S3C2440裸机------触摸屏_定时候程序优化

我们前面的触摸屏代码中，当我们短按一次会有一个数据输出，但是当我们长按或者滑动时并没有数据输出，我们用定时器使触摸屏支持长按，在按下时我们启动定时器，定时器间隔一段时间中断一次，然后在中断函数里面再去测量触点的XY坐标。

我们前面的定时器代码是直接在定时器中断函数里面点灯，我们应该用一个数组去做处理，当定时器中断发生时分别进入不同的函数做不同的处理。

1. timer.c

#include "s3c2440_soc.h"

#define TIMER_NUM  32

#define NULL  ((void *)0)

typedef void(*timer_func)(void);

typedef struct timer_desc {

char *name;

timer_func fp;

}timer_desc, *p_timer_desc;

timer_desc timer_array[TIMER_NUM];

int register_timer(char *name, timer_func fp)

{

int i;

for (i = 0; i < TIMER_NUM; i++)

{

if (!timer_array[i].fp)

{

timer_array[i].name = name;

timer_array[i].fp   = fp;

return 0;

}

}

return -1;

}

void unregister_timer(char *name)

{

int i;

for (i = 0; i < TIMER_NUM; i++)

{

if (!strcmp(timer_array[i].name, name))

{

timer_array[i].name = NULL;

timer_array[i].fp   = NULL;

return 0;

}

}

return -1;

}

void timer_irq(void)

{

int i;

for (i = 0; i < TIMER_NUM; i++)

{

if (timer_array[i].fp)

{

timer_array[i].fp();

}

}

}

void timer_init(void)

{

/* 设置TIMER0的时钟 */

/* Timer clk = PCLK / {prescaler value+1} / {divider value} 

             = 50000000/(49+1)/16

             = 62500

*/

TCFG0 = 49;  /* Prescaler 0 = 49, 用于timer0,1 */

TCFG1 &= ~0xf;

TCFG1 |= 3;  /* MUX0 : 1/16 */

/* 设置TIMER0的初值 */

TCNTB0 = 625;  /* 10Ms中断一次 */

/* 加载初值, 启动timer0 */

TCON |= (1<<1);   /* Update from TCNTB0 & TCMPB0 */

/* 设置为自动加载并启动 */

TCON &= ~(1<<1);

TCON |= (1<<0) | (1<<3);  /* bit0: start, bit3: auto reload */

/* 设置中断 */

register_irq(10, timer_irq);

}

2. led.c

#include "s3c2440_soc.h"

void delay(volatile int d)

{

while (d--);

}

/* 每10ms该函数被调用一次 

 * 每500ms操作一下LED实现计数

 */

void led_timer_irq(void)

{

/* 点灯计数 */

static int timer_num = 0;

static int cnt = 0;

int tmp;

timer_num++;

if (timer_num < 50)

return;

timer_num = 0;

cnt++;

tmp = ~cnt;

tmp &= 7;

GPFDAT &= ~(7<<4);

GPFDAT |= (tmp<<4);

}

int led_init(void)

{

/* 设置GPFCON让GPF4/5/6配置为输出引脚 */

GPFCON &= ~((3<<8) | (3<<10) | (3<<12));

GPFCON |=  ((1<<8) | (1<<10) | (1<<12));

register_timer("led", led_timer_irq);

}

int led_test(void)

{

int val = 0;  /* val: 0b000, 0b111 */

int tmp;

/* 设置GPFCON让GPF4/5/6配置为输出引脚 */

GPFCON &= ~((3<<8) | (3<<10) | (3<<12));

GPFCON |=  ((1<<8) | (1<<10) | (1<<12));

/* 循环点亮 */

while (1)

{

tmp = ~val;

tmp &= 7;

GPFDAT &= ~(7<<4);

GPFDAT |= (tmp<<4);

delay(100000);

val++;

if (val == 8)

val =0;

}

return 0;

}