mouse.c File Reference

Mouse protocol implementation. More...

#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <avr/pgmspace.h>
#include <stdio.h>
#include <stdlib.h>
#include "usrat.h"
#include "ioconfig.h"
#include "ps2.h"
#include "mouse.h"
#include "tdelay.h"

Include dependency graph for mouse.c:

Functions
uint8_t	mouse_reset ()
int16_t	mouse_command (uint8_t cmd, uint8_t wait)
void	mouse_setres (uint8_t res)
	Set mouse resolution.
uint8_t	mouse_boot ()
	Boot mouse, check and return initial button state.
Variables
const char PSTR_OK[]	PROGMEM = "OK"

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Detailed Description

Mouse protocol implementation.

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Function Documentation

uint8_t mouse_boot

(

)

Boot mouse, check and return initial button state.

Returns:

initial button status (bits 2,1,0 == left,middle,right)

                     {
    uint8_t buttons = 0;
    
    ps2_enable_recv(1);

    for(;;) {
        printf_P(PSTR("\nRESET: "));
        if (mouse_reset() == 0) {
            puts_P(PSTR_OK);
            break;
        } else {
            puts_P(PSTR_ERROR);
        }
    }

    mouse_command(MOUSE_DDR, 1);
    mouse_command(MOUSE_SETSCALE21, 1);
    
    mouse_command(MOUSE_SETRES, 1);
    mouse_command(1,1);             // 0 = 1, 1 = 2, 2 = 4, 3 = 8 counts/mm

    mouse_command(MOUSE_STATUSRQ, 1);
    tdelay(22);
    if (ps2_avail()) buttons = ps2_getbyte() & 7;
    
    mouse_flush(22);
    
    printf_P(PSTR("B:%x\n"), buttons);

    mouse_command(MOUSE_EDR, 1);

    mouse_flush(100);

    printf_P(PSTR("\n"));
    
    return buttons;    
}

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int16_t mouse_command	(	uint8_t	cmd,
		uint8_t	wait
	)

                                                 {
    int16_t response = -1;
    
    ps2_sendbyte(cmd);
    if (wait) {
        tdelay(22);
        if (ps2_avail()) response = ps2_getbyte();
    }
    
    printf_P(PSTR("%02x>%02x "), cmd, response); 
    
    return response;
}

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uint8_t mouse_reset

(

)

                      {
    uint8_t i, b = 33;
    const int ntries = 11;

    // send reset command    
    ps2_sendbyte(MOUSE_RESET);
    ps2_sendbyte(MOUSE_RESET);
    ps2_sendbyte(MOUSE_RESET);
    
    // wait for some time for mouse self-test to complete
    for (i = 0; i < ntries; i++) {
        tdelay(250);
        if (ps2_avail()) {
            b = ps2_getbyte(); printf_P(PSTR("%02x "));
            if (b == MOUSE_RESETOK) {
                break;
            } else {
                i = ntries;
                break;
            }
        }
    }

    if (i == ntries) return -1;
    
    // flush the rest of reponse, most likely mouse id == 0
    tdelay(100);
    mouse_flush(0);
    
    return 0;
}

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void mouse_setres

(

uint8_t

res

)

Set mouse resolution.

Parameters:

res

resolution code 0: 1 count per mm 1: 2 counts per mm 2: 4 counts per mm 3: 8 counts per mm

                               {
    mouse_command(MOUSE_DDR,1);
    
    mouse_command(MOUSE_SETRES, 1);
    mouse_command(res, 1);             // 0 = 1, 1 = 2, 2 = 4, 3 = 8 counts/mm
    
    mouse_command(MOUSE_EDR,1);
}

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Variable Documentation

const char PSTR_ERROR [] PROGMEM = "OK"