Post by thread:[SX] PWM -- SX/B Question

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, jecuzens wrote:So I've been trying to use some switching between an LED being full on and PWM and I'm running into some problems... The below code demonstrates what I'm seeing... ' BUG.SXB DEVICE SX28, OSC4MHZ, TURBO, STACKX, OPTIONX, BOR42 FREQ 4_000_000 Led PIN RC.7 OUTPUT increaseVal VAR BYTE PROGRAM Start Start: increaseVal = 0 DO IF increaseVal > 10 THEN Led = 1 ELSE PWM Led, 50, 2 ENDIF PAUSE 100 INC increaseVal LOOP The behaviour I expected was that for the first second the LED is PWM and then after that it is full on... What I am seeing is that the LED goes off after the first second of PWM???Why is this happening!?!

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:PWM is only generated during the PWM command. During the PAUSE 100 there is no PWM to the LED.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, jecuzens wrote:The problem isn't the lack of PWM during the PAUSE but that once the counter (increaseVal) becomes greater than 10 it should switch the LED on permanently... This doesn't happen! It turns the LED off???

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:The problem is that the PWM command leaves the LED pin in an input state -- change Led = 1 to HIGH Led.

From the help file PWM page: After outputting the PWM pulses, the SX leaves the pin in input mode... ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=305945#m305961 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, jecuzens wrote: [Quoting: "JonnyMac"]The problem is that the PWM command leaves the LED pin in an input state -- change Led = 1 to HIGH Led.From the help file PWM page: After outputting the PWM pulses, the SX leaves the pin in input mode... Sweet! Thanks! I was pulling my hair for a little bit there! Thanks for the help!

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