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bombasticbobbombasticbob
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made changes to core to support more than 2 serial ports, and to support some
of the (major) differences in the 'E' series and some minor tweeks for 'A'. Also added variant and bootloader for 'cc0 atxmega32e5 breakout' board.
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‎bootloaders/cc0_atxmega_e5/Makefile

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# Makefile for xmega bootloader for ATxmega32e5 processor
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#
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# (some comments from original retained for reference)
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#
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# Makefile for ATmegaBOOT
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# E.Lins, 18.7.2005
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# $Id: Makefile,v 1.4 2008/10/05 17:41:43 cvs Exp $
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#
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# program name should not be changed...
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PROGRAM = xmegaBOOT
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# enter the parameters for the avrdude isp tool
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ISPTOOL = avrispmkii
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ISPPORT = usb
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ISPSPEED =
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# added by me - conf file is 'special' for the xmega
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ISPCONF = ./avrdude.conf
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# TODO: have multiple CPU-based targets that build the 'xmega' target but for a specific CPU
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MCU_TARGET = atxmega32e5
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BUILD_MCU_TARGET = atxmega32e5
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# xmega32 bootloader starts at 8000H
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LDSECTION = --section-start=.text=0x8000
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# fuses are a little different for the xmega. these values are derived from
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# experimentation. They do NOT lock any of the NVRAM sections after flashing
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# xmega fuse assignments
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# see pg 418 in 'E' manual, sect 28.12.1 'External Programming'
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# this gives you the correct addresses for everything for avrdude.conf
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# lockbits - must have BOTH bits 0 and 1 SET or you'll have to chip erase to get them back
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# bit assignments: 11 = NOLOCK, 10 = WLOCK, 01 = RLOCK, 00 = RWLOCK (typically)
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# bit 7:6 bootloader bit 5:4 application bit 3:2 app table bit 1:0 programming interface
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#
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# to ONLY lock the bootloader, set LOCKBITS to 0xBF (bit 6 clear, all others set)
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#LOCKBITS_LOCK=0xFF
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LOCKBITS_LOCK=0xBF
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LOCKBITS_UNLOCK=0xFF
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# 4.13.1
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# FUSEBYTE1 - watchdog timer bits - set to FF for now - see 9.7.1 and 9.7.2
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FUSE1=0xFF
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# 4.13.2
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# FUSEBYTE2 - bit 6 = STARTUP (0 for bootloader, 1 for app address 0000)
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# bit 5 = TOSCSEL (set to 1, always - implies 'shared' when applicable)
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# bits 1:0 = sleep BOD mode/disable 11 to disable, 10 or 01 otherwise (see manual)
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#11111111 = FF (bit 6 set)
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#10111111 = BF (bit 6 clear)
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FUSE2=0xBF
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# 4.13.3
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# FUSEBYTE4 bit 4 = reset disable (0 to disable, 1 = normal)
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# bits 3:2 = startup time delay (00 = 64, 01 = 4, 11 = 0)
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# bit 1 = watchdog timer config lock (0 to lock, 1 = unlocked)
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# all other bits should be 1 (note bit 0 may be read as a 0!)
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FUSE4=0xFF
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# 4.13.4
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# FUSEBYTE5 bits 5:4 = (running) BOD mode/disable 11 to disable, 10 or 01 otherwise (see manual)
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# bit 3 = 'preserve EEPROM during chip erase' - 0 to NOT erase EEPROM, 1 to erase
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# bits 2:0 = BOD level - see table 8-2 - 000 = 1.6, 111 = 3.0 at 0.2v increments
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#FUSE5=0xF8
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#FUSE5=0xF0
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FUSE5=0xEA
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# EA enables undervolts with mode 10 (continuous) and setting at 2.6v
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# TODO: determine if this is the best setting to use
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#FUSEBYTE6 bit 7:6 are 'fault actions' for timers 5 and 4 (1 for default)
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# bits 5:0 are the corresponding value output on fault (inverted)
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FUSE6=0xFF
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#/usr/local/bin/avrdude -C/home/zelgadis/boardformula/avrdude.conf -p${MCU_TARGET} -cavrispmkII -Pusb -e \
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# -Ulockbits:w:${LOCKBITS_UNLOCK}:m -Ufuse1:w:${FUSE1}:m -Ufuse2:w:${FUSE2}:m \
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# -Ufuse4:w:${FUSE4}:m -Ufuse5:w:${FUSE5}:m -Ufuse6:w:${FUSE6}:m
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#/usr/local/bin/avrdude -C/home/zelgadis/boardformula/avrdude.conf -p${MCU_TARGET} -cavrispmkII -Pusb \
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# -Uflash:w:${hex_file}:i -Ulockbits:w:${LOCKBITS_LOCK}:m
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OBJ = $(PROGRAM).o
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#OBJ += sp_driver.o
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OPTIMIZE = -O2
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DEFS =
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LIBS =
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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CFLAGS = -g -Wall $(OPTIMIZE) -mmcu=$(BUILD_MCU_TARGET) -DF_CPU=$(AVR_FREQ) $(DEFS)
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LDFLAGS = -Wl,$(LDSECTION)
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# Override is only needed by avr-lib build system.
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#override LDFLAGS = -Wl,-Map,$(PROGRAM).map,$(LDSECTION)
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TARGET = xmega
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AVR_FREQ = 32000000L
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# this next part should be modified as needed
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# I set the max time count to 1/8 the CPU frequency, 3 flashes on the LED,
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# and flash baud rate fixed at 115200 (just like the Uno, actually)
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CFLAGS += '-DMAX_TIME_COUNT=F_CPU>>3' '-DNUM_LED_FLASHES=3' '-DWATCHDOG_MODS' '-DDOUBLE_SPEED'
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# change this next part for a different baud rate (but why would you?)
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CFLAGS += '-DBAUD_RATE=115200'
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all:
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xmega: $(PROGRAM)_xmega0.hex
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@echo building xmega
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$(PROGRAM)_xmega.hex: $(PROGRAM)_xmega.elf
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$(OBJCOPY) -j .text -j .data -O ihex $< $@
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$(PROGRAM)_xmega.elf: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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#flashall: $(PROGRAM)_xmega_plus_image.hex fusesxmega
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# avrdude -C $(ISPCONF) -c $(ISPTOOL) -p $(MCU_TARGET) -P $(ISPPORT) $(ISPSPEED) \
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# -U flash:w:$(PROGRAM)_xmega_plus_image.hex -U lockbits:w:$(LOCKBITS_LOCK):m
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fixhex: fixhex.c
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gcc -o fixhex fixhex.c
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$(PROGRAM)_xmega0.hex: $(PROGRAM)_xmega.hex fixhex
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./fixhex $(PROGRAM)_xmega.hex $(PROGRAM)_xmega0.hex
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flashboot: xmega fusesxmega
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# in order to flash the boot loader I have to flash it as the "boot" section (no choice)
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# since the hex file begins with an extended address record, if I were to simply TRIM THAT OFF
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# then the atxmega32e5 will flash the bootloader correctly.
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# TODO: write a program to correctly manage this out of a combined file
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avrdude -C $(ISPCONF) -c $(ISPTOOL) -p $(MCU_TARGET) -P $(ISPPORT) $(ISPSPEED) \
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-Uboot:w:$(PROGRAM)_xmega0.hex:i -Ulockbits:w:$(LOCKBITS_LOCK):m
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# this next target programs the fuses and leaves lock bits 'unlocked' for flashing
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# it also performs a chip erase which normally includes the EEPROM as well
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fusesxmega:
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while ! avrdude -C $(ISPCONF) -c $(ISPTOOL) -p $(MCU_TARGET) -P $(ISPPORT) $(ISPSPEED) -e \
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-Ulockbits:w:${LOCKBITS_UNLOCK}:m -Ufuse1:w:${FUSE1}:m -Ufuse2:w:${FUSE2}:m \
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-Ufuse4:w:${FUSE4}:m -Ufuse5:w:${FUSE5}:m -Ufuse6:w:${FUSE6}:m ; do sleep 1 ; done
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erase:
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avrdude -C $(ISPCONF) -c $(ISPTOOL) -p $(MCU_TARGET) -P $(ISPPORT) $(ISPSPEED) -e
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%.elf: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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clean:
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rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex
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%.lst: %.elf
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$(OBJDUMP) -h -S $< > $@
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%.hex: %.elf
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$(OBJCOPY) -j .text -j .data -O ihex $< $@
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%.srec: %.elf
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$(OBJCOPY) -j .text -j .data -O srec $< $@
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%.bin: %.elf
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$(OBJCOPY) -j .text -j .data -O binary $< $@
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‎bootloaders/cc0_atxmega_e5/README

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This is a modification of the Arduino bootloader, which is derived from the
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Adafruit bootloader 'as downloaded' that builds on POSIX-compatible systems
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and uses an AVRISPmkII to program the target.
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make xmega; make flash
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original source:
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http://learn.adafruit.com/arduino-tips-tricks-and-techniques/bootloader
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http://ladyada.net/library/arduino/Adaboot328.zip
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