lpc32xx_kb.h

来自「NXP LPC3000系列 wince BSP包」· C头文件 代码 · 共 44 行

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//
// lpc32xx_kb.h
//
// PDD for the LPC32xx matrix keyboard driver
//

#pragma once

#include <windows.h>
#include <types.h>

// Matrix keyboard mask
#define MATRIX_PDD       0x10

// Matrix size used for the driver
#define MATRIXSIZE 1

// Matrix type
#define MATRIXTYPE _T("Matrix_409")

// Matrix scan time can be adjusted by changing the MATRIXDEBCYCLES and
// MATRIXDELCYCLES values below. A scan time of the entire matrix (in Hz)
// can be approximated by the following formula:
//  Scan frequency = 32768 / ((MATRIXSIZE * MATRIXDEBCYCLES) + (32 * MATRIXDELCYCLES))

// Number of debounce cycles per matrix scan
#define MATRIXDEBCYCLES 3 // 3 clocks per MATRIXSIZE

// Number of '32 clock' periods between each matrix scan state
#define MATRIXDELCYCLES 34 // Makes about a 30Hz scan rate