FTDI Community

General Category => Discussion - Software => Topic started by: lightcalamar on June 21, 2018, 05:26:44 PM

Title: A bug for PWM_HZ command?
Post by: lightcalamar on June 21, 2018, 05:26:44 PM

Hello, I am trying to modify the pulse width modulation (PWM) frequency. I have read the programming datasheet for FT81x guide from http://brtchip.com/wp-content/uploads/Support/Documentation/Programming_Guides/ICs/EVE/FT81X_Series_Programmer_Guide.pdf (http://brtchip.com/wp-content/uploads/Support/Documentation/Programming_Guides/ICs/EVE/FT81X_Series_Programmer_Guide.pdf)  on page 82;

Code: [Select]

These bits define the backlight PWM output frequency in HZ. The default is
250 Hz after reset. The valid frequency is from 250Hz to 10000Hz.

I try to change the default frequency to 10000Hz, but I do not see any change, this I want to do to decrease the noise generated by the backlight, it is modulated with the audio output.

It is possible to modify this frequency, with solfware, it is not possible. A bug?

Best regards. Tomás.

Title: Re: A bug for PWM_HZ command?
Post by: FTDI Community on June 25, 2018, 11:14:40 AM

Hello,

The REG_PWM_HZ register is to correct register to write to alter the frequency of the backlight.

Can you show me how you are writing the register within your code?

Best Regards,
FTDI Community