From 766287d3fddde8c49065534e069ad1261422e19b Mon Sep 17 00:00:00 2001
From: Mictronics <github@mictronics.de>
Date: Tue, 16 Jan 2024 15:28:25 +0100
Subject: [PATCH] Use RP2040 SerialUART instead of Arduino HardwareSerial to
 access setFIFOSize. Increase FIFO size to 256 byte reading entire NMEA
 sentences at once.

---
 src/gps/GPS.cpp | 6 ++++--
 src/gps/GPS.h   | 5 ++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/gps/GPS.cpp b/src/gps/GPS.cpp
index d6ffabc506..f2b6fc1d8c 100644
--- a/src/gps/GPS.cpp
+++ b/src/gps/GPS.cpp
@@ -16,9 +16,10 @@
 #define GPS_RESET_MODE HIGH
 #endif
 
-#if defined(NRF52840_XXAA) || defined(NRF52833_XXAA) || defined(ARCH_ESP32) || defined(aLinuxInputImpl) ||                       \
-    defined(RPI_PICO_WAVESHARE)
+#if defined(NRF52840_XXAA) || defined(NRF52833_XXAA) || defined(ARCH_ESP32) || defined(aLinuxInputImpl)
 HardwareSerial *GPS::_serial_gps = &Serial1;
+#elif defined(RPI_PICO_WAVESHARE)
+SerialUART *GPS::_serial_gps = &Serial1;
 #else
 HardwareSerial *GPS::_serial_gps = NULL;
 #endif
@@ -1022,6 +1023,7 @@ GPS *GPS::createGps()
         _serial_gps->begin(GPS_BAUDRATE, SERIAL_8N1, new_gps->rx_gpio, new_gps->tx_gpio);
 
 #else
+        _serial_gps->setFIFOSize(256);
         _serial_gps->begin(GPS_BAUDRATE);
 #endif
 
diff --git a/src/gps/GPS.h b/src/gps/GPS.h
index db20c4b685..13fd85f87e 100644
--- a/src/gps/GPS.h
+++ b/src/gps/GPS.h
@@ -93,8 +93,11 @@ class GPS : private concurrency::OSThread
 
   public:
     /** If !NULL we will use this serial port to construct our GPS */
+#if defined(RPI_PICO_WAVESHARE)
+    static SerialUART *_serial_gps;
+#else
     static HardwareSerial *_serial_gps;
-
+#endif
     static uint8_t _message_PMREQ[];
     static const uint8_t _message_CFG_RXM_PSM[];
     static const uint8_t _message_CFG_RXM_ECO[];