1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
LUFA Library
Copyright (C) Dean Camera, 2013.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2013 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))
{
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();
/* 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
{
/* 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;
}
}
|
