仿真+51单片机设计程序 电子琴.rar

#define KEY_GLOBAL 1 #include "Key.h" static uchar keyValueBuff; //读取键值的缓冲区 static uchar keyValueOld; //前一次的键值 static uchar keyValueTemp; //键值中间交换变量 static uint stillTimes; //键按下保持次数 static uint stillTimesMax; static uchar get_data_1_count(uchar number); static void read_all_key(uchar *buff); /******************************************* *函数名称：key_init(void) *函数功能：初始化按键扫描 *函数入口：无 *函数出口：无 *******************************************/ void key_init(void) { keyValueBuff = 0x00; keyValueOld = 0x00; keyValueTemp = 0x00; stillTimes = 0; stillTimesMax = FIRST_TIMES; } /****************************************************** *函数名称：read_all_key(uchar *buff) *函数功能：扫描按键下的键，将按下的键的位置存入变量buff *函数入口：buff *函数出口：无 *******************************************************/ void read_all_key(uchar *buff) { if(IN_PRESS_ONE==KEY_FORCE_VALUE) //检测按下的键 READ_KEY(1,KEY_ONE,*buff); else READ_KEY(0,KEY_ONE,*buff); if(IN_PRESS_TWO==KEY_FORCE_VALUE) READ_KEY(1,KEY_TWO,*buff); else READ_KEY(0,KEY_TWO,*buff); if(IN_PRESS_THREE==KEY_FORCE_VALUE) READ_KEY(1,KEY_THREE,*buff); else READ_KEY(0,KEY_THREE,*buff); if(IN_PRESS_FOUR==KEY_FORCE_VALUE) READ_KEY(1,KEY_FOUR,*buff); else READ_KEY(0,KEY_FOUR,*buff); if(IN_PRESS_FIVE==KEY_FORCE_VALUE) READ_KEY(1,KEY_FIVE,*buff); else READ_KEY(0,KEY_FIVE,*buff); if(IN_PRESS_SIX==KEY_FORCE_VALUE) READ_KEY(1,KEY_SIX,*buff); else READ_KEY(0,KEY_SIX,*buff); if(IN_PRESS_SEVEN==KEY_FORCE_VALUE) READ_KEY(1,KEY_SEVEN,*buff); else READ_KEY(0,KEY_SEVEN,*buff); } /****************************************************** *函数名称：get_key_value(void) *函数功能：读取键值 *函数入口：无 *函数出口：返回按下的有效键值 *******************************************************/ uchar get_key_value(void) { keyValueBuff = 0x00; read_all_key(&keyValueBuff); keyValueTemp = keyValueBuff; delay_us(KEY_DELAY_TIME); read_all_key(&keyValueBuff); /* 两次读到的键盘值相同 则为有效键盘值 */ if( keyValueTemp == keyValueBuff ) { if(keyValueTemp == 0) { keyValueOld = 0; stillTimes = 0; stillTimesMax = FIRST_TIMES; return 0; } else if(keyValueOld != keyValueTemp) { stillTimes = 0; keyValueOld = keyValueTemp; #if CAN_MORE_PRESS return keyValueTemp; #else if( 1 == get_data_1_count(keyValueTemp) ) { return keyValueTemp; } else { return 0; } #endif } else if(keyValueOld == keyValueTemp) { #if CAN_MORE_PRESS == 0 if( 1 != get_data_1_count(keyValueTemp) ) { stillTimes = 0; return 0; } #endif #if CAN_REPEAT stillTimes ++; if(stillTimes > stillTimesMax) { stillTimes = 0; #if REPEAT_MODE if(FIRST_TIMES == stillTimesMax) { stillTimesMax = OTHER_TIMES; } #endif return keyValueTemp; } #else stillTimes = 0; return 0; #endif } } else { stillTimes = 0; return 0; } return 0; } /********************************************************** *函数名称：get_data_1_count(uchar number) *函数功能：计算uchar类型变量中1的数量，用于检测是否多键按下 *函数入口：number,需要检测1数量的变量 *函数出口：返回变量bumber中1的数量 ***********************************************************/ uchar get_data_1_count(uchar number) { register uchar i,j = 0; for(i = 0; i < 8; i ++) { if( (number&_BV(i)) ) { j ++; } } return j; } /********************************************************** *函数名称：delay_us(uint us) *函数功能：毫秒级延时 *函数入口：延时计数变量us *函数出口：无 ***********************************************************/ void delay_us(uint us) { uchar delayi; while(--us) { for(delayi=0;delayi<10;delayi++); } }