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torben |
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#include "myi2c.h"
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#include "keyboard.h"
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#include "delay.h"
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#define DRIVER 0x70
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#define SCANNER 0x72
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unsigned char keyboard_read_hardware(unsigned char scancode)
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{
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unsigned char ack,read;
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ack = StartI2C(DRIVER);
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WriteI2CByte( scancode );
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StopI2C();
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DelayUs(4); //I2C spec's siger min 4.7 uSec mellem stop og nęste start
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ack = ReStartI2C(SCANNER | 0x01); //read-mode
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read = ReadI2CByte(0); //Lastbyte
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StopI2C();
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DelayUs(4);
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read &= 0x0F; //clear upper 4 bit
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if (ack)
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return read;
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else
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return 0;
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}
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unsigned char keyboard_read(void)
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{
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unsigned char read;
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read = keyboard_read_hardware(0x0E);
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switch(read)
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{
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case 0x0e:
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return 'C';
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case 0x0D:
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return 'D';
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case 0x0B:
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return 'E';
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case 0x07:
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return 'F';
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}
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read = keyboard_read_hardware(0x0D);
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switch(read)
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{
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case 0x0e:
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return 'B';
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case 0x0d:
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return '9';
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case 0x0B:
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return '6';
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case 0x07:
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return '3';
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}
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read = keyboard_read_hardware(0x0b);
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switch(read)
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{
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case 0x0e:
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return '0';
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case 0x0d:
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return '8';
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case 0x0B:
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return '5';
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case 0x07:
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return '2';
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}
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read = keyboard_read_hardware(0x07);
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switch(read)
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{
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case 0x0e:
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return 'A';
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case 0x0d:
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return '7';
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case 0x0B:
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return '4';
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case 0x07:
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return '1';
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}
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return 0;
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}
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unsigned char keyboard_read_safe(void)
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{
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static unsigned char last_read;
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unsigned char key,returnkey;
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returnkey = 0;
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key = keyboard_read();
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if (last_read == 0 && key != 0)
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{
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returnkey = key;
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}
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last_read = key;
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return returnkey;
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}
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