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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Thu Dec 14, 2006 5:00 pm |
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| Quote: | | what if I need input and output ? |
The demo program below shows how to read eight spare bits and pack
them into a byte variable.
You don't need to set the TRIS if you're running the compiler in Standard
i/o mode. The compiler will handle it, since I'm using CCS i/o functions
in the macro. ("Standard i/o" mode is the default mode of the compiler).
| Code: | #include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
// This macro reads the value of the following
// pins and packs the result into a single byte.
// RA0,RA1,RA4,RB2,RB5,RB7,RC0,RC5
#define read_spare_bits(x) \
x = 0; \
if(input(PIN_A0)) bit_set(x, 0); \
if(input(PIN_A1)) bit_set(x, 1); \
if(input(PIN_A4)) bit_set(x, 2); \
if(input(PIN_B2)) bit_set(x, 3); \
if(input(PIN_B5)) bit_set(x, 4); \
if(input(PIN_B7)) bit_set(x, 5); \
if(input(PIN_C0)) bit_set(x, 6); \
if(input(PIN_C5)) bit_set(x, 7);
//==================================
void main()
{
int8 result;
while(1)
{
// Read the value of the spare bits and put
// it into the 'result' variable.
read_spare_bits(result);
printf("Result = %X \n\r", result);
delay_ms(500);
}
} |
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Guest
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| Posted: Mon Jan 08, 2007 5:21 am |
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| I've just tried implementing the above macro set_spare_bits() and instead of turning on a static image on the 7-seg it cycles through the segments, one at a time, starting with one segment and then two, three, four, etc. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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