Example Programs
delay_ms(11);
}
byte read_ext_eeprom(EEPROM_ADDRESS address) {
byte cmd[3];
byte i, data;
cmd[0]=0;
cmd[1]=address;
cmd[2]=0xc;
for(i=1;i<=4;++i)
shift_left(cmd,3,0);
output_high(EEPROM_SELECT);
for(i=1;i<=20;++i) {
output_bit (EEPROM_DI, shift_left (cmd,3,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
if (i>12)
shift_left (&data, 1, input (EEPROM_DO));
}
output_low (EEPROM_SELECT);
return(data);
}
/////////////////////////////////////////////////////////////////
///
///
///
///
///
This file demonstrates how to use the real time
operating system to schedule tasks and how to use
the rtos_run function.
this demo makes use of the PIC18F452 prototyping board
///
///
///
///
///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
// this tells the compiler that the rtos functionality will be needed,
that
// timer0 will be used as the timing device, and that the minor cycle for
// all tasks will be 500 miliseconds
#use rtos(timer=0,minor_cycle=100ms)
// each function that is to be an operating system task must have the
#task
// preprocessor directive located above it.
// in this case, the task will run every second, its maximum time to run
is
// less than the minor cycle but this must be less than or equal to the
// minor cycle, and there is no need for a queue at this point, so no
// memory will be reserved.
#task(rate=1000ms,max=100ms)
// the function can be called anything that a standard function can be
called
void The_first_rtos_task ( )
{
printf("1\n\r");
}
357
相关PDF资料
PCI-EXP-T42G5-N1 IP CORE PCI EXPRESS ORCA 4
PCM18XH2 PROCESSOR MODULE MPLAB-ICE 2000
PCM18XN0 PROCESSOR MODULE FOR ICE2000
PDA-B-24-615-E-2B1-1-C CIRCUIT BREAKER MAG 1P 15A
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