UART2: Reduce FIFO threshold, pin to core 1.

Author: nseidle

Firmware/RTK_Surveyor/Begin.ino

@@ -327,17 +327,27 @@ void beginUART2()
 {
   rBuffer = (uint8_t*)malloc(settings.gnssHandlerBufferSize);
 
-  if (pinUART2TaskHandle == NULL) xTaskCreatePinnedToCore(
-      pinUART2Task,
-      "UARTStart", //Just for humans
-      2000, //Stack Size
-      NULL, //Task input parameter
-      0, // Priority, with 3 (configMAX_PRIORITIES - 1) being the highest, and 0 being the lowest
-      &pinUART2TaskHandle, //Task handle
-      0); //Core where task should run, 0=core, 1=Arduino
+  //TODO - For testing, pin to core 1
+  serialGNSS.setRxBufferSize(settings.uartReceiveBufferSize);
+  serialGNSS.setTimeout(settings.serialTimeoutGNSS);
+  serialGNSS.begin(settings.dataPortBaud); //UART2 on pins 16/17 for SPP. The ZED-F9P will be configured to output NMEA over its UART1 at the same rate.
 
-  while (uart2pinned == false) //Wait for task to run once
-    delay(1);
+  //Reduce threshold value above which RX FIFO full interrupt is generated
+  //Allows more time between when the UART interrupt occurs and when the FIFO buffer overruns
+  //serialGNSS.setRxFIFOFull(50); //Available in >v2.0.5
+  uart_set_rx_full_threshold(2, 50); //uart_num, threshold
+  
+  //  if (pinUART2TaskHandle == NULL) xTaskCreatePinnedToCore(
+  //      pinUART2Task,
+  //      "UARTStart", //Just for humans
+  //      2000, //Stack Size
+  //      NULL, //Task input parameter
+  //      0, // Priority, with 3 (configMAX_PRIORITIES - 1) being the highest, and 0 being the lowest
+  //      &pinUART2TaskHandle, //Task handle
+  //      0); //Core where task should run, 0=core, 1=Arduino
+  //
+  //  while (uart2pinned == false) //Wait for task to run once
+  //    delay(1);
 }
 
 //Assign UART2 interrupts to the core 0. See: https://github.com/espressif/arduino-esp32/issues/3386
@@ -347,6 +357,11 @@ void pinUART2Task( void *pvParameters )
   serialGNSS.setTimeout(settings.serialTimeoutGNSS);
   serialGNSS.begin(settings.dataPortBaud); //UART2 on pins 16/17 for SPP. The ZED-F9P will be configured to output NMEA over its UART1 at the same rate.
 
+  //Reduce threshold value above which RX FIFO full interrupt is generated
+  //Allows more time between when the UART interrupt occurs and when the FIFO buffer overruns
+  //serialGNSS.setRxFIFOFull(50); //Available in >v2.0.5
+  uart_set_rx_full_threshold(2, 50); //uart_num, threshold
+
   uart2pinned = true;
 
   vTaskDelete( NULL ); //Delete task once it has run once