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Forum Index : Microcontroller and PC projects : MMBasic with input pins
| Author | Message | ||||
| B15HOP Newbie  Joined: 11/09/2015 Location: AustraliaPosts: 15 |
I'm back again. Now with a 2nd problem. My little Pic32 micromite is doing well. I seem to be having more trouble programming in MMBasic than I would in C. The issue is that I need to take input pins using SetPin xx, din, pulldown and write a function that takes say 5 pins and turns it into a number. ie SetPin 15, din, pulldown SetPin 16, din, pulldown SetPin 17, din, pulldown SetPin 18, din, pulldown SetPin 21, din, pulldown SetPin 22, din, pulldown SetPin 23, din, pulldown SetPin 24, din, pulldown The pins all collect either a 1 for on or 0 for off. How would I make it so that it makes a number with the binary inputs. Say I have switch 24, 23, and 22 on... and 18 on. So effectively that would be 00010111 ie binary for 23 in decimal. Then set it as a variable. I'm not sure how to convert strings or pins into a number. Do I just do it manually. Ie pin 24 adds 1, pin 23 adds 2, pin 22 adds 4, pin 21 adds 8 etc...? Or is there a more simple way? Cheers. |
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 8592 |
Do I just do it manually. Ie pin 24 adds 1, pin 23 adds 2, pin 22 adds 4, pin 21 adds 8 etc...? Or is there a more simple way?
The PORT function will do exactly what you want |
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| B15HOP Newbie Joined: 11/09/2015 Location: AustraliaPosts: 15 |
I'm using the port function already funny enough. But it's for writing dout to a 7seg. Does it read pins in as well? I'm just reading pins from two banks of 4x switches. |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
Many ways to do it. Using PORT is good if pins are in 'blocks' of sequential pins. If not then another way is (using your pin numbers): xx=pin(15)*128 xx=xx+pin(16)*64 xx=xx+pin(17)*32 xx=xx+pin(18)*16 xx=xx+pin(21)*8 xx=xx+pin(22)*4 xx=xx+pin(23)*2 xx=xx+pin(24) WW For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8592 |
These is a PORT command (output) and a PORT function (input). Look in the function section of the manual for details of the input version |
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| B15HOP Newbie Joined: 11/09/2015 Location: AustraliaPosts: 15 |
I did read that part in the manual but didn't quite understand it. [code] DIM INTEGER Init_Number = port(24,-4,18,-4) [/code] Bunching commands together doesn't always seem to work. Or doesn't it take negitive numbers? That will work, but I thought maybe there was a way to do it on one line of code. :) |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9066 |
I just use N=PORT(1,4) or N=PORT(1,4,61,4)(for the 64-pin MM+) The first example will read pin1,pin2,pin3 and pin4, and save the binary value of the combined pins in variable N, and the 2nd version will read an 8-bit binary number on pins 1-4 and pins 61-64 on the MM+, and save the value in N. You make reference to -4, which is illegal I think? EDIT: SetPin 15, din, pulldown SetPin 16, din, pulldown SetPin 17, din, pulldown SetPin 18, din, pulldown SetPin 21, din, pulldown SetPin 22, din, pulldown SetPin 23, din, pulldown SetPin 24, din, pulldown ...in your case would become: N=PORT(15,4,21,4) Variable 'N' will contain the value of all 8-bits of your two switch banks.  Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8592 |
Try: DIM INTEGER Init_Number = port(21,4,15,4) |
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| B15HOP Newbie Joined: 11/09/2015 Location: AustraliaPosts: 15 |
Yeah I just thought it could read the ports backwards but I guess not. Guess it doesn't matter if I flip the breadboard around to read them upside down. :) |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9066 |
Ahhhhh - I see what you mean by the -4 now. No, pins must be numbered consecutively to use the PORT function. I will watch this thread, and see if anyone comes up with a brilliant solution - someone usually does.   Smoke makes things work. When the smoke gets out, it stops! |
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| B15HOP Newbie Joined: 11/09/2015 Location: AustraliaPosts: 15 |
Both techniques definitely work. The function just can't take negitive values so Mr Wizzard's option is the solution for now. But I really do like having just one line of code. :) |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8592 |
You can go: DIM INTEGER Init_Number = port(24,1,23,1,22,1,18,1,17,1,16,1,15,1) or any other order to get what you want |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
xx=pin(15)*128 +pin(16)*64+pin(17)*32+pin(18)*16+pin(21)*8+pin(22)*4+pin(23)*2+pin(24)  For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| B15HOP Newbie Joined: 11/09/2015 Location: AustraliaPosts: 15 |
Cheers for your help guys. Appreciate it a lot. :) |
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