PWM on pic16f1825 issues - 1.pbp v2.60c bug found, fix shown, 2.CCP2 on ALT pin probl


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  1. #5
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    Feb 2011
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    Default Re: PWM on pic16f1825 issues - 1.pbp v2.60c bug found, fix shown, 2.CCP2 on ALT pin p

    Yup, Figured that out the other night.

    It's them config words and assuming the compiler is doing what you want not what it was told to do. : )

    posted the details on the Microchip site.
    http://www.microchip.com/forums/m570397.aspx

    ===========================
    I knew I just need to set another bit, well actually it was 3 bits.

    You know what happens when you assUme.

    Lesson learned:
    1. don't assume the config words are set correctly shock
    2. rtfm some more. LoL

    RA5 is also OSCIN & CLKIN

    Since the thing ran, I assumed the FOSC was set correctly by the compiler.

    configword1 FOSC<2:0> was = 010 needed to be 100

    bit 2-0 FOSC<2:0>: Oscillator Selection bits
    111 =ECH: External Clock, High-Power mode (4-32MHz): device clock supplied to CLKIN pin
    110 =ECM: External Clock, Medium-Power mode (0.5-4MHz): device clock supplied to CLKIN pin
    101 =ECL: External Clock, Low-Power mode (0-0.5MHz): device clock supplied to CLKIN pin
    100 =INTOSC oscillator: I/O function on CLKIN pin
    011 =EXTRC oscillator: External RC circuit connected to CLKIN pin
    010 =HS oscillator: High-speed crystal/resonator connected between OSC1 and OSC2 pins
    001 =XT oscillator: Crystal/resonator connected between OSC1 and OSC2 pins
    000 =LP oscillator: Low-power crystal connected between OSC1 and OSC2 pins

    Okay, so now I can use the layout for my PCB without cutting.
    PWM on the Backlight led will now work. mr green

    Board specs:
    1.5" x 1" prototyping area with a V+ & GND bus on the ends
    RS-232 both 5v & full +/-12v via DB9
    Use the PICkIT "PROG" connector to also talk to it via rs232-TTL uses RA3 (in) and RA0 (out)
    LCD connectors for both styles of HD44780 Modules -- 1x16 & 2x8 on 0.1 centers
    Laid out for the 14pin PIC to control the LCD so the remaining pins can be used for fun things. Even the 14pin Pic has 2 pins open.

    Thanks for the help!
    pcb schematic, layout and 3d by KICAD [free]
    top view
    PCB (c)2011 Ofuzzy1.com

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    Last edited by ofuzzy1; - 10th April 2011 at 08:48.

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