//ICC-AVR application builder : 2011/8/9 16:42:16
// Target : M128
// hui.he@qq.com
//本程序能够实现8个独立按键(接在同一组IO口上的),这里只给出了后四个按键的程序和电路
// Crystal: 8.0000Mhz
//开发工具：ICCAVR 7.2
#include <iom128v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int
//全局变量，在主程序中检测定时时间是否已到
unsigned char key_stime_ok;
//端口初始化，自动生成的代码
void port_init(void)
{
PORTA = 0xFF;
DDRA = 0xFF;
PORTB = 0xFF;
DDRB = 0xFF;
PORTC = 0xFF; //m103 output only
DDRC = 0xFF;
PORTD = 0xFF;
DDRD = 0xFF;
PORTE = 0xFF;
DDRE = 0xFF;
PORTF = 0xFF;
DDRF = 0xFF;
PORTG = 0xFF;
DDRG = 0xFF;
}
//TIMER0 initialize - prescale:1024
// WGM: CTC 比较方式，定时器0，定时10ms，程序是自动生成的
// desired value: 10mSec 延时10ms
// actual value: 10.112mSec (-1.1%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop
ASSR = 0x00; //set async mode
TCNT0 = 0xB2; //set count
OCR0 = 0x4E;
TCCR0 = 0x0F; //start timer
}
//中断服务子程序：定时器0，ctc比较溢出，中断号为16，可查询mega128的手册
#pragma interrupt_handler timer0_compa_isr:16
void timer0_compa_isr(void)
{
//compare occured TCNT1=OCR1A
key_stime_ok = 1;
}
//定义按键宏
#define key_1 0b11111110
#define key_2 0b11111101
#define key_3 0b11111011
#define key_4 0b11110111
#define key_5 0b11101111
#define key_6 0b11011111
#define key_7 0b10111111
#define key_8 0b01111111
#define key_no 0b11111111 //没有按键按下
//定义按键状态机，参考马潮的avr单片机教材第九章
#define key_state_0 0
#define key_state_1 1
#define key_state_2 2
//==================================================================
//检测是否有按键按下，返回值是所按按键的值（即前边定义的各键的宏）
//这是状态机检测按键的核心程序
//==================================================================
unsigned char read_key(void)
{
static unsigned char key_state = 0,key_old;
unsigned char key_press,key_return = key_no;
key_press = PIND | 0x0F ; // 读按键I/O电平 0x0F,表示只读取d4,d5,d6,d7引脚的值（根据电路）
switch (key_state)
{
case key_state_0: // 按键初始态
if (key_press != key_no) key_state = key_state_1; // 键被按下，状态转换到键确认态
break;
case key_state_1: // 按键确认态
if (key_press == key_old) // 与原电平比较（消抖处理）
{
key_return = key_press;
key_state = key_state_2; // 状态转换到判键释放态
}
else
key_state = key_state_0; // 按键已抬起，转换到按键初始态(消抖)
break;
case key_state_2:
if (key_press != key_old)
key_state = key_state_0; //按键已释放(或转按其它键)，转换到按键初始态
break;
}
key_old = key_press;
return key_return;
}
//初始化设备
//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV = 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
timer0_init();
MCUCR = 0x00;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x02; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
//主程序，判断按键值，并进行处理
void main(void)
{
unsigned char key_value;
init_devices();
while(1)
{
if(key_stime_ok) //每隔10ms进行检测是否按键按下
{
key_stime_ok=0;
key_value = read_key();
//判断是否有键按下
if (key_value != key_no) //判别键值并做相应的处理 key_no=0b11111111
{
switch (key_value)
{
case key_1:
//do samething
break;
case key_2:
//do samething
break;
case key_3:
//do samething
break;
case key_4:
//do samething
break;
case key_5:
PORTE ^= 1<<PE3; //led取反
break;
case key_6:
PORTE ^= 1<<PE2; //led取反
break;
case key_7:
PORTE ^= 1<<PE1; //led取反
break;
case key_8:
PORTE ^= 1<<PE0; //led取反
break;
}
}
}
}
}
ICCAVR 多个 按键 状态机 protues模拟 （103个子文件） 
main.c.110809152532 2B main.c.110809152634 214B main.c.110809152814 340B main.c.110809153102 363B main.c.110809153112 361B main.c.110809153152 339B main.c.110809153216 447B main.c.110809153244 437B main.c.110809153326 440B main.c.110809153356 404B main.c.110809153428 440B main.c.110809154218 209B main.c.110809154240 444B main.c.110809155734 1KB main.c.110809155820 1KB main.c.110809160334 1KB main.c.110809160442 1KB main.c.110809160652 1KB main.c.110809160658 1KB main.c.110809160854 1KB main.c.110809161108 1KB main.c.110809161256 1KB main.c.110809161550 1KB main.c.110809163148 1KB main.c.110809163216 2KB main.c.110809163314 2KB main.c.110809163324 2KB main.c.110809163538 2KB main.c.110809163750 2KB main.c.110809164232 2KB main.c.110809164508 2KB main.c.110809164616 2KB main.c.110809164652 2KB main.c.110809164710 2KB main.c.110809164718 2KB main.c.110809164728 2KB main.c.110809164752 2KB main.c.110809164820 2KB main.c.110809164846 2KB main.c.110809164858 2KB main.c.110809164938 2KB main.c.110809165056 2KB main.c.110809165146 2KB main.c.110809165256 2KB main.c.110809165408 3KB main.c.110809165424 3KB main.c.110809165546 3KB main.c.110809165612 3KB main.c.110809165624 3KB main.c.110809165640 3KB main.c.110809165744 3KB main.c.110809165752 3KB main.c.110809170054 3KB main.c.110809170234 3KB main.c.110809170424 3KB main.c.110809170552 3KB main.c.110809170614 3KB main.c.110809170750 3KB main.c.110809170816 3KB main.c.110809171052 3KB main.c.110809171508 3KB main.c.110809171512 3KB main.c.110810002830 3KB main.c.110810002834 3KB main.c.110810003804 3KB main.c.110810003818 3KB main.c.110810004028 3KB main.c.110810004136 3KB main.c.110810004238 3KB main.c.110810004404 3KB main.c.110810004432 3KB main.c.110810004502 3KB main.c.110810004810 3KB main.c.110810004848 3KB main.c.110810005422 4KB main.c.110810005500 4KB main.c.110810005512 4KB main.c.110810005704 4KB main.c.110810005738 4KB main.c.110810005958 4KB main.c.110810010104 4KB main.c.110810010112 4KB main.c.110810010136 4KB main.c.110810010140 4KB main.c.110810011214 5KB main.c.110810011620 5KB ti._ 1KB main._c 5KB main.c 5KB TIMER.cof 3KB TIMER.dbg 2KB Last Loaded button.DBK 46KB button.DSN 88KB TIMER.hex 1KB main.lis 22KB TIMER.lk 9B TIMER.lst 13KB TIMER.mak 607B TIMER.mp 2KB main.o 4KB共 103 条
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资源评论
搁浅的夜2011-09-24不错，是我要找的东西，只不过程序有点繁琐，不用判断旧键值，直接输出键值和返回键值比较即可- liyilin2013-03-25不错 有一定参考价值
