PWM and WDT resets

[espruino-discuss]

Posted at 2016-01-09 by jnewcomb

Hi, can anyone give the current state of play with PWM functions with espruin­o_1v84.tve_master_d8dec28_esp8266?
Intro states it's not yet implemented, but see code in github
https://github.com/espruino/Espruino/blob/master/targets/esp8266/jshardware.c
jshPinAnalogOutput

So I've been playing - trying getting it working. Im getting WDT timeouts when ever I call 'analogWrite' in any of its forms

analogWrite(D4, 0.5);
=undefined

Working with Web IDE so the following message gets sent to the UART

 ets Jan  8 2013,rst cause:4, boot mode:(3,3)
wdt reset
load 0x40100000, len 1396, room 16
tail 4
chksum 0x89
load 0x3ffe8000, len 776, room 4
tail 4
chksum 0xe8
load 0x3ffe8308, len 540, room 4
tail 8
chksum 0xc0
csum 0xc0
2nd boot version : 1.4(b1)
  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

Tried a number of combinations:
Tried pin D14 too

D4.mode('af_output');
analogWrite(D4, 0.5,{freq:10});
D4.mode('output');
analogWrite(D4, 0.5,{freq:10});
analogWrite(D4, 0.5,{freq:100, soft:true});
analogWrite(D4, 0.5);

PS
Great project and fun to play with..

[espruino-discuss]

Posted at 2016-01-10 by tve

Hardware PWM doesn't work. The person who added the code didn't get it to work and I haven't looked at it, so I can't really tell you why it's not working. Have you tried the software PWM?

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Posted at 2016-01-11 by jnewcomb

Hi, I can't get the software PWM to work either. I get a WDT reset if any call is made to analogWrite(..)

>D4.mode('output'); =undefined >analogWrite(D4, 0.1, {soft:true}); =undefined > Disconnected >

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Posted at 2016-01-13 by @gfwilliams

Looking at it, there is no software PWM at the moment. It just needs a few lines copying over from the STM32 port - it could probably just do soft PWM for everything (whether requested or not)

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Posted at 2016-01-13 by @gfwilliams

@tve check this out - should be pretty easy to apply to ESP8266?

espruino/Espruino@a08421a