From f122e790d246cddc8b6a39af2b3f1ab664fc40ff Mon Sep 17 00:00:00 2001
From: Tom Fifield <tom@tomfifield.net>
Date: Tue, 17 Sep 2024 09:03:19 +0800
Subject: [PATCH] Increase Pico GPS FIFO Buffer size

As discovered and tested by @Mictronics, default Serial FIFO size
on the Pico is 32bytes, which is not enough for GPS messages.

This patch increases the Serial GPS FIFO buffer size to 256
for PICOs only.

fixes https://github.com/meshtastic/firmware/issues/3989
---
 src/gps/GPS.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/gps/GPS.cpp b/src/gps/GPS.cpp
index 8abb4edb1c..1988991c81 100644
--- a/src/gps/GPS.cpp
+++ b/src/gps/GPS.cpp
@@ -26,6 +26,8 @@
 
 #if defined(NRF52840_XXAA) || defined(NRF52833_XXAA) || defined(ARCH_ESP32) || defined(ARCH_PORTDUINO)
 HardwareSerial *GPS::_serial_gps = &Serial1;
+#elif defined(RPI_PICO_WAVESHARE)
+SerialUART *GPS::_serial_gps = &Serial1;
 #else
 HardwareSerial *GPS::_serial_gps = NULL;
 #endif
@@ -1201,6 +1203,10 @@ GnssModel_t GPS::probe(int serialSpeed)
 #if defined(ARCH_NRF52) || defined(ARCH_PORTDUINO) || defined(ARCH_RP2040) || defined(ARCH_STM32WL)
     _serial_gps->end();
     _serial_gps->begin(serialSpeed);
+#elif defined(RPI_PICO_WAVESHARE)
+    _serial_gps->end();
+    _serial_gps->setFIFOSize(256);
+    _serial_gps->begin(serialSpeed);
 #else
     if (_serial_gps->baudRate() != serialSpeed) {
         LOG_DEBUG("Setting Baud to %i\n", serialSpeed);
@@ -1268,6 +1274,10 @@ GnssModel_t GPS::probe(int serialSpeed)
 #if defined(ARCH_NRF52) || defined(ARCH_PORTDUINO) || defined(ARCH_RP2040) || defined(ARCH_STM32WL)
         _serial_gps->end();
         _serial_gps->begin(serialSpeed);
+#elif defined(RPI_PICO_WAVESHARE)
+        _serial_gps->end();
+        _serial_gps->setFIFOSize(256);
+        _serial_gps->begin(serialSpeed);
 #else
         _serial_gps->updateBaudRate(serialSpeed);
 #endif
@@ -1428,6 +1438,9 @@ GPS *GPS::createGps()
         LOG_DEBUG("Using GPIO%d for GPS RX\n", new_gps->rx_gpio);
         LOG_DEBUG("Using GPIO%d for GPS TX\n", new_gps->tx_gpio);
         _serial_gps->begin(GPS_BAUDRATE, SERIAL_8N1, new_gps->rx_gpio, new_gps->tx_gpio);
+#elif defined(RPI_PICO_WAVESHARE)
+        _serial_gps->setFIFOSize(256);
+        _serial_gps->begin(GPS_BAUDRATE);
 #else
         _serial_gps->begin(GPS_BAUDRATE);
 #endif