📄 demo_9_3.i
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/*********************************************
File name : experiment 9
Chip type : ATmega16
Program type : Application
Clock frequency : 4.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 256
*********************************************/
// CodeVisionAVR C Compiler
// (C) 1998-2001 Pavel Haiduc, HP InfoTech S.R.L.
// I/O registers definitions for the ATmega16
#pragma used+
sfrb TWBR=0;
sfrb TWSR=1;
sfrb TWAR=2;
sfrb TWDR=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4; // 16 bit access
sfrb ADCSRA=6;
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRRL=9;
sfrb UCSRB=0xa;
sfrb UCSRA=0xb;
sfrb UDR=0xc;
sfrb SPCR=0xd;
sfrb SPSR=0xe;
sfrb SPDR=0xf;
sfrb PIND=0x10;
sfrb DDRD=0x11;
sfrb PORTD=0x12;
sfrb PINC=0x13;
sfrb DDRC=0x14;
sfrb PORTC=0x15;
sfrb PINB=0x16;
sfrb DDRB=0x17;
sfrb PORTB=0x18;
sfrb PINA=0x19;
sfrb DDRA=0x1a;
sfrb PORTA=0x1b;
sfrb EECR=0x1c;
sfrb EEDR=0x1d;
sfrb EEARL=0x1e;
sfrb EEARH=0x1f;
sfrw EEAR=0x1e; // 16 bit access
sfrb UBRRH=0x20;
sfrb UCSRC=0X20;
sfrb WDTCR=0x21;
sfrb ASSR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
sfrb OCR1BL=0x28;
sfrb OCR1BH=0x29;
sfrw OCR1B=0x28; // 16 bit access
sfrb OCR1AL=0x2a;
sfrb OCR1AH=0x2b;
sfrw OCR1A=0x2a; // 16 bit access
sfrb TCNT1L=0x2c;
sfrb TCNT1H=0x2d;
sfrw TCNT1=0x2c; // 16 bit access
sfrb TCCR1B=0x2e;
sfrb TCCR1A=0x2f;
sfrb SFIOR=0x30;
sfrb OSCCAL=0x31;
sfrb OCDR=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TWCR=0x36;
sfrb SPMCR=0x37;
sfrb TIFR=0x38;
sfrb TIMSK=0x39;
sfrb GIFR=0x3a;
sfrb GICR=0x3b;
sfrb OCR0=0X3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-
// Interrupt vectors definitions
// Needed by the power management functions (sleep.h)
#asm
#ifndef __SLEEP_DEFINED__
#define __SLEEP_DEFINED__
.EQU __se_bit=0x40
.EQU __sm_mask=0xB0
.EQU __sm_powerdown=0x20
.EQU __sm_powersave=0x30
.EQU __sm_standby=0xA0
.EQU __sm_ext_standby=0xB0
.EQU __sm_adc_noise_red=0x10
.SET power_ctrl_reg=mcucr
#endif
#endasm
flash unsigned char led_7[13]={0x3F,0x06,0x5B,0x4F,0x66,0x6D, // 字型码
0x7D,0x07,0x7F,0x6F,0x40}; // 最后1位为 "-"
flash unsigned char position[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
flash unsigned int t[12] = {1692,3824,3460,3035,2865,2551,2273,2024,1912,1817,0,0}; //对于4MHz晶振，{3!,1,2,3,4,5,6,7,1!,2!}的半周期
flash unsigned char d[12] = {236,105,116,132,140,157,176,198,209,220,0,0}; //0.1s内，以上半周期重复的次数
unsigned char dis_buff[8]; // 显示缓冲区，存放要显示的8个字符的段码值
unsigned char key_stime_counter;
unsigned char posit;
bit key_stime_ok,play_on;
unsigned char key_temp;
unsigned int int_n;
void display(void) // 8位LED数码管动态扫描函数
{
PORTC = 0xff;
PORTA = led_7[dis_buff[posit]];
PORTC = position[posit];
if (++posit >=8 ) posit = 0;
}
// Timer 2 比较匹配中断服务,2ms定时
interrupt [4] void timer2_comp_isr(void)
{
display(); // 调用LED扫描显示
if (++key_stime_counter >=5)
{
key_stime_counter = 0;
key_stime_ok = 1; // 10ms到
}
}
unsigned char read_keyboard()
{
static unsigned char key_state = 0, key_value, key_line;
unsigned char key_return = 255,i;
switch (key_state)
{
case 0:
key_line = 0b00001000;
for (i=1; i<=4; i++) // 扫描键盘
{
PORTB = ~key_line; // 输出行线电平
PORTB = ~key_line;
key_value = 0b00000111 & PINB; // 读列电平
if (key_value == 0b00000111)
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 == (0b00000111 & PINB)) // 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 = 1; break;
case 0b00001101: key_return = 2; break;
case 0b00001011: key_return = 3; break;
case 0b00010110: key_return = 4; break;
case 0b00010101: key_return = 5; break;
case 0b00010011: key_return = 6; break;
case 0b00100110: key_return = 7; break;
case 0b00100101: key_return = 8; break;
case 0b00100011: key_return = 9; break;
case 0b01000110: key_return = 10; break;
case 0b01000101: key_return = 0; break;
case 0b01000011: key_return = 11; 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
PORTB = 0b00000111; // 行线全部输出低电平
PORTB = 0b00000111; // 重复送一次
if ( (0b00000111 & PINB) == 0b00000111)
key_state=0; // 列线全部为高电平返回状态0
break;
}
return key_return;
}
interrupt [7] void timer1_compa_isr(void) // T/C1比较匹配中断服务
{
if ((--int_n == 0) && play_on) // int_n在主程序中赋值，在中断中使用，属于敏感信号，需加play_on做开关
{
TCCR1B = 0x08; // 停止T/C1工作
play_on = 0;
}
}
void main(void)
{
unsigned char i;
PORTA = 0x00; // 显示控制I/O端口初始化
DDRA = 0xFF;
PORTB = 0xFF; // 键盘接口初始化
DDRB = 0xF8; // PB2、PB1、PB0列线，输入方式，上拉有效
PORTC = 0xFF;
DDRC = 0xFF;
PORTD=0x00;
DDRD = 0x20; // PD5匹配输出方式，脉冲输出，驱动发声
// T/C2 初始化
TCCR2=0x0B; // 内部时钟，64分频（4M/64=62.5KHz），CTC模式
TCNT2=0x00;
OCR2=0x7C; // OCR2 = 0x7C(124),(124+1)/62.5=2ms
// T/C1 初始化
TCCR1A=0x40;
TCCR1B=0x08;
TIMSK=0x90; // 允许T/C1和T/C2比较匹配中断
for (i=0; i<8 ;i++)
{dis_buff[i]= 10;} // LED初始显示8个"-"
#asm("sei") // 开放全局中断
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 != 255)
{ // 有按键按下
if (key_temp == 10)
{
for (i=0; i<8 ;i++)
{dis_buff[i]= 10;}
}
else if (key_temp == 11)
{
for (i=0; i<7; i++)
{dis_buff[i] = dis_buff[i+1];} // LED显示右移一位
dis_buff[7] = 10;
}
else
{
if (!play_on)
{
play_on = 1;
OCR1A = t[key_temp]; // 以半周期长度作为比较值
int_n = d[key_temp];
TCCR1B = 0x09;
}
for (i=7; i>0; i--)
{dis_buff[i] = dis_buff[i-1];} // LED显示左移一位
dis_buff[0] = key_temp; // 最右显示新按下键的键值
}
}
}
}
}
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