From b498c0bfbfe2630605318482b0ba2b619bee4663 Mon Sep 17 00:00:00 2001
From: Tom Fifield <tom@tomfifield.net>
Date: Fri, 9 Aug 2024 09:18:18 +0800
Subject: [PATCH] [WIP] Add support for Airoha AG3335 GPS (#4394)

* Add GPS detection code for Airoha AG3335

Airoha AG3335 is used in Seeed T-1000E Tracker

* Add support for Airoha AG3335

Airoha AG3335 is used in Seeed T-1000E Tracker. This adds
detection code, and code to configure its use.

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
---
 src/gps/GPS.cpp | 24 ++++++++++++++++++++++++
 src/gps/GPS.h   |  5 +++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/gps/GPS.cpp b/src/gps/GPS.cpp
index 93742a99a..fcc7c0bd6 100644
--- a/src/gps/GPS.cpp
+++ b/src/gps/GPS.cpp
@@ -504,6 +504,22 @@ bool GPS::setup()
             delay(250);
             _serial_gps->write("$CFGMSG,6,1,0\r\n");
             delay(250);
+        } else if (gnssModel == GNSS_MODEL_AG3335) {
+
+            _serial_gps->write("$PAIR066,1,0,1,0,0,1*3B"); // Enable GPS+GALILEO+NAVIC
+
+            // Configure NMEA (sentences will output once per fix)
+            _serial_gps->write("$PAIR062,0,0*3F"); // GGA ON
+            _serial_gps->write("$PAIR062,1,0*3F"); // GLL OFF
+            _serial_gps->write("$PAIR062,2,1*3D"); // GSA ON
+            _serial_gps->write("$PAIR062,3,0*3D"); // GSV OFF
+            _serial_gps->write("$PAIR062,4,0*3B"); // RMC ON
+            _serial_gps->write("$PAIR062,5,0*3B"); // VTG OFF
+            _serial_gps->write("$PAIR062,6,1*39"); // ZDA ON
+
+            delay(250);
+            _serial_gps->write("$PAIR513*3D"); // save configuration
+
         } else if (gnssModel == GNSS_MODEL_UBLOX) {
             // Configure GNSS system to GPS+SBAS+GLONASS (Module may restart after this command)
             // We need set it because by default it is GPS only, and we want to use GLONASS too
@@ -1218,6 +1234,14 @@ GnssModel_t GPS::probe(int serialSpeed)
         return GNSS_MODEL_ATGM336H;
     }
 
+    /* Airoha (Mediatek) AG3335A/M/S, A3352Q, Quectel L89 2.0, SimCom SIM65M */
+    clearBuffer();
+    _serial_gps->write("PAIR020*38\r\n");
+    if (getACK("$PAIR020,AG3335", 500) == GNSS_RESPONSE_OK) {
+        LOG_INFO("Aioha AG3335 detected, using AG3335 Module\n");
+        return GNSS_MODEL_AG3335;
+    }
+
     // Get version information
     clearBuffer();
     _serial_gps->write("$PCAS06,0*1B\r\n");
diff --git a/src/gps/GPS.h b/src/gps/GPS.h
index 87d03c592..1c0977bdd 100644
--- a/src/gps/GPS.h
+++ b/src/gps/GPS.h
@@ -28,7 +28,8 @@ typedef enum {
     GNSS_MODEL_UBLOX,
     GNSS_MODEL_UC6580,
     GNSS_MODEL_UNKNOWN,
-    GNSS_MODEL_MTK_L76B
+    GNSS_MODEL_MTK_L76B,
+    GNSS_MODEL_AG3335
 } GnssModel_t;
 
 typedef enum {
@@ -302,4 +303,4 @@ class GPS : private concurrency::OSThread
 };
 
 extern GPS *gps;
-#endif // Exclude GPS
\ No newline at end of file
+#endif // Exclude GPS