From 998b1329c87bf436737a92fd256997be278c5e6f Mon Sep 17 00:00:00 2001
From: ole00 <ole00@post.cz>
Date: Wed, 24 Apr 2024 23:16:14 +0100
Subject: [PATCH] jtag: improve detection of power switch being turned off

---
 jtag_xsvf_player.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/jtag_xsvf_player.h b/jtag_xsvf_player.h
index 66509a9..7167052 100644
--- a/jtag_xsvf_player.h
+++ b/jtag_xsvf_player.h
@@ -979,6 +979,12 @@ static void jtag_play_xsvf(jtag_port_t* port)
   if (xsvf->xcomplete) {
       Serial.println(F("Q-0,OK"));
   }
+  //the 3 pins must be low or else the vref might be triggered next time
+  digitalWrite(port->tms, 0);
+  digitalWrite(port->tdi, 0);
+  digitalWrite(port->tck, 0);
+  delay(100);
+
   // put the jtag port pins into High-Z (vref already is input)
   pinMode(port->tms, INPUT);
   pinMode(port->tdi, INPUT);