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16 Posts

Posted - 27 Feb 2002 :  14:13:29  Show Profile  Email Poster
Is it possible to control the contrast and the intensity of the backglight by software? (Bitsy board)

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1 Posts

Posted - 27 Feb 2002 :  14:36:48  Show Profile  Email Poster
Yes. Using the SIOBackLightPwm() and/or SIOBacklightVEEPwm() functions from the ADSmartIO library, you can programmatically adjust these levels.

Take a look at the ADSmartIO documentation for more detailed information.
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3 Posts

Posted - 21 May 2002 :  15:57:41  Show Profile  Email Poster
I am only getting a dc voltage on the BACKLIGHT PWM pin (Bitsy J3 pin 16) when using the SIOBackLightPwm() function. My backlight inverter requires a PWM signal not a dc voltage level. Is there a different function than the SIOBackLightPwm() that will give me the PWM signal or is it limited to a dc level voltage.
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1519 Posts

Posted - 21 May 2002 :  16:02:30  Show Profile  Email Poster
Hi Paul:

The PWM signal is filtered by a 1.2k resistor and 1uF capacitor. We can remove the capacitor if you only need raw PWM in your application. Drop us a line directly and let's see what makes sense.


Drew Kidder
ADS Technology Transfer
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