Work on ESP32 compatibility

Config.h

@@ -79,6 +79,10 @@
 
 		#define EEPROM_SIZE 1024
 		#define EEPROM_OFFSET EEPROM_SIZE-EEPROM_RESERVED
+
+		#define GPS_BAUD_RATE 9600
+		#define PIN_GPS_TX 12
+		#define PIN_GPS_RX 34
 	#endif
 
 	#define eeprom_addr(a) (a+EEPROM_OFFSET)

RNode_Firmware.ino

@@ -34,7 +34,7 @@ void setup() {
     delay(500);
     EEPROM.begin(EEPROM_SIZE);
     // TODO: Check this
-    //Serial.setRxBufferSize(CONFIG_UART_BUFFER_SIZE);
+    Serial.setRxBufferSize(CONFIG_UART_BUFFER_SIZE);
   #endif
 
   // Seed the PRNG
@@ -71,13 +71,15 @@ void setup() {
 
   #if MCU_VARIANT == MCU_ESP32
     // ESP32-specific initialisation
-    // The WDT is disabled for now. This
-    // should be re-enabled as soon as any
-    // Core0-related features are used
-    rtc_wdt_protect_off();
-    rtc_wdt_disable();
+    Serial1.begin(GPS_BAUD_RATE, SERIAL_8N1, PIN_GPS_RX, PIN_GPS_TX);
+    
+    // rtc_wdt_protect_off();
     // rtc_wdt_set_stage(RTC_WDT_STAGE0, RTC_WDT_STAGE_ACTION_RESET_SYSTEM);
     // rtc_wdt_set_time(RTC_WDT_STAGE0, 25);
+    // rtc_wdt_protect_on();
+    // rtc_wdt_enable();
+
+    kiss_indicate_reset();
   #endif
 
   // Validate board health, EEPROM and config
@@ -108,7 +110,27 @@ inline void kiss_write_packet() {
   #endif
 }
 
+inline void getPacketData(int len) {
+  while (len-- && read_len < MTU) {
+    pbuf[read_len++] = LoRa.read();
+  }
+}
+
+#if MCU_VARIANT == MCU_ESP32
+  portMUX_TYPE isr_lock = portMUX_INITIALIZER_UNLOCKED;
+#endif
+
+bool handling_packet = false;
 void ISR_VECT receive_callback(int packet_size) {
+  #if MCU_VARIANT == MCU_ESP32
+    portENTER_CRITICAL_ISR(&isr_lock);
+  #endif
+
+  #if MCU_VARIANT == MCU_ESP32
+  if (!handling_packet) {
+    handling_packet = true;
+    #endif
+
     if (!promisc) {
       // The standard operating mode allows large
       // packets with a payload up to 500 bytes,
@@ -132,6 +154,7 @@ void ISR_VECT receive_callback(int packet_size) {
         #endif
 
         getPacketData(packet_size);
+
       } else if (isSplitPacket(header) && seq == sequence) {
         // This is the second part of a split
         // packet, so we add it to the buffer
@@ -145,6 +168,7 @@ void ISR_VECT receive_callback(int packet_size) {
         getPacketData(packet_size);
         seq = SEQ_UNSET;
         ready = true;
+
       } else if (isSplitPacket(header) && seq != sequence) {
         // This split packet does not carry the
         // same sequence id, so we must assume
@@ -159,6 +183,7 @@ void ISR_VECT receive_callback(int packet_size) {
         #endif
 
         getPacketData(packet_size);
+
       } else if (!isSplitPacket(header)) {
         // This is not a split packet, so we
         // just read it and set the ready
@@ -211,11 +236,19 @@ void ISR_VECT receive_callback(int packet_size) {
         kiss_write_packet();
 
       #else
-      // Promiscous mode is not supported on ESP32 for now
-      getPacketData(packet_size);
         read_len = 0;
+        getPacketData(packet_size);
+        packet_ready = true;
+      #endif
+    #if MCU_VARIANT == MCU_ESP32
+    }
+    handling_packet = false;
     #endif
   }
+
+  #if MCU_VARIANT == MCU_ESP32
+    portEXIT_CRITICAL_ISR(&isr_lock);
+  #endif
 }
 
 
@@ -747,7 +780,7 @@ void serial_poll() {
 #if MCU_VARIANT != MCU_ESP32
   #define MAX_CYCLES 20
 #else
-  #define MAX_CYCLES 1
+  #define MAX_CYCLES 10
 #endif
 void buffer_serial() {
   if (!serial_buffering) {
@@ -768,6 +801,14 @@ void buffer_serial() {
       #endif
     }
 
+    #if MCU_VARIANT == MCU_ESP32
+      // Discard GPS data for now
+      c = 0;
+      while (c < MAX_CYCLES && Serial1.available()) {
+        uint8_t void_c = Serial1.read();
+      }
+    #endif
+
     serial_buffering = false;
   }
 }

Utilities.h

@@ -31,8 +31,8 @@ uint8_t boot_vector = 0x00;
 	void led_tx_on()  { digitalWrite(pin_led_tx, HIGH); }
 	void led_tx_off() { digitalWrite(pin_led_tx, LOW); }
 #elif MCU_VARIANT == MCU_ESP32
-	void led_rx_on()  { digitalWrite(pin_led_rx, LOW); }
-	void led_rx_off() {	digitalWrite(pin_led_rx, HIGH); }
+	void led_rx_on()  { digitalWrite(pin_led_rx, HIGH); }
+	void led_rx_off() {	digitalWrite(pin_led_rx, LOW); }
 	void led_tx_on()  { digitalWrite(pin_led_tx, LOW); }
 	void led_tx_off() { digitalWrite(pin_led_tx, HIGH); }
 #endif
@@ -216,6 +216,13 @@ void escapedSerialWrite(uint8_t byte) {
     Serial.write(byte);
 }
 
+void kiss_indicate_reset() {
+	Serial.write(FEND);
+	Serial.write(CMD_RESET);
+	Serial.write(CMD_RESET_BYTE);
+	Serial.write(FEND);
+}
+
 void kiss_indicate_error(uint8_t error_code) {
 	Serial.write(FEND);
 	Serial.write(CMD_ERROR);
@@ -389,12 +396,6 @@ inline uint8_t packetSequence(uint8_t header) {
 	return header >> 4;
 }
 
-inline void getPacketData(int len) {
-	while (len--) {
-		pbuf[read_len++] = LoRa.read();
-	}
-}
-
 void setSpreadingFactor() {
 	if (radio_online) LoRa.setSpreadingFactor(lora_sf);
 }