can't save code ESP32 with i2C oLED

Hi all,

I am trying to save a simple code but it does not save.
I used this command on Windows terminal to flash the ESP32 wemos oled (attached pic) board:

esptool.py --chip esp32 --port COM3 --baud 921600 write_flash --flash_size=detect 0x1000 bootloader.bin 0x10000 espruino_esp32.bin 0x8000 partitions_espruino.bin
esptool.py v2.3.1
Connecting........_
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 12272 bytes to 7603...
Wrote 12272 bytes (7603 compressed) at 0x00001000 in 0.1 seconds (effective 1008.3 kbit/s)...
Hash of data verified.
Compressed 929184 bytes to 520002...
Wrote 929184 bytes (520002 compressed) at 0x00010000 in 8.5 seconds (effective 871.0 kbit/s)...
Hash of data verified.
Compressed 3072 bytes to 136...
Wrote 3072 bytes (136 compressed) at 0x00008000 in 0.0 seconds (effective 2063.6 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

The I used Eepruino web IDE on Windows changed the baud to setting to highest (115200)

When I connect to ESP32 I get this error message. However it seems to work fine.

rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun  8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0008,len:8
load:0x3fff0010,len:1932
ho 0 tail 12 room 4
load:0x40078000,len:10012
load:0x40080000,len:252
entry 0x40080034
ERROR: jswrap_wifi_restore: esp_wifi_connect: 10
Loading 2736 bytes from flash...
>

when I uploade the code I get this warning:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 1v96 (c) 2017 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>WARNING: jshI2CSetup: driver installed, sda: 5 sdl: 4 freq: 50000,
=undefined
> 

this is test code:

function start(){
g.clear();
g.drawString("test",0,0);
g.flip();
}

// I2C
I2C1.setup({scl:D4,sda:D5});
var g = require("SSD1306").connect(I2C1, start);

When I save() it does not save

>save()
=undefined
Compacting Flash...
Calculating Size...
Writing..
Compressed 80000 bytes to 6860
WARNING: jshI2CSetup: driver installed, sda: 5 sdl: 4 freq: 50000,
> 

I disconnect and then reconnect ESP32 board but nothing shows up on oLED.
Any insight?

Thanks very much.

1 Attachment

I tried this and then saved using save().
However, LCD shows some dots but no text

function start(){
g.clear();
g.drawString("test",0,0);
g.flip();
}


E.on('init', function() { 
// I2C
I2C1.setup({scl:D4,sda:D5});
var g = require("SSD1306").connect(I2C1, start);
});

@user88194 in your case the problem is var g in init - you're defining it locally, so g won't exist when used in start. Try:

var g;
function start(){
  g.clear();
  g.drawString("test",0,0);
  g.flip();
}
E.on('init', function() { 
  // I2C
  I2C1.setup({scl:D4,sda:D5});
  g = require("SSD1306").connect(I2C1, start);
});

That worked! Thank you for explaining the issue.