移植移植infoNES模擬器到嵌入式linux上,並增加支持聲音輸出和按鍵
代碼放在了github上。
https://github.com/yongzhena/infoNES
先來個效果截圖:
按鍵驅動源碼:
#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 鍵位對應關係 真實手柄中有一個定時器,處理 連A 連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 手柄鍵值
//buf 是有符號無法保存 8 bit
int 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;
//註冊驅動程序
int joypad_drv_init(void)
{
printk(KERN_INFO "joypad_drv_init\n");
major = register_chrdev(0, "joypad_drv", &joypad_drv_fops);
//自動創建 dev 節點
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配置爲輸入
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;
}
//卸載驅動程序
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");
編譯驅動爲joypad.ko的makefile:
KERN_DIR = /mnt/hgfs/b503/imax283/linux-2.6.35.3
all:
make -C $(KERN_DIR) M=`pwd` modules
clean:
make -C $(KERN_DIR) M=`pwd` modules clean
rm -rf modules.order
obj-m += joypad.o
加載驅動的方法:
insmod joypad.ko
卸載驅動方法:
rmmod joypad.ko