I'm still not having any luck using the weak pull ups. I'm able to see the pins change states with my "O" scope, but no interrupt (at least not a dependable one). I also tried switching the IOCB to RB0:RB3 with the same disappointing results. I even went back to the microchip keypad configuration of...

Thanks bpislife, I think you're on to something. I'll give these ideas a try and let you know if I have any luck.

Thanks again,

daver442

That does work, but with keypad_released being a blocking function the pic won't be free to perform other tasks while waiting for keypad input. I really need the interrupt to detect that a keys been pressed.

Hi bpislife,

Thanks for the response. I tried your suggestion and I was able to generate the interrupt with and without the keypad_init command. Should all pins be pulled to ground for interrupt on change?

daver442

Hi folks! Having trouble getting RB<7:4> IOCB to work with keypad. I'm using P16F886 with 4X4 keypad wired up as in MB example (RB7:RB0 pulled to grnd using 10K resistors). Keypad functions properly when using code with Keypad_released function but I don't want the processor tied up all day waiting ...

Perhaps I'm making an incorrect assumption that they didn't work however, the only changes I made to get the lcd's to work are in bold text in my second post (PORTA = 0, TRISA = 0). I have since removed those changes and made the changes directly to the LCD4_INIT routine highlighted in my previous p...

Hi xor, Thanks for the response. I've modified the beginning of the LCD4_INIT routine as follows: sub procedure LCD4_INIT PORTA = PORTA And $FA TRISA = TRISA And $FA TRISC = TRISC And $0F delay10000(5) Everything is now working fine. My question is why didn't the individual port pin assignments orig...

Thanks for the response. I understand the part about setting the port pins as outputs, but what is the difference between setting the entire port as an output vs. just setting the pins I'm using as outputs. Setting the pins individually didn't work, setting the entire port did. I don't have a firm g...

I got it!! PORTA apparently wasn't being configured properly by the INIT routine in the optimized LCD4 module. Anyone know why? I changed my setup code to this: sub procedure setup() CM1CON0.7 = 0 ' turn off comparators CM2CON0.7 = 0 ' turn off comparators ANSEL = ANSEL and %1110000 ' turn off analo...

Hello all, I have 3 lcd character displays, 1-4X16, and 2-4X20's. I'm having trouble getting them to display with the MB lcd library and xor's optimized code. The 4X16 will display using the MB lcd (4 bit) library however display lines 3 and 4 are shifted over to mid display. The 2 4X20's will not d...

Found my mistake.....using the wrong interrupt flag. I must be dyslexic or something. Everything is working fine now. Thanks to everyone for the responses.

daver442

I'm still not having any luck. Anyone have any ideas? The frustration level is about at a 7.5!!!

Hello to all, and thanks for the responses. I apologize for the lack of pertinent info in my opening post. The output of CCP1 is toggling at a rate of approx 260ms (+/- as near as I can tell with my oscope). I've set timer1 (Fosc/4) prescaler at 1:8 using the 8Mhz internal clock. That should provide...

Can anyone please offer any guidance as to why I'm unable to change the duration of the pulse "on" and "off" times based on the code in the previous post?

Thanks.

Trying to build off code written by W. Schroeder that toggles CCP1 for a precision time period. Problem is I'm unable to affect the output based on changes to CCPR1H:CCPR1L register which should generate an interrupt when a match occurs with TMR1H:TMR1L (at least thats what I would like to have happ...