twiboot/Makefile

CC	:= avr-gcc
LD	:= avr-ld
OBJCOPY	:= avr-objcopy
OBJDUMP	:= avr-objdump
SIZE	:= avr-size

TARGET = twiboot
SOURCE = $(wildcard *.c)

# select MCU
MCU = attiny85

AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ttyUSB0
#AVRDUDE_PROG := -c dragon_isp -P usb

# ---------------------------------------------------------------------------

ifeq ($(MCU), atmega8)
# atmega8:
# Fuse L: 0x84 (8Mhz internal RC-Osz., 2.7V BOD)
# Fuse H: 0xda (512 words bootloader)
AVRDUDE_MCU=m8
AVRDUDE_FUSES=lfuse:w:0x84:m hfuse:w:0xda:m

BOOTLOADER_START=0x1C00
endif

ifeq ($(MCU), atmega88)
# atmega88:
# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
# Fuse H: 0xdd (2.7V BOD)
# Fuse E: 0xfa (512 words bootloader)
AVRDUDE_MCU=m88
AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m

BOOTLOADER_START=0x1C00
endif

ifeq ($(MCU), atmega168)
# atmega168:
# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
# Fuse H: 0xdd (2.7V BOD)
# Fuse E: 0xfa (512 words bootloader)
AVRDUDE_MCU=m168 -F
AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m

BOOTLOADER_START=0x3C00
endif

ifeq ($(MCU), atmega328p)
# atmega328p:
# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
# Fuse H: 0xdc (512 words bootloader)
# Fuse E: 0xfd (2.7V BOD)
AVRDUDE_MCU=m328p -F
AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdc:m efuse:w:0xfd:m

BOOTLOADER_START=0x7C00
endif

ifeq ($(MCU), attiny85)
# attiny85:
# Fuse L: 0xe2 (8Mhz internal RC-Osz.)
# Fuse H: 0xdd (2.7V BOD)
# Fuse E: 0xfe (self programming enable)
AVRDUDE_MCU=t85
AVRDUDE_FUSES=lfuse:w:0xe2:m hfuse:w:0xdd:m efuse:w:0xfe:m

BOOTLOADER_START=0x1C00
CFLAGS_TARGET=-DUSE_CLOCKSTRETCH=1 -DVIRTUAL_BOOT_SECTION=1
endif

# ---------------------------------------------------------------------------

CFLAGS = -pipe -g -Os -mmcu=$(MCU) -Wall -fdata-sections -ffunction-sections
CFLAGS += -Wa,-adhlns=$(*F).lst -DBOOTLOADER_START=$(BOOTLOADER_START) $(CFLAGS_TARGET)
LDFLAGS = -Wl,-Map,$(@:.elf=.map),--cref,--relax,--gc-sections,--section-start=.text=$(BOOTLOADER_START)
LDFLAGS += -nostartfiles

# ---------------------------------------------------------------------------

$(TARGET): $(TARGET).elf
	@$(SIZE) -B -x --mcu=$(MCU) $<

$(TARGET).elf: $(SOURCE:.c=.o)
	@echo " Linking file:  $@"
	@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
	@$(OBJDUMP) -h -S $@ > $(@:.elf=.lss)
	@$(OBJCOPY) -j .text -j .data -O ihex $@ $(@:.elf=.hex)
	@$(OBJCOPY) -j .text -j .data -O binary $@ $(@:.elf=.bin)

%.o: %.c $(MAKEFILE_LIST)
	@echo " Building file: $<"
	@$(CC) $(CFLAGS) -o $@ -c $<

clean:
	rm -rf $(SOURCE:.c=.o) $(SOURCE:.c=.lst) $(addprefix $(TARGET), .elf .map .lss .hex .bin)

install: $(TARGET).elf
	avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) -U flash:w:$(<:.elf=.hex)

fuses:
	avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) $(patsubst %,-U %, $(AVRDUDE_FUSES))
update Makefile 2014-10-05 14:32:07 +02:00			`CC := avr-gcc`
			`LD := avr-ld`
			`OBJCOPY := avr-objcopy`
			`OBJDUMP := avr-objdump`
			`SIZE := avr-size`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`TARGET = twiboot`
			`SOURCE = $(wildcard *.c)`

			`# select MCU`
Implement USI peripheral slave statemachine - Implement a TWI slave using the USI peripheral found in AVR tiny MCUs - using attiny85 as target (has no bootloader section!) - USI peripheral in general needs clock stretching support from the master since the whole statemachine is software based. For now the actual writing to flash/eeprom is also done during clock stretching (like original twiboot implementation). This might be changed later. - ACK/NAK handling is different: For TWI peripheral the ACK/NAK of the next byte has to be returned by TWI_data_write(). For USI peripheral the ACK/NAK of the current byte needs to be returned. For now the TWI version remains in the code and might be changed later. 2020-10-26 13:51:07 +01:00			`MCU = attiny85`
update Makefile 2014-10-05 14:32:07 +02:00
			`AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ttyUSB0`
			`#AVRDUDE_PROG := -c dragon_isp -P usb`

			`# ---------------------------------------------------------------------------`

			`ifeq ($(MCU), atmega8)`
Update code style Update indention to spaces Fix comments Add README.md and GPL-2 LICENSE files 2019-11-06 10:03:47 +01:00			`# atmega8:`
			`# Fuse L: 0x84 (8Mhz internal RC-Osz., 2.7V BOD)`
			`# Fuse H: 0xda (512 words bootloader)`
multicpu support 2010-08-15 16:44:54 +02:00			`AVRDUDE_MCU=m8`
update Makefile 2014-10-05 14:32:07 +02:00			`AVRDUDE_FUSES=lfuse:w:0x84:m hfuse:w:0xda:m`

multicpu support 2010-08-15 16:44:54 +02:00			`BOOTLOADER_START=0x1C00`
update Makefile 2014-10-05 14:32:07 +02:00			`endif`

			`ifeq ($(MCU), atmega88)`
Update code style Update indention to spaces Fix comments Add README.md and GPL-2 LICENSE files 2019-11-06 10:03:47 +01:00			`# atmega88:`
			`# Fuse L: 0xc2 (8Mhz internal RC-Osz.)`
			`# Fuse H: 0xdd (2.7V BOD)`
			`# Fuse E: 0xfa (512 words bootloader)`
multicpu support 2010-08-15 16:44:54 +02:00			`AVRDUDE_MCU=m88`
update Makefile 2014-10-05 14:32:07 +02:00			`AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m`

			`BOOTLOADER_START=0x1C00`
multicpu support 2010-08-15 16:44:54 +02:00			`endif`
update Makefile 2014-10-05 14:32:07 +02:00
			`ifeq ($(MCU), atmega168)`
Update code style Update indention to spaces Fix comments Add README.md and GPL-2 LICENSE files 2019-11-06 10:03:47 +01:00			`# atmega168:`
			`# Fuse L: 0xc2 (8Mhz internal RC-Osz.)`
			`# Fuse H: 0xdd (2.7V BOD)`
			`# Fuse E: 0xfa (512 words bootloader)`
update Makefile 2014-10-05 14:32:07 +02:00			`AVRDUDE_MCU=m168 -F`
			`AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m`

multicpu support 2010-08-15 16:44:54 +02:00			`BOOTLOADER_START=0x3C00`
			`endif`

add support for atmega328p 2015-03-18 23:28:12 +01:00			`ifeq ($(MCU), atmega328p)`
Update code style Update indention to spaces Fix comments Add README.md and GPL-2 LICENSE files 2019-11-06 10:03:47 +01:00			`# atmega328p:`
			`# Fuse L: 0xc2 (8Mhz internal RC-Osz.)`
			`# Fuse H: 0xdc (512 words bootloader)`
			`# Fuse E: 0xfd (2.7V BOD)`
add support for atmega328p 2015-03-18 23:28:12 +01:00			`AVRDUDE_MCU=m328p -F`
Fix sizeof(VERSION_STRING) - sizeof(info) should not be increased (16->18) since the size is never exchanged with the I2C master. Also using a non 2^x size will result in bigger code since the compiler can no longer use a simple AND to implement the bcnt %= sizeof(info). - when using a info[16] the firmware is small enough to fit in a 512 word bootloader again :) 2015-03-21 09:15:43 +01:00			`AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdc:m efuse:w:0xfd:m`
add support for atmega328p 2015-03-18 23:28:12 +01:00
Fix sizeof(VERSION_STRING) - sizeof(info) should not be increased (16->18) since the size is never exchanged with the I2C master. Also using a non 2^x size will result in bigger code since the compiler can no longer use a simple AND to implement the bcnt %= sizeof(info). - when using a info[16] the firmware is small enough to fit in a 512 word bootloader again :) 2015-03-21 09:15:43 +01:00			`BOOTLOADER_START=0x7C00`
add support for atmega328p 2015-03-18 23:28:12 +01:00			`endif`

Implement USI peripheral slave statemachine - Implement a TWI slave using the USI peripheral found in AVR tiny MCUs - using attiny85 as target (has no bootloader section!) - USI peripheral in general needs clock stretching support from the master since the whole statemachine is software based. For now the actual writing to flash/eeprom is also done during clock stretching (like original twiboot implementation). This might be changed later. - ACK/NAK handling is different: For TWI peripheral the ACK/NAK of the next byte has to be returned by TWI_data_write(). For USI peripheral the ACK/NAK of the current byte needs to be returned. For now the TWI version remains in the code and might be changed later. 2020-10-26 13:51:07 +01:00			`ifeq ($(MCU), attiny85)`
			`# attiny85:`
			`# Fuse L: 0xe2 (8Mhz internal RC-Osz.)`
			`# Fuse H: 0xdd (2.7V BOD)`
			`# Fuse E: 0xfe (self programming enable)`
			`AVRDUDE_MCU=t85`
			`AVRDUDE_FUSES=lfuse:w:0xe2:m hfuse:w:0xdd:m efuse:w:0xfe:m`

			`BOOTLOADER_START=0x1C00`
Implement a virtual bootloader section - patch reset vector while programming flash page0 Let the reset vector always point to the twiboot start. - Use another (must be unused!) ISR vector to store the original reset vector as jump to the application. - Cache the values for the verification read - currently works only for devices < 8kB flash (2 byte vector entries) - using a attiny85 as target This change is heavily based on the optiboot bootloader. 2020-10-26 18:54:00 +01:00			`CFLAGS_TARGET=-DUSE_CLOCKSTRETCH=1 -DVIRTUAL_BOOT_SECTION=1`
Implement USI peripheral slave statemachine - Implement a TWI slave using the USI peripheral found in AVR tiny MCUs - using attiny85 as target (has no bootloader section!) - USI peripheral in general needs clock stretching support from the master since the whole statemachine is software based. For now the actual writing to flash/eeprom is also done during clock stretching (like original twiboot implementation). This might be changed later. - ACK/NAK handling is different: For TWI peripheral the ACK/NAK of the next byte has to be returned by TWI_data_write(). For USI peripheral the ACK/NAK of the current byte needs to be returned. For now the TWI version remains in the code and might be changed later. 2020-10-26 13:51:07 +01:00			`endif`

update Makefile 2014-10-05 14:32:07 +02:00			`# ---------------------------------------------------------------------------`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`CFLAGS = -pipe -g -Os -mmcu=$(MCU) -Wall -fdata-sections -ffunction-sections`
Implement USI peripheral slave statemachine - Implement a TWI slave using the USI peripheral found in AVR tiny MCUs - using attiny85 as target (has no bootloader section!) - USI peripheral in general needs clock stretching support from the master since the whole statemachine is software based. For now the actual writing to flash/eeprom is also done during clock stretching (like original twiboot implementation). This might be changed later. - ACK/NAK handling is different: For TWI peripheral the ACK/NAK of the next byte has to be returned by TWI_data_write(). For USI peripheral the ACK/NAK of the current byte needs to be returned. For now the TWI version remains in the code and might be changed later. 2020-10-26 13:51:07 +01:00			`CFLAGS += -Wa,-adhlns=$(*F).lst -DBOOTLOADER_START=$(BOOTLOADER_START) $(CFLAGS_TARGET)`
update Makefile 2014-10-05 14:32:07 +02:00			`LDFLAGS = -Wl,-Map,$(@:.elf=.map),--cref,--relax,--gc-sections,--section-start=.text=$(BOOTLOADER_START)`
Do not use IRQs and remove vector table Do not use ISRs and poll for interrupt flags in the main loop. No need for moving vector table into bootloader and back. Remove vector table by adding LDFLAGS = -nostartfiles. Manually add some code which is now removed, but still needed by C runtime: - make sure that r1 is 0x00 (zero register). - on some MCUs the stack pointer is not initialized correctly after reset. - main() need to be placed in special section .init9 to be called at all. Not sure why the BSS and DATA segment are still initialized. This change is heavily based on the optiboot bootloader. 2019-11-03 18:31:30 +01:00			`LDFLAGS += -nostartfiles`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`# ---------------------------------------------------------------------------`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`$(TARGET): $(TARGET).elf`
			`@$(SIZE) -B -x --mcu=$(MCU) $<`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`$(TARGET).elf: $(SOURCE:.c=.o)`
			`@echo " Linking file: $@"`
			`@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^`
			`@$(OBJDUMP) -h -S $@ > $(@:.elf=.lss)`
			`@$(OBJCOPY) -j .text -j .data -O ihex $@ $(@:.elf=.hex)`
			`@$(OBJCOPY) -j .text -j .data -O binary $@ $(@:.elf=.bin)`
initial commit 2007-09-21 21:39:09 +02:00
multicpu support 2010-08-15 16:44:54 +02:00			`%.o: %.c $(MAKEFILE_LIST)`
update Makefile 2014-10-05 14:32:07 +02:00			`@echo " Building file: $<"`
			`@$(CC) $(CFLAGS) -o $@ -c $<`
multicpu support 2010-08-15 16:44:54 +02:00
initial commit 2007-09-21 21:39:09 +02:00			`clean:`
update Makefile 2014-10-05 14:32:07 +02:00			`rm -rf $(SOURCE:.c=.o) $(SOURCE:.c=.lst) $(addprefix $(TARGET), .elf .map .lss .hex .bin)`
initial commit 2007-09-21 21:39:09 +02:00
update Makefile 2014-10-05 14:32:07 +02:00			`install: $(TARGET).elf`
			`avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) -U flash:w:$(<:.elf=.hex)`
change programmer 2009-01-24 16:52:22 +01:00
update Makefile 2014-10-05 14:32:07 +02:00			`fuses:`
			`avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) $(patsubst %,-U %, $(AVRDUDE_FUSES))`