static ssize_t uart_write(struct file *filp,char *buf,size_t count,loff_t *f_pos)
{
int i;
char tx_buf[BUFFSIZE];
unsigned char lsr;
// size_t tx_buf_count=0;
struct inode *inode =filp->private_data;
printk("<1>uart_write MINOR = %d,filp->f_count is %d
",MINOR(inode->i_rdev),filp->f_count);
copy_from_user(tx_buf,buf,count);
for(i=0;i<count;i++)
{
while(!(lsr=readb(vEXT_COM_BASE_ADDR[MINOR(inode->i_rdev)]+LSR)&(0x1<<5)));
writeb(tx_buf,vEXT_COM_BASE_ADDR[MINOR(inode->i_rdev)]+THR);
}
return count;
}
static struct file_operations uart_fops=
{
owner: THIS_MODULE,
read: uart_read,
write: uart_write, //125行
open: uart_open,
release: uart_release,
flush: uart_flush,
ioctl: uart_ioctl,
};
编译时 125行有警告：warning: initialization from incompatible pointer type
想了很久 也不知道问题出在哪里 read 和write的函数差不多 为什么read不出问题而write就有呢
各位大虾帮帮忙 谢谢
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