From d23eeaa571cd8461fc8fe2f7833588c52716aa2f Mon Sep 17 00:00:00 2001
From: Alexis Grojean <alexis.grojean@ledger.fr>
Date: Thu, 23 May 2024 14:36:55 +0200
Subject: [PATCH] Add new init_comm function to initialize COMM_REF global.

---
 ledger_device_sdk/src/nbgl.rs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/ledger_device_sdk/src/nbgl.rs b/ledger_device_sdk/src/nbgl.rs
index 0f0dc7a7..b56bbb9d 100644
--- a/ledger_device_sdk/src/nbgl.rs
+++ b/ledger_device_sdk/src/nbgl.rs
@@ -73,6 +73,16 @@ impl<'a> Into<nbgl_icon_details_t> for &NbglGlyph<'a> {
     }
 }
 
+/// Initialize the global COMM_REF variable with the provided Comm instance.
+/// This function should be called from the main function of the application.
+/// The COMM_REF variable is used by the NBGL API to detect touch events and
+/// APDU reception.
+pub fn init_comm(comm: &mut Comm) {
+    unsafe {
+        COMM_REF = Some(transmute(comm));
+    }
+}
+
 /// IO function used in the synchronous NBGL C library to process
 /// events (touch, buttons, etc.) or detect if an APDU was received.
 /// It returns true if an APDU was received, false otherwise.
@@ -179,10 +189,7 @@ pub struct NbglHomeAndSettings<'a> {
 }
 
 impl<'a> NbglHomeAndSettings<'a> {
-    pub fn new(comm: &mut Comm) -> NbglHomeAndSettings<'a> {
-        unsafe {
-            COMM_REF = Some(transmute(comm));
-        }
+    pub fn new() -> NbglHomeAndSettings<'a> {
         NbglHomeAndSettings {
             app_name: "Rust App\0".as_ptr() as *const c_char,
             icon: core::ptr::null(),