From 2d1a05d447316d2c21b3c09a75f5c4d6386ae56d Mon Sep 17 00:00:00 2001
From: "Morgan 'ARR\\!' Allen" <morganrallen@gmail.com>
Date: Sat, 22 Feb 2020 08:56:41 -0800
Subject: [PATCH] CAD!

---
 main/esp32-lora.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/main/esp32-lora.c b/main/esp32-lora.c
index 3b5cb59..5245422 100644
--- a/main/esp32-lora.c
+++ b/main/esp32-lora.c
@@ -243,6 +243,18 @@ void lora32_enable_continuous_rx(lora32_cfg_t *lora) {
   lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_CONTINUOUS);
 }
 
+void lora32_enable_cad(lora32_cfg_t *lora) {
+  if((lora->cad_done != NULL) | (lora->cad_detected != NULL)) {
+    ESP_LOGD(TAG, "Setting DIO0 to CAD Detect");
+
+    lora32_write_reg(lora, REG_DIO_MAPPING_1, DIO0_MODE_CADDET);
+  }
+
+  ESP_LOGD(TAG, "Enabling CAD Detection Mode");
+
+  lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_CAD_DETECT);
+}
+
 void lora32_set_coding_rate(lora32_cfg_t *lora, uint8_t d) {
   if(d < 5) d = 5;
   else if(d > 8) d = 8;
@@ -284,7 +296,6 @@ static void IRAM_ATTR lora32_dio0_task(void *arg) {
     ESP_LOGD(TAG, "clearing irqs");
     lora32_write_reg(lora, REG_IRQ_FLAGS, irqs);
 
-    // is this the right check? seems to work but looks off
     // TODO handle header validation
     if((irqs & IRQ_RX_DONE) == IRQ_RX_DONE) {
       lora32_handle_receive(lora);
@@ -293,6 +304,22 @@ static void IRAM_ATTR lora32_dio0_task(void *arg) {
     if((irqs & IRQ_TX_DONE) == IRQ_TX_DONE) {
       if(lora->tx_done != NULL) lora->tx_done();
     }
+
+    bool cad_detected = false;
+
+    if((irqs & IRQ_CAD_DETECTED) == IRQ_CAD_DETECTED) {
+      // this is for the next clause, CAD Done callback gets true/false
+      cad_detected = true;
+
+      // no need for arg, cad_detected callback is always presummed true
+      if(lora->cad_detected != NULL) lora->cad_detected();
+    }
+
+    if((irqs & IRQ_CAD_DONE) == IRQ_CAD_DONE) {
+      // cad_done gets true/false from above, when activity is detected
+      // these *should* fire at the same time, defaults to false
+      if(lora->cad_done != NULL) lora->cad_done(cad_detected);
+    }
   }
 }