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Easiest way to recombine a 16 bit binary value

 
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lsudigitalguy
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Easiest way to recombine a 16 bit binary value
PostPosted: Wed Oct 01, 2008 3:34 pm     Reply with quote
Hello,

I am using a PIC16C65. I have a 16 bit binary value coming into the chip through two 8 bit ports. I was wondering on the easiest way to recombine the two 8 bit values into a 16 bit value.


EX: value = A55Ah

port 1 = A5h;
port 2 = 5Ah;

variable = A55Ah
ckielstra



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

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PostPosted: Wed Oct 01, 2008 3:50 pm     Reply with quote
Use make16(), a union or shift/AND operations.

Make16 example:
Code:
int16 MyVar;

MyVar = make16( input_A(), input_B() );


For a description of the difference between the three methods and a union example see Ttelmah's post in http://www.ccsinfo.com/forum/viewtopic.php?t=30416
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Wed Oct 01, 2008 4:53 pm     Reply with quote
or you may not have to do anything, if there on consecutive ports and in the right order.
Code:
#define FIRM_MAJOR 'C'
#define FIRM_MINOR  05
#define HARD_MAJOR  3
#define HARD_MINOR  03
#include <18F4525.h>
#use delay(clock=10000000, restart_wdt)
#fuses hs,nowdt,noprotect,nolvp,put
#use rs232(baud=19200,xmit=PIN_C0,invert,stream=DEBUG) // stderr(same as debug)
#use rs232(baud=19200,enable=PIN_C5,xmit=PIN_C6,rcv=PIN_C7,stream=CIM)  // rs485 is the default
#case
#zero_ram

int16 my_int16;
#byte my_int16  = 0xF80 //note: no semicolin    0xF80= port A0 on a 18F4525
//                        sencond byte comes from 0xF81 which is port B on a 18F4525

//=== MAIN ===//
void main(void)
{
  setup_adc_ports(NO_ANALOGS);
  setup_adc(ADC_OFF);
  set_tris_a(0xFF);set_tris_e(0xFF);set_tris_c(0xFF);
  set_tris_b(0xFF);set_tris_d(0xFF);port_b_pullups(TRUE);

  fprintf(DEBUG,"%lu\n\r",my_int16);

  while(1)
  {
  }
}
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