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keybord.c
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keybord.c
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#include "i2c.h"
#include "keybord.h"
#include "main.h"
////////////////////////////////////////////////////////////////////////////////
// read key is pressed
////////////////////////////////////////////////////////////////////////////////
unsigned char read_keybord(void)
{
unsigned char d,x;
pcf8574_read( 0, U27_ADDR, &d);
d = d & KEY_MASK;
if (d == KEY_MASK) // íåò íàæàòûõ êîíîïîê
return 0;
// íàæàòà êíîïêà
delay_ms(20);
pcf8574_read( 0, U27_ADDR, &d);
d = d & KEY_MASK;
if (d == KEY_MASK) // íåò íàæàòûõ êîíîïîê ØÓÌ
return 0;
x = d; // çàïîìíèëè íàæàòûå êîíîïêè
// æäåì êîãäà îòïóñòèò êíîïêó
do{
delay_ms(20);
pcf8574_read( 0, U27_ADDR, &d);
d = d & KEY_MASK;
}while (d != KEY_MASK);
return (~x) & KEY_MASK;
}