3 Copyright (C) Dean Camera, 2017.
5 dean [at] fourwalledcubicle [dot] com
10 Copyright 2017 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 Mass Storage class bootloader. This file contains the complete bootloader logic.
36 #define INCLUDE_FROM_BOOTLOADER_MASSSTORAGE_C
37 #include "BootloaderMassStorage.h"
39 /** LUFA Mass Storage Class driver interface configuration and state information. This structure is
40 * passed to all Mass Storage Class driver functions, so that multiple instances of the same class
41 * within a device can be differentiated from one another.
43 USB_ClassInfo_MS_Device_t Disk_MS_Interface =
47 .InterfaceNumber = INTERFACE_ID_MassStorage,
50 .Address = MASS_STORAGE_IN_EPADDR,
51 .Size = MASS_STORAGE_IO_EPSIZE,
56 .Address = MASS_STORAGE_OUT_EPADDR,
57 .Size = MASS_STORAGE_IO_EPSIZE,
64 /** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
65 * via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
66 * started via a forced watchdog reset.
68 bool RunBootloader = true;
70 /** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
71 * 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
72 * low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
73 * \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
75 uint16_t MagicBootKey ATTR_NO_INIT;
77 /** Indicates if the bootloader is allowed to exit immediately if \ref RunBootloader is \c false. During shutdown all
78 * pending commands must be processed before jumping to the user-application, thus this tracks the main program loop
79 * iterations since a SCSI command from the host was received.
81 static uint8_t TicksSinceLastCommand = 0;
84 /** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
85 * start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
86 * this will force the user application to start via a software jump.
88 void Application_Jump_Check(void)
90 bool JumpToApplication = false;
92 #if (BOARD == BOARD_LEONARDO)
93 /* Enable pull-up on the IO13 pin so we can use it to select the mode */
97 /* If IO13 is not jumpered to ground, start the user application instead */
98 JumpToApplication = ((PINC & (1 << 7)) != 0);
100 /* Disable pull-up after the check has completed */
102 #elif ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
103 /* Disable JTAG debugging */
106 /* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
110 /* If the TCK pin is not jumpered to ground, start the user application instead */
111 JumpToApplication = ((PINF & (1 << 4)) != 0);
113 /* Re-enable JTAG debugging */
116 /* Check if the device's BOOTRST fuse is set */
117 if (boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
119 /* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
120 if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))
121 JumpToApplication = true;
123 /* Clear reset source */
124 MCUSR &= ~(1 << EXTRF);
128 /* If the reset source was the bootloader and the key is correct, clear it and jump to the application;
129 * this can happen in the HWBE fuse is set, and the HBE pin is low during the watchdog reset */
130 if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
131 JumpToApplication = true;
133 /* Clear reset source */
134 MCUSR &= ~(1 << WDRF);
138 /* Don't run the user application if the reset vector is blank (no app loaded) */
139 bool ApplicationValid = (pgm_read_word_near(0) != 0xFFFF);
141 /* If a request has been made to jump to the user application, honor it */
142 if (JumpToApplication && ApplicationValid)
144 /* Turn off the watchdog */
145 MCUSR &= ~(1 << WDRF);
148 /* Clear the boot key and jump to the user application */
151 // cppcheck-suppress constStatement
152 ((void (*)(void))0x0000)();
156 /** Main program entry point. This routine configures the hardware required by the application, then
157 * enters a loop to run the application tasks in sequence.
163 LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
164 GlobalInterruptEnable();
166 while (RunBootloader || TicksSinceLastCommand++ < 0xFF)
168 MS_Device_USBTask(&Disk_MS_Interface);
172 /* Disconnect from the host - USB interface will be reset later along with the AVR */
175 /* Unlock the forced application start mode of the bootloader if it is restarted */
176 MagicBootKey = MAGIC_BOOT_KEY;
178 /* Enable the watchdog and force a timeout to reset the AVR */
179 wdt_enable(WDTO_250MS);
184 /** Configures the board hardware and chip peripherals for the demo's functionality. */
185 static void SetupHardware(void)
187 /* Disable watchdog if enabled by bootloader/fuses */
188 MCUSR &= ~(1 << WDRF);
191 /* Disable clock division */
192 clock_prescale_set(clock_div_1);
194 /* Relocate the interrupt vector table to the bootloader section */
196 MCUCR = (1 << IVSEL);
198 /* Hardware Initialization */
202 /* Bootloader active LED toggle timer initialization */
203 TIMSK1 = (1 << TOIE1);
204 TCCR1B = ((1 << CS11) | (1 << CS10));
207 /** ISR to periodically toggle the LEDs on the board to indicate that the bootloader is active. */
208 ISR(TIMER1_OVF_vect, ISR_BLOCK)
210 LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2);
213 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
214 void EVENT_USB_Device_Connect(void)
216 /* Indicate USB enumerating */
217 LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
220 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
221 * the status LEDs and stops the Mass Storage management task.
223 void EVENT_USB_Device_Disconnect(void)
225 /* Indicate USB not ready */
226 LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
229 /** Event handler for the library USB Configuration Changed event. */
230 void EVENT_USB_Device_ConfigurationChanged(void)
232 bool ConfigSuccess = true;
234 /* Setup Mass Storage Data Endpoints */
235 ConfigSuccess &= MS_Device_ConfigureEndpoints(&Disk_MS_Interface);
237 /* Indicate endpoint configuration success or failure */
238 LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
241 /** Event handler for the library USB Control Request reception event. */
242 void EVENT_USB_Device_ControlRequest(void)
244 MS_Device_ProcessControlRequest(&Disk_MS_Interface);
247 /** Mass Storage class driver callback function the reception of SCSI commands from the host, which must be processed.
249 * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface configuration structure being referenced
251 bool CALLBACK_MS_Device_SCSICommandReceived(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
255 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
256 CommandSuccess = SCSI_DecodeSCSICommand(MSInterfaceInfo);
257 LEDs_SetAllLEDs(LEDMASK_USB_READY);
259 /* Signal that a command was processed, must not exit bootloader yet */
260 TicksSinceLastCommand = 0;
262 return CommandSuccess;