timer.h

来自「This is IR (Infra-Red) learn module for 」· C头文件 代码 · 共 37 行

#ifndef __TIMER_H__
#define __TIMER_H__

/*
 *  FILE:
 *     timer.h (rev. 1.1 - 14.04.2006)
 *
 *  PROJECT:
 *     IR Learn System 
 *  
 *  DESCRIPTION:
 *     Contains definitions for precise hardware delays
 *     with Timer 0
*/  

#include <types.h>

// Oscillator resonator frequency (in Hz) e.g. (11059200UL)
#define OSC_FREQ (22118400UL)

// Number of oscillations per instruction (12, etc)
#define OSC_PER_INST (12)   
                 
// Define Timer reload values for ~100 us delay
#define TMR_Val (65536 - (unsigned int)(OSC_FREQ / (OSC_PER_INST * 14700UL)))
#define TMR_Hi  (TMR_Val/256)
#define TMR_Lo  (TMR_Val%256)

extern U16 SYS_Timer;       // System Timer
extern U16 TMP_Timer;       // General purposes Timer

void TMR_Init(void);        // Initialize and start Timer 0
void TMR_Timer(void);       // System Timer (resolution: 1 msec)
void TMR_Delay(U16 Delay);  // Hardware delay (in 1/10 msec)

#endif