From da80e8bf651072cfc844ad9f119888ce366e0c74 Mon Sep 17 00:00:00 2001
From: universam1 <gh@lang-sam.de>
Date: Mon, 18 Dec 2017 02:16:41 +0100
Subject: [PATCH] saving reset pin (#60)
* releasing pins ss and reset
* only make reset optional
* style and description
* Update API doc
---
API.md | 6 ++++++
src/LoRa.cpp | 18 ++++++++++--------
2 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/API.md b/API.md
index d5b0abc..07c808e 100644
--- a/API.md
+++ b/API.md
@@ -32,6 +32,12 @@ LoRa.setPins(ss, reset, dio0);
This call is optional and only needs to be used if you need to change the default pins used.
+#### No MCU controlled reset pin
+
+To save further pins one could connect the reset pin of the MCU with reset pin of the radio thus resetting only during startup.
+
+* `reset` - set to `-1` to omit this pin
+
### Set SPI Frequency
Override the default SPI frequency of 10 MHz used by the library. **Must** be called before `LoRa.begin()`.
diff --git a/src/LoRa.cpp b/src/LoRa.cpp
index 9a55046..1f75d15 100644
--- a/src/LoRa.cpp
+++ b/src/LoRa.cpp
@@ -66,17 +66,19 @@ int LoRaClass::begin(long frequency)
{
// setup pins
pinMode(_ss, OUTPUT);
- pinMode(_reset, OUTPUT);
-
- // perform reset
- digitalWrite(_reset, LOW);
- delay(10);
- digitalWrite(_reset, HIGH);
- delay(10);
-
// set SS high
digitalWrite(_ss, HIGH);
+ if (_reset != -1) {
+ pinMode(_reset, OUTPUT);
+
+ // perform reset
+ digitalWrite(_reset, LOW);
+ delay(10);
+ digitalWrite(_reset, HIGH);
+ delay(10);
+ }
+
// start SPI
SPI.begin();