dianhuabohao__.c

电话拨号程序

/*****************************************************
Project : dianhuabohao
Chip type           : ATmega16
Program type        : Application
Clock frequency     : 4.000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*****************************************************/

#include <mega16.h>

flash unsigned char led_7[13]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x40};			  						
flash unsigned char position[8]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};
unsigned char	dis_buff[8];				
unsigned char	key_stime_counter;
unsigned char	posit;
bit	key_stime_ok; 

void display(void)					
{
		PORTC = 0xff;
		PORTA = led_7[dis_buff[posit]]; 
		PORTC = position[posit]; 
		if (++posit >=8 ) posit = 0;
}   

#define No_key 	255
#define K1_1	1
#define K1_2	2
#define K1_3	3
#define K2_1	4
#define K2_2	5
#define K2_3	6
#define K3_1	7
#define K3_2	8
#define K3_3	9
#define K4_1	10
#define K4_2	0
#define K4_3	11
#define Key_mask	0b00000111

unsigned char read_keyboard()
{	
    static unsigned char key_state = 0, key_value, key_line;
    unsigned char key_return = No_key,i;
	switch (key_state)
	{
		case 0:
			key_line = 0b00001000;
			for (i=1; i<=4; i++)					// 扫描键盘
			{	
				PORTD = ~key_line;					// 输出行线电平
				PORTD = ~key_line;					// 送2次
			     key_value = Key_mask & PIND;		// 读列电平
				if (key_value == Key_mask)
					key_line <<= 1;				// 没有按键，继续扫描
				else
				{
					key_state++;					// 有按键，停止扫描
					break;						// 转消抖确认状态
				}
			}
			break;
		case 1:
			if (key_value == (Key_mask & PIND))		// 再次读列电平，
			{
				switch (key_line | key_value)		// 与状态0的相同，确认按键
				{								// 键盘编码，返回编码值 
					case 0b00001110:
						key_return = K1_1;
						break;
					case 0b00001101:
						key_return = K1_2;
						break;
 					case 0b00001011:
						key_return = K1_3;
						break;
 					case 0b00010110:
						key_return = K2_1;
						break;
 					case 0b00010101:
						key_return = K2_2;
						break;
					case 0b00010011:
						key_return = K2_3;
						break;
 					case 0b00100110:
						key_return = K3_1;
						break;
 					case 0b00100101:
						key_return = K3_2;
						break;
					case 0b00100011:
						key_return = K3_3;
						break;
 					case 0b01000110:
						key_return = K4_1;
						break;
 					case 0b01000101:
						key_return = K4_2;
						break;
					case 0b01000011:
						key_return = K4_3;
						break;
				}
				key_state++;				// 转入等待按键释放状态
			}
			else
				key_state--;				// 两次列电平不同返回状态0，（消抖处理）
			break;						
		case 2:							// 等待按键释放状态
			PORTD = 0b00000111;			// 行线全部输出低电平
			PORTD = 0b00000111;			// 重复送一次
			if ( (Key_mask & PIND) == Key_mask)
				key_state=0;				// 列线全部为高电平返回状态0
			break;
	}
	return key_return;
}


// Timer 0 output compare interrupt service routine
interrupt [TIM0_COMP] void timer0_comp_isr(void)
{
    display();						   
    if (++key_stime_counter >=5)
	{
		key_stime_counter = 0;
		key_stime_ok = 1;				// 10ms
	} 
}

void main(void)
{   
    unsigned char i, key_temp;
    PORTA=0x00;
    DDRA=0xFF;

    PORTB=0x00;
    DDRB=0xFF;

    PORTC=0xFF;
    DDRC=0xFF;

    PORTD=0x00;
    DDRD=0xF8;

    TCCR0=0x0B;
    TCNT0=0x00;
    OCR0=0x7C;  

    TCCR1A=0x40;
    TCCR1B=0x08;                    //???

    TIMSK=0x12;
    
    for (i=0; i<8 ;i++)
    {
        dis_buff[i]=10;
    }		                        // LED初始显示8个"-"

    #asm("sei")

while (1)
    {
        if (key_stime_ok)				
			{
				key_stime_ok = 0;				// 10ms到
				key_temp = read_keyboard();		// 调用键盘接口函数读键盘
				if (key_temp != No_key)
				{							    // 有按键按下
					for (i=0; i<7; i++)
					{
					    dis_buff[i] = dis_buff[i+1];
					}	                            // LED显示左移一位
					dis_buff[7] = key_temp; 		// 最右显示新按下键的键值
				}
			}
    };
}