zc swd wire harness

diff --git a/rpi4-zc-swd.cfg b/rpi4-zc-swd.cfg
new file mode 100644 (file)
index 0000000..7aad60e
--- /dev/null
+++ b/rpi4-zc-swd.cfg
@@ -0,0 +1,52 @@
+#
+# 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 stock 700MHz
+# bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET
+bcm2835gpio_speed_coeffs 146203 36
+
+# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
+# Header pin numbers: 23 22 19 21
+#bcm2835gpio_jtag_nums 11 25 10 9
+
+# Each of the SWD lines need a gpio number set: swclk swdio
+# Header pin numbers: 23 22
+#bcm2835gpio_swd_nums 11 25
+# swd gpio pins      swclk swio
+bcm2835gpio_swd_nums 27    17
+
+# If you define trst or srst, use appropriate reset_config
+# Header pin numbers: TRST - 26, SRST - 18
+
+#bcm2835gpio_trst_num 22
+#reset_config trst_only
+
+# bcm2835gpio_srst_num 24
+# reset_config srst_only srst_push_pull
+
+# or if you have both connected,
+# reset_config trst_and_srst srst_push_pull
+
+adapter speed 100
+transport select swd
+
+## test which chip this is
+#swd newdap chip cpu -enable
+#dap create chip.dap -chain-position chip.cpu
+#target create chip.cpu cortex_m -dap chip.dap
+#init
+#dap info
+
+