From 3086b1bb589bb0d41aba3940faa7a9900b72be69 Mon Sep 17 00:00:00 2001
From: Manuel Bl <10954524+manuelbl@users.noreply.github.com>
Date: Tue, 5 Jan 2021 21:26:36 +0100
Subject: [PATCH] Static word-aligned buffer for SPI

---
 src/lmic/radio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/lmic/radio.c b/src/lmic/radio.c
index d6cc908..92f69ee 100644
--- a/src/lmic/radio.c
+++ b/src/lmic/radio.c
@@ -382,10 +382,11 @@ static void writeReg (u1_t addr, u1_t data ) {
     hal_spi_write(addr | 0x80, &data, 1);
 }
 
+static u1_t reg_value_buf[1];
+
 static u1_t readReg (u1_t addr) {
-    u1_t buf[1];
-    hal_spi_read(addr & 0x7f, buf, 1);
-    return buf[0];
+    hal_spi_read(addr & 0x7f, reg_value_buf, 1);
+    return reg_value_buf[0];
 }
 
 static void writeBuf (u1_t addr, xref2u1_t buf, u1_t len) {