At 04:56 PM 10/11/02 -0700, you wrote:
>what do you mean by '-100%'?  I thought the duty cycle was 0% to 100%.

Sounds like he's doing reverse on an ESC.  Think H-bridge with PWM on +
side going to one bottom of the H, and on the - side going to the other
side of the H bottom.

The easy way is to use a table lookup.

Andy

>Thanks,
>Doug Hewett
>Software engineer
>StarTrac, Inc.
>
>
>-----Original Message-----
>From: ELLIOTT,TONY (HP-Roseville,ex1) [mailto:tony_elliott@HP.COM]
>Sent: Friday, October 11, 2002 4:28 PM
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC]:Exponential function on PWM output
>
>
>I need to create an exponential function, programmable between -100% to 0%
>to +100% in steps of 12.5%, on a PWM output. The driver is a non-exponential
>PWM signal input that the output should track either directly or
>exponentially depending on value programmed. Pulse width variation is 0.75ms
>to 2.25ms, period = 20ms. I am new to programming PIC's and would be
>grateful for help. Have searched archives and could not find applicable
>material. Thanks
>
>
>Tony Elliott
>Engineering Program Manager
>PC Customization Services
>Hewlett-Packard Company
>
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