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@ceremcem try to type reset() even without prompt or erase flash and flash again

@Wilberforce

https://github.com/espruino/EspruinoDocs­/blob/master/devices/DHT22.js#L45

replace 6 with 30 and test again

@bigplik Yes - check http://forum.espruino.com/conversations/­286554/#comment12977481

I set the timeout to 30us and it works !

quoting the datasheet:

Data-bus's free status is high voltage level. When communication between MCU and DHT22 begin, program of MCU will transform data-bus's voltage level from high to low level and this process must beyond at least 1ms to ensure DHT22 could detect MCU's signal, then MCU will wait 20-40usfor DHT22's response.

by default PICO does 100KHz and ESP8266 does about 100KHz (80MHz) and 250kHz (160MHZ)

@Frida please try again on PICO and use setup option bitrate:50000 and without Wait()

Do not use bitrate option on ESP, I will reboot ......

and the problem went away. Now we have a new problem of lwip:

https://github.com/espruino/Espruino/blo­b/master/README_Building.md#for-esp8266

I was hoping I could use JsError as in the file jshardware.c, where the call come from, maybe someone has a solution.

you can't use JsError in i2c_master.c

use os_printf() or os_printf_plus(), both write to debug log

than use ESP8266.setLog(2); in the js code to switch debug log to uart0 (console)

I guess that value for ESP8266_SDK_ROOT is not correct.

ls -l /home/ceremcem/embedded/ESP8266_RTOS_SDK­/include/user_interface.h

I guess you use the WEBIDE and upload your code, so the time between writeTo and readFrom is different.

To make it equivalent put your code in a function and use setTimeout() to call it.

eg:

I2C1.setup({ sda: D4, SCL: D5 });

function i2c_do(i2c,addr, w,r){
    i2c.writeTo(addr, w);
    i2c.readFrom(addr,r);
}

setTimeout(function(){i2c_do(I2C1,0x11,0­,2);},1000);

ups - ok - adding that missing #define and C back to D

Now it compiles without errors

attached the version including your changes and printf()

Frida - Thanks for sharing your work !

typo : i2c_master_getDD -> i2c_master_getDC ?

compiles ;-)

using printf - remove \ infront of #define - line was not displayed correct without

// insert after last [#include](https://forum.espruino.com/se­arch/?q=%23include)
extern int os_printf_plus(const char *format, ...)  __attribute__((format(printf, 1, 2)));
\#define printf os_printf_plus

.......

error:
  i2c_master_stop();
  //jsError("> I2C streching too long\n");
  printf("> I2C streching too long\n");
  return -1; 
}

compile output:

targets/esp8266/i2c_master.c: In function 'i2c_master_readByte':
targets/esp8266/i2c_master.c:330:9: error: implicit declaration of function 'i2c_master_getDD' [-Werror=implicit-function-declaration]
         while ( i2c_master_getDD()==0 && count--) { // PB 36000/1000*4=144
         ^
targets/esp8266/i2c_master.c: At top level:

• MLX90614 INFRA RED THERMOMETER

• comes with integrated 4.7k pullups

• using snippets from module 'MLX90614'

please try

#include "jsutils.h"

./src/jsutils.h
void jsError(const char *fmt, ...);

NO - lots of compile errors ......

There are some implementation for clock stretching, eg: core_esp8266_si2c.c

and Frida posted, that she has implemented clock stretching http://forum.espruino.com/comments/12973­407/

@Frida - wow, can you please share the clock stretching code ?

@Wilberforce added board and pins - thanks for that hint

Monochrome 128x32 I2C OLED graphic display, adafruit PRODUCT ID: 931

o comes with integrated 4.7k pull-ups

o module SSD1306

o ESP8266-12E&F

o D4 - SDA and D5 - SCL

works without problems

Like to use this post to build up a list of tested i2c devices on ESP8266

please fell free to add devices - thanks.

@tve - thanks
....

• does not support clock stretching (a method by which slaves can slow down the master)
  
  

....

will check this with a logic analyzer

start investigating the source code

Tried i2cdetect code with a OLED attached at address 0x3c and limit scan to 0x30-0x3f

Get fussy read results for adr <> 0x3c and lots of ERROR: No ACK

o no error for 0x3c - read value 65
o no catch was triggered

>echo(0);
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:
10:
20:
ERROR: No ACK
30:136
ERROR: No ACK
31:168
ERROR: No ACK
32:248
ERROR: No ACK
33:24
ERROR: No ACK
34:184
ERROR: No ACK
35:56
ERROR: No ACK
36:72
ERROR: No ACK
37:56
ERROR: No ACK
38:248
ERROR: No ACK
39:72
ERROR: No ACK
3a:40
ERROR: No ACK
3b:200
3c:65
ERROR: No ACK
3d:88
ERROR: No ACK
3e:136
ERROR: No ACK
3f:24
30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
40:
50:
60:
70:
=undefined

The I2C test with an oled is only using i2c.writeTo().

Will do some tests with a I2C device that use i2c.readFrom().

@Ollie This is no official release - just a travis build with the latest commit - so you are on you own !

espruino_esp8266_user1.bin 29-Apr-2016 10:17 450K

and this is it :

 ____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v85 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 4MB:512/512, manuf 0xe0 chip 0x4016
>process.memory();
={ "free": 1678, "usage": 22, "total": 1700, "history": 0 }
>require("ESP8266").getState()
={
  "sdkVersion": "1.5.0",
  "cpuFrequency": 160, "freeHeap": 10160, "maxCon": 10,
  "flashMap": "4MB:512/512",
  "flashKB": 4096,
  "flashChip": "0xe0 0x4016"
 }
> 

@AlexOwen

from 1200 to 1400 jsvars on the ESP8266

some ESPs at my side are running with 1v85.MaBe_master_db6edcd ( latest pull )
with 1700 vars, 10.000 heap, GRAPHICS and CRYPTO

(in plain text unfortunately)

crypto is now included

but it won't survive a reboot.

use Wifi.save()

a bug in the code or the hardware misbehaving ....

Will run some test on 1v85 to clarify that AP is working as needed.