You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
199 lines
6.4 KiB
199 lines
6.4 KiB
8 years ago
|
/*
|
||
|
|
LUFA Library
|
||
|
|
Copyright (C) Dean Camera, 2017.
|
||
|
|
|
||
|
|
dean [at] fourwalledcubicle [dot] com
|
||
|
|
www.lufa-lib.org
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
||
|
|
|
||
|
|
Permission to use, copy, modify, distribute, and sell this
|
||
|
|
software and its documentation for any purpose is hereby granted
|
||
|
|
without fee, 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 disclaims 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 HID class bootloader. This file contains the complete bootloader logic.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "BootloaderHID.h"
|
||
|
|
|
||
|
|
/** 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.
|
||
|
|
*/
|
||
|
|
static bool RunBootloader = true;
|
||
|
|
|
||
|
|
/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
|
||
|
|
* 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
|
||
|
|
* low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
|
||
|
|
* \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
|
||
|
|
*/
|
||
|
|
uint16_t MagicBootKey ATTR_NO_INIT;
|
||
|
|
|
||
|
|
|
||
|
|
/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
|
||
|
|
* start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
|
||
|
|
* this will force the user application to start via a software jump.
|
||
|
|
*/
|
||
|
|
void Application_Jump_Check(void)
|
||
|
|
{
|
||
|
|
/* If the reset source was the bootloader and the key is correct, clear it and jump to the application */
|
||
|
|
if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
|
||
|
|
{
|
||
|
|
/* Turn off the watchdog */
|
||
|
|
MCUSR &= ~(1 << WDRF);
|
||
|
|
wdt_disable();
|
||
|
|
|
||
|
|
/* Clear the boot key and jump to the user application */
|
||
|
|
MagicBootKey = 0;
|
||
|
|
|
||
|
|
// cppcheck-suppress constStatement
|
||
|
|
((void (*)(void))0x0000)();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** 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)
|
||
|
|
{
|
||
|
|
/* Setup hardware required for the bootloader */
|
||
|
|
SetupHardware();
|
||
|
|
|
||
|
|
/* Enable global interrupts so that the USB stack can function */
|
||
|
|
GlobalInterruptEnable();
|
||
|
|
|
||
|
|
while (RunBootloader)
|
||
|
|
USB_USBTask();
|
||
|
|
|
||
|
|
/* Disconnect from the host - USB interface will be reset later along with the AVR */
|
||
|
|
USB_Detach();
|
||
|
|
|
||
|
|
/* Unlock the forced application start mode of the bootloader if it is restarted */
|
||
|
|
MagicBootKey = MAGIC_BOOT_KEY;
|
||
|
|
|
||
|
|
/* Enable the watchdog and force a timeout to reset the AVR */
|
||
|
|
wdt_enable(WDTO_250MS);
|
||
|
|
|
||
|
|
for (;;);
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Configures all hardware required for the bootloader. */
|
||
|
|
static void SetupHardware(void)
|
||
|
|
{
|
||
|
|
/* Disable watchdog if enabled by bootloader/fuses */
|
||
|
|
MCUSR &= ~(1 << WDRF);
|
||
|
|
wdt_disable();
|
||
|
|
|
||
|
|
/* Disable clock division */
|
||
|
|
clock_prescale_set(clock_div_1);
|
||
|
|
|
||
|
|
/* Relocate the interrupt vector table to the bootloader section */
|
||
|
|
MCUCR = (1 << IVCE);
|
||
|
|
MCUCR = (1 << IVSEL);
|
||
|
|
|
||
|
|
/* Initialize USB subsystem */
|
||
|
|
USB_Init();
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready
|
||
|
|
* to relay data to and from the attached USB host.
|
||
|
|
*/
|
||
|
|
void EVENT_USB_Device_ConfigurationChanged(void)
|
||
|
|
{
|
||
|
|
/* Setup HID Report Endpoint */
|
||
|
|
Endpoint_ConfigureEndpoint(HID_IN_EPADDR, EP_TYPE_INTERRUPT, HID_IN_EPSIZE, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
|
||
|
|
* the device from the USB host before passing along unhandled control requests to the library for processing
|
||
|
|
* internally.
|
||
|
|
*/
|
||
|
|
void EVENT_USB_Device_ControlRequest(void)
|
||
|
|
{
|
||
|
|
/* Ignore any requests that aren't directed to the HID interface */
|
||
|
|
if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) !=
|
||
|
|
(REQTYPE_CLASS | REQREC_INTERFACE))
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Process HID specific control requests */
|
||
|
|
switch (USB_ControlRequest.bRequest)
|
||
|
|
{
|
||
|
|
case HID_REQ_SetReport:
|
||
|
|
Endpoint_ClearSETUP();
|
||
|
|
|
||
|
|
/* Wait until the command has been sent by the host */
|
||
|
|
while (!(Endpoint_IsOUTReceived()));
|
||
|
|
|
||
|
|
/* Read in the write destination address */
|
||
|
|
#if (FLASHEND > 0xFFFF)
|
||
|
|
uint32_t PageAddress = ((uint32_t)Endpoint_Read_16_LE() << 8);
|
||
|
|
#else
|
||
|
|
uint16_t PageAddress = Endpoint_Read_16_LE();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Check if the command is a program page command, or a start application command */
|
||
|
|
#if (FLASHEND > 0xFFFF)
|
||
|
|
if ((uint16_t)(PageAddress >> 8) == COMMAND_STARTAPPLICATION)
|
||
|
|
#else
|
||
|
|
if (PageAddress == COMMAND_STARTAPPLICATION)
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
RunBootloader = false;
|
||
|
|
}
|
||
|
|
else if (PageAddress < BOOT_START_ADDR)
|
||
|
|
{
|
||
|
|
/* 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 PageWord = 0; PageWord < (SPM_PAGESIZE / 2); PageWord++)
|
||
|
|
{
|
||
|
|
/* Check if endpoint is empty - if so clear it and wait until ready for next packet */
|
||
|
|
if (!(Endpoint_BytesInEndpoint()))
|
||
|
|
{
|
||
|
|
Endpoint_ClearOUT();
|
||
|
|
while (!(Endpoint_IsOUTReceived()));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Write the next data word to the FLASH page */
|
||
|
|
boot_page_fill(PageAddress + ((uint16_t)PageWord << 1), Endpoint_Read_16_LE());
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Write the filled FLASH page to memory */
|
||
|
|
boot_page_write(PageAddress);
|
||
|
|
boot_spm_busy_wait();
|
||
|
|
|
||
|
|
/* Re-enable RWW section */
|
||
|
|
boot_rww_enable();
|
||
|
|
}
|
||
|
|
|
||
|
|
Endpoint_ClearOUT();
|
||
|
|
|
||
|
|
Endpoint_ClearStatusStage();
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|