From 237ea87c4fcb4865863fc15e07e179323caa7881 Mon Sep 17 00:00:00 2001 From: Håvard Espeland Date: Sat, 5 Feb 2011 19:26:39 +0100 Subject: Fork of LUFA CDC Bootloader Initial commit --- BootloaderCDC.c | 571 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 571 insertions(+) create mode 100644 BootloaderCDC.c (limited to 'BootloaderCDC.c') diff --git a/BootloaderCDC.c b/BootloaderCDC.c new file mode 100644 index 0000000..6f629d5 --- /dev/null +++ b/BootloaderCDC.c @@ -0,0 +1,571 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2010. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2010 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 disclaim 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. + */ +CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0, + .CharFormat = OneStopBit, + .ParityType = 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.) + */ +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. + */ +bool RunBootloader = true; + + +/** 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) +{ + /* Check if we should run the bootloader. */ + DDRD &= ~(1 << PD3); + RunBootloader = !(PIND & (1 << PD3)); + + if (!RunBootloader) + { + cli(); + __asm("jmp 0x0000"); + } + + /* Setup hardware required for the bootloader */ + SetupHardware(); + + /* Enable global interrupts so that the USB stack can function */ + sei(); + + while (RunBootloader) + { + CDC_Task(); + USB_USBTask(); + } + + /* Disconnect from the host - USB interface will be reset later along with the AVR */ + USB_Detach(); + + /* Enable the watchdog and force a timeout to reset the AVR */ + wdt_enable(WDTO_250MS); + + for (;;); +} + +/** Configures all hardware required for the bootloader. */ +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 CDC Notification, Rx and Tx Endpoints */ + Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT, + ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE, + ENDPOINT_BANK_SINGLE); + + Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK, + ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE, + ENDPOINT_BANK_SINGLE); + + Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK, + ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE, + ENDPOINT_BANK_SINGLE); +} + +/** 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) +{ + /* Process CDC specific control requests */ + switch (USB_ControlRequest.bRequest) + { + case 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_Line_Coding_t)); + Endpoint_ClearOUT(); + } + + break; + case 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_Line_Coding_t)); + Endpoint_ClearIN(); + } + + 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 AVR910 protocol command issued. + * + * \param[in] Command Single character AVR910 protocol command indicating what memory operation to perform + */ +static void ReadWriteMemoryBlock(const uint8_t Command) +{ + uint16_t BlockSize; + char MemoryType; + + bool HighByte = false; + uint8_t LowByte = 0; + + BlockSize = (FetchNextCommandByte() << 8); + BlockSize |= FetchNextCommandByte(); + + MemoryType = FetchNextCommandByte(); + + if ((MemoryType != 'E') && (MemoryType != 'F')) + { + /* Send error byte back to the host */ + WriteNextResponseByte('?'); + + return; + } + + /* Check if command is to read memory */ + if (Command == 'g') + { + /* Re-enable RWW section */ + boot_rww_enable(); + + while (BlockSize--) + { + if (MemoryType == 'F') + { + /* 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 == 'F') + { + boot_page_erase(PageStartAddress); + boot_spm_busy_wait(); + } + + while (BlockSize--) + { + if (MemoryType == 'F') + { + /* 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_write_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 == 'F') + { + /* 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_EPNUM); + + /* 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_Byte(); +} + +/** 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_EPNUM); + + /* 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 OUT endpoint */ + Endpoint_Write_Byte(Response); +} + +/** Task to read in AVR910 commands from the CDC data OUT endpoint, process them, perform the required actions + * and send the appropriate response back to the host. + */ +void CDC_Task(void) +{ + /* Select the OUT endpoint */ + Endpoint_SelectEndpoint(CDC_RX_EPNUM); + + /* 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 == 'E') + { + RunBootloader = false; + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == 'T') + { + FetchNextCommandByte(); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if ((Command == 'L') || (Command == 'P')) + { + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == 't') + { + /* Return ATMEGA128 part code - this is only to allow AVRProg to use the bootloader */ + WriteNextResponseByte(0x44); + WriteNextResponseByte(0x00); + } + else if (Command == 'a') + { + /* Indicate auto-address increment is supported */ + WriteNextResponseByte('Y'); + } + else if (Command == 'A') + { + /* Set the current address to that given by the host */ + CurrAddress = (FetchNextCommandByte() << 9); + CurrAddress |= (FetchNextCommandByte() << 1); + + /* Send confirmation byte back to the host */ + WriteNextResponseByte('\r'); + } + else if (Command == 'p') + { + /* Indicate serial programmer back to the host */ + WriteNextResponseByte('S'); + } + else if (Command == 'S') + { + /* Write the 7-byte software identifier to the endpoint */ + for (uint8_t CurrByte = 0; CurrByte < 7; CurrByte++) + WriteNextResponseByte(SOFTWARE_IDENTIFIER[CurrByte]); + } + else if (Command == 'V') + { + WriteNextResponseByte('0' + BOOTLOADER_VERSION_MAJOR); + WriteNextResponseByte('0' + BOOTLOADER_VERSION_MINOR); + } + else if (Command == 's') + { + WriteNextResponseByte(AVR_SIGNATURE_3); + WriteNextResponseByte(AVR_SIGNATURE_2); + WriteNextResponseByte(AVR_SIGNATURE_1); + } + else if (Command == 'e') + { + /* Clear the application section of flash */ + for (uint32_t CurrFlashAddress = 0; CurrFlashAddress < 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 == 'l') + { + /* 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 == 'r') + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS)); + } + else if (Command == 'F') + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS)); + } + else if (Command == 'N') + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS)); + } + else if (Command == 'Q') + { + WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS)); + } + #if !defined(NO_BLOCK_SUPPORT) + else if (Command == 'b') + { + WriteNextResponseByte('Y'); + + /* Send block size to the host */ + WriteNextResponseByte(SPM_PAGESIZE >> 8); + WriteNextResponseByte(SPM_PAGESIZE & 0xFF); + } + else if ((Command == 'B') || (Command == 'g')) + { + /* Delegate the block write/read to a separate function for clarity */ + ReadWriteMemoryBlock(Command); + } + #endif + #if !defined(NO_FLASH_BYTE_SUPPORT) + else if (Command == 'C') + { + /* 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 == 'c') + { + /* 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 == 'm') + { + /* 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 == 'R') + { + #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 == 'D') + { + /* Read the byte from the endpoint and write it to the EEPROM */ + eeprom_write_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 == 'd') + { + /* 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 != 27) + { + /* Unknown (non-sync) command, return fail code */ + WriteNextResponseByte('?'); + } + + /* Select the IN endpoint */ + Endpoint_SelectEndpoint(CDC_TX_EPNUM); + + /* 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_EPNUM); + + /* Acknowledge the command from the host */ + Endpoint_ClearOUT(); +} + -- cgit v1.2.3