From 724307a8eb25acb34b4a14d80692197bc4f766be Mon Sep 17 00:00:00 2001
From: Maciej Kobus <webhdx@gmail.com>
Date: Sun, 11 Aug 2024 22:10:14 +0200
Subject: [PATCH] Set GP7 to high impedance for a good measure

---
 src/picoboot.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/picoboot.c b/src/picoboot.c
index a11b75d..df19f35 100644
--- a/src/picoboot.c
+++ b/src/picoboot.c
@@ -14,7 +14,8 @@
 #include "picoboot.pio.h"
 #include "endian.h"
 
-const uint PIN_LED = 25;                // Status LED
+const uint PIN_LED = 25;                    // Status LED
+const uint PIN_LEGACY_DI = 7;
 
 extern const uint32_t __payload[];
 extern const uint32_t __payload_end[];
@@ -58,6 +59,11 @@ void main()
     gpio_set_dir(PIN_LED, GPIO_OUT);
     gpio_put(PIN_LED, true);
 
+    // set legacy DI pin GP7 to high impedance state
+    gpio_init(PIN_LEGACY_DI); 
+    gpio_set_dir(PIN_LEGACY_DI, GPIO_IN);
+    gpio_disable_pulls(PIN_LEGACY_DI);
+
     size_t payload_size = validate_payload();
     if (payload_size == SIZE_MAX) {
         while (true) {