10533c876689001d1e908c0bc771dfd8

基于ALTERA公司的NIOSII的通用TFT-LCD控制器及PS2鼠标设计

#include "system.h"
#include "altera_up_avalon_ps2.h"
#include "altera_up_ps2_mouse.h"
//#include "altera_up_avalon_ps2_regs.h"
#include <stdio.h>
#include "alt_types.h"
#include "GUI.h"

#define LEFT_BUTTON_DOWN        0
#define RIGHT_BUTTON_DOWN       1  

int getButton_down(alt_u8 first_byte)
{
    if(first_byte & 0x01){
        return LEFT_BUTTON_DOWN;
    }
    else if(first_byte & 0x02){
        return RIGHT_BUTTON_DOWN;
    }
    else{
        return -1;
    }
}

int getMouse_displacement_x(alt_u8 first_byte,alt_u8 second_byte)
{
    int displacement_x;
    //符号位
    if(first_byte & 0x10){
        second_byte = ~second_byte;
        displacement_x = -(second_byte);
            //printf("%d\n",displacement_x);
    }
    else{
        displacement_x = second_byte;        
    }

    return displacement_x;
}
   
int getMouse_displacement_y(alt_u8 first_byte,alt_u8 third_byte)
{
    int displacement_y;
    //符号位
    if(first_byte & 0x20){
        displacement_y = third_byte;
    }
    else{
        third_byte = ~third_byte;
        displacement_y = -(third_byte); 
            //printf("%d\n",displacement_y);       
    }

    return displacement_y;
}
    

int x = 150;
int y = 100;
void handle_mouse_interrupts(void* context, alt_u32 id)
{
    alt_u8 string[3];
    alt_u8 temp;
    alt_up_ps2_read_data_byte(context,&temp);
    if(((temp & 0x08) != 0) && ((temp & 0x80) == 0) && ((temp & 0x40) == 0) && ((temp & 0x04) == 0) && temp != NULL){
        string[0] = temp;
        alt_up_ps2_read_data_byte(context,&string[1]);
        alt_up_ps2_read_data_byte(context,&string[2]);
        int button = getButton_down(string[0]);
       /* if(button == LEFT_BUTTON_DOWN){
            printf("Left button pressed\n");
        }
        else if(button == RIGHT_BUTTON_DOWN){
            printf("Right button pressed\n");
        }   */   
        x += getMouse_displacement_x(string[0],string[1]);
        if(x > 280){
            x = 280;
        }
        if(x < 50){
            x = 50;
        }
        y += getMouse_displacement_y(string[0],string[2]) / 10;
        if(y > 200){
            y = 200;
        }
        if(y < 50){
            y = 50;
        }
        setCursorPosition(x,y);   
    }
    else{
        alt_up_ps2_clear_fifo(context);
    }
}    

int main()
{
    init();
    setColor(GUI_BLACK);
    setCursorPosition(50,50);
    alt_up_ps2_dev* mouse;
    //打开鼠标设备
    mouse = alt_up_ps2_open_dev("/dev/ps2_0");
    //禁用timeout
    mouse->timeout = 0;
    //初始化
    alt_up_ps2_init(mouse);
    //复位
    alt_up_ps2_mouse_reset(mouse);
    //清FIFO 
    alt_up_ps2_clear_fifo(mouse);
    //设置数据接收有效 让鼠标状态返回
    alt_up_ps2_mouse_set_mode(mouse, MOUSE_ENABLE_DATA_REPORTING);
    //重新设置采样率 设为10
    alt_up_ps2_mouse_set_mode(mouse, MOUSE_SET_SAMPLE_RATE); 
    alt_up_ps2_mouse_set_mode(mouse, 10); 
    //设置分辨率 设为2count/mm
    alt_up_ps2_mouse_set_mode(mouse, MOUSE_SET_RESOLUTION); 
    alt_up_ps2_mouse_set_mode(mouse, 0x02); 
    //开中断
    IOWR_ALT_UP_PS2_PORT_CONTROL(PS2_0_BASE,0x01);                               
    //启动流模式
    alt_up_ps2_mouse_set_mode(mouse, MOUSE_STREAM_MODE);
    //查看设备信息
    alt_up_ps2_mouse_set_mode(mouse, MOUSE_REQUEST_STATUS);
    int j;
    alt_u8 temp;
    for(j = 0;j < 3;j++){ 
        alt_up_ps2_read_data_byte(mouse,&temp);
        printf("%x\n",temp);
    }
    //注册中断
    int i = alt_irq_register(PS2_0_IRQ,mouse,handle_mouse_interrupts);
    while(1){
    }
    return 0;
}