErase = MaxPageToEraseWithConfigs; //Assume we will not allow erase/programming of config words (unless host sends override command) ProgramMemStopAddress = ProgramMemStopWithConfigs; ConfigsProtected = UNLOCKCONFIG; } else //LockValue must be == LOCKCONFIG { MaxPageToErase = MaxPageToEraseNoConfigs; ProgramMemStopAddress = ProgramMemStopNoConfigs; ConfigsProtected = LOCKCONFIG; } BootState = IdleState; } break; case ERASE_DEVICE: { void* pFlash = (void*)ProgramMemStart; int temp; for( temp = 0; temp < (MaxPageToErase); temp++ ) { NVMErasePage( pFlash + (temp*FLASH_PAGE_SIZE) ); USBDeviceTasks(); //Call USBDriverService() periodically to prevent falling off the bus if any SETUP packets should happen to arrive. } NVMCONbits.WREN = 0; //Good practice to clear WREN bit anytime we are not expecting to do erase/write operations, further reducing probability of accidental activation. BootState = IdleState; } break; case PROGRAM_DEVICE: { if(ProgrammedPointer == (unsigned long)InvalidAddress) ProgrammedPointer = PacketFromPC.Address; if(ProgrammedPointer == (unsigned long)PacketFromPC.Address) { for(i = 0; i < (PacketFromPC.Size/WORDSIZE); i++) { unsigned int index; index = (RequestDataBlockSize-PacketFromPC.Size)/WORDSIZE+i; ProgrammingBuffer[BufferedDataIndex] = PacketFromPC.Data[(RequestDataBlockSize-PacketFromPC.Size)/WORDSIZE+i]; //Data field is right justified. Need to put it in the buffer left justified. BufferedDataIndex++; ProgrammedPointer+=WORDSIZE; if(BufferedDataIndex == (RequestDataBlockSize/WORDSIZE)) //Need to make sure it doesn't call WriteFlashSubBlock() unless BufferedDataIndex/2 is an integer { WriteFlashSubBlock(); } } } //else host sent us a non-contiguous packet address... to make this firmware simpler, host should not do this without sending a PROGRAM_COMPLETE command in between program sections. BootState = IdleState; } break; case PROGRAM_COMPLETE: { INTDisableInterrupts(); WriteFlashSubBlock(); ProgrammedPointer = InvalidAddress; //Reinitialize pointer to an invalid range, so we know the next PROGRAM_DEVICE will be the start address of a contiguous section. BootState = IdleState; } break; case GET_DATA: { INTDisableInterrupts(); if(!USBHandleBusy(USBInHandle)) { //Init pad bytes to 0x00... Already done after we received the QUERY_DEVICE command (just after calling HIDRxReport()). PacketToPC.Command = GET_DATA; PacketToPC.Address = PacketFromPC.Address; PacketToPC.Size = PacketFromPC.Size; for(i = 0; i < (PacketFromPC.Size/WORDSIZE); i++) { DWORD* p; DWORD data; p = ((DWORD*)((PacketFromPC.Address+(i*WORDSIZE))|0x80000000)); data = *p; PacketToPC.Data[RequestDataBlockSize/WORDSIZE + i - PacketFromPC.Size/WORDSIZE] = *((DWORD*)((PacketFromPC.Address+(i*WORDSIZE))|0x80000000)); } USBInHandle = USBTxOnePacket(HID_EP,(BYTE*)&PacketToPC.Contents[0],64); BootState = IdleState; } } break; case RESET_DEVICE: { U1CON = 0x0000; //Disable USB module //And wait awhile for the USB cable capacitance to discharge down to disconnected (SE0) state. //Otherwise host might not realize we disconnected/reconnected when we do the reset. //A basic for() loop decrementing a 16 bit number would be simpler, but seems to take more code space for //a given delay. So do this instead: for(j = 0; j < 0xFFFF; j++) { Nop(); } Reset(); } break; }//End switch }//End if/else }//End ProcessIO() void WriteFlashSubBlock(void) //Use word writes to write code chunks less than a full 64 byte block size. { unsigned int i = 0; #if defined(__C30__) DWORD_VAL Address; NVMCON = 0x4003; //Perform WORD write next time WR gets set = 1. while(BufferedDataIndex > 0) //While data is still in the buffer. { Address.Val = (ProgrammedPointer - BufferedDataIndex); TBLPAG = Address.word.HW; __builtin_tblwtl(Address.word.LW, ProgrammingBuffer[i]); //Write the low word to the latch __builtin_tblwth(Address.word.LW, ProgrammingBuffer[i + 1]); //Write the high word to the latch (8 bits of data + 8 bits of "phantom data") i = i + 2; asm("DISI #16"); //Disable interrupts for next few instructions for unlock sequence __builtin_write_NVM(); while(NVMCONbits.WR == 1){} BufferedDataIndex = BufferedDataIndex - 2; //Used up 2 (16-bit) words from the buffer. } NVMCONbits.WREN = 0; //Good practice to clear WREN bit anytime we are not expecting to do erase/write operations, further reducing probability of accidental activation. #else DWORD_VAL Address; while(BufferedDataIndex > 0) //While data is still in the buffer. { Address.Val = (ProgrammedPointer - (BufferedDataIndex * WORDSIZE)); NVMWriteWord((DWORD*)Address.Val, (unsigned int)ProgrammingBuffer[i++]); BufferedDataIndex = BufferedDataIndex - 1; //Used up 2 (16-bit) words from the buffer. } Nop(); #endif } /********************************************************************* * Function: DWORD ReadProgramMemory(DWORD address) * * PreCondition: None * * Input: Program memory address to read from. Should be * an even number. * * Output: Program word at the specified address. For the * PIC24, dsPIC, etc. which have a 24 bit program * word size, the upper byte is 0x00. * * Side Effects: None * * Overview: Modifies and restores TBLPAG. Make sure that if * using interrupts and the PSV feature of the CPU * in an ISR that the TBLPAG register is preloaded * with the correct value (rather than assuming * TBLPAG is always pointing to the .const section. * * Note: None ********************************************************************/ DWORD ReadProgramMemory(DWORD address) { #if defined(__C30__) DWORD_VAL dwvResult; WORD wTBLPAGSave; wTBLPAGSave = TBLPAG; TBLPAG = ((DWORD_VAL*)&address)->w[1]; dwvResult.w[1] = __builtin_tblrdh((WORD)address); dwvResult.w[0] = __builtin_tblrdl((WORD)address); TBLPAG = wTBLPAGSave; return dwvResult.Val; #else #endif } // ****************************************************************************************************** // ************** USB Callback Functions **************************************************************** // ****************************************************************************************************** // The USB firmware stack will call the callback functions USBCBxxx() in response to certain USB related // events. For example, if the host PC is powering down, it will stop sending out Start of Frame (SOF) // packets to your device. In response to this, all USB devices are supposed to decrease their power // consumption from the USB Vbus to <2.5mA each. The USB module detects this condition (which according // to the USB specifications is 3+ms of no bus activity/SOF packets) and then calls the USBCBSuspend() // function. You should modify these callback functions to take appropriate actions for each of these // conditions. For example, in the USBCBSuspend(), you may wish to add code that will decrease power // consumption from Vbus to <2.5mA (such as by clock switching, turning off LEDs, putting the // microcontroller to sleep, etc.). Then, in the USBCBWakeFromSuspend() function, you may then wish to // add code that undoes the power saving things done in the USBCBSuspend() function. // The USBCBSendResume() function is special, in that the USB stack will not automatically call this // function. This function is meant to be called from the application firmware instead. See the // additional comments near the function. /****************************************************************************** * Function: void USBCBSuspend(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: Call back that is invoked when a USB suspend is detected * * Note: None *****************************************************************************/ void USBCBSuspend(void) { //Example power saving code. Insert appropriate code here for the desired //application behavior. If the microcontroller will be put to sleep, a //process similar to that shown below may be used: //ConfigureIOPinsForLowPower(); //SaveStateOfAllInterruptEnableBits(); //DisableAllInterruptEnableBits(); //EnableOnlyTheInterruptsWhichWillBeUsedToWakeTheMicro(); //should enable at least USBActivityIF as a wake source //Sleep(); //RestoreStateOfAllPreviouslySavedInterruptEnableBits(); //Preferrably, this should be done in the USBCBWakeFromSuspend() function instead. //RestoreIOPinsToNormal(); //Preferrably, this should be done in the USBCBWakeFromSuspend() function instead. //IMPORTANT NOTE: Do not clear the USBActivityIF (ACTVIF) bit here. This bit is //cleared inside the usb_device.c file. Clearing USBActivityIF here will cause //things to not work as intended. #if defined(__C30__) #if 0 U1EIR = 0xFFFF; U1IR = 0xFFFF; U1OTGIR = 0xFFFF; IFS5bits.USB1IF = 0; IEC5bits.USB1IE = 1; U1OTGIEbits.ACTVIE = 1; U1OTGIRbits.ACTVIF = 1; Sleep(); #endif #endif } /****************************************************************************** * Function: void _USB1Interrupt(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: This function is called when the USB interrupt bit is set * In this example the interrupt is only used when the device * goes to sleep when it receives a USB suspend command * * Note: None *****************************************************************************/ #if 0 void __attribute__ ((interrupt)) _USB1Interrupt(void) { #if !defined(self_powered) if(U1OTGIRbits.ACTVIF) { IEC5bits.USB1IE = 0; U1OTGIEbits.ACTVIE = 0; IFS5bits.USB1IF = 0; //USBClearInterruptFlag(USBActivityIFReg,USBActivityIFBitNum); USBClearInterruptFlag(USBIdleIFReg,USBIdleIFBitNum); //USBSuspendControl = 0; } #endif } #endif /****************************************************************************** * Function: void USBCBWakeFromSuspend(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: The host may put USB peripheral devices in low power * suspend mode (by "sending" 3+ms of idle). Once in suspend * mode, the host may wake the device back up by sending non- * idle state signalling. * * This call back is invoked when a wakeup from USB suspend * is detected. * * Note: None *****************************************************************************/ void USBCBWakeFromSuspend(void) { // If clock switching or other power savings measures were taken when // executing the USBCBSuspend() function, now would be a good time to // switch back to normal full power run mode conditions. The host allows // a few milliseconds of wakeup time, after which the device must be // fully back to normal, and capable of receiving and processing USB // packets. In order to do this, the USB module must receive proper // clocking (IE: 48MHz clock must be available to SIE for full speed USB // operation). } /******************************************************************** * Function: void USBCB_SOF_Handler(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: The USB host sends out a SOF packet to full-speed * devices every 1 ms. This interrupt may be useful * for isochronous pipes. End designers should * implement callback routine as necessary. * * Note: None *******************************************************************/ void USBCB_SOF_Handler(void) { // No need to clear UIRbits.SOFIF to 0 here. // Callback caller is already doing that. } /******************************************************************* * Function: void USBCBErrorHandler(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: The purpose of this callback is mainly for * debugging during development. Check UEIR to see * which error causes the interrupt. * * Note: None *******************************************************************/ void USBCBErrorHandler(void) { // No need to clear UEIR to 0 here. // Callback caller is already doing that. // Typically, user firmware does not need to do anything special // if a USB error occurs. For example, if the host sends an OUT // packet to your device, but the packet gets corrupted (ex: // because of a bad connection, or the user unplugs the // USB cable during the transmission) this will typically set // one or more USB error interrupt flags. Nothing specific // needs to be done however, since the SIE will automatically // send a "NAK" packet to the host. In response to this, the // host will normally retry to send the packet again, and no // data loss occurs. The system will typically recover // automatically, without the need for application firmware // intervention. // Nevertheless, this callback function is provided, such as // for debugging purposes. } /******************************************************************* * Function: void USBCBCheckOtherReq(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: When SETUP packets arrive from the host, some * firmware must process the request and respond * appropriately to fulfill the request. Some of * the SETUP packets will be for standard * USB "chapter 9" (as in, fulfilling chapter 9 of * the official USB specifications) requests, while * others may be specific to the USB device class * that is being implemented. For example, a HID * class device needs to be able to respond to * "GET REPORT" type of requests. This * is not a standard USB chapter 9 request, and * therefore not handled by usb_device.c. Instead * this request should be handled by class specific * firmware, such as that contained in usb_function_hid.c. * * Note: None *******************************************************************/ void USBCBCheckOtherReq(void) { USBCheckHIDRequest(); }//end /******************************************************************* * Function: void USBCBStdSetDscHandler(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: The USBCBStdSetDscHandler() callback function is * called when a SETUP, bRequest: SET_DESCRIPTOR request * arrives. Typically SET_DESCRIPTOR requests are * not used in most applications, and it is * optional to support this type of request. * * Note: None *******************************************************************/ void USBCBStdSetDscHandler(void) { // Must claim session ownership if supporting this request }//end /******************************************************************* * Function: void USBCBInitEP(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: This function is called when the device becomes * initialized, which occurs after the host sends a * SET_CONFIGURATION (wValue not = 0) request. This * callback function should initialize the endpoints * for the device's usage according to the current * configuration. * * Note: None *******************************************************************/ void USBCBInitEP(void) { //enable the HID endpoint USBEnableEndpoint(HID_EP,USB_IN_ENABLED|USB_OUT_ENABLED|USB_HANDSHAKE_ENABLED|USB_DISALLOW_SETUP); //Arm the OUT endpoint for the first packet USBOutHandle = HIDRxPacket(HID_EP,(BYTE*)&PacketFromPCBuffer,64); } /******************************************************************** * Function: void USBCBSendResume(void) * * PreCondition: None * * Input: None * * Output: None * * Side Effects: None * * Overview: The USB specifications allow some types of USB * peripheral devices to wake up a host PC (such * as if it is in a low power suspend to RAM state). * This can be a very useful feature in some * USB applications, such as an Infrared remote * control receiver. If a user presses the "power" * button on a remote control, it is nice that the * IR receiver can detect this signalling, and then * send a USB "command" to the PC to wake up. * * The USBCBSendResume() "callback" function is used * to send this special USB signalling which wakes * up the PC. This function may be called by * application firmware to wake up the PC. This * function should only be called when: * * 1. The USB driver used on the host PC supports * the remote wakeup capability. * 2. The USB configuration descriptor indicates * the device is remote wakeup capable in the * bmAttributes field. * 3. The USB host PC is currently sleeping, * and has previously sent your device a SET * FEATURE setup packet which "armed" the * remote wakeup capability. * * This callback should send a RESUME signal that * has the period of 1-15ms. * * Note: Interrupt vs. Polling * -Primary clock * -Secondary clock ***** MAKE NOTES ABOUT THIS ******* * > Can switch to primary first by calling USBCBWakeFromSuspend() * The modifiable section in this routine should be changed * to meet the application needs. Current implementation * temporary blocks other functions from executing for a * period of 1-13 ms depending on the core frequency. * * According to USB 2.0 specification section 7.1.7.7, * "The remote wakeup device must hold the resume signaling * for at lest 1 ms but for no more than 15 ms." * The idea here is to use a delay counter loop, using a * common value that would work over a wide range of core * frequencies. * That value selected is 1800. See table below: * ========================================================== * Core Freq(MHz) MIP RESUME Signal Period (ms) * ========================================================== * 48 12 1.05 * 4 1 12.6 * ========================================================== * * These timing could be incorrect when using code * optimization or extended instruction mode, * or when having other interrupts enabled. * Make sure to verify using the MPLAB SIM's Stopwatch * and verify the actual signal on an oscilloscope. *******************************************************************/ void USBCBSendResume(void) { static WORD delay_count; USBResumeControl = 1; // Start RESUME signaling delay_count = 1800U; // Set RESUME line for 1-13 ms do { delay_count--; }while(delay_count); USBResumeControl = 0; } /******************************************************************* * Function: BOOL USER_USB_CALLBACK_EVENT_HANDLER( * USB_EVENT event, void *pdata, WORD size) * * PreCondition: None * * Input: USB_EVENT event - the type of event * void *pdata - pointer to the event data * WORD size - size of the event data * * Output: None * * Side Effects: None * * Overview: This function is called from the USB stack to * notify a user application that a USB event * occured. This callback is in interrupt context * when the USB_INTERRUPT option is selected. * * Note: None *******************************************************************/ BOOL USER_USB_CALLBACK_EVENT_HANDLER(USB_EVENT event, void *pdata, WORD size) { switch(event) { case EVENT_CONFIGURED: USBCBInitEP(); break; case EVENT_SET_DESCRIPTOR: USBCBStdSetDscHandler(); break; case EVENT_EP0_REQUEST: USBCBCheckOtherReq(); break; case EVENT_SOF: USBCB_SOF_Handler(); break; case EVENT_SUSPEND: USBCBSuspend(); break; case EVENT_RESUME: USBCBWakeFromSuspend(); break; case EVENT_BUS_ERROR: USBCBErrorHandler(); break; case EVENT_TRANSFER: Nop(); break; default: break; } return TRUE; } /** EOF main.c *************************************************/ #endif