玩转easyARM imax283A开发版(二)，移植NES模拟器并增加按键驱动，让板子可以玩超级玛丽游戏

news/2025/2/13 2:51:20/

移植移植infoNES模拟器到嵌入式linux上，并增加支持声音输出和按键

代码放在了github上。

https://github.com/yongzhena/infoNES

先来个效果截图：

按键驱动源码：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <linux/device.h>
#include <../arch/arm/mach-mx28/mx28_pins.h>
#include "gpio.h"static struct class *joypad_drv_class;/*** FC手柄 bit 键位对应关系 真实手柄中有一个定时器，处理 连A  连B * 0  1   2       3       4    5      6     7* A  B   Select  Start  Up   Down   Left  Right
*/
static ssize_t joypad_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{//利用 sszie_t 返回 手柄键值 //buf 是有符号无法保存 8 bitint i;ssize_t val = 0;if(!gpio_get_value(MXS_PIN_TO_GPIO(PINID_SSP0_DATA6))){//printk(KERN_INFO "key1 pressed!\n");val = 1<<0; //A}else{//printk(KERN_INFO "no key pressed!\n");}if(!gpio_get_value(MXS_PIN_TO_GPIO(PINID_SSP0_DATA5))){//printk(KERN_INFO "key2 pressed!\n");val = 1<<6;//LEFT}if(!gpio_get_value(MXS_PIN_TO_GPIO(PINID_SSP0_DATA4))){//printk(KERN_INFO "key3 pressed!\n");val = 1<<3;//start}if(!gpio_get_value(MXS_PIN_TO_GPIO(PINID_LCD_D18))){//printk(KERN_INFO "key4 pressed!\n");val = 1<<7;//RIGHT}if(!gpio_get_value(MXS_PIN_TO_GPIO(PINID_LCD_D17))){//printk(KERN_INFO "key5 pressed!\n");val = 1<<5;//UP}return val;
}
static struct file_operations joypad_drv_fops = {.owner  =   THIS_MODULE,.read   =   joypad_drv_read,
};int major;
//注册驱动程序
int joypad_drv_init(void)
{printk(KERN_INFO "joypad_drv_init\n");major = register_chrdev(0, "joypad_drv", &joypad_drv_fops);//自动创建 dev 节点joypad_drv_class = class_create(THIS_MODULE, "joypad_drv");device_create(joypad_drv_class, NULL, MKDEV(major, 0), NULL, "joypad");//P3.26 PINID_SAIF1_SDATA0配置为输入gpio_direction_input(MXS_PIN_TO_GPIO(PINID_SAIF1_SDATA0));gpio_direction_input(MXS_PIN_TO_GPIO(PINID_LCD_D17));gpio_direction_input(MXS_PIN_TO_GPIO(PINID_LCD_D18));gpio_direction_input(MXS_PIN_TO_GPIO(PINID_SSP0_DATA4));gpio_direction_input(MXS_PIN_TO_GPIO(PINID_SSP0_DATA5));gpio_direction_input(MXS_PIN_TO_GPIO(PINID_SSP0_DATA6));return 0;
}//卸载驱动程序
void joypad_drv_exit(void)
{printk(KERN_INFO "joypad_drv_exit\n");unregister_chrdev(major, "joypad_drv");device_destroy(joypad_drv_class, MKDEV(major, 0));class_destroy(joypad_drv_class);
}module_init(joypad_drv_init);
module_exit(joypad_drv_exit);
MODULE_LICENSE("GPL");

编译驱动为joypad.ko的makefile:

KERN_DIR = /mnt/hgfs/b503/imax283/linux-2.6.35.3all:make -C $(KERN_DIR) M=`pwd` modules clean:make -C $(KERN_DIR) M=`pwd` modules cleanrm -rf modules.orderobj-m	+= joypad.o

加载驱动的方法：

insmod joypad.ko