Input: Adafruit Ultimate GPS (TinyGPS++) Output: 1.5" SPI OLED display (U8G2) Processor: Teensy LC

My sketch basically report ( nbr sats, direction, altitude, course to home, distance to home). If I never issue the U8G2 "Send Buffer", TinyGPS shows/updates (Serial.print), as an example, 'direction'. Once I issue the "SendBuffer", TinyGPS always returns zero.

`// Date Written: May 5,2019 // Author: Dave Garner // Base code is from Yvan @ https://Brainy-Bits.com // Processor: Teensy LC // Input Adafruit Ultimate GPS // Output: 1.5" SPI OLED display

// This code resides in my '36 Chevy Street rod and is used to display the following // information on a 1.5" OLED display mounted above the interior rear view mirror.

// Direction of travel // Elevation // Direction and distance to my home.

u8g2

include

include <TinyGPS++.h>

TinyGPSPlus gps;

char CSats[3] ="00"; char CAlt[5]; char CDis[5]; char CAngle[4] ="xxx"; long IAngle ; long IAlt; const char *cardinalHeading ; int StringPixilLength ; char HomeString[10];

// static const double Home_LAT = 38.896565, Home_LON = -121.07689; // test (Aubrun CA)

static const double Home_LAT = 38.652807, Home_LON = -121.153539; // my home location

// U8g2 Library SPI, Software Serial, Full Frame Buffer mode

// rotation, clock, data, cs, dc [, reset]) U8G2_SSD1327_MIDAS_128X128_F_4W_SW_SPI u8g2(U8G2_R0 , 5, 6, 4, 3 , 2) ;

void setup() { Serial.begin(9600); Serial.println("---- Fire this Baby up! 2------"); Serial1.begin(9600);

u8g2.begin();
u8g2.setContrast(200); // 0 to 255 // delay (5000) ;

} void loop() { //---------------------------------------- Grab and format the satellite info -----------------------------
// Serial.print("Serial1.available() "); Serial.println(Serial1.available()); while (Serial1.available()) gps.encode(Serial1.read()); //---------------------------------------- Wait till there are at least 4 sats ----------------------------- / if (gps.satellites.value() < 4) { sprintf(CSats, "%02lu",gps.satellites.value()); // Serial.print("satellites.value--"); Serial.println(CSats);
u8g2.clearBuffer(); u8g2.setFont(u8g2_font_fub14_tr); u8g2.drawStr(00, 30, CSats); u8g2.setFont(u8g2_font_fub25_tr); u8g2.drawStr(10, 100, "No Fix!");
u8g2.sendBuffer(); } else //---------------------------------------- Got 4+?, grab 'em -----------------------------
{ / if (gps.satellites.value() > 4 ) {
sprintf(CSats, "%02lu",gps.satellites.value()); Serial.print("satellites.value--"); Serial.println(CSats);
//---------------------------------------- Grab current heading -----------------------------

 IAngle = gps.course.deg();
  itoa(IAngle,CAngle,10) ;
 Serial.println(CAngle);
const char *cardinalHeading =  TinyGPSPlus::cardinal(gps.course.deg());

Serial.println(cardinalHeading);

//---------------------------------------- Grab current elevation -----------------------------
IAlt = gps.altitude.feet();

itoa(IAlt,CAlt,10) ;

//---------------------------------------- Grab distance, course to "home" -----------------------------
unsigned long distanceKmToHome = (unsigned long)TinyGPSPlus::distanceBetween( gps.location.lat(), gps.location.lng(), Home_LAT, Home_LON) / 1000; distanceKmToHome = distanceKmToHome * 0.621371;
itoa(distanceKmToHome,CDis,10) ;

 double courseToHome =
  TinyGPSPlus::courseTo(
  gps.location.lat(),
  gps.location.lng(),
  Home_LAT, 
  Home_LON);

//---------------------------------------- Format the OLED Display -----------------------------

u8g2.clearBuffer();

//----------------------------------------- number of satellites ----------------------------
u8g2.setFont(u8g2_font_fub14_tr);
u8g2.drawStr(00, 35, CSats);
u8g2.drawStr(99, 35, CAngle); u8g2.sendBuffer();
}

}

mikalhart / TinyGPSPlus

Tinygps reports 'course' correctly until I execute a "U8G2" "Send Buffer" #59

include // U8g2 Library for Oled https://github.com/olikraus/u8g2

include

include <TinyGPS++.h>