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# SPDX-License-Identifier: GPL-2.0-or-later
#
# Config for using Raspberry Pi's expansion header
#
# This is best used with a fast enough buffer but also
# is suitable for direct connection if the target voltage
# matches RPi's 3.3V and the cable is short enough.
#
# Do not forget the GND connection, pin 6 of the expansion header.
#
adapter driver bcm2835gpio
bcm2835gpio peripheral_base 0x3F000000
# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
# These depend on system clock, calibrated for scaling_max_freq 900MHz
# bcm2835gpio speed SPEED_COEFF SPEED_OFFSET
bcm2835gpio speed_coeffs 225000 36
# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
# Header pin numbers: 23 22 19 21
adapter gpio tck -chip 0 11
adapter gpio tms -chip 0 25
adapter gpio tdi -chip 0 10
adapter gpio tdo -chip 0 9
# Each of the SWD lines need a gpio number set: swclk swdio
# Header pin numbers: 23 22
adapter gpio swclk -chip 0 11
adapter gpio swdio -chip 0 25
# If you define trst or srst, use appropriate reset_config
# Header pin numbers: TRST - 26, SRST - 18
# adapter gpio trst -chip 0 7
# reset_config trst_only
# adapter gpio srst -chip 0 24
# reset_config srst_only srst_push_pull
# or if you have both connected,
# reset_config trst_and_srst srst_push_pull
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