PC：Windows 10

虛擬機(jī)：ubuntu 16.04

vivado：2017.04

的的PetaLinux：2017.04

開(kāi)發(fā)板：黑金AX7010

根文件系統(tǒng)：debian8

-------------------------------------------------- --------------------傳說(shuō)中的分割線------------------------- -------------------------------------------------- ----

將? zynq linux驅(qū)動(dòng)之傳統(tǒng)開(kāi)發(fā) ?里的vivado工程另存為interrupt7010

接下來(lái)配置一下中斷

這里會(huì)出現(xiàn)中斷的接口

接下來(lái)添加一個(gè)引腳

連起來(lái)

重新生成一下頂層文件

打開(kāi)頂層文件，加一個(gè)非門(mén)(因?yàn)镻S這邊貌似只支持上升沿中斷和高電平中斷)

在約束文件里面添加觸發(fā)IRQ的引腳(這里用的是KEY4，HDMI座子旁邊的那個(gè)按鍵)

執(zhí)行生成位文件

結(jié)束之后將原來(lái)的SDK目錄刪掉

重新導(dǎo)入硬件和位文件之后打開(kāi)SDK

將該文件夾拷貝到Ubuntu的里

使用的PetaLinux編譯fsbl，u-boot的，內(nèi)核，設(shè)備樹(shù)文件：

過(guò)程略.....

用的PetaLinux制作BOOT.BIN文件，將BOOT.BIN，image.ub，system.dtb文件拷貝到SD卡的胖分區(qū)里(這里沒(méi)有用的PetaLinux生成的根文件系統(tǒng)，用的是debian8)

接下來(lái)打開(kāi)數(shù)據(jù)表

找到中斷號(hào)是61

然后先到開(kāi)板上看一下

cat /proc/interrupts

再看看數(shù)據(jù)表上

沒(méi)有問(wèn)題中斷號(hào)都對(duì)得上

然后再來(lái)看看設(shè)備樹(shù)

vim components/plnx_workspace/device-tree/device-tree-generation/zynq-7000.dtsi

發(fā)現(xiàn)這里的中斷號(hào)跟數(shù)據(jù)表和/ PROC /中斷里面的對(duì)不上

仔細(xì)觀察發(fā)現(xiàn)設(shè)備樹(shù)里面的中斷號(hào)是數(shù)據(jù)表上的中斷號(hào)減去32得到的值

接下來(lái)仿照這個(gè)寫(xiě)一個(gè)自己的

vim project-spec/meta-user/recipes-bsp/device-tree/files/system-user.dtsi

/include/ "system-conf.dtsi"

/ {

amba_pl: amba_pl{

#address-cells = <1>;

#size-cells = <1>;

compatible = "simple-bus";

ranges;

irq: irq@0{

compatible = "hello,irq";

interrupt-parent = ;

interrupts = <0 29 2>;

};

};

};

執(zhí)行的PetaLinux建造編譯

編譯完成之后

到開(kāi)發(fā)板上，掛接NFS文件系統(tǒng)，然后把編譯好的設(shè)備樹(shù)文件(system.dts)拷貝到開(kāi)發(fā)板SD卡的脂肪分區(qū)里，重啟開(kāi)發(fā)板

ls /proc/device-tree/amba_pl/

可以看到設(shè)備樹(shù)節(jié)點(diǎn)增加了IRQ @ 0

編寫(xiě)驅(qū)動(dòng)：

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include /* error codes */

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

//

static char devname[16];

static int major;

static int mijor;

static struct class* cls;

static void __iomem* base_address;

static resource_size_t remap_size;

static int irq;

static struct device* dev;

//

#define DEVICE_NAME "irq_drv"

static volatile int irq_is_open = 0;

static struct fasync_struct *irq_async;

static int irq_drv_open(struct inode *Inode, struct file *File)

{

irq_is_open = 1;

return 0;

}

int irq_drv_release (struct inode *inode, struct file *file)

{

irq_is_open = 0;

return 0;

}

static ssize_t irq_drv_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)

{

return 0;

}

static ssize_t irq_drv_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)

{

return 0;

}

static int irq_drv_fasync (int fd, struct file *filp, int on)

{

return fasync_helper (fd, filp, on, &irq_async);

}

static struct file_operations irq_fops = {

.owner = THIS_MODULE,

.open = irq_drv_open,

.read = irq_drv_read,

.write = irq_drv_write,

.fasync = irq_drv_fasync,

.release = irq_drv_release,

};

static irqreturn_t irq_interrupt(int irq, void *dev_id)

{

printk("irq = %d\n", irq);

if(irq_is_open)

{

kill_fasync (&irq_async, SIGIO, POLL_IN);

}

return IRQ_HANDLED;

}

static int irq_probe(struct platform_device *pdev)

{

int err;

struct device *tmp_dev;

memset(devname,0,16);

strcpy(devname, DEVICE_NAME);

major = register_chrdev(0, devname, &irq_fops);

cls = class_create(THIS_MODULE, devname);

mijor = 1;

tmp_dev = device_create(cls, &pdev->dev, MKDEV(major, mijor), NULL, devname);

if (IS_ERR(tmp_dev)) {

class_destroy(cls);

unregister_chrdev(major, devname);

return 0;

}

irq = platform_get_irq(pdev,0);

if (irq <= 0)

return -ENXIO;

dev = &pdev->dev;

err = request_threaded_irq(irq, NULL,

irq_interrupt,

IRQF_TRIGGER_RISING | IRQF_ONESHOT,

devname, NULL);

if (err) {

printk(KERN_ALERT "irq_probe irq error=%d\n", err);

goto fail;

}

else

{

printk("irq = %d\n", irq);

printk("devname = %s\n", devname);

}

//保存dev

//platform_set_drvdata(pdev, &xxx);

return 0;

fail:

free_irq(irq, NULL);

device_destroy(cls, MKDEV(major, mijor));

class_destroy(cls);

unregister_chrdev(major, devname);

return -ENOMEM;

}

static int irq_remove(struct platform_device *pdev)

{

device_destroy(cls, MKDEV(major, mijor));

class_destroy(cls);

unregister_chrdev(major, devname);

free_irq(irq, NULL);

printk("irq = %d\n", irq);

return 0;

}

static int irq_suspend(struct device *dev)

{

return 0;

}

static int irq_resume(struct device *dev)

{

return 0;

}

static const struct dev_pm_ops irq_pm_ops = {

.suspend = irq_suspend,

.resume = irq_resume,

};

//MODULE_DEVICE_TABLE(platform, irq_driver_ids);

static const struct of_device_id irq_of_match[] = {

{.compatible = "hello,irq" },

{ }

};

MODULE_DEVICE_TABLE(of, irq_of_match);

static struct platform_driver irq_driver = {

.probe = irq_probe,

.remove = irq_remove,

.driver = {

.owner = THIS_MODULE,

.name = "irq@0",

.pm = &irq_pm_ops,

.of_match_table = irq_of_match,

},

};

module_platform_driver(irq_driver);

MODULE_LICENSE("GPL v2");

Makefile文件：

export ARCH=arm

KERN_DIR = /home/zynq/work/kernel/linux-4.9

all:

make -C $(KERN_DIR) M=`pwd` modules

clean:

make -C $(KERN_DIR) M=`pwd` modules clean

rm -rf modules.order

obj-m += irq_drv.o

編譯驅(qū)動(dòng)

開(kāi)發(fā)板掛接NFS文件系統(tǒng)，加載驅(qū)動(dòng)

然后按一下按鍵，內(nèi)核就能打印出IRQ

編寫(xiě)測(cè)試程序：

#include

#include

#include

#include

#include

#include

#include

#include

#include

int fd;

void my_signal_fun(int signum)

{

printf("irq app printf!\n");

}

int main(int argc, char **argv)

{

unsigned char key_val;

int ret;

int Oflags;

signal(SIGIO, my_signal_fun);

fd = open("/dev/irq_drv", O_RDWR);

if (fd < 0)

{

printf("can't open!\n");

}

fcntl(fd, F_SETOWN, getpid());

Oflags = fcntl(fd, F_GETFL);

fcntl(fd, F_SETFL, Oflags | FASYNC);

while (1)

{

sleep(1000);

}

return 0;

}

編譯

arm-linux-gnueabihf-gcc -o irq irq.c

回到開(kāi)發(fā)板運(yùn)行測(cè)試程序

按下按鍵之后能夠看到內(nèi)核和測(cè)試程序的打印信息

---------------------

作者：h244259402

來(lái)源：CSDN

原文：https://blog.csdn.net/h244259402/article/details/83993524

版權(quán)聲明：本文為博主原創(chuàng)文章，轉(zhuǎn)載請(qǐng)附上博文鏈接！

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