From 8017555ea3ec07cf93be6a4b02dc2c7d1083a599 Mon Sep 17 00:00:00 2001
From: Terry Moore <tmm@mcci.com>
Date: Fri, 22 Nov 2024 09:57:18 -0500
Subject: [PATCH] #968: further workaround to defeat optimization

---
 src/lmic/lmic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lmic/lmic.c b/src/lmic/lmic.c
index 6323fdb6..e16816fd 100644
--- a/src/lmic/lmic.c
+++ b/src/lmic/lmic.c
@@ -2608,7 +2608,8 @@ static void engineUpdate_inner (void) {
         // otherwise the compiler falsely assumes that the computation
         // is positive.
         //
-        if( ((ostime_t) (txbeg - (now + TX_RAMPUP))) < 0 ) {
+        volatile ostime_t tdiff = txbeg - (now + TX_RAMPUP);
+        if( tdiff < 0 ) {
             // We could send right now!
             txbeg = now;
             dr_t txdr = (dr_t)LMIC.datarate;