ARM小键盘、LED、BEEP驱动

最新推荐文章于 2024-03-15 22:54:08 发布

原创最新推荐文章于 2024-03-15 22:54:08 发布 · 601 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#output #import

代码专栏收录该内容

6 篇文章

订阅专栏

本文介绍了一个简单的嵌入式系统编程实例，通过编写驱动程序实现LED灯控制及按键扫描功能。文中详细展示了如何定义寄存器地址、初始化GPIO口、读取按键状态以及控制LED灯亮灭等关键步骤。

第一次写驱动哦

main.c

#define CPLD_LED		(*(volatile unsigned char *)0x20800000)

#define GPBCON			(*(volatile unsigned int *)0x56000010)

#define GPBDAT			(*(volatile unsigned int *)0x56000014)

#define WTCON			(*(volatile unsigned int *)0x53000000)

#define GPFCON			(*(volatile unsigned int *)0x56000050)

#define GPFDAT			(*(volatile unsigned int *)0x56000054)

#define SEG     		(*(volatile unsigned char *)0x20800010)



int key_init(void)

{

	/* GPB8 output */

	GPBCON |= 1<<16;

	GPBCON &= ~(1<<17);

	/* GPB9 output */

	GPBCON |= 1<<18;

	GPBCON &= ~(1<<19);



	return 0;

}



int key_num(void)

{

	/* scan first column */

	GPBDAT &= ~(1<<8);

	GPBDAT |= 1<<9;

	if ((GPFDAT & (1<<0)) == 0)

		return 1;

	if((GPFDAT & (1<<2)) == 0)

		return 3;

		

	/* scan second column */

	GPBDAT |= 1<<8;

	GPBDAT &= ~(1<<9);

	if ((GPFDAT & (1<<0)) == 0)

		return 2;

	if((GPFDAT & (1<<2)) == 0)

		return 4;



	return 0;

}



int led_on(int num)

{

	CPLD_LED |= 1<<num;

	

	return 0;

}



int led_off_all(void)

{

	CPLD_LED &= 0x0;

	

	return 0;

}



void beep_on(void)

{

	

	GPBDAT |= 1<<0;

}



void beep_off(void)

{

	

	GDPDAT &= ~(1<<0);

}



void seg_show(void)

{

	if((GDPDAT &= (1<<0)) == 1)

	{

		SEG = 0x7f;

	}else{

		SEG = 0x3f;

	}

	

}

void my_sleep(void)

{

	int i ,j;

	for(i = 0; i < 100; i++)

		for(j = 0; j < 1000; j++ )

}



int Main(void)

{

	int key;

	GPBCON = 0x1;

	GPBDAT = 0x0;

	

	WTCON = 0x0;



	CPLD_LED = 0xf;

	

	key_init();

	while (1)

	{

		key = key_num();

		

		switch(key)

		{

			case 1:led_on(0);

					beep_on();

					break;

			case 2:led_on(1);

					beep_off();

					break;

			case 3:led_on(2);

					beep_on();

					my_sleep();

					beep_off();

					break;

			case 4:led_on(3);

					seg_show();

					break;

			default:

					led_off_all();		

		}

	}

	

	return 0;

}
stat,c

AREA swn_test, CODE, READONLY 
    export start 
    import Main 
start 
    mov sp, #0x0ff 
    bl Main 
     
    END