3 Copyright (C) Dean Camera, 2014.
5 dean [at] fourwalledcubicle [dot] com
10 Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com)
12 Permission to use, copy, modify, distribute, and sell this
13 software and its documentation for any purpose is hereby granted
14 without fee, provided that the above copyright notice appear in
15 all copies and that both that the copyright notice and this
16 permission notice and warranty disclaimer appear in supporting
17 documentation, and that the name of the author not be used in
18 advertising or publicity pertaining to distribution of the
19 software without specific, written prior permission.
21 The author disclaims all warranties with regard to this
22 software, including all implied warranties of merchantability
23 and fitness. In no event shall the author be liable for any
24 special, indirect or consequential damages or any damages
25 whatsoever resulting from loss of use, data or profits, whether
26 in an action of contract, negligence or other tortious action,
27 arising out of or in connection with the use or performance of
33 * Main source file for the HID class bootloader. This file contains the complete bootloader logic.
36 #include "BootloaderHID.h"
38 /** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
39 * via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
40 * started via a forced watchdog reset.
42 static bool RunBootloader = true;
44 /** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
45 * will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
46 * low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
47 * \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
49 uint16_t MagicBootKey ATTR_NO_INIT;
52 /** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
53 * start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
54 * this will force the user application to start via a software jump.
56 void Application_Jump_Check(void)
58 /* If the reset source was the bootloader and the key is correct, clear it and jump to the application */
59 if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
63 // cppcheck-suppress constStatement
64 ((void (*)(void))0x0000)();
68 /** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
69 * runs the bootloader processing routine until instructed to soft-exit.
73 /* Setup hardware required for the bootloader */
76 /* Enable global interrupts so that the USB stack can function */
77 GlobalInterruptEnable();
82 /* Disconnect from the host - USB interface will be reset later along with the AVR */
85 /* Unlock the forced application start mode of the bootloader if it is restarted */
86 MagicBootKey = MAGIC_BOOT_KEY;
88 /* Enable the watchdog and force a timeout to reset the AVR */
89 wdt_enable(WDTO_250MS);
94 /** Configures all hardware required for the bootloader. */
95 static void SetupHardware(void)
97 /* Disable watchdog if enabled by bootloader/fuses */
98 MCUSR &= ~(1 << WDRF);
101 /* Relocate the interrupt vector table to the bootloader section */
103 MCUCR = (1 << IVSEL);
105 /* Initialize USB subsystem */
109 /** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready
110 * to relay data to and from the attached USB host.
112 void EVENT_USB_Device_ConfigurationChanged(void)
114 /* Setup HID Report Endpoint */
115 Endpoint_ConfigureEndpoint(HID_IN_EPADDR, EP_TYPE_INTERRUPT, HID_IN_EPSIZE, 1);
118 /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
119 * the device from the USB host before passing along unhandled control requests to the library for processing
122 void EVENT_USB_Device_ControlRequest(void)
124 /* Ignore any requests that aren't directed to the HID interface */
125 if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) !=
126 (REQTYPE_CLASS | REQREC_INTERFACE))
131 /* Process HID specific control requests */
132 switch (USB_ControlRequest.bRequest)
134 case HID_REQ_SetReport:
135 Endpoint_ClearSETUP();
137 /* Wait until the command has been sent by the host */
138 while (!(Endpoint_IsOUTReceived()));
140 /* Read in the write destination address */
141 #if (FLASHEND > 0xFFFF)
142 uint32_t PageAddress = ((uint32_t)Endpoint_Read_16_LE() << 8);
144 uint16_t PageAddress = Endpoint_Read_16_LE();
147 /* Check if the command is a program page command, or a start application command */
148 #if (FLASHEND > 0xFFFF)
149 if ((uint16_t)(PageAddress >> 8) == COMMAND_STARTAPPLICATION)
151 if (PageAddress == COMMAND_STARTAPPLICATION)
154 RunBootloader = false;
158 /* Erase the given FLASH page, ready to be programmed */
159 boot_page_erase(PageAddress);
160 boot_spm_busy_wait();
162 /* Write each of the FLASH page's bytes in sequence */
163 for (uint8_t PageWord = 0; PageWord < (SPM_PAGESIZE / 2); PageWord++)
165 /* Check if endpoint is empty - if so clear it and wait until ready for next packet */
166 if (!(Endpoint_BytesInEndpoint()))
169 while (!(Endpoint_IsOUTReceived()));
172 /* Write the next data word to the FLASH page */
173 boot_page_fill(PageAddress + ((uint16_t)PageWord << 1), Endpoint_Read_16_LE());
176 /* Write the filled FLASH page to memory */
177 boot_page_write(PageAddress);
178 boot_spm_busy_wait();
180 /* Re-enable RWW section */
186 Endpoint_ClearStatusStage();