From cd1b23ff38ee3117268ded59ed5b6f1575786911 Mon Sep 17 00:00:00 2001
From: Zhitao He <hematthew@gmail.com>
Date: Wed, 9 Jan 2019 14:02:01 +0100
Subject: [PATCH] fix temperature sensor reading in nrf52dk platform, which was
 stuck at zero

---
 arch/platform/nrf52dk/dev/temperature-sensor.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/platform/nrf52dk/dev/temperature-sensor.c b/arch/platform/nrf52dk/dev/temperature-sensor.c
index 5aac8b3ef..3af30c4af 100644
--- a/arch/platform/nrf52dk/dev/temperature-sensor.c
+++ b/arch/platform/nrf52dk/dev/temperature-sensor.c
@@ -64,7 +64,15 @@ static int
 value(int type)
 {
 #ifndef SOFTDEVICE_PRESENT
-  return nrf_temp_read();
+  int32_t volatile temp;
+
+  NRF_TEMP->TASKS_START = 1;
+  while(NRF_TEMP->EVENTS_DATARDY == 0);
+  NRF_TEMP->EVENTS_DATARDY = 0;
+  temp = nrf_temp_read();
+  NRF_TEMP->TASKS_STOP = 1;
+
+  return temp;
 #else
   int32_t temp;
   sd_temp_get(&temp);