Re: [Gumstix-users] twl4030_madc twl4030_madc: conversion timeout!

[Keane, B. (STRX) <ben...@ka...>]

Hi,

Thanks for your suggestions.  It timesouts whether it's a fast moving signal or a fixed voltage signal. I read it every 100mS or so. I sample 4 ADC lines every 100ms. 

I have changed the timeout to 10mS and it is happening less - I will monitor and see how that goes.  I would rather a same to take longer than it to timeout.

Thanks,

Ben

-----Original Message-----
From: bhamadicharef [mailto:bha...@ho...] 
Sent: Thursday, 2 August 2012 12:26 AM
To: gum...@li...
Subject: Re: [Gumstix-users] twl4030_madc twl4030_madc: conversion timeout!

If you look at the source at
http://lxr.free-electrons.com/source/drivers/mfd/twl4030-madc.c?v=3.3;a=arm
in the function static int twl4030_madc_wait_conversion_ready (line 472) there seems to be some time out in ms (set to 5 ms at line 582) ... pretty ok for most situation I think. 

Which input do you measure ?  What sort of signal, bandwidth / dynamic level ?
How often do you read it ? Is your call threaded or by a timer ? 

I am using Sakoman R13 Gnome (3.0.0) and do not have any issues, although I am measuring a very stable signal (voltage divider with potentiometer and multiple switches configured as joystick).

Brahim 




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