Olaf Rempel
9f3781a3eb
- 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.
104 lines
2.6 KiB
Makefile
104 lines
2.6 KiB
Makefile
CC := avr-gcc
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LD := avr-ld
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OBJCOPY := avr-objcopy
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OBJDUMP := avr-objdump
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SIZE := avr-size
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TARGET = twiboot
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SOURCE = $(wildcard *.c)
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# select MCU
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MCU = attiny85
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AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ttyUSB0
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#AVRDUDE_PROG := -c dragon_isp -P usb
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# ---------------------------------------------------------------------------
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ifeq ($(MCU), atmega8)
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# atmega8:
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# Fuse L: 0x84 (8Mhz internal RC-Osz., 2.7V BOD)
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# Fuse H: 0xda (512 words bootloader)
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AVRDUDE_MCU=m8
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AVRDUDE_FUSES=lfuse:w:0x84:m hfuse:w:0xda:m
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BOOTLOADER_START=0x1C00
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endif
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ifeq ($(MCU), atmega88)
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# atmega88:
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# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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# Fuse H: 0xdd (2.7V BOD)
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# Fuse E: 0xfa (512 words bootloader)
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AVRDUDE_MCU=m88
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AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m
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BOOTLOADER_START=0x1C00
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endif
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ifeq ($(MCU), atmega168)
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# atmega168:
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# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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# Fuse H: 0xdd (2.7V BOD)
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# Fuse E: 0xfa (512 words bootloader)
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AVRDUDE_MCU=m168 -F
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AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdd:m efuse:w:0xfa:m
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BOOTLOADER_START=0x3C00
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endif
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ifeq ($(MCU), atmega328p)
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# atmega328p:
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# Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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# Fuse H: 0xdc (512 words bootloader)
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# Fuse E: 0xfd (2.7V BOD)
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AVRDUDE_MCU=m328p -F
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AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdc:m efuse:w:0xfd:m
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BOOTLOADER_START=0x7C00
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endif
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ifeq ($(MCU), attiny85)
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# attiny85:
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# Fuse L: 0xe2 (8Mhz internal RC-Osz.)
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# Fuse H: 0xdd (2.7V BOD)
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# Fuse E: 0xfe (self programming enable)
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AVRDUDE_MCU=t85
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AVRDUDE_FUSES=lfuse:w:0xe2:m hfuse:w:0xdd:m efuse:w:0xfe:m
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BOOTLOADER_START=0x1C00
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CFLAGS_TARGET=-DUSE_CLOCKSTRETCH=1
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endif
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# ---------------------------------------------------------------------------
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CFLAGS = -pipe -g -Os -mmcu=$(MCU) -Wall -fdata-sections -ffunction-sections
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CFLAGS += -Wa,-adhlns=$(*F).lst -DBOOTLOADER_START=$(BOOTLOADER_START) $(CFLAGS_TARGET)
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LDFLAGS = -Wl,-Map,$(@:.elf=.map),--cref,--relax,--gc-sections,--section-start=.text=$(BOOTLOADER_START)
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LDFLAGS += -nostartfiles
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# ---------------------------------------------------------------------------
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$(TARGET): $(TARGET).elf
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@$(SIZE) -B -x --mcu=$(MCU) $<
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$(TARGET).elf: $(SOURCE:.c=.o)
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@echo " Linking file: $@"
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@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
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@$(OBJDUMP) -h -S $@ > $(@:.elf=.lss)
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@$(OBJCOPY) -j .text -j .data -O ihex $@ $(@:.elf=.hex)
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@$(OBJCOPY) -j .text -j .data -O binary $@ $(@:.elf=.bin)
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%.o: %.c $(MAKEFILE_LIST)
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@echo " Building file: $<"
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@$(CC) $(CFLAGS) -o $@ -c $<
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clean:
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rm -rf $(SOURCE:.c=.o) $(SOURCE:.c=.lst) $(addprefix $(TARGET), .elf .map .lss .hex .bin)
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install: $(TARGET).elf
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avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) -U flash:w:$(<:.elf=.hex)
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fuses:
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avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) $(patsubst %,-U %, $(AVRDUDE_FUSES))
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