From 51f792a7cbd5edc3dff8b400891d26e6e4d892dc Mon Sep 17 00:00:00 2001
From: Maarten van der Schrieck <maarten@thingsconnected.nl>
Date: Sun, 16 Jul 2023 10:04:54 +0200
Subject: [PATCH] Fix register corruption due to colliding SPI transactions in
 FSK

In FSK Tx, the Dio1 interrupt may already fire while the SPI transaction for
SetOpMode is still in progress. This leads to registers 0x02 and further being
overwritten with junk data.

This is solved by disabling interrupts for this specific SetOpMode call.
---
 src/radio/sx1276/sx1276.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/radio/sx1276/sx1276.c b/src/radio/sx1276/sx1276.c
index fa89bbaf9..c373d0dbd 100644
--- a/src/radio/sx1276/sx1276.c
+++ b/src/radio/sx1276/sx1276.c
@@ -1125,7 +1125,9 @@ static void SX1276SetTx( uint32_t timeout )
 
     SX1276.Settings.State = RF_TX_RUNNING;
     TimerStart( &TxTimeoutTimer );
+    CRITICAL_SECTION_BEGIN();
     SX1276SetOpMode( RF_OPMODE_TRANSMITTER );
+    CRITICAL_SECTION_END();
 }
 
 void SX1276StartCad( void )