riscv-openocd/tcl/interface/raspberrypi-gpio-connector.cfg

# SPDX-License-Identifier: GPL-2.0-or-later

#
# Config for Raspberry Pi GPIO 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, e.g. pin 20 of the GPIO header.
#

if { [info exists GPIO_CHIP] } {
    set _GPIO_CHIP $GPIO_CHIP
} else {
    set _GPIO_CHIP 0
}

# GPIO 25 (pin 22) previously used for TMS/SWDIO is pulled-down by default.
# The JTAG/SWD specification requires pull-up at the target board
# for either signal. Connecting the signal pulled-up on the target
# to the pull-down on the adapter is not a good idea.
# GPIO 8 is pulled-up by default.
echo "Warn : TMS/SWDIO moved to GPIO 8 (pin 24). Check the wiring please!"

# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
# Header pin numbers: 23 24 19 21
adapter gpio tck -chip $_GPIO_CHIP 11
adapter gpio tms -chip $_GPIO_CHIP 8
adapter gpio tdi -chip $_GPIO_CHIP 10
adapter gpio tdo -chip $_GPIO_CHIP 9

# Each of the SWD lines need a gpio number set: swclk swdio
# Header pin numbers: 23 24
adapter gpio swclk -chip $_GPIO_CHIP 11
adapter gpio swdio -chip $_GPIO_CHIP 8

# If you define trst or srst, use appropriate reset_config
# Header pin numbers: TRST - 26, SRST - 18

# adapter gpio trst -chip $_GPIO_CHIP 7
# reset_config trst_only

# adapter gpio srst -chip $_GPIO_CHIP 24
# reset_config srst_only srst_push_pull

# or if you have both connected,
# reset_config trst_and_srst srst_push_pull