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Does the ide know what board it is connect to? Can this be used for a preferential baud rate - default to 9600 unless the board.py specifies something different?

I guess it's a catch 22 situation here... Would about using the last board connected setting?

@tve could the ota server for firmware updates get extended to allow for the save() code to be be replaced for these lock up situations?

There would also be another benefit - could new code be sent along with the .bin files, to get interpreted on restart after the firmware update?

@gordon, I've been using the date constructor and splitting on spaces to format the hh:mm:ss part for a count down timer, and have discovered that if the the time is negative, you end up with a - sign instead of a leading 0.

I supply sample code if this makes it more clear....

The 115200 speed is good for me - especially if you add a few models that need to be uploaded.

The issue I'm aware of is after a firmware update. There is also the option of connecting the esp8266 to your wifi network, and using wiflash {ip-address}:88 to flash the firmware or adding the ip to the communications part of the web ide to avoid these issues.

Nice! Great write up. Should it moved to tutorials section?

Output a process.memory() in the loop and see if the jsvars drop.

Isn't this a recursive call that will call itself until all memory is consumed?

(function lo(op){
    console.log(incInput());
    return sleep(5, function(){
      return lo(op);

@hansamann
Are you on windows? I found that after a serial flash of a new firmware, you sometimes need to unplug the USB and plug back in again. The on connect form the web console it comes back up.

Have you seen this?

https://www.npmjs.com/package/node-espruino

Also,
If you are using the esp8266 board, you can use the wiflash.sh script to flash firmware over wifi, no need for a serial connection.

Well the new kid on the block will be the esp32 - the dual core version of the esp8266 with more ram and Bluetooth and wifi... So:
ESPruino32

My take on things :-)

https://gitter.im/espruino/Espruino

The gitter.im is a chat room - you'll need a github login to access.

The forum is less formal and for discussions, and espruino JavaScript type questions.

GitHub - two parts the espruino build, and espruino docs. This is more the engine room behind the code, although the docs in github end up as the reference part of the espruino.com/reference site....

ESPruino8266?

Thanks @Ducky - I'll give your pin assignments a go.

Thanks. I have that a go - however still a blank screen. I'm unsure in the nodemcu board the upper tx and rd are D8 and D9.

I might have to pull the one wire and led stuff I have on lower pins and try that next.

Has anyone managed to use the esp8266 to drive a graphics display?

I'm confused on how the nodemcu.D? pin outs correspond to the sp1 labeled on the board, and which pins are free to use - I know that nodemcu.D4 is the serial debug, so pins D5 upwards are ok, but unsure on how these map.

A fritzing diagram or similar would be appreciated!

So far I have:

SPI1.setup({ sck:NodeMCU.D8, mosi:NodeMCU.D7 });

var g = require("PCD8544").connect(SPI1, NodeMCU.D7 /*DC*/, NodeMCU.D8 /*CE*/, NodeMCU.D9 /*RST*/, function() {
  g.clear();
  g.drawString("Hello",0,0);
  g.drawLine(0,10,84,10);
  g.flip();
});

 RST   Brown  D9?
 CE    red    D8?
 DC    orange D7
 DIN   yellow D6  MOSI  
 CLK   green  D5  
 VCC   blue   +
 LIGHT purple  GND
 GND   grey    GND

Thanks

Or you could look at the vector fonts....

You should be able to look at the http status code, 200 is ok, anything in the 400 or 500 range is an error.

If you post your code as an example suggestions can be made.

This works:

import sys;

print ("-BESP8266_BOARD" in sys.argv)

python scripts/build_jswrapper.py src/jswrap_array.c src/jswrap_arraybuffer.c src/jswrap_date.c src/jswrap_error.c src/jswrap_espruino.c src/jswrap_flash.c src/jswrap_functions.c src/jswrap_interactive.c src/jswrap_io.c src/jswrap_json.c src/jswrap_modules.c src/jswrap_pin.c src/jswrap_number.c src/jswrap_object.c src/jswrap_onewire.c src/jswrap_pipe.c src/jswrap_process.c src/jswrap_serial.c src/jswrap_spi_i2c.c src/jswrap_stream.c src/jswrap_string.c src/jswrap_waveform.c libs/math/jswrap_math.c libs/network/jswrap_net.c libs/network/http/jswrap_http.c libs/network/js/jswrap_jsnetwork.c libs/network/esp8266/jswrap_esp8266_network.c targets/esp8266/jswrap_esp8266.c targets/esp8266/jswrap_nodemcu.c libs/network/telnet/jswrap_telnet.c libs/crypto/jswrap_crypto.c -DGIT_COMMIT=682807245a4f21ffc5fd48502d84c22e23194ffd -DBUILDNUMBER="41" -DUSE_DEBUGGER -DUSE_TAB_COMPLETE -DUSE_HEATSHRINK -DUSE_MATH -DUSE_NET -DUSE_ESP8266 -DUSE_TELNET -DUSE_CRYPTO -DUSE_OPTIMIZE_PRINTF -D__ETS__ -DICACHE_FLASH -DXTENSA -DUSE_US_TIMER -DEMBEDDED -DESP8266 -BESP8266_BOARD

Reading up on the getopt module....

Hi,
I want to generate conditional code for the ESP8266 in build_wrapper.py:151

if board == 'ESP8266'
 codeOut("static JswSymPtr jswSymbols_"+codeName+"[] __attribute__((section(\".irom.literal\"))) __attribute__((aligned(4))) = {\n  "+",\n  ".join(listSymbols)+"\n};");
else
   codeOut("static const JswSymPtr jswSymbols_"+codeName+"[] = {\n  "+",\n  ".join(listSymbols)+"\n};");

If unsure how to read the command line args and what the board test string would be.

if board == 'ESP8266'

at the moment there doesn't appear to be any conditional board code?

Are you on Windows? Sometimes I find after flashing you need to unplug the USB port and plug back in again.

After a flash, I usually have to do a few connect/disconnects in the ide as well.

Oh... And the latest builds allow you to use the 1mb above the firmware...

Take a look here:

http://forum.espruino.com/conversations/283045/#comment12837928

This stores page content in flash, and uses the .pipe to stream the content out on demand.

You can store the content on your gist, fetch into flash. Then your code above can pull the content from flash.

Edit: as gist requires https:// access you can use the wget to get this content. I have used a local node server to cache code.

Do you know what the i2c address for the device is? If you scan the i2c bus does it show up?

I would suggest using the web ide and get things working, and then move to your setup will be the quicker path!

The web idea is very interactive and allows quick prototyping.