主题 : 在Tiny210v2上实现四线电阻屏触摸,有兴趣的朋友可以看看 复制链接 | 浏览器收藏 | 打印
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楼主  发表于: 2013-08-13 20:52

 在Tiny210v2上实现四线电阻屏触摸,有兴趣的朋友可以看看

管理提醒: 本帖被 xoom 执行加亮操作(2013-08-14)
Tiny210v2上没有四线电阻屏的接口,可直接从核心板上引出四根线连接至四线电阻屏,下面为四线电阻屏的驱动源码,我已经在Tiny210v2上测试OK。有兴趣的朋友可以看看。
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include <mach/map.h>
#include <mach/regs-clock.h>
#include <mach/regs-adc.h>
#include <mach/regs-gpio.h>
#include <plat/regs-timer.h>


struct tiny210_ts_regs{
    unsigned long tsadccon1;
    unsigned long tscon1;
    unsigned long tsdly1;
    unsigned long tsdatx1;
    unsigned long tsdaty1;
    unsigned long tspenstat1;
    unsigned long clrintadc1;
    unsigned long noregs;
    unsigned long clrintpen1;
};

struct tiny210_ts_regs_1{
    unsigned long tsadccon0;
    unsigned long tscon0;
    unsigned long tsdly0;
    unsigned long tsdatx0;
    unsigned long tsdaty0;
    unsigned long tspenstat0;
    unsigned long clrintadc0;
    unsigned long adcmux;
    unsigned long clrintpen0;
};

static struct input_dev *tiny210_ts_dev;

static volatile struct tiny210_ts_regs *tiny210_ts_regs;
static volatile struct tiny210_ts_regs_1*tiny210_ts_regs_1;

static struct timer_list ts_timer;

static void enter_wait_pen_down_mode(void)
{
    tiny210_ts_regs->tscon1 = 0xd3;
}

static void enter_wait_pen_up_mode(void)
{
    tiny210_ts_regs->tscon1 = 0x1d3;
}

static void enter_measure_xy_mode(void)
{
    tiny210_ts_regs->tscon1 = (1<<3) | (1<<2);
}

static void start_adc(void)
{
    tiny210_ts_regs->tsadccon1 |= (1<<0);
}

static int tiny210_filter_ts(int x[], int y[])
{
#define ERR_LIMIT 50
    int avr_x, avr_y;
    int det_x, det_y;

    avr_x = (x[0]+x[1])/2;
    avr_y = (y[0]+y[1])/2;

    det_x = (x[2] > avr_x) ? (x[2] - avr_x) : (avr_x - x[2]);
    det_y = (y[2] > avr_y) ? (y[2] - avr_y) : (avr_y - y[2]);

    if((det_x > ERR_LIMIT) || (det_y > ERR_LIMIT))
        return 0;

    avr_x = (x[1] + x[2])/2;
    avr_y = (y[1] + y[2])/2;

    det_x = (x[3] > avr_x) ? (x[3] - avr_x) : (avr_x - x[3]);
    det_y = (y[3] > avr_y) ? (y[3] - avr_y) : (avr_y - y[3]);

    if((det_x > ERR_LIMIT) || (det_y > ERR_LIMIT))
        return 0;

    return 1;
}

static void tiny210_ts_timer_function(unsigned long data)
{
    if(tiny210_ts_regs->tsdatx1 & (1<<15))
        {
            input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
            input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
            input_sync(tiny210_ts_dev);
            enter_wait_pen_down_mode();
        }
    else
        {
            enter_measure_xy_mode();
            start_adc();
        }
}

static irqreturn_t adc_irq(int irq, void *dev_id)
{
    tiny210_ts_regs->clrintadc1 = 0;
    static int cnt = 0;
    static int x[4], y[4];
    int adcdatx,adcdaty;
    
    adcdatx = tiny210_ts_regs->tsdatx1;
    adcdaty = tiny210_ts_regs->tsdaty1;

    if(tiny210_ts_regs->tsdatx1 & (1<<15))
        {
            cnt = 0;
            input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
            input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
            input_sync(tiny210_ts_dev);
            enter_wait_pen_down_mode();
        }
    else
        {
            //printk("adc_irq cnt = %d, x = %d, y = %d\n",++cnt,adcdatx & 0xfff, adcdaty & 0xfff);
            x[cnt] = adcdatx & 0xfff;
            y[cnt] = adcdaty & 0xfff;
            ++cnt;

            if(cnt == 4)
                {
                    if(tiny210_filter_ts(x,y))
                        {
                            //printk("x = %d, y = %d\n",(x[0]+x[1]+x[2]+x[3])/4, (y[0]+y[1]+y[2]+y[3])/4);
                            input_report_abs(tiny210_ts_dev, ABS_X, (x[0]+x[1]+x[2]+x[3])/4);
                            input_report_abs(tiny210_ts_dev, ABS_Y, (y[0]+y[1]+y[2]+y[3])/4);
                            input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 1);
                            input_report_key(tiny210_ts_dev, BTN_TOUCH, 1);
                            input_sync(tiny210_ts_dev);
                        }
                    cnt = 0;
                    enter_wait_pen_up_mode();
                }
            else
                {
                    enter_measure_xy_mode();
                    start_adc();
                }
        }
    return IRQ_HANDLED;
}

static irqreturn_t pen_down_up_irq(int irq, void *dev_id)
{
    tiny210_ts_regs->clrintpen1 = 0;
    if(tiny210_ts_regs->tsdatx1 & (1<<15))
        {
            //printk("pen up\n");
            input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
            input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
            input_sync(tiny210_ts_dev);
            enter_wait_pen_down_mode();
        }
    else
        {
            //printk("pen down\n");
            //enter_wait_pen_up_mode();
            enter_measure_xy_mode();
            start_adc();
        }
    return IRQ_HANDLED;
}

static int tiny210_ts_init(void)
{
    struct clk* clk;
    
    tiny210_ts_dev = input_allocate_device();
    
    set_bit(EV_KEY, tiny210_ts_dev->evbit);
    set_bit(EV_ABS, tiny210_ts_dev->evbit);

    set_bit(BTN_TOUCH, tiny210_ts_dev->keybit);

    input_set_abs_params(tiny210_ts_dev, ABS_X, 0, 0xfff, 0, 0);
    input_set_abs_params(tiny210_ts_dev, ABS_Y, 0, 0xfff, 0, 0);
    input_set_abs_params(tiny210_ts_dev, ABS_PRESSURE, 0, 1, 0, 0);

    input_register_device(tiny210_ts_dev);

    tiny210_ts_regs_1= ioremap(0xE1700000, sizeof(struct tiny210_ts_regs_1));
    tiny210_ts_regs = ioremap(0xE1701000,sizeof(struct tiny210_ts_regs));

    clk = clk_get(NULL, "adc");
    clk_enable(clk);

       tiny210_ts_regs_1->tsadccon0 |= (1<<17);
    tiny210_ts_regs->tsadccon1 &= ~(1<<2);
    tiny210_ts_regs->tsadccon1 = (1<<14) | (1<<16) |(65<<6);
  
    request_irq(IRQ_PENDN1, pen_down_up_irq, IRQF_SAMPLE_RANDOM, "ts_pen", NULL);
    request_irq(IRQ_ADC1, adc_irq, IRQF_SAMPLE_RANDOM, "adc", NULL);
    
    tiny210_ts_regs->tsdly1 = 0xffff;

    init_timer(&ts_timer);
    ts_timer.function = tiny210_ts_timer_function;
    add_timer(&ts_timer);
    
    enter_wait_pen_down_mode();
    
    return 0;
}

static void tiny210_ts_exit(void)
{
    input_unregister_device(tiny210_ts_dev);
    input_free_device(tiny210_ts_dev);
    iounmap(tiny210_ts_regs);
    iounmap(tiny210_ts_regs_1);
    free_irq(IRQ_PENDN1, NULL);
    free_irq(IRQ_ADC1, NULL);
    del_timer(&ts_timer);
}

module_init(tiny210_ts_init);
module_exit(tiny210_ts_exit);
MODULE_AUTHOR("jany_linux");
MODULE_LICENSE("GPL");
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注册时间: 2013-12-19
最后登录: 2014-02-28
1楼  发表于: 2013-12-19 15:54
不错,有反应了,就是位置不对,再加上校准应该就可以了,非常感谢!
http://www.rosoo.net/a/201006/9649.html
移植的时候还参考了这篇文章。