From c15509282eeb620b6ce70059ea10c4657cff7474 Mon Sep 17 00:00:00 2001
From: Nathan Perry <np@nathanperry.dev>
Date: Tue, 24 Sep 2024 00:13:11 -0400
Subject: pio i2s

---
 target-rp2040-rescue.cfg | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 target-rp2040-rescue.cfg

(limited to 'target-rp2040-rescue.cfg')

diff --git a/target-rp2040-rescue.cfg b/target-rp2040-rescue.cfg
new file mode 100644
index 0000000..b124dda
--- /dev/null
+++ b/target-rp2040-rescue.cfg
@@ -0,0 +1,28 @@
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+set _CHIPNAME rp2040
+set _CPUTAPID 0x01002927
+set _ENDIAN little
+
+swj_newdap $_CHIPNAME.rescue_dp cpu -dp-id $_CPUTAPID -instance-id 0xf
+set _TARGETNAME_0 $_CHIPNAME.rescue
+dap create $_TARGETNAME_0.dap -chain-position $_CHIPNAME.rescue_dp.cpu -ignore-syspwrupack
+
+# Have to init before we can do dpreg commands
+init
+
+# The rescue debug port uses the AP CTRL/STAT bit DBGPWRUPREQ to reset the
+# PSM (power on state machine) of the RP2040 with a flag set in the
+# VREG_AND_POR_CHIP_RESET register. Once the reset is released
+# (by clearing the DBGPWRUPREQ flag), the bootrom will run, see this flag,
+# and halt. Allowing the user to load some fresh code, rather than loading
+# the potentially broken code stored in flash
+
+# Clear DBGPWRUPREQ
+$_TARGETNAME_0.dap dpreg 0x4 0x00000000
+
+# Verifying CTRL/STAT is 0
+$_TARGETNAME_0.dap dpreg 0x4
+
+echo "Now attach a debugger to your RP2040 and load some code"
-- 
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