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el-3aba6i

Joined: 20 Sep 2018
Posts: 4

16f628a comparator configuration
Posted: Fri May 03, 2019 11:20 pm

I have one input changing in logic. When 5v input i want an interrupt to fire so that to reset a two seven segments with 4 bit decoders counter in port b.
Can anyone help me on configuring the comparator interrupt when input change to reset a counter and in the interrupt how to clear the flag so that it won't block on isr ?
I don't know how to match this code with the comparator mode. If anyone can give me comments on what each line does?
 Code: #define A0_A3_A1_A2  0xfff04 #define A0_A2_A1_A2  0x7ff03 #define NC_NC_A1_A2  0x6ff05 #define NC_NC_NC_NC  0x0ff07 #define A0_VR_A1_VR  0x3ff02 #define A3_VR_A2_VR  0xcff0A #define A0_A2_A1_A2_OUT_ON_A3_A4 0x7e706 #define A3_A2_A1_A2  0xeff09 #define CP1_INVERT   0x00010 #define CP2_INVERT   0x00020

Using ccs code and thanks.
PCM programmer

Joined: 06 Sep 2003
Posts: 20759

Posted: Fri May 03, 2019 11:56 pm

 Quote: #define A0_A2_A1_A2_OUT_ON_A3_A4 0x7e706

The constant consists of three bytes: 07 E7 06

1. CMCON is loaded with 0x06.

2. TRISA is bitwise OR'ed with 0x07.
This sets bits 0,1,2 = 1, which makes pins A0, A1, A2 into inputs.

3. TRISA is bitwise AND'ed with 0xE7.
This sets bits 3 and 4 = 0, which makes pins A3 and A4 into outputs.
el-3aba6i

Joined: 20 Sep 2018
Posts: 4

 Posted: Sat May 04, 2019 12:01 am Thanks for good explaning. I'm not using asm code but pic c compiler code. The code i pasted was from .h pic file. I didn't find any reference explaining it in pic c compiler code directly, all i find is mplab codes. What i need is the code to put in setup comparator() function and thanks. ;)
el-3aba6i

Joined: 20 Sep 2018
Posts: 4

Posted: Sat May 04, 2019 12:09 am

This is the setup i have done after your reply but int won't fire.
 Code: setup_comparator(A0_A2_A1_A2_OUT_ON_A3_A4);  enable_interrupts(GLOBAL); enable_interrupts(INT_COMP);
temtronic

Joined: 01 Jul 2010
Posts: 6806
Location: Greensville,Ontario

 Posted: Sat May 04, 2019 5:18 am You need to show us your complete program ! Jay
PCM programmer

Joined: 06 Sep 2003
Posts: 20759

Re: 16f628a comparator configuration
Posted: Sat May 04, 2019 4:08 pm

 el-3aba6i wrote: I have one input changing in logic.
Is this a push-button to ground, with a pull-up resistor on it ?

 el-3aba6i wrote: When 5v input i want an interrupt to fire so that to reset a two seven segments with 4 bit decoders counter in port b.

Why use the comparator to detect the input change ?
Why not make it easy and use the External Interrupt on Pin B0 ?
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