Update README.md to contain instructions for Waveshare Pico-LoRa-SX1262-868M

Author: ThomasLeister

README.md

@@ -1,5 +1,5 @@
 # pico-lorawan
-Enable LoRaWAN communications on your [Raspberry Pi Pico](https://www.raspberrypi.org/products/raspberry-pi-pico/) or any RP2040 based board using a [Semtech SX1276 radio module](https://www.semtech.com/apps/product.php?pn=SX1276).
+Enable LoRaWAN communications on your [Raspberry Pi Pico](https://www.raspberrypi.org/products/raspberry-pi-pico/) or any RP2040 based board using a [Semtech SX1276 radio module](https://www.semtech.com/apps/product.php?pn=SX1276) or [Waveshare's SX1262-based LoRaWAN module](https://www.waveshare.com/wiki/Pico-LoRa-SX1262-868M).
 
 Based on the Semtech's [LoRaWAN end-device stack implementation and example projects](https://github.com/Lora-net/LoRaMac-node).
 
@@ -11,9 +11,13 @@ Based on the Semtech's [LoRaWAN end-device stack implementation and example proj
  * Semtech SX1276 board
    * [Adafruit RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz - RadioFruit](https://www.adafruit.com/product/3072)
    * [Adafruit LoRa Radio FeatherWing - RFM95W 900 MHz - RadioFruit](https://www.adafruit.com/product/3231) 
+ * Semtech SX1262 board
+   * [Waveshare Pico-LoRa-SX1262-868M](https://www.waveshare.com/wiki/Pico-LoRa-SX1262-868M) | [Shop](https://www.waveshare.com/pico-lora-sx1262-868m.htm)
 
 ### Default Pinout
 
+Default Pinout for Semtech SX1276:
+
 | Raspberry Pi Pico / RP2040 | Semtech SX1276 |
 | ----------------- | -------------- |
 | 3.3V | VCC |
@@ -26,8 +30,63 @@ Based on the Semtech's [LoRaWAN end-device stack implementation and example proj
 | GPIO 9 | RESET |
 | GPIO 10 | DIO1 / G1 |
 
+Default Pinout for Semtech SX1262 on Waveshare Pico-LoRa-SX1262-868M:
+
+| Raspberry Pi Pico / RP2040 | Waveshare Pico-LoRa-SX1262-868M |
+| ----------------- | -------------- |
+| 3.3V | VCC |
+| GND | GND |
+| GPIO 10 | SCK |
+| GPIO 11 | MOSI |
+| GPIO 12 | MISO |
+| GPIO 3 | NSS / CS |
+| GPIO 15 | RESET |
+| GPIO 20 | DIO1 |
+| GPIO 2 | BUSY |
+
 GPIO pins are configurable in examples or API.
 
+## Enabling support for Waveshare Pico-LoRa-SX1262-868M
+
+By default this library only supports the Semtech SX1276 boards mentioned in the first section. Support for Waveshare's SX1262-based Raspberry Pi Pico Hat is available, but needs to be enabled actively. 
+
+Take the following steps to switch from SX1276 to Waveshare SX1262 support: 
+
+Uncomment 
+
+```
+set(WITH_WAVESHARE_SX126X ON)
+```
+
+in  `CMakeLists.txt`.
+
+In your example application, e.g. otaa_temperature_led/ set the region to EU868 in `config.h`:
+
+```
+#define LORAWAN_REGION          LORAMAC_REGION_EU868
+```
+
+_(and also provide your Device EUI, App EUI and App Key here!)_
+
+In the example application's `main.c` make sure that you're using the proper `sx12xx_settings` for your SX1262 Waveshare module:
+
+```
+const struct lorawan_sx12xx_settings sx12xx_settings = {
+    .spi = {
+        .inst = spi1,
+        .mosi = 11,
+        .miso = 12,
+        .sck  = 10,
+        .nss  = 3
+    },
+    .reset = 15,
+    .busy = 2,
+    .dio1  = 20
+};
+```
+
+_**There is no guarantee that other SX1262-based boards will work. Tests have only been run using Waveshare's board.**_
+
 ## Examples
 
 See [examples](examples/) folder.
@@ -60,5 +119,7 @@ make
 
 A big thanks to [Alasdair Allan](https://github.com/aallan) for his initial testing of EU868 support!
 
+Thanks to Waveshare and [siuwahzhong](https://github.com/siuwahzhong) for providing their modified version of this library. Parts of their work have been merged back into this library by [Thomas Leister](https://github.com/ThomasLeister). Original source: [ZIP](https://www.waveshare.com/w/upload/0/08/Pico-LoRa-SX1262-868M_Code.zip) | [GitHub](https://github.com/siuwahzhong/lorawan-library-for-pico) 
+
 This project was created on behalf of the [Arm Software Developers](https://developer.arm.com/) team, follow them on Twitter: [@ArmSoftwareDev](https://twitter.com/armsoftwaredev) and YouTube: [Arm Software Developers](https://www.youtube.com/channel/UCHUAckhCfRom2EHDGxwhfOg) for more resources!