在Tiny210v2上实现四线电阻屏触摸，有兴趣的朋友可以看看

我54123 · 发表于 2016-9-6 18:17:31

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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
",++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
",(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
");

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
");

//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");

[table=100%,#ffffff]MODULE_LICENSE("GPL");
[/table][/hide]

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xzcxnihd · 发表于 2016-9-6 19:14:46

谢谢楼主分享

ruili · 发表于 2016-9-7 08:53:00

你的原创吗

bao770119 · 发表于 2017-4-26 10:02:31

参考一下

xintaisniper · 发表于 2020-3-3 14:19:44

感谢分享。。。

tiny2010 · 发表于 2020-9-10 08:38:15

tiny2010 · 发表于 2020-9-14 09:00:09

tiny2010 · 发表于 2020-9-15 08:54:37

tiny2010 · 发表于 2020-12-23 08:57:34

tiny2010 · 发表于 2020-12-24 08:47:36

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