单片机驱动标准pc机键盘的C51程序
网上流行的这个程充很垃圾,
在我的单片机上无论如何都调试不成功.
正确的程序见http://home.hn8868.com/tary/download.html
该程序由AVR程序移植过来...
C语言写的,风格棒极了.
在P1口显示ASCII吗，也有使用LCD1602显示的，需要的请连系我.
以下是主要的代码KB.C
#include <Atmel\AT89X52.h>
#include "Pindefs.h"
#include "kb.h"
#include "gpr.h"
#include "Disp1602.h"
#include "Scancodes.h"
#define BUFF_SIZE 32
unsigned char edge, bitcount; // 0 = neg. 1 = pos.
unsigned char kb_buffer[BUFF_SIZE];
unsigned char *inpt, *outpt;
unsigned char buffcnt;
void init_kb(void)
{
inpt = kb_buffer; // Initialize buffer
outpt = kb_buffer;
buffcnt = 0;
// INT0 interrupt on falling edge
edge = 0; // 0 = falling edge 1 = rising edge
bitcount = 11;
}
void INT0_interrupt(void) interrupt 0 using 2
{
static unsigned char cdata; // Holds the received scan code
EA = 0;
if (!edge) // Routine entered at falling edge
{
if(bitcount < 11 && bitcount > 2) // Bit 3 to 10 is data. Parity bit,
{ // start and stop bits are ignored.
cdata = (cdata >> 1);
if(PIND)
cdata = cdata | 0x80; // Store a '1'
}
/*MCUCR = 3; */ // Set interrupt on rising edge
edge = 1;
}
if (edge) { // Routine entered at rising edge
/*MCUCR = 2; */ // Set interrupt on falling edge
edge = 0;
if(--bitcount == 0) // All bits received
{
decode(cdata);
bitcount = 11;
}
}
EA = 1;
}
void decode(unsigned char sc)
{
//extern void clr(void);
static unsigned char is_up = 0, shift = 0, mode = 0;
unsigned char i;
if (!is_up) // Last data received was the up-key identifier
{
switch (sc)
{
case 0xF0 : // The up-key identifier
is_up = 1;
break;
case 0x12 : // Left SHIFT
shift = 1;
break;
case 0x59 : // Right SHIFT
shift = 1;
break;
case 0x05 : // F1
if(mode == 0)
mode = 1; // Enter scan code mode
if(mode == 2)
mode = 3; // Leave scan code mode
break;
default:
if(mode == 0 || mode == 3) // If ASCII mode
{
if(!shift) // If shift not pressed,
{ // do a table look-up
for(i = 0; unshifted[0]!=sc && unshifted[0]; i++);
if (unshifted[0] == sc) {
put_kbbuff(unshifted[1]);
}
} else { // If shift pressed
for(i = 0; shifted[0]!=sc && shifted[0]; i++);
if (shifted[0] == sc) {
put_kbbuff(shifted[1]);
}
}
} else{ // Scan code mode
print_hexbyte(sc); // Print scan code
put_kbbuff(' ');
put_kbbuff(' ');
}
break;
}
} else {
is_up = 0; // Two 0xF0 in a row not allowed
switch (sc)
{
case 0x12 : // Left SHIFT
shift = 0;
break;
case 0x59 : // Right SHIFT
shift = 0;
break;
case 0x05 : // F1
if(mode == 1)
mode = 2;
if(mode == 3)
mode = 0;
break;
case 0x06 : // F2
clr();
break;
}
}
}
void put_kbbuff(unsigned char c)
{
if (buffcnt < BUFF_SIZE) // If buffer not full
{
*inpt = c; // Put character into buffer
inpt++; // Increment pointer
buffcnt++;
if (inpt >= kb_buffer + BUFF_SIZE) // Pointer wrapping
inpt = kb_buffer;
}
}
int getchar(void)
{
int byte;
while(buffcnt == 0); // Wait for data
byte = *outpt; // Get byte
outpt++; // Increment pointer
if (outpt >= kb_buffer + BUFF_SIZE) // Pointer wrapping
outpt = kb_buffer;
buffcnt--; // Decrement buffer count
return byte;
}
相关链接:http://home.hn8868.com/tary/download.html |
楼主
标题置顶
标题高亮
