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16f628a comparator configuration

 
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el-3aba6i



Joined: 20 Sep 2018
Posts: 4

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16f628a comparator configuration
PostPosted: Fri May 03, 2019 11:20 pm     Reply with quote

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

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PostPosted: Fri May 03, 2019 11:56 pm     Reply with quote

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

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PostPosted: Sat May 04, 2019 12:01 am     Reply with quote

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

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PostPosted: Sat May 04, 2019 12:09 am     Reply with quote

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
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Location: Greensville,Ontario

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PostPosted: Sat May 04, 2019 5:18 am     Reply with quote

You need to show us your complete program !
Jay
PCM programmer



Joined: 06 Sep 2003
Posts: 20759

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Re: 16f628a comparator configuration
PostPosted: Sat May 04, 2019 4:08 pm     Reply with quote

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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