From 992c02c6619a764ffe3a8033234696128fe581cb Mon Sep 17 00:00:00 2001
From: deadprogram <ron@hybridgroup.com>
Date: Sun, 17 Sep 2023 19:50:39 +0200
Subject: [PATCH] lora: add starting point for US915 settings

Signed-off-by: deadprogram <ron@hybridgroup.com>
---
 lora/config.go               |  1 +
 lora/lorawan/region/us915.go | 51 ++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 lora/lorawan/region/us915.go

diff --git a/lora/config.go b/lora/config.go
index 84e77bb..703eacd 100644
--- a/lora/config.go
+++ b/lora/config.go
@@ -80,6 +80,7 @@ const (
 const (
 	MHz_868_1 = 868100000
 	MHz_868_5 = 868500000
+	MHz_902_3 = 902300000
 	MHz_916_8 = 916800000
 	MHz_923_3 = 923300000
 )
diff --git a/lora/lorawan/region/us915.go b/lora/lorawan/region/us915.go
new file mode 100644
index 0000000..55bbd91
--- /dev/null
+++ b/lora/lorawan/region/us915.go
@@ -0,0 +1,51 @@
+package region
+
+import "tinygo.org/x/drivers/lora"
+
+const (
+	US915_DEFAULT_PREAMBLE_LEN = 8
+	US915_DEFAULT_TX_POWER_DBM = 20
+)
+
+type RegionSettingsUS915 struct {
+	joinRequestChannel *Channel
+	joinAcceptChannel  *Channel
+	uplinkChannel      *Channel
+}
+
+// see https://www.thethingsnetwork.org/docs/lorawan/regional-parameters/#us902-928-ism-band
+
+func US915() *RegionSettingsUS915 {
+	return &RegionSettingsUS915{
+		joinRequestChannel: &Channel{lora.MHz_902_3,
+			lora.Bandwidth_125_0,
+			lora.SpreadingFactor10,
+			lora.CodingRate4_5,
+			US915_DEFAULT_PREAMBLE_LEN,
+			US915_DEFAULT_TX_POWER_DBM},
+		joinAcceptChannel: &Channel{lora.MHz_923_3,
+			lora.Bandwidth_500_0,
+			lora.SpreadingFactor7,
+			lora.CodingRate4_5,
+			US915_DEFAULT_PREAMBLE_LEN,
+			US915_DEFAULT_TX_POWER_DBM},
+		uplinkChannel: &Channel{lora.MHz_902_3,
+			lora.Bandwidth_125_0,
+			lora.SpreadingFactor7,
+			lora.CodingRate4_5,
+			US915_DEFAULT_PREAMBLE_LEN,
+			US915_DEFAULT_TX_POWER_DBM},
+	}
+}
+
+func (r *RegionSettingsUS915) JoinRequestChannel() *Channel {
+	return r.joinRequestChannel
+}
+
+func (r *RegionSettingsUS915) JoinAcceptChannel() *Channel {
+	return r.joinAcceptChannel
+}
+
+func (r *RegionSettingsUS915) UplinkChannel() *Channel {
+	return r.uplinkChannel
+}