timer.h

来自「WinCE 3.0 BSP, 包含Inter SA1110, Intel_815」· C头文件 代码 · 共 19 行

// Copyright (c) 1999-2000 Microsoft Corporation.  All rights reserved.
// Define the frequency of the system tick.
#define SYSTEM_TICK_MS  1      // time in milliseconds

// PIT oscillator is 1.19318 Mhz
#define TIMER_FREQ      1193180

// PIT granularity is then 1/1.19318, or 0.838097
#define TIMER_BASE      838

// Timer count value for 1 ms
#define OEM_COUNT_1MS (TIMER_FREQ / 1000)

// Timer count value for rescheduler period (1193 for 1 ms system tick)
#define TIMER_COUNT     ((SYSTEM_TICK_MS * TIMER_FREQ) / 1000)

BYTE CMOS_Read( BYTE offset );
void CMOS_Write( BYTE offset, BYTE value );