/* LUFA Library Copyright (C) Dean Camera, 2009. dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ /* Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that the copyright notice and this permission notice and warranty disclaimer appear in supporting documentation, and that the name of the author not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The author disclaim all warranties with regard to this software, including all implied warranties of merchantability and fitness. In no event shall the author be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software. */ /** \file * * Main source file for the TeensyHID bootloader. This file contains the complete bootloader logic. */ #define INCLUDE_FROM_TEENSYHID_C #include "TeensyHID.h" /* Global Variables: */ /** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run * via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application * started via a forced watchdog reset. */ bool RunBootloader = true; /** Main program entry point. This routine configures the hardware required by the bootloader, then continuously * runs the bootloader processing routine until instructed to soft-exit. */ int main(void) { /* Disable watchdog if enabled by bootloader/fuses */ MCUSR &= ~(1 << WDRF); wdt_disable(); /* Disable Clock Division */ SetSystemClockPrescaler(0); /* Relocate the interrupt vector table to the bootloader section */ MCUCR = (1 << IVCE); MCUCR = (1 << IVSEL); /* Initialize USB subsystem */ USB_Init(); while (RunBootloader) USB_USBTask(); /* Shut down the USB interface, so that the host will register the disconnection */ USB_ShutDown(); /* Wait 100ms to give the host time to register the disconnection */ _delay_ms(100); /* Enable the watchdog and force a timeout to reset the AVR */ wdt_enable(WDTO_250MS); for (;;); } /** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready * to relay data to and from the attached USB host. */ EVENT_HANDLER(USB_ConfigurationChanged) { /* Setup HID Report Endpoint */ Endpoint_ConfigureEndpoint(HID_EPNUM, EP_TYPE_INTERRUPT, ENDPOINT_DIR_IN, HID_EPSIZE, ENDPOINT_BANK_SINGLE); } /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific * control requests that are not handled internally by the USB library (including the HID commands, which are * all issued via the control endpoint), so that they can be handled appropriately for the application. */ EVENT_HANDLER(USB_UnhandledControlPacket) { /* Handle HID Class specific requests */ switch (bRequest) { case REQ_SetReport: if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) { Endpoint_ClearSetupReceived(); /* Wait until the command (report) has been sent by the host */ while (!(Endpoint_IsSetupOUTReceived())); /* Read in the write destination address */ uint16_t PageAddress = Endpoint_Read_Word_LE(); /* Check if the command is a program page command, or a start application command */ if (PageAddress == TEENSY_STARTAPPLICATION) { RunBootloader = false; } else { /* Erase the given FLASH page, ready to be programmed */ boot_page_erase(PageAddress); boot_spm_busy_wait(); /* Write each of the FLASH page's bytes in sequence */ for (uint8_t PageByte = 0; PageByte < 128; PageByte += 2) { /* Check if endpoint is empty - if so clear it and wait until ready for next packet */ if (!(Endpoint_BytesInEndpoint())) { Endpoint_ClearSetupOUT(); while (!(Endpoint_IsSetupOUTReceived())); } /* Write the next data word to the FLASH page */ boot_page_fill(PageAddress + PageByte, Endpoint_Read_Word_LE()); } /* Write the filled FLASH page to memory */ boot_page_write(PageAddress); boot_spm_busy_wait(); /* Re-enable RWW section */ boot_rww_enable(); } Endpoint_ClearSetupOUT(); /* Wait until the host is ready to receive the request confirmation */ while (!(Endpoint_IsSetupINReady())); /* Handshake the request by sending an empty IN packet */ Endpoint_ClearSetupIN(); } break; } }