pc_8535.rar

#include <io8535.h> #include <macros.h> #include "pindefs.h" #include "scancodes.h" #define BUFF_SIZE 64 //const ascii[16]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38, // 0x39,0x41,0x42,0x43,0x44,0x45,0x46}; unsigned char bitcount;//PC键盘数据长度计数 unsigned char kb_buffer[BUFF_SIZE];//键盘缓冲区 unsigned char input=0;//缓冲区读指针 unsigned char output=0;//缓冲区写指针 //送键盘按键ASCII码到键盘缓冲区 void put_kbbuff(unsigned char c) { kb_buffer[input]=c; if (input<(BUFF_SIZE-1)) input++; else input=0; } //从键盘缓冲区读取按键的ASCII码 unsigned char get_char(void) { unsigned char temp; if(output==input) return 0; else { temp=kb_buffer[output]; if(output<(BUFF_SIZE-1)) { output++; } else output=0; return temp; } } //为运行读取PC键盘程序进行初始化 void init_kb(void) { MCUCR=0x02;//设置8515的INT0为下降沿触发中断 GIMSK|=(1<<INT0);//使能INT0中断 SEI(); //开中断 bitcount = 11; } //对PC键盘的扫描码进行解码 void decode(unsigned char sc) { static unsigned char shift,up,shiftup; unsigned char i; if (sc==0xf0)//按键释放 { up=1; return; } if (up==1)//SHIF键开关 { up=0; if ((sc==0x12)|(sc==0x59)) shift=0; return; } switch (sc) { case 0x12:{//检测左SHIF键 shift=1; shiftup=1; } case 0x59:{//检测右SHIF键 shift=1; shiftup=1; } default:{ if (shift==0) { for(i = 0;unshifted[i][0]!=sc && unshifted[i][0]; i++); if (unshifted[i][0] == sc) put_kbbuff(unshifted[i][1]); } else { for(i = 0;shifted[i][0]!=sc && shifted[i][0]; i++); if (shifted[i][0] == sc) { put_kbbuff(shifted[i][1]); } } } } } //键盘数据读取程序 #pragma interrupt_handler int0_isr:2 void int0_isr(void) { static unsigned char data; switch (bitcount) { case 11:{ if ((PIN_KB&(1<<DATAPIN))!=0) return; else bitcount--; break;} case 2:{ bitcount--; break;} case 1:{ bitcount--; if ((PIN_KB&(1<<DATAPIN))==0) { bitcount=11; return; } else { bitcount=11; decode(data); } break;} default:{ data = (data >> 1); if((PIN_KB&(1<<DATAPIN))!=0) data|=0x80; bitcount--; } } }