AVR PS/2 Software Query Control Program

/************************************************************************         

Purpose: To establish a SimpleSoft test program for PS/2 (software query and read data received by PS/2)

Target system: Based on AVR microcontroller                                                 

Application software: ICCAVR                                                      

Version: Version 1.0                                                       

*************************************************************************/

/*01010101010101010101010101010101010101010101010101010101010101010101

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Version update record:

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Experimental content:

Press the PC keyboard, observe the data read by the microcontroller, and use the LED of the PA/PB port for indication.

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Hardware Connection:

Use a short-circuit cap to short-circuit the LED indicator lights of the PA/PB ports;

Plug the PC keyboard into the PS2 port.

Use a shorting cap to short PB0 and PS2.SDA.

Use a shorting cap to short PB1 and PS2.SCK

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Precautions: 

(1) If you have loaded a library function, please copy the "ICC_H" folder under the "library function" in the root directory of the CD to the D drive.

(2) Please read the “Must-Read” and related materials carefully.

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#include

#include "D:ICC_HCmmICC.H"

#include "D:ICC_HPS2.H"

#define PRESS_DATA_DDR DDRA

#define PRESS_DATA_PORT PORTA

#define SHIFT_DATA_DDR DDRD

#define SHIFT_DATA_PORT PORTD

#define SET_SDA sbi(PORTB,0)

#define CLR_SDA cbi(PORTB,0)

#define GET_SDA gbi(PINB,0)

#define OUT_SDA sbi(DDRB,0)

#define IN_SDA cbi(DDRB,0)

#define SET_SCK sbi(PORTB,1)

#define CLR_SCK cbi(PORTB,1)

#define GET_SCK gbi(PINB,1)

#define OUT_SCK sbi(DDRB,1)

#define IN_SCK cbi(DDRB,1)

#define DELAY() {NOP();NOP();NOP();NOP();}

bool rcvF = 0; //Whether the character flag is received

uint8 keyVal; //key value

/*--------------------------------------------------------------------

Function name: PS2

Function:

Precautions:

Tips:

enter:

return:

--------------------------------------------------------------------*/

void check(void)

{

static uint8 rcvBits = 0; //Number of receptions, number of interruptions

OUT_SCK; //Set "SCK_DDR" to output

DELAY();

SET_SCK; //"SCK_PORT" outputs "1"

DELAY();

IN_SCK; //Set "SCK_DDR" as input

DELAY();

if(!GET_SCK)

{

if((rcvBits>0) && (rcvBits<9))

{ 

keyVal=keyVal>>1; //Data is in LSB format

//IN_SDA; //When there are attribute settings for the keyboard, pay attention to input and output switching

//DELAY();

if(GET_SDA) 

keyVal=keyVal|0x80; 

}

rcvBits++;

while(!GET_SCK); //Wait for PS/2CLK to be pulled high

if(rcvBits>10)

{

rcvBits=0; //Receiving 11 times means receiving a frame of data

rcvF=1; //Indicates that a character has been entered

}

}

}

/*--------------------------------------------------------------------

Function name: PS2

Function:

Precautions:

Tips:

enter:

return:

--------------------------------------------------------------------*/

void keyHandle(uint8 val) 

{

uint8 i;

static bool isUp=0; //Button release action flag

static bool shift=0; //Shift key pressed flag

rcvF = 0; 

PRESS_DATA_PORT = val; //status indication

if(!isUp)

{

switch(val)

{

case 0xF0 : // a release action

isUp = 1;

break;

case 0x12 : // Left shift

shift = 1;

break;

case 0x59 : // Right shift

shift = 1;

break;

default:

if(!shift) // If shift not pressed

{ 

/*

for(i=0; unshifted[i][0]!=val && unshifted[i][0]; i++)

;

The above writing method is more flexible, but KEIL is not a UNIXC standard and cannot be used.

*/

for(i=0; unshifted[i][0]!=val && i<59; i++)

;

if (unshifted[i][0] == val) 

; //Status indication

} 

else // If shift pressed

{ 

/*

for(i=0; unshifted[i][0]!=val && unshifted[i][0]; i++)

;

The above writing method is more flexible, but KEIL is not a UNIXC standard and cannot be used.

*/

for(i=0; shifted[i][0]!=val && i<59; i++)

;

if(shifted[i][0] == val) 

SHIFT_DATA_PORT = val; //status indication

}

}

}

else 

{

isUp=0; 

switch(val)

{

case 0x12 : // Left SHIFT

shift = 0;

break;

case 0x59 : // Right SHIFT

shift = 0;

break;

}

}

} 

/*--------------------------------------------------------------------

Function name: PS2

Function:

Precautions:

Tips:

enter:

return:

--------------------------------------------------------------------*/

void main(void)

{

PRESS_DATA_DDR = 0XFF;

SHIFT_DATA_DDR = 0XFF;

IN_SDA;

while(1)

{

check();

if(rcvF)

keyHandle(keyVal);

}

}