timer_KEYSCAN.rar_KEYscan_button debounce

#define _MAIN_C #include "config.h" const uint8 code LedNum[] = { //数码管显示的字符转化表 LED_NUM_0, LED_NUM_1, LED_NUM_2, LED_NUM_3, LED_NUM_4, LED_NUM_5, LED_NUM_6, LED_NUM_7, LED_NUM_8, LED_NUM_9, LED_NUM_A, LED_NUM_b, LED_NUM_C, LED_NUM_d, LED_NUM_E, LED_NUM_F, }; volatile uint8 KeySta[4][4]; //当前的按键状态 /* * 函数名：KeyScan * 描 述：矩阵式按键扫描函数 * 备 注：本函数需在定时中断中调用，其定时时间和DEBOUNCE_MASK常数共同决定消抖时间； * 如调用本函数的中断服务函数用using指定了寄存器组，则本函数也需用using指定相同的寄存器组。 */ void KeyScan(void) { uint8 i; static uint8 iKeyOut=0; static uint8 KeyScanBuff[4][4]; /* 扫描按键输入 */ KeyScanBuff[iKeyOut][0] = ((KeyScanBuff[iKeyOut][0]<<1) | KEY_IN_1) & DEBOUNCE_MASK; KeyScanBuff[iKeyOut][1] = ((KeyScanBuff[iKeyOut][1]<<1) | KEY_IN_2) & DEBOUNCE_MASK; KeyScanBuff[iKeyOut][2] = ((KeyScanBuff[iKeyOut][2]<<1) | KEY_IN_3) & DEBOUNCE_MASK; KeyScanBuff[iKeyOut][3] = ((KeyScanBuff[iKeyOut][3]<<1) | KEY_IN_4) & DEBOUNCE_MASK; /* 消抖后更新按键状态 */ for (i=0; i<4; i++) { if (KeyScanBuff[iKeyOut][i] == DEBOUNCE_MASK) { KeySta[iKeyOut][i] = KEY_UP; } else if (KeyScanBuff[iKeyOut][i] == 0) { KeySta[iKeyOut][i] = KEY_DOWN; } } /* 执行下一列按键输出 */ iKeyOut = (iKeyOut+1) & 0x3; switch (iKeyOut) { case 0: KEY_OUT_4 = 1; KEY_OUT_1 = 0; break; case 1: KEY_OUT_1 = 1; KEY_OUT_2 = 0; break; case 2: KEY_OUT_2 = 1; KEY_OUT_3 = 0; break; case 3: KEY_OUT_3 = 1; KEY_OUT_4 = 0; break; default: break; } } /* * 函数名：KeyHandle * 描 述：按键动作分离及动作执行函数 * 备 注： */ void KeyHandle(void) { uint8 i, j; static uint8 bkKey[4][4]; /* 检索按键状态的变化 */ for (i=0; i<4; i++) { for (j=0; j<4; j++) { if (bkKey[i][j] != KeySta[i][j]) { if (bkKey[i][j] == KEY_UP) { /* 按键按下时的动作 */ _nop_(); } else { /* 按键弹起时的动作 */ DISP_DB = LedNum[i*4+j]; } bkKey[i][j] = KeySta[i][j]; } } } } /* * 函数名：main * 描 述：工程的C语言入口函数 * 备 注： */ int main (void) { //按键扫描使用timer1 TMOD = 0x11; PT1 = 0; ET1 = 1; TR1 = 1; DISP_A0 = 0; DISP_A1 = 0; DISP_A2 = 0; EN_LED2 = 1; EN_LED1 = 0; DISP_DB = 0xFF; EA = 1; while(1) { KeyHandle(); } } /* * 函数名：Timer1_ISR * 描 述：Timer1定时中断服务函数 * 备 注：定时1ms，执行按键扫描 */ void Timer1_ISR() interrupt 3 { /* Timer1定时1ms */ TL1 = (uint8)((65535 - SYS_MCLK/1000) + 20); TH1 = (uint8)(((65535 - SYS_MCLK/1000) + 20) >> 8); /* 按键扫描 */ KeyScan(); }