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62 lines
1.3 KiB
62 lines
1.3 KiB
15 years ago
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/* global variables */
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char a;
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bit b1, b2;
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/* assign names to port pins */
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bit in @ PORTB.0;
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bit out @ PORTB.1;
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void sub( void)
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{
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char i; /* a local variable */
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/* generate 20 pulses */
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for ( i = 0; i < 20; i++) {
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out = 1;
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nop();
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out = 0;
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}
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}
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void main( void)
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{
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// if (TO == 1 && PD == 1 /* power up */) {
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// WARM_RESET:
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// clearRAM(); // clear all RAM
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// }
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/* NOTE 1: some devices have a comparator module
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that have to be switched off to use certain
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pins as digital IO */
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//CMCON = 0x07; // switch comparators off
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/* NOTE 2: devices having AD converter may need to
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configure the pins assigned to 'in' and 'out' as
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digital IO */
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//ADCON1 = ..
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/* First decide the initial output level on the
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output port pins, and then define the input/
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output configuration. This avoids spikes at the
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output pins. */
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PORTB = 0b.0000.0010; /* out = 1 */
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TRISB = 0b.1111.0001; /* xxxx 0001 */
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a = 9; /* value assigned to global variable */
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do {
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if (in == 0) /* stop if 'in' is low */
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break;
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sub();
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} while ( -- a > 0); /* 9 iterations */
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// if (some condition)
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// goto WARM_RESET;
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/* main is terminated by a SLEEP instruction */
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}
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