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el-3aba6i
Joined: 20 Sep 2018
Posts: 4
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| 16f628a comparator configuration |
 Posted: Fri May 03, 2019 11:20 pm |
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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
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Using ccs code and thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 03, 2019 11:56 pm |
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| 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. |
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el-3aba6i
Joined: 20 Sep 2018
Posts: 4
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| Posted: Sat May 04, 2019 12:01 am |
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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. ;) |
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el-3aba6i
Joined: 20 Sep 2018
Posts: 4
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| Posted: Sat May 04, 2019 12:09 am |
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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); |
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temtronic
Joined: 01 Jul 2010
Posts: 9245
Location: Greensville,Ontario
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| Posted: Sat May 04, 2019 5:18 am |
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You need to show us your complete program !
Jay |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Re: 16f628a comparator configuration |
| Posted: Sat May 04, 2019 4:08 pm |
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| el-3aba6i wrote: | I have one input changing in logic.
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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.
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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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