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Need help with i/o

 
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agompert



Joined: 14 Jan 2008
Posts: 5

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Need help with i/o
PostPosted: Tue Jan 15, 2008 11:49 am     Reply with quote

I just started C programing and am trying to input from portc and then
output to portb but it's not looping,

Please help

#include "C:\test\main.h"

void main()
{

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);

// TODO: USER CODE!!

set_tris_a(0xff); // set porta as inputs
set_tris_b(0x00); // set portb as outputs
set_tris_c(0xff); // set portc as inputs
output_b(0x00); // clear portb


{
input_c(); //
output_b(input_c()); //
}

}


Last edited by agompert on Tue Jan 15, 2008 12:38 pm; edited 5 times in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jan 15, 2008 12:00 pm     Reply with quote

Please use a title for topic that describes the problem, such as
Quote:
"Need help with i/o ports."

Don't just say "Need help".
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Tue Jan 15, 2008 12:17 pm     Reply with quote

The code is not 'looping' because there is no loop command.

You have the following loop commands in C:
- while
- for
- do / while
An explanation of these commands is out of the scope of this forum, any C book or online course will handle that.

The tris setting commands are not needed as the compiler will handle this for you on every call to input or output data to a port.

The main part of your code could then look like:
Code:
int8 port_value;

while (TRUE)
{
  port_value = input_c();
  output_b( port_value );
}
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