1 # SPDX-License-Identifier: GPL-2.0-or-later
4 # Config for using Raspberry Pi's expansion header
6 # This is best used with a fast enough buffer but also
7 # is suitable for direct connection if the target voltage
8 # matches RPi's 3.3V and the cable is short enough.
10 # Do not forget the GND connection, pin 6 of the expansion header.
13 adapter driver bcm2835gpio
15 bcm2835gpio peripheral_base 0x3F000000
17 # Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
18 # These depend on system clock, calibrated for stock 700MHz
19 # bcm2835gpio speed SPEED_COEFF SPEED_OFFSET
20 bcm2835gpio speed_coeffs 146203 36
22 # Each of the JTAG lines need a gpio number set: tck tms tdi tdo
23 # Header pin numbers: 23 22 19 21
24 adapter gpio tck -chip 0 11
25 adapter gpio tms -chip 0 25
26 adapter gpio tdi -chip 0 10
27 adapter gpio tdo -chip 0 9
29 # Each of the SWD lines need a gpio number set: swclk swdio
30 # Header pin numbers: 23 22
31 adapter gpio swclk -chip 0 11
32 adapter gpio swdio -chip 0 25
34 # If you define trst or srst, use appropriate reset_config
35 # Header pin numbers: TRST - 26, SRST - 18
37 # adapter gpio trst -chip 0 7
38 # reset_config trst_only
40 # adapter gpio srst -chip 0 24
41 # reset_config srst_only srst_push_pull
43 # or if you have both connected,
44 # reset_config trst_and_srst srst_push_pull