diff options
Diffstat (limited to 'tmk_core/protocol/lufa/LUFA-git/Bootloaders/Printer/BootloaderPrinter.c')
| -rw-r--r-- | tmk_core/protocol/lufa/LUFA-git/Bootloaders/Printer/BootloaderPrinter.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/tmk_core/protocol/lufa/LUFA-git/Bootloaders/Printer/BootloaderPrinter.c b/tmk_core/protocol/lufa/LUFA-git/Bootloaders/Printer/BootloaderPrinter.c new file mode 100644 index 0000000000..a19cb06746 --- /dev/null +++ b/tmk_core/protocol/lufa/LUFA-git/Bootloaders/Printer/BootloaderPrinter.c @@ -0,0 +1,431 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2014. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2014 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 Printer class bootloader. This file contains the complete bootloader logic. + */ + +#include "BootloaderPrinter.h" + +/** LUFA Printer Class driver interface configuration and state information. This structure is + * passed to all Printer Class driver functions, so that multiple instances of the same class + * within a device can be differentiated from one another. + */ +USB_ClassInfo_PRNT_Device_t TextOnly_Printer_Interface = + { + .Config = + { + .InterfaceNumber = INTERFACE_ID_Printer, + .DataINEndpoint = + { + .Address = PRINTER_IN_EPADDR, + .Size = PRINTER_IO_EPSIZE, + .Banks = 1, + }, + .DataOUTEndpoint = + { + .Address = PRINTER_OUT_EPADDR, + .Size = PRINTER_IO_EPSIZE, + .Banks = 1, + }, + .IEEE1284String = + "MFG:Generic;" + "MDL:Generic_/_Text_Only;" + "CMD:1284.4;" + "CLS:PRINTER", + }, + }; + +/** Intel HEX parser state machine state information, to track the contents of + * a HEX file streamed in as a sequence of arbitrary bytes. + */ +struct +{ + /** Current HEX parser state machine state. */ + uint8_t ParserState; + /** Previously decoded numerical byte of data. */ + uint8_t PrevData; + /** Currently decoded numerical byte of data. */ + uint8_t Data; + /** Indicates if both bytes that correspond to a single decoded numerical + * byte of data (HEX encodes values in ASCII HEX, two characters per byte) + * have been read. + */ + bool ReadMSB; + /** Intel HEX record type of the current Intel HEX record. */ + uint8_t RecordType; + /** Numerical bytes of data remaining to be read in the current record. */ + uint8_t DataRem; + /** Checksum of the current record received so far. */ + uint8_t Checksum; + /** Starting address of the last addressed FLASH page. */ + uint32_t PageStartAddress; + /** Current 32-bit byte extended base address in FLASH being targeted. */ + uint32_t CurrBaseAddress; + /** Current 32-bit byte address in FLASH being targeted. */ + uint32_t CurrAddress; +} HEXParser; + +/** Indicates if there is data waiting to be written to a physical page of + * memory in FLASH. + */ +static bool PageDirty = false; + +/** 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)(); + } +} + +/** + * Converts a given input byte of data from an ASCII encoded HEX value to an integer value. + * + * \note Input HEX bytes are expected to be in uppercase only. + * + * \param[in] Byte ASCII byte of data to convert + * + * \return Integer converted value of the input ASCII encoded HEX byte of data, or -1 if the + * input is not valid ASCII encoded HEX. + */ +static int8_t HexToDecimal(const char Byte) +{ + if ((Byte >= 'A') && (Byte <= 'F')) + return (10 + (Byte - 'A')); + else if ((Byte >= '0') && (Byte <= '9')) + return (Byte - '0'); + + return -1; +} + +/** + * Flushes a partially written page of data to physical FLASH, if a page + * boundary has been crossed. + * + * \note If a page flush occurs the global HEX parser state is updated. + */ +static void FlushPageIfRequired(void) +{ + /* Abort if no data has been buffered for writing to the current page */ + if (!PageDirty) + return; + + /* Flush the FLASH page to physical memory if we are crossing a page boundary */ + uint32_t NewPageStartAddress = (HEXParser.CurrAddress & ~(SPM_PAGESIZE - 1)); + if (HEXParser.PageStartAddress != NewPageStartAddress) + { + boot_page_write(HEXParser.PageStartAddress); + boot_spm_busy_wait(); + + HEXParser.PageStartAddress = NewPageStartAddress; + + PageDirty = false; + } +} + +/** + * Parses an input Intel HEX formatted stream one character at a time, loading + * the data contents into the device's internal FLASH memory. + * + * \param[in] ReadCharacter Next input ASCII byte of data to parse + */ +static void ParseIntelHEXByte(const char ReadCharacter) +{ + /* Reset the line parser while waiting for a new line to start */ + if ((HEXParser.ParserState == HEX_PARSE_STATE_WAIT_LINE) || (ReadCharacter == ':')) + { + HEXParser.Checksum = 0; + HEXParser.CurrAddress = HEXParser.CurrBaseAddress; + HEXParser.ReadMSB = false; + + /* ASCII ':' indicates the start of a new HEX record */ + if (ReadCharacter == ':') + HEXParser.ParserState = HEX_PARSE_STATE_BYTE_COUNT; + + return; + } + + /* Only allow ASCII HEX encoded digits, ignore all other characters */ + int8_t ReadCharacterDec = HexToDecimal(ReadCharacter); + if (ReadCharacterDec < 0) + return; + + /* Read and convert the next nibble of data from the current character */ + HEXParser.Data = (HEXParser.Data << 4) | ReadCharacterDec; + HEXParser.ReadMSB = !HEXParser.ReadMSB; + + /* Only process further when a full byte (two nibbles) have been read */ + if (HEXParser.ReadMSB) + return; + + /* Intel HEX checksum is for all fields except starting character and the + * checksum itself + */ + if (HEXParser.ParserState != HEX_PARSE_STATE_CHECKSUM) + HEXParser.Checksum += HEXParser.Data; + + switch (HEXParser.ParserState) + { + case HEX_PARSE_STATE_BYTE_COUNT: + HEXParser.DataRem = HEXParser.Data; + HEXParser.ParserState = HEX_PARSE_STATE_ADDRESS_HIGH; + break; + + case HEX_PARSE_STATE_ADDRESS_HIGH: + HEXParser.CurrAddress += ((uint16_t)HEXParser.Data << 8); + HEXParser.ParserState = HEX_PARSE_STATE_ADDRESS_LOW; + break; + + case HEX_PARSE_STATE_ADDRESS_LOW: + HEXParser.CurrAddress += HEXParser.Data; + HEXParser.ParserState = HEX_PARSE_STATE_RECORD_TYPE; + break; + + case HEX_PARSE_STATE_RECORD_TYPE: + HEXParser.RecordType = HEXParser.Data; + HEXParser.ParserState = (HEXParser.DataRem ? HEX_PARSE_STATE_READ_DATA : HEX_PARSE_STATE_CHECKSUM); + break; + + case HEX_PARSE_STATE_READ_DATA: + /* Track the number of read data bytes in the record */ + HEXParser.DataRem--; + + /* Protect the bootloader against being written to */ + if (HEXParser.CurrAddress >= BOOT_START_ADDR) + { + HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE; + PageDirty = false; + return; + } + + /* Wait for a machine word (two bytes) of data to be read */ + if (HEXParser.DataRem & 0x01) + { + HEXParser.PrevData = HEXParser.Data; + break; + } + + /* Convert the last two received data bytes into a 16-bit word */ + uint16_t NewDataWord = ((uint16_t)HEXParser.Data << 8) | HEXParser.PrevData; + + switch (HEXParser.RecordType) + { + case HEX_RECORD_TYPE_Data: + /* If we are writing to a new page, we need to erase it first */ + if (!(PageDirty)) + { + boot_page_erase(HEXParser.PageStartAddress); + boot_spm_busy_wait(); + + PageDirty = true; + } + + /* Fill the FLASH memory buffer with the new word of data */ + boot_page_fill(HEXParser.CurrAddress, NewDataWord); + HEXParser.CurrAddress += 2; + + /* Flush the FLASH page to physical memory if we are crossing a page boundary */ + FlushPageIfRequired(); + break; + + case HEX_RECORD_TYPE_ExtendedSegmentAddress: + /* Extended address data - store the upper 12-bits of the new address */ + HEXParser.CurrBaseAddress = ((uint32_t)NewDataWord << 4); + break; + + case HEX_RECORD_TYPE_ExtendedLinearAddress: + /* Extended address data - store the upper 16-bits of the new address */ + HEXParser.CurrBaseAddress = ((uint32_t)NewDataWord << 16); + break; + } + + if (!HEXParser.DataRem) + HEXParser.ParserState = HEX_PARSE_STATE_CHECKSUM; + break; + + case HEX_PARSE_STATE_CHECKSUM: + /* Verify checksum of the completed record */ + if (HEXParser.Data != ((~HEXParser.Checksum + 1) & 0xFF)) + break; + + /* Flush the FLASH page to physical memory if we are crossing a page boundary */ + FlushPageIfRequired(); + + /* If end of the HEX file reached, the bootloader should exit at next opportunity */ + if (HEXParser.RecordType == HEX_RECORD_TYPE_EndOfFile) + RunBootloader = false; + + break; + + default: + HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE; + break; + } +} + +/** Main program entry point. This routine configures the hardware required by the application, then + * enters a loop to run the application tasks in sequence. + */ +int main(void) +{ + SetupHardware(); + + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); + GlobalInterruptEnable(); + + while (RunBootloader) + { + uint8_t BytesReceived = PRNT_Device_BytesReceived(&TextOnly_Printer_Interface); + + if (BytesReceived) + { + LEDs_SetAllLEDs(LEDMASK_USB_BUSY); + + while (BytesReceived--) + { + int16_t ReceivedByte = PRNT_Device_ReceiveByte(&TextOnly_Printer_Interface); + + /* Feed the next byte of data to the HEX parser */ + ParseIntelHEXByte(ReceivedByte); + } + + LEDs_SetAllLEDs(LEDMASK_USB_READY); + } + + PRNT_Device_USBTask(&TextOnly_Printer_Interface); + 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 the board hardware and chip peripherals for the demo's functionality. */ +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); + + /* Hardware Initialization */ + LEDs_Init(); + USB_Init(); + + /* Bootloader active LED toggle timer initialization */ + TIMSK1 = (1 << TOIE1); + TCCR1B = ((1 << CS11) | (1 << CS10)); +} + +/** ISR to periodically toggle the LEDs on the board to indicate that the bootloader is active. */ +ISR(TIMER1_OVF_vect, ISR_BLOCK) +{ + LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2); +} + +/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */ +void EVENT_USB_Device_Connect(void) +{ + /* Indicate USB enumerating */ + LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); +} + +/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via + * the status LEDs and stops the Printer management task. + */ +void EVENT_USB_Device_Disconnect(void) +{ + /* Indicate USB not ready */ + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); +} + +/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration + * of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started. + */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + bool ConfigSuccess = true; + + /* Setup Printer Data Endpoints */ + ConfigSuccess &= PRNT_Device_ConfigureEndpoints(&TextOnly_Printer_Interface); + + /* Reset the HEX parser upon successful connection to a host */ + HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE; + + /* Indicate endpoint configuration success or failure */ + LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); +} + +/** 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) +{ + PRNT_Device_ProcessControlRequest(&TextOnly_Printer_Interface); +} |