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[SOLVED] Query all states of I/O pins...

 
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ELCouz



Joined: 18 Jul 2007
Posts: 427
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[SOLVED] Query all states of I/O pins...
PostPosted: Fri Dec 11, 2015 5:02 pm     Reply with quote

Hi,

Is a better way to know pins status than input_state(PIN_A1)...input_state(PIN_A2)...etc

I want to make a small debug code that write all the current states of I/O pins on UART.

thanks!
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Regards,
Laurent

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Here's my first visual theme for the CCS C Compiler. Enjoy!


Last edited by ELCouz on Sat Dec 12, 2015 3:31 pm; edited 1 time in total
temtronic



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PostPosted: Fri Dec 11, 2015 7:53 pm     Reply with quote

My first try would be to dump a listing of a small program to see how CCS does it per pin then decide if you could go 'port by port' with a similar strategy.
Currently trying how to repair a busted 40' truss and put the rockshaft onto my #1 tractor at the same time....so PIC time is very very little...

sigh
PCM programmer



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PostPosted: Fri Dec 11, 2015 8:01 pm     Reply with quote

CCS doesn't have an input_state_x() function. You can make one for
each port as shown below. Or you can skip the function and just read
directly from each Portx register.
Code:

// This function reads Port B without changing the TRIS.
int8 input_state_b(void)
{
#byte PortB = getenv("SFR:PORTB") 

return(PortB);
}
Ttelmah



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PostPosted: Sat Dec 12, 2015 2:22 am     Reply with quote

Add (of course), that if you have fast_io enabled, then the CCS input_b function, will give the input state of the whole port.....
temtronic



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PostPosted: Sat Dec 12, 2015 5:50 am     Reply with quote

hmm my mind is elsewhere..... I was thinking he needed to know which pins were set for inputs vs outputs.

Jay
ELCouz



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PostPosted: Sat Dec 12, 2015 8:22 am     Reply with quote

Thanks guys!

What about partial query of a port?


Let's say I have some defines like this:

Code:


#define LED1 PIN_A0
#define LED2 PIN_A6
#define LED3 PIN_B2
#define LED4 PIN_C3


//and I want to query the status of those pins.

for (i=1;i<=4;++i)
   {
   printf("%u\r\n",input_state(LEDS+i));
   }

// how its possible to cycle through LEDS1 to LEDS4 defines?



I tried google-ing "increment define loop" or "increment variable name" of course it only showed how to i++ a variable value on CCS.

Thanks again guys!
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
temtronic



Joined: 01 Jul 2010
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PostPosted: Sat Dec 12, 2015 11:07 am     Reply with quote

you're making it far to complicated,go back to KISS principle....

just create a function that contains...


//
printf("%u\r\n",input_state(LED1));
printf("%u\r\n",input_state(LED2));
printf("%u\r\n",input_state(LED3));
printf("%u\r\n",input_state(LED4));
//

.....
far simpler to implement,
easier to understand,
quick to edit to add a pin or two...
probably FASTER than any 'higher level' coding as well....


Jay
Ttelmah



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PostPosted: Sat Dec 12, 2015 11:23 am     Reply with quote

and also worth understanding that the 'single pin' version is solved at compile time, and will only use one or two instructions. One involving using a variable, will have to split the variable up into port and pin number, then do indexed I/O to access the port, then use a variable to access the pin. Literally dozens of instructions.....
ELCouz



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PostPosted: Sat Dec 12, 2015 12:02 pm     Reply with quote

temtronic wrote:
you're making it far to complicated,go back to KISS principle....

just create a function that contains...


//
printf("%u\r\n",input_state(LED1));
printf("%u\r\n",input_state(LED2));
printf("%u\r\n",input_state(LED3));
printf("%u\r\n",input_state(LED4));
//

.....
far simpler to implement,
easier to understand,
quick to edit to add a pin or two...
probably FASTER than any 'higher level' coding as well....


Jay


It was just a quick example with leds to understand... but I have more than 30 readings to take and they are not sequential (spanned across multiple ports)!

I just wanted to see if there was a cleaner way than copy pasting 30 lines of repeatable code Smile


Thanks for the clarification guys!
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
Ttelmah



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PostPosted: Sat Dec 12, 2015 3:25 pm     Reply with quote

As a comment though, think again.
If you are reading various bits from multiple ports, just read all the ports directly, using code like PCM_programmer has given, and store/print these. Even the biggest chips only have a handful of ports....
ELCouz



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Posts: 427
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PostPosted: Sat Dec 12, 2015 3:30 pm     Reply with quote

Ttelmah wrote:
As a comment though, think again.
If you are reading various bits from multiple ports, just read all the ports directly, using code like PCM_programmer has given, and store/print these. Even the biggest chips only have a handful of ports....


I misread the PCM programmer comment in code

Quote:
This function reads Port B without changing the TRIS.


I was afraid it will change the state of the pins (like input)...

Turns out its just fine!

Sorry my bad! Thanks all of you guys Smile

Case closed Very Happy
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
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