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rpi zero openocd SWD config
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| interface bcm2835gpio | |
| # hexdump -s4 -n4 -e '\"0x\" 4/1 \"%02X\"\"\\n\"\" \"' /proc/device-tree/soc/ranges | |
| bcm2835gpio_peripheral_base 0x20000000 | |
| # Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET | |
| # These depend on system clock, calibrated for stock 700MHz | |
| # bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET | |
| bcm2835gpio_speed_coeffs 146203 36 | |
| # bcm2835gpio_swd_nums SWDCLK SWDIO | |
| bcm2835gpio_swd_nums 25 24 | |
| # bcm2835gpio_srst_num RST | |
| bcm2835gpio_srst_num 18 |
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