Linux下驱动2.4G无线模块(NRF24L01)(5)

//文件的写函数
static ssize_t nrf24l01_write(struct file *filp, const char *buffer,
             size_t count, loff_t *ppos)
{
    if( copy_from_user( &TxBuf, buffer, count ) );    //从内核空间复制到用户空间
    {
 printk("Can't Send Data !");
 return -EFAULT;
    }

nRF24L01_TxPacket(TxBuf);
    SPI_RW_Reg(WRITE_REG+STATUS,0XFF);
    printk("OK! \n");
    return(10);
}

//的读函数
static ssize_t nrf24l01_read(struct file *filp, char *buffer,
              size_t count, loff_t *ppos)
{
    nRF24L01_TxPacket(TxBuf);
    SPI_RW_Reg(WRITE_REG+STATUS,0XFF);
    printk("read \n");

return (10);
}

static int nrf24l01_open(struct inode *node, struct file *file)
{
  uint8 flag = 0;

if(opencount == 1)
    return -EBUSY;
 
  flag = init_NRF24L01();

mdelay(100);
  if(flag == 0)
    {
      printk("uable to open device!\n");
      return -1;
    }
  else
   {
      opencount++;
      printk("device opened !\n");
      return 0;
   }
}

static int nrf24l01_release(struct inode *node, struct file *file)
{
  opencount--;
  printk(DEVICE_NAME " released !\n");
  return 0;
}

static struct file_operations nrf24l01_fops = {
  .owner = THIS_MODULE,
  .open = nrf24l01_open,
  .write = nrf24l01_write,
  .read = nrf24l01_read,
  .release = nrf24l01_release,
};

static int __init nrf24l01_init(void)
{
    int ret;

printk("Initial driver for NRF24L01......................\n");
    ret = register_chrdev(NRF24L01_MAJOR, DEVICE_NAME, &nrf24l01_fops);
    mdelay(10);
    if (ret < 0)
    {
        printk(DEVICE_NAME " can't register major number\n");
        return ret;

}
    else
    {
        printk(DEVICE_NAME " register success\n");
 return 0;
    }
}

static void __exit nrf24l01_exit(void)
{
    unregister_chrdev(NRF24L01_MAJOR, DEVICE_NAME);
    printk("NRF24L01 unregister success \n");
}

module_init(nrf24l01_init);
module_exit(nrf24l01_exit);
MODULE_AUTHOR("jammy_lee@163.com");
MODULE_DESCRIPTION("nrf24l01 driver for TQ2440");
MODULE_LICENSE("GPL");

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

测试程序：

/************************************************************/
//文件名：test_ds18b20.c
//功能:测试linux下的ds18b20程序
//使用说明: (1)
//          (2)
//          (3)
//          (4)
//作者:jammy-lee
//日期:2010-01-18
/************************************************************/

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/select.h>

#include <sys/time.h>

#include <errno.h>

unsigned char TxBuf[32] = {0x00};

int main(void)

{

int fd = -1;

int count = 1;
 

//fd = open("/dev/nrf24l01", 0);

fd = open("/dev/nrf24l01", O_RDWR);   //打开nrf24l01为可读写文件

if(fd < 0)

{

perror("Can't open /dev/nrf24l01 \n");

exit(1);

}

printf("open /dev/nrf24l01 success \n");

while(count <= 5)
    {

write(fd, &TxBuf , sizeof(TxBuf));

printf("Sending %d time \n", count);

usleep(100*1000);
           
        count++;
    }

close(fd);
}