Release LoRa CS pin after deep sleep

#21

Author: todd-herbert

docs/WirelessPaper/wireless_paper.md

@@ -124,3 +124,5 @@ esp_deep_sleep_start();
 ```
 
 The 18uA current is only achievable when powering with the battery connector. When USB is connected, an orange LED remains on.
+
+The library will automatically reverse this sleep state when the display is next used. If you need to use the LoRa radio before this, you may need to manually call `Platform::VExtOn()`.

library.properties

@@ -1,5 +1,5 @@
 name=heltec-eink-modules
-version=4.5.0
+version=4.5.1
 author=Todd Herbert
 maintainer=Todd Herbert
 sentence=Third party graphics library for Heltec E-Ink modules. 

src/Platforms/WirelessPaper/power_controls.cpp

@@ -8,6 +8,8 @@ namespace Platform {
 
     // Enable power to Wireless Paper's interfaces (Display + LoRa P/A)
     void VExtOn() {
+        gpio_hold_dis((gpio_num_t)PIN_LORA_NSS); // Release any hold on LoRa radio's CS pin (see Platform::prepareToSleep)
+
         pinMode(PIN_PCB_VEXT, OUTPUT);          // OUTPUT, incase this is the first call
 
         if (digitalRead(PIN_PCB_VEXT) != VEXT_ACTIVE) {     // Read, to avoid waiting unnecessarily for power to stabilize