WhyCan Forum(哇酷开发者社区)

//带unexport的代码
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#define GPIO_PATH "/sys/class/gpio"
#define GPIO_EXPORT_FILE GPIO_PATH "/export"
#define GPIO_UNEXPORT_FILE GPIO_PATH "/unexport"
#define GPIO_EDGE_FILE "edge"
#define GPIO_VALUE_FILE "value"

int export_gpio(int gpio_num) {
    char buffer[4];
    int fd = open(GPIO_EXPORT_FILE, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open export for write");
        return -1;
    }
    snprintf(buffer, sizeof(buffer), "%d", gpio_num);
    write(fd, buffer, strlen(buffer));
    close(fd);
    return 0;
}

int set_gpio_direction(int gpio_num, const char *direction) {
    char path[64];
    snprintf(path, sizeof(path), GPIO_PATH "/gpio%d/direction", gpio_num);
    int fd = open(path, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open direction for write");
        return -1;
    }
    write(fd, direction, strlen(direction));
    close(fd);
    return 0;
}

int set_gpio_edge(int gpio_num, const char *edge) {
    char path[64];
    snprintf(path, sizeof(path), GPIO_PATH "/gpio%d/%s", gpio_num, GPIO_EDGE_FILE);
    int fd = open(path, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open edge for write");
        return -1;
    }
    write(fd, edge, strlen(edge));
    close(fd);
    return 0;
}

int is_gpio_exported(int gpio_num)
{
     char path[64];
     snprintf(path, sizeof(path), GPIO_PATH "/gpio%d", gpio_num);
     return !access(path, F_OK);
}
int main() {
    int gpio_fd, ret;
    struct pollfd fds[1];
    int gpio_num = 23; // Replace with your GPIO number
    if ()
    {
         //这里要unexport下
        int unexport_fd = open(GPIO_UNEXPORT_FILE, O_WRONLY);
        if (unexport_fd >= 0) {
        char buffer[4];
        snprintf(buffer, sizeof(buffer), "%d", gpio_num);
        write(unexport_fd, buffer, strlen(buffer));
        close(unexport_fd);
    }
    }
    // Export GPIO and set direction and edge
    if (export_gpio(gpio_num) < 0)
        return 1;
    if (set_gpio_direction(gpio_num, "in") < 0)
        return 1;
    if (set_gpio_edge(gpio_num, "rising") < 0)
        return 1;

    // Open value file for reading
    char value_path[64];
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/%s", gpio_num, GPIO_VALUE_FILE);
    gpio_fd = open(value_path, O_RDONLY | O_NONBLOCK);
    if (gpio_fd < 0) {
        perror("Failed to open value for read");
        return 1;
    }

    // Setup poll structure
    fds[0].fd = gpio_fd;
    fds[0].events = POLLPRI;

    while (1) {
        ret = poll(fds, 1, -1); // Wait indefinitely for event
        if (ret == -1) {
            if (errno == EINTR)
                continue;
            perror("poll");
            break;
        } else if (ret == 0) {
            printf("Timeout occurred!?\n");
            continue;
        }

        if (fds[0].revents & POLLPRI) {
            // Read the value to clear the interrupt
            lseek(gpio_fd, 0, SEEK_SET);
            char value_str[32];
            read(gpio_fd, value_str, sizeof(value_str));

            printf("Interrupt detected on GPIO %d\n", gpio_num);

            // Process the interrupt here...

            // Break after processing one interrupt for demonstration purposes
            break;
        }
    }

    // Cleanup
    close(gpio_fd);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/value", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/edge", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/direction", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d", gpio_num);
    rmdir(value_path);
    //这里要unexport下
    int unexport_fd = open(GPIO_UNEXPORT_FILE, O_WRONLY);
    if (unexport_fd >= 0) {
        char buffer[4];
        snprintf(buffer, sizeof(buffer), "%d", gpio_num);
        write(unexport_fd, buffer, strlen(buffer));
        close(unexport_fd);
    }

    return 0;
}

//没有执行unexport的代码
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#define GPIO_PATH "/sys/class/gpio"
#define GPIO_EXPORT_FILE GPIO_PATH "/export"
#define GPIO_EDGE_FILE "edge"
#define GPIO_VALUE_FILE "value"

int export_gpio(int gpio_num) {
    char buffer[4];
    int fd = open(GPIO_EXPORT_FILE, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open export for write");
        return -1;
    }
    snprintf(buffer, sizeof(buffer), "%d", gpio_num);
    write(fd, buffer, strlen(buffer));
    close(fd);
    return 0;
}

int set_gpio_direction(int gpio_num, const char *direction) {
    char path[64];
    snprintf(path, sizeof(path), GPIO_PATH "/gpio%d/direction", gpio_num);
    int fd = open(path, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open direction for write");
        return -1;
    }
    write(fd, direction, strlen(direction));
    close(fd);
    return 0;
}

int set_gpio_edge(int gpio_num, const char *edge) {
    char path[64];
    snprintf(path, sizeof(path), GPIO_PATH "/gpio%d/%s", gpio_num, GPIO_EDGE_FILE);
    int fd = open(path, O_WRONLY);
    if (fd < 0) {
        perror("Failed to open edge for write");
        return -1;
    }
    write(fd, edge, strlen(edge));
    close(fd);
    return 0;
}

int main() {
    int gpio_fd, ret;
    struct pollfd fds[1];
    int gpio_num = 23; // Replace with your GPIO number

    // Export GPIO and set direction and edge
    if (export_gpio(gpio_num) < 0)
        return 1;
    if (set_gpio_direction(gpio_num, "in") < 0)
        return 1;
    if (set_gpio_edge(gpio_num, "rising") < 0)
        return 1;

    // Open value file for reading
    char value_path[64];
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/%s", gpio_num, GPIO_VALUE_FILE);
    gpio_fd = open(value_path, O_RDONLY | O_NONBLOCK);
    if (gpio_fd < 0) {
        perror("Failed to open value for read");
        return 1;
    }

    // Setup poll structure
    fds[0].fd = gpio_fd;
    fds[0].events = POLLPRI;

    while (1) {
        ret = poll(fds, 1, -1); // Wait indefinitely for event
        if (ret == -1) {
            if (errno == EINTR)
                continue;
            perror("poll");
            break;
        } else if (ret == 0) {
            printf("Timeout occurred!?\n");
            continue;
        }

        if (fds[0].revents & POLLPRI) {
            // Read the value to clear the interrupt
            lseek(gpio_fd, 0, SEEK_SET);
            char value_str[32];
            read(gpio_fd, value_str, sizeof(value_str));

            printf("Interrupt detected on GPIO %d\n", gpio_num);

            // Process the interrupt here...

            // Break after processing one interrupt for demonstration purposes
            break;
        }
    }

    // Cleanup
    close(gpio_fd);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/value", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/edge", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d/direction", gpio_num);
    unlink(value_path);
    snprintf(value_path, sizeof(value_path), GPIO_PATH "/gpio%d", gpio_num);
    rmdir(value_path);

    return 0;
}

 __exidx_start = .;
    .ARM.exidx   :
    {
        *(.ARM.exidx* .gnu.linkonce.armexidx.*) 
        _sidata = .;
    }
    __exidx_end = .;

    __rodata_start = .;
    .rodata   : { *(.rodata) *(.rodata.*) }
    __rodata_end = .;

    . = ALIGN(4);
    .ctors :
    {
        PROVIDE(__ctors_start__ = .);
        KEEP(*(SORT(.ctors.*)))
        KEEP(*(.ctors))
        KEEP (*(SORT(.init_array.*)))
        KEEP (*(.init_array))
        PROVIDE(__ctors_end__ = .);
    }
   
    . = ALIGN(4);

    .dtors :
    {
        PROVIDE(__dtors_start__ = .);
        KEEP(*(SORT(.dtors.*)))
        KEEP(*(.dtors))
        PROVIDE(__dtors_end__ = .);
    }
    . = ALIGN(4);

ratio=f -2143974832 0
Build at: Apr 22 2021 18:08:48
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x1:0,y1:0,x2:239,y2:319
nr:76800
x1:0,y1:0,x2:239,y2:319
nr:76800
x1:6,y1:76,x2:239,y2:202
nr:29718
x1:6,y1:76,x2:239,y2:202
nr:29718
x1:6,y1:76,x2:239,y2:202
nr:29718

MACRO
	fetch $count			   ;//提取操作码	;$标号 宏名 $参数1，$参数2，...
;//---------------------------------------------------------------------
	ldr r0,clocksh			   ;//处理apu需要的时钟数
	add r0,r0,#$count
	str r0,clocksh

	ldr r1,opz            ;//获取代码跳转表地址
;//-------------------------------------------------------------------------
	subs cycles,cycles,#$count*256;//CYCLE=256 ;//	3*256 正数或0就执行下2条指令  
	ldrplb r0,[m6502_pc],#1			   ; //从存储器中加载字节到一个寄存器中	 r0=操作码
;	ldrpl pc,[m6502_optbl,r0,lsl#2]	  ;//r10 ********r0=r0x4***运行代码的地址**************************************
	ldrpl pc,[r1,r0,lsl#2]
	ldr pc,nexttimeout
	MEND

.macro fetch count	
			   //提取操作码	//$标号 宏名 $参数1，$参数2，...
//---------------------------------------------------------------------
	ldr r0,clocksh			   //处理apu需要的时钟数
	add r0,r0,#\count
	str r0,clocksh

	ldr r1,opz            //获取代码跳转表地址
//-------------------------------------------------------------------------
	subs cycles,cycles,#\count*256   //CYCLE=256 ////	3*256 正数或0就执行下2条指令  
	ldrplb r0,[m6502_pc],#1			   //从存储器中加载字节到一个寄存器中	 r0=操作码
//	ldrpl pc,[m6502_optbl,r0,lsl#2]	  //r10 ********r0=r0x4***运行代码的地址**************************************
	ldrpl pc,[r1,r0,lsl#2]
	ldr pc,nexttimeout
.endm

C EQU 0x01	;//6502 flags  6502标志
Z EQU 0x02
I EQU 0x04
D EQU 0x08
B EQU 0x10	;//(allways 1 except when IRQ pushes it)IRQ外部中断
R EQU 0x20	;//(locked at 1)
V EQU 0x40
N EQU 0x80

.equ C , 0x01 //6502 flags  6502标志
.equ Z , 0x02
.equ I , 0x04
.equ D , 0x08
.equ B , 0x10 //(allways 1 except when IRQ pushes it)IRQ外部中断
.equ R , 0x20
.equ V , 0x40 //(locked at 1)
.equ N , 0x80

_type	SETA      _ABS

.equ _type , _ABS

cpu6502_init PROC
;----------------------------------------------------------------------------
stmfd sp!,{r4-r11,lr}
ldr r10,=cpu_data	;读取地址
ldr r11,=NES_RAM	;r11=cpu_zpage

.text
.global cpu6502_init
.type cpu6502_init, %function
.align 8
cpu6502_init:
//----------------------------------------------------------------------------
stmfd sp!,{r4-r11,lr}		
ldr r10,=cpu_data	//读取地址
ldr r11,=NES_RAM	//r11=cpu_zpage	
ldr r11,[r11]       //NES_RAM用了指针 

globalptr	RN r10

globalptr .req r10

ldmfd sp!,{r3,lr}
//orr lr,#0x01		//lr最低位置1防止进入arm状态 //F1C100s 本来就是arm状态，需要注释掉这个指令 --By VeiLiang 

u8 PADdata0 __attribute__ ((aligned (8)));  			//手柄1键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0  
u8 PADdata1 __attribute__ ((aligned (8)));   			//手柄2键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0  
u8 *NES_RAM __attribute__ ((aligned (8)));			//保持1024字节对齐
u8 *NES_SRAM __attribute__ ((aligned (8)));  
u8* spr_ram __attribute__ ((aligned (8)));			//精灵RAM,256字节

//读取游戏手柄数据
void nes_get_gamepadval(void)
{  
	// u8 *pt;
	// while((usbx.bDeviceState&0XC0)==0X40)//USB设备插入了,但是还没连接成功,猛查询.
	// {
	// 	usbapp_pulling();	//轮询处理USB事务
	// }
	// usbapp_pulling();		//轮询处理USB事务
	// if(usbx.hdevclass==4)	//USB游戏手柄
	// {	
	// 	PADdata0=fcpad.ctrlval;
	// 	PADdata1=0;
	// }else if(usbx.hdevclass==3)//USB键盘模拟手柄
	// {
	// 	KEYBRD_FCPAD_Decode(pt,0);
	// 	PADdata0=fcpad.ctrlval;
	// 	PADdata1=fcpad1.ctrlval; 
	// }	
}