I2C and softwareserial

Question

Attempting to make gps unit with screen. GPS unit communicates over serial (Adafruit Ultimate GPS Breakout) and I can get GPS data through USB to my pc with Adafruit GPS library softwareserial examples. The screen communicates over I2C (Sunfounder OLED-SSD1306 Module) and I can get display with Adafruit SSD1306 examples. However I cannot get both to happen simultaneously. Board is Adafruit Metro Mini 5v 16MHZ. GPS is using pin 8 for TX and pin 9 for RX. Display is using A4 for SDA and A5 for SCL.

If "Adafruit_GPS GPS(&mySerial);" is not commented the screen will not display anything. If it is commented the screen displays just fine. How do I get both to function simultaneously?

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET -1
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); 
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(8, 9);
Adafruit_GPS GPS(&mySerial);
void setup() {
 if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
 for(;;);
 }
 display.display();
 delay(2000);
 display.clearDisplay();
 display.drawPixel(10, 10, SSD1306_WHITE);
 display.display();
 delay(2000);
 testdrawchar();
}
void loop() {
}
void testdrawchar(void) {
 display.clearDisplay();
 display.setTextSize(1); 
 display.setTextColor(SSD1306_WHITE); 
 display.setCursor(0, 0); 
 display.cp437(true); 
 for(int16_t i=0; i<256; i++) {
 if(i == '\n') display.write(' ');
 else display.write(i);
 }
 display.display();
 delay(2000);
}

• Juraj: I guess, you run out of memory

Answer 1

The problem was indeed running out of memory (as suggested by Juraj). After finding smaller libraries I was able to get it to work together just fine.

• n1nja: This is an incomplete answer. What libraries were chosen?
• Rob: Final list of libraries: #include <AltSoftSerial.h> #include <TinyGPS.h> #include <SoftwareSerial.h> #include "SSD1306Ascii.h" #include "SSD1306AsciiAvrI2c.h" #include <Wire.h> All of the Adafruit libraries were too large, so they all got switched out for more concise, compact libraries that fit my purposes