diff options
Diffstat (limited to 'Bootloaders/CDC/BootloaderCDC.c')
| -rw-r--r-- | Bootloaders/CDC/BootloaderCDC.c | 673 |
1 files changed, 673 insertions, 0 deletions
diff --git a/Bootloaders/CDC/BootloaderCDC.c b/Bootloaders/CDC/BootloaderCDC.c new file mode 100644 index 0000000000..aa17bc15bd --- /dev/null +++ b/Bootloaders/CDC/BootloaderCDC.c @@ -0,0 +1,673 @@ +/* + 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 CDC class bootloader. This file contains the complete bootloader logic. + */ + +#define INCLUDE_FROM_BOOTLOADERCDC_C +#include "BootloaderCDC.h" + +/** Contains the current baud rate and other settings of the first virtual serial port. This must be retained as some + * operating systems will not open the port unless the settings can be set successfully. + */ +static CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 0, + .CharFormat = CDC_LINEENCODING_OneStopBit, + .ParityType = CDC_PARITY_None, + .DataBits = 8 }; + +/** Current address counter. This stores the current address of the FLASH or EEPROM as set by the host, + * and is used when reading or writing to the AVRs memory (either FLASH or EEPROM depending on the issued + * command.) + */ +static uint32_t CurrAddress; + +/** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run + * via a watchdog reset. When cleared the bootloader will exit, starting the watchdog and entering an infinite + * loop until the AVR restarts and the application runs. + */ +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) +{ + bool JumpToApplication = false; + + #if (BOARD == BOARD_LEONARDO) + /* Enable pull-up on the IO13 pin so we can use it to select the mode */ + PORTC |= (1 << 7); + Delay_MS(10); + + /* If IO13 is not jumpered to ground, start the user application instead */ + JumpToApplication = ((PINC & (1 << 7)) != 0); + + /* Disable pull-up after the check has completed */ + PORTC &= ~(1 << 7); + #elif ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1)) + /* Disable JTAG debugging */ + JTAG_DISABLE(); + + /* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */ + PORTF |= (1 << 4); + Delay_MS(10); + + /* If the TCK pin is not jumpered to ground, start the user application instead */ + JumpToApplication = ((PINF & (1 << 4)) != 0); + + /* Re-enable JTAG debugging */ + JTAG_ENABLE(); + #else + /* Check if the device's BOOTRST fuse is set */ + if (boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST) + { + /* If the reset source was not an external reset or the key is correct, clear it and jump to the application */ + if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY)) + JumpToApplication = true; + + /* Clear reset source */ + MCUSR &= ~(1 << EXTRF); + } + else + { + /* If the reset source was the bootloader and the key is correct, clear it and jump to the application; + * this can happen in the HWBE fuse is set, and the HBE pin is low during the watchdog reset */ + if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY)) + JumpToApplication = true; + + /* Clear reset source */ + MCUSR &= ~(1 << WDRF); + } + #endif + + /* Don't run the user application if the reset vector is blank (no app loaded) */ + bool ApplicationValid = (pgm_read_word_near(0) != 0xFFFF); + + /* If a request has been made to jump to the user application, honor it */ + if (JumpToApplication && ApplicationValid) + { + /* 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, or hard-reset via the watchdog to start + * the loaded application code. + */ +int main(void) +{ + /* Setup hardware required for the bootloader */ + SetupHardware(); + + /* Turn on first LED on the board to indicate that the bootloader has started */ + LEDs_SetAllLEDs(LEDS_LED1); + + /* Enable global interrupts so that the USB stack can function */ + GlobalInterruptEnable(); + + while (RunBootloader) + { + CDC_Task(); + USB_USBTask(); + } + + /* Wait a short time to end all USB transactions and then disconnect */ + _delay_us(1000); + + /* 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 the USB and other board hardware drivers */ + USB_Init(); + LEDs_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_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 CDC Notification, Rx and Tx Endpoints */ + Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, + CDC_NOTIFICATION_EPSIZE, 1); + + Endpoint_ConfigureEndpoint(CDC_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1); + + Endpoint_ConfigureEndpoint(CDC_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_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 CDC interface */ + if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) != + (REQTYPE_CLASS | REQREC_INTERFACE)) + { + return; + } + + /* Activity - toggle indicator LEDs */ + LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2); + + /* Process CDC specific control requests */ + switch (USB_ControlRequest.bRequest) + { + case CDC_REQ_GetLineEncoding: + if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + + /* Write the line coding data to the control endpoint */ + Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t)); + Endpoint_ClearOUT(); + } + + break; + case CDC_REQ_SetLineEncoding: + if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + + /* Read the line coding data in from the host into the global struct */ + Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t)); + Endpoint_ClearIN(); + } + + break; + case CDC_REQ_SetControlLineState: + if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + Endpoint_ClearStatusStage(); + } + + break; + } +} + +#if !defined(NO_BLOCK_SUPPORT) +/** Reads or writes a block of EEPROM or FLASH memory to or from the appropriate CDC data endpoint, depending + * on the AVR109 protocol command issued. + * + * \param[in] Command Single character AVR109 protocol command indicating what memory operation to perform + */ +static void ReadWriteMemoryBlock(const uint8_t Command) +{ + uint16_t BlockSize; + char MemoryType; + + uint8_t HighByte = 0; + uint8_t LowByte = 0; + + BlockSize = (FetchNextCommandByte() << 8); + BlockSize |= FetchNextCommandByte(); + + MemoryType = FetchNextCommandByte(); + + if ((MemoryType != MEMORY_TYPE_FLASH) && (MemoryType != MEMORY_TYPE_EEPROM)) + { + /* Send error byte back to the host */ + WriteNextResponseByte('?'); + + return; + } + + /* Check if command is to read a memory block */ + if (Command == AVR109_COMMAND_BlockRead) + { + /* Re-enable RWW section */ + boot_rww_enable(); + + while (BlockSize--) + { + if (MemoryType == MEMORY_TYPE_FLASH) + { + /* Read the next FLASH byte from the current FLASH page */ + #if (FLASHEND > 0xFFFF) + WriteNextResponseByte(pgm_read_byte_far(CurrAddress | HighByte)); + #else + WriteNextResponseByte(pgm_read_byte(CurrAddress | HighByte)); + #endif + + /* If both bytes in current word have been read, increment the address counter */ + if (HighByte) + CurrAddress += 2; + + HighByte = !HighByte; + } + else + { + /* Read the next EEPROM byte into the endpoint */ + WriteNextResponseByte(eeprom_read_byte((uint8_t*)(intptr_t)(CurrAddress >> 1))); + + /* Increment the address counter after use */ + CurrAddress += 2; + } + } + } + else + { + uint32_t PageStartAddress = CurrAddress; + + if (MemoryType == MEMORY_TYPE_FLASH) + { + boot_page_erase(PageStartAddress); + boot_spm_busy_wait(); + } + + while (BlockSize--) + { + if (MemoryType == MEMORY_TYPE_FLASH) + { + /* If both bytes in current word have been written, increment the address counter */ + if (HighByte) + { + /* Write the next FLASH word to the current FLASH page */ + boot_page_fill(CurrAddress, ((FetchNextCommandByte() << 8) | LowByte)); + + /* Increment the address counter after use */ + CurrAddress += 2; + } + else + { + LowByte = FetchNextCommandByte(); + } + + HighByte = !HighByte; + } + else + { + /* Write the next EEPROM byte from the endpoint */ + eeprom_update_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte()); + + /* Increment the address counter after use */ + CurrAddress += 2; + } + } + + /* If in FLASH programming mode, commit the page after writing */ + if (MemoryType == MEMORY_TYPE_FLASH) + { + /* Commit the flash page to memory */ + boot_page_write(PageStartAddress); + + /* Wait until write operation has completed */ + boot_spm_busy_wait(); + } + + /* Send response byte back to the host */ + WriteNextResponseByte('\r'); + } +} +#endif + +/** Retrieves the next byte from the host in the CDC data OUT endpoint, and clears the endpoint bank if needed + * to allow reception of the next data packet from the host. + * + * \return Next received byte from the host in the CDC data OUT endpoint + */ +static uint8_t FetchNextCommandByte(void) +{ + /* Select the OUT endpoint so that the next data byte can be read */ + Endpoint_SelectEndpoint(CDC_RX_EPADDR); + + /* If OUT endpoint empty, clear it and wait for the next packet from the host */ + while (!(Endpoint_IsReadWriteAllowed())) + { + Endpoint_ClearOUT(); + + while (!(Endpoint_IsOUTReceived())) + { + if (USB_DeviceState == DEVICE_STATE_Unattached) + return 0; + } + } + + /* Fetch the next byte from the OUT endpoint */ + return Endpoint_Read_8(); +} + +/** Writes the next response byte to the CDC data IN endpoint, and sends the endpoint back if needed to free up the + * bank when full ready for the next byte in the packet to the host. + * + * \param[in] Response Next response byte to send to the host + */ +static void WriteNextResponseByte(const uint8_t Response) +{ + /* Select the IN endpoint so that the next data byte can be written */ + Endpoint_SelectEndpoint(CDC_TX_EPADDR); + + /* If IN endpoint full, clear it and wait until ready for the next packet to the host */ + if (!(Endpoint_IsReadWriteAllowed())) + { + Endpoint_ClearIN(); + + while (!(Endpoint_IsINReady())) + { + if (USB_DeviceState == DEVICE_STATE_Unattached) + return; + } + } + + /* Write the next byte to the IN endpoint */ + Endpoint_Write_8(Response); +} + +/** Task to read in AVR109 commands from the CDC data OUT endpoint, process them, perform the required actions + * and send the appropriate response back to the host. + */ +static void CDC_Task(void) +{ + /* Select the OUT endpoint */ + Endpoint_SelectEndpoint(CDC_RX_EPADDR); + + /* Check if endpoint has a command in it sent from the host */ + if (!(Endpoint_IsOUTReceived())) + return; + + /* Read in the bootloader command (first byte sent from host) */ + uint8_t Command = FetchNextCommandByte(); + + if (Command == AVR109_COMMAND_ExitBootloader) + { + RunBootloader = false; + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if ((Command == AVR109_COMMAND_SetLED) || (Command == AVR109_COMMAND_ClearLED) || + (Command == AVR109_COMMAND_SelectDeviceType)) + { + FetchNextCommandByte(); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if ((Command == AVR109_COMMAND_EnterProgrammingMode) || (Command == AVR109_COMMAND_LeaveProgrammingMode)) + { + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_ReadPartCode) + { + /* Return ATMEGA128 part code - this is only to allow AVRProg to use the bootloader */ + WriteNextResponseByte(0x44); + WriteNextResponseByte(0x00); + } + else if (Command == AVR109_COMMAND_ReadAutoAddressIncrement) + { + /* Indicate auto-address increment is supported */ + WriteNextResponseByte('Y'); + } + else if (Command == AVR109_COMMAND_SetCurrentAddress) + { + /* Set the current address to that given by the host (translate 16-bit word address to byte address) */ + CurrAddress = (FetchNextCommandByte() << 9); + CurrAddress |= (FetchNextCommandByte() << 1); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_ReadBootloaderInterface) + { + /* Indicate serial programmer back to the host */ + WriteNextResponseByte('S'); + } + else if (Command == AVR109_COMMAND_ReadBootloaderIdentifier) + { + /* Write the 7-byte software identifier to the endpoint */ + for (uint8_t CurrByte = 0; CurrByte < 7; CurrByte++) + WriteNextResponseByte(SOFTWARE_IDENTIFIER[CurrByte]); + } + else if (Command == AVR109_COMMAND_ReadBootloaderSWVersion) + { + WriteNextResponseByte('0' + BOOTLOADER_VERSION_MAJOR); + WriteNextResponseByte('0' + BOOTLOADER_VERSION_MINOR); + } + else if (Command == AVR109_COMMAND_ReadSignature) + { + WriteNextResponseByte(AVR_SIGNATURE_3); + WriteNextResponseByte(AVR_SIGNATURE_2); + WriteNextResponseByte(AVR_SIGNATURE_1); + } + else if (Command == AVR109_COMMAND_EraseFLASH) + { + /* Clear the application section of flash */ + for (uint32_t CurrFlashAddress = 0; CurrFlashAddress < (uint32_t)BOOT_START_ADDR; CurrFlashAddress += SPM_PAGESIZE) + { + boot_page_erase(CurrFlashAddress); + boot_spm_busy_wait(); + boot_page_write(CurrFlashAddress); + boot_spm_busy_wait(); + } + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + #if !defined(NO_LOCK_BYTE_WRITE_SUPPORT) + else if (Command == AVR109_COMMAND_WriteLockbits) + { + /* Set the lock bits to those given by the host */ + boot_lock_bits_set(FetchNextCommandByte()); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + #endif + else if (Command == AVR109_COMMAND_ReadLockbits) + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS)); + } + else if (Command == AVR109_COMMAND_ReadLowFuses) + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS)); + } + else if (Command == AVR109_COMMAND_ReadHighFuses) + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS)); + } + else if (Command == AVR109_COMMAND_ReadExtendedFuses) + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS)); + } + #if !defined(NO_BLOCK_SUPPORT) + else if (Command == AVR109_COMMAND_GetBlockWriteSupport) + { + WriteNextResponseByte('Y'); + + /* Send block size to the host */ + WriteNextResponseByte(SPM_PAGESIZE >> 8); + WriteNextResponseByte(SPM_PAGESIZE & 0xFF); + } + else if ((Command == AVR109_COMMAND_BlockWrite) || (Command == AVR109_COMMAND_BlockRead)) + { + /* Delegate the block write/read to a separate function for clarity */ + ReadWriteMemoryBlock(Command); + } + #endif + #if !defined(NO_FLASH_BYTE_SUPPORT) + else if (Command == AVR109_COMMAND_FillFlashPageWordHigh) + { + /* Write the high byte to the current flash page */ + boot_page_fill(CurrAddress, FetchNextCommandByte()); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_FillFlashPageWordLow) + { + /* Write the low byte to the current flash page */ + boot_page_fill(CurrAddress | 0x01, FetchNextCommandByte()); + + /* Increment the address */ + CurrAddress += 2; + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_WriteFlashPage) + { + /* Commit the flash page to memory */ + boot_page_write(CurrAddress); + + /* Wait until write operation has completed */ + boot_spm_busy_wait(); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_ReadFLASHWord) + { + #if (FLASHEND > 0xFFFF) + uint16_t ProgramWord = pgm_read_word_far(CurrAddress); + #else + uint16_t ProgramWord = pgm_read_word(CurrAddress); + #endif + + WriteNextResponseByte(ProgramWord >> 8); + WriteNextResponseByte(ProgramWord & 0xFF); + } + #endif + #if !defined(NO_EEPROM_BYTE_SUPPORT) + else if (Command == AVR109_COMMAND_WriteEEPROM) + { + /* Read the byte from the endpoint and write it to the EEPROM */ + eeprom_update_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte()); + + /* Increment the address after use */ + CurrAddress += 2; + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == AVR109_COMMAND_ReadEEPROM) + { + /* Read the EEPROM byte and write it to the endpoint */ + WriteNextResponseByte(eeprom_read_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)))); + + /* Increment the address after use */ + CurrAddress += 2; + } + #endif + else if (Command != AVR109_COMMAND_Sync) + { + /* Unknown (non-sync) command, return fail code */ + WriteNextResponseByte('?'); + } + + /* Select the IN endpoint */ + Endpoint_SelectEndpoint(CDC_TX_EPADDR); + + /* Remember if the endpoint is completely full before clearing it */ + bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed()); + + /* Send the endpoint data to the host */ + Endpoint_ClearIN(); + + /* If a full endpoint's worth of data was sent, we need to send an empty packet afterwards to signal end of transfer */ + if (IsEndpointFull) + { + while (!(Endpoint_IsINReady())) + { + if (USB_DeviceState == DEVICE_STATE_Unattached) + return; + } + + Endpoint_ClearIN(); + } + + /* Wait until the data has been sent to the host */ + while (!(Endpoint_IsINReady())) + { + if (USB_DeviceState == DEVICE_STATE_Unattached) + return; + } + + /* Select the OUT endpoint */ + Endpoint_SelectEndpoint(CDC_RX_EPADDR); + + /* Acknowledge the command from the host */ + Endpoint_ClearOUT(); +} |