Updated some of the error handling and data sources for GPS

src/gps/gpsdata.rs

@@ -34,7 +34,7 @@ impl GpsData {
 
         // Format the nmea buffer into a usable string
         let nmea_raw = String::from_utf8(buf.to_owned())
-            .map_err(|_| GpsError::ReadError())?;
+            .map_err(|_| GpsError::ReadError()).unwrap_or_default();
         let nmea_vec: Vec<&str> = nmea_raw.split('$').collect();
 
         // Loop through each sentence and use the information to update GPS data
@@ -57,8 +57,6 @@ impl GpsData {
             // print decoded gps data to serial
             match nmea {
                 nmea_parser::ParsedMessage::Gga(gga) => {
-                    self.latitude = gga.latitude;
-                    self.longitude = gga.longitude;
                     self.altitude = gga.altitude;
                 }
                 nmea_parser::ParsedMessage::Gll(gll) => {

src/main.rs

@@ -68,7 +68,7 @@ fn main() -> Result<(), Error> {
     let interface = I2CDisplayInterface::new(i2c);
     let mut display = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0)
         .into_buffered_graphics_mode();
-    display.init().unwrap();
+    display.init().map_err(|err| Error::DisplayError(DisplayError::SetupError(err)))?;
 
     let raw: ImageRaw<BinaryColor> = ImageRaw::new(include_bytes!("./rust.raw"), 64);
     let im: Image<'_, _> = Image::new(&raw, Point::new(32, 0));