From a68f7e4ce3b24720f35e4a9cf125d91185645c57 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Sun, 18 Sep 2022 23:13:15 +0200
Subject: [PATCH] nrf: add ReadTemperature method

Similar to the rp2040, the nrf has an on-board temperature sensor.

The main reason why I added this function was to show how this new API
is more general and can be used on multiple chips.
---
 src/machine/machine_nrf.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/machine/machine_nrf.go b/src/machine/machine_nrf.go
index 2d533db97..2f8360679 100644
--- a/src/machine/machine_nrf.go
+++ b/src/machine/machine_nrf.go
@@ -372,3 +372,14 @@ func GetRNG() (ret uint32, err error) {
 
 	return ret, nil
 }
+
+// ReadTemperature reads the silicon die temperature of the chip. The return
+// value is in milli-celsius.
+func ReadTemperature() int32 {
+	nrf.TEMP.TASKS_START.Set(1)
+	for nrf.TEMP.EVENTS_DATARDY.Get() == 0 {
+	}
+	temp := int32(nrf.TEMP.TEMP.Get()) * 250 // the returned value is in units of 0.25°C
+	nrf.TEMP.EVENTS_DATARDY.Set(0)
+	return temp
+}