From 8df42f2390ff20866f2404789764d0267b59c35b Mon Sep 17 00:00:00 2001
From: Francisco Molina <femolina@uc.cl>
Date: Fri, 2 Oct 2020 12:49:15 +0200
Subject: [PATCH] cpu/cc2538: add RTT_MIN_OFFSET

---
 cpu/cc2538/include/periph_cpu.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpu/cc2538/include/periph_cpu.h b/cpu/cc2538/include/periph_cpu.h
index b73732c9a4..8623e44df2 100644
--- a/cpu/cc2538/include/periph_cpu.h
+++ b/cpu/cc2538/include/periph_cpu.h
@@ -344,6 +344,10 @@ typedef gpio_t adc_conf_t;
 #define RTT_ISR             isr_sleepmode
 #define RTT_MAX_VALUE       (0xffffffff)
 #define RTT_FREQUENCY       (CLOCK_OSC32K)
+/* When setting a new compare value, the value must be at least 5 more
+   than the current sleep timer value. Otherwise, the timer compare
+   event may be lost. */
+#define RTT_MIN_OFFSET      (5U)
 /** @} */
 
 /**