16f887 to 18f4685 transition


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  1. #12
    Join Date
    Dec 2010
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    Default Re: 16f887 to 18f4685 transition

    The code does compile 100% no errors, but it runs improperly. I am getting scrambled characters from the HSERIN/HSEROUT commands when the program is on the 18f4685, but when the program is on the 16f887 it works perfectly.

    Here is how I have the 16f887 initialized (I did not use any config settings here)

    Code:
    Define device 16F887
    Define OSC 8
    ANSEL=0 ' A/D disabled for ANS0 to ANS7
    ANSELH=0 ' A/D disabled for ANS8 to ANS13
    CM1CON0 = 0 ' Disable comparators
    CM2CON0 = 0 ' These default to disabled at POR, but just in case
    CM2CON1 = 0
    ADCON1 = 7
    IOCB = 0
    INTCON = 0
    
    DEFINE HSER_RCSTA 90h ' Enable Serial PORT
    DEFINE HSER_TXSTA 24h ' Enable transmit
    DEFINE HSER_SPBRG 129 ' set USART to 9600 baud (when BRGH=1)
    DEFINE HSER_CLROERR 1 ' Enable automatic overrun error
    DEFINE LOADER_USED 1
    and this is how the 18f4685 is initialized

    Code:
    define device 18f4685
    @ __CONFIG    _CONFIG1H, _OSC_IRCIO67_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
    @ __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
    @ __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
    @ __CONFIG    _CONFIG4L,  _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_1024_4L & _XINST_OFF_4L
    OSCTUNE = %11000000
    OSCCON = %01110000
    define OSC 8
    CMCON = 0
    ADCON0 = 7
    ADCON1 = 7
    ADRESH = %00000000
    ADRESL = %00000000
    INTCON = 0
    INTCON2 = 0
    INTCON3 = 0
    IPR1 = 0
    PIR1 = 0
    PIE1 = 0
    
    
    DEFINE HSER_RCSTA 90h ' Enable Serial PORT
    DEFINE HSER_TXSTA 24h ' Enable transmit
    DEFINE HSER_SPBRG 129 ' set USART to 9600 baud (when BRGH=1)
    DEFINE HSER_CLROERR 1 ' Enable automatic overrun error
    DEFINE LOADER_USED 1
    The rest of the program has remained unchanged.
    Last edited by emerson; - 21st July 2012 at 19:37.

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