part 1

crossbow/radio_node.cpp

@@ -0,0 +1,53 @@
+#include "radio_node.h"
+#include "lora.h"
+
+RadioNode::RadioNode(void) {
+
+}
+
+static uint8_t RadioNode::getRadioRssi(void)
+{
+    return 164 - constrain(LoRa.packetRssi() * -1, 0, 164);
+}
+
+static uint8_t RadioNode::getRadioSnr(void)
+{
+    return (uint8_t) constrain(LoRa.packetSnr(), 0, 255);
+}
+
+uint8_t RadioNode::getChannel(void) {
+    return _channel;
+}
+
+uint32_t RadioNode::getChannelEntryMillis(void) {
+    return _channelEntryMillis;
+}
+
+static uint32_t RadioNode::getFrequencyForChannel(uint8_t channel) {
+    return RADIO_FREQUENCY_MIN + (RADIO_CHANNEL_WIDTH * channel);
+}
+
+static uint8_t RadioNode::getNextChannel(uint8_t channel) {
+    return (channel + RADIO_HOP_OFFSET) % RADIO_CHANNEL_COUNT;
+}
+
+static uint8_t RadioNode::getPrevChannel(uint8_t channel) {
+    return (RADIO_CHANNEL_COUNT + channel - RADIO_HOP_OFFSET) % RADIO_CHANNEL_COUNT;
+}
+
+void RadioNode::hopFrequency(bool forward, uint8_t fromChannel, uint32_t timestamp) {
+    _channelEntryMillis = timestamp;
+
+    if (forward) {
+        _channel = RadioNode::getNextChannel(fromChannel);
+    } else {
+        _channel = RadioNode::getPrevChannel(fromChannel);
+    }
+
+    // And set hardware
+    LoRa.sleep();
+    LoRa.setFrequency(
+        RadioNode::getFrequencyForChannel(_channel)
+    );
+    LoRa.idle();
+}