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37 lines
952 B
Makefile
37 lines
952 B
Makefile
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# Raspberry Pi GPIO as debug adapter
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# Numbers are GPIO numbers
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SWCLK_PIN ?= 21
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SWDIO_PIN ?= 20
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SRST_PIN ?= 16
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ifeq (1, $(shell grep ARMv6 /proc/cpuinfo > /dev/null; echo $$?))
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ifeq (0, $(shell grep [[:lower:]]0311[[:digit:]] /proc/cpuinfo > /dev/null; echo $$?))
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# raspi4
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PERIPH_BASE = 0xFE000000
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SPEED_COEFF = 236181
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SPEED_OFFSET = 60
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else
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# raspi2, 3
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PERIPH_BASE = 0x3F000000
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SPEED_COEFF = 146203
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SPEED_OFFSET = 36
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endif
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else
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# raspi1
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PERIPH_BASE = 0x20000000
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SPEED_COEFF = 113714
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SPEED_OFFSET = 28
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endif
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OPENOCD_ADAPTER_INIT ?= \
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-c 'adapter driver bcm2835gpio' \
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-c 'bcm2835gpio_peripheral_base $(PERIPH_BASE)' \
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-c 'bcm2835gpio_speed_coeffs $(SPEED_COEFF) $(SPEED_OFFSET)' \
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-c 'bcm2835gpio_swd_nums $(SWCLK_PIN ) $(SWDIO_PIN)' \
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-c 'bcm2835gpio_srst_num $(SRST_PIN)' \
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-c 'transport select swd'
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# bcm2835gpio needs access to /dev/mem
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export OPENOCD ?= sudo -E openocd
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