I2C铁电存储器驱动程序,测试程序出问题

发布于 2022-10-15 06:34:03 字数 25818 浏览 23 评论 0

这是一个I2C铁电存储器驱动程序，驱动已经编译、并加载到arm开发板s3c2440上,
测试程序运行结果不成功，这是怎么回事，是测试程序错了吗，如果要调试驱动程序的话如何调试呢？
请各位帮帮忙啦

FM24CL16驱动程序：

#include <asm/io.h>
#include "config.h"
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include "hardware.h"
#include <linux/gpio.h>
#include <mach/regs-gpio.h>

#define u32 unsigned int
#define u16 unsigned short
#define s32 int
#define s16 short int
#define u8 unsigned char

/* I/O PORT */

//#define PCONF (*(volatile unsigned *)0x56000040)
//#define PDATF (*(volatile unsigned *)0x56000044)
//#define PUPF (*(volatile unsigned *)0x5600004

/*
#define IICCON (*(volatile unsigned *)0x54000000)
#define IICSTAT (*(volatile unsigned *)0x54000004)
#define IICADD (*(volatile unsigned *)0x5400000

#define IICDS (*(volatile unsigned *)0x5400000c)
*/

#define iiccon  0x54000000
#define iicstat 0x54000004
#define iicds 0x5400000c
#define iicadd 0x54000008
#define iicl  0x54000010
#define clkcon 0x4c00000c
static void *IICSTAT;
static void *IICCON;
static void *IICDS;
static void *IICADD;
static void *IICLC;

#ifdef CONFIG_DEVFS_FS
static devfs_handle_t devfs_iic_dir, devfs_iicraw;
#endif

#define SKQ_IIC_MODULE_NAME "IICBUS"
/*60--63,120--127,240--254*/
#define IICBUS_MAJOR 240
#define IICBUSRAW_MINOR 1

#define IICBUS_INT IRQ_IIC

static char *IICBUD_id = "SKQ IICBUS driver v1.0 (2005-06-02)<psc@hualiangtech.com>";

/* debug macros */
#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK( x... )       printk("SKQ IICBUS: "##x)
#else
#define DPRINTK( x... )
#endif

#define WRDATA (1)
#define POLLACK (2)
#define RDDATA (3)
#define SETRDADDR (4)

#define IICBUFSIZE 2048

char IICBUS_Buf[IICBUFSIZE];

static int opencount=0;
static int tsMajor=0;
static loff_t newpos=0;
int writeFM24CL16(char * buffer, size_t count, int address)
{
unsigned long timeo;
u16 i;
u16 PageAdd;
char slvAddr, tpICON,tempIICSTAT;
IICCON=(1<<7)|(0<<6)|(1<<5)|(0xf);
IICSTAT=0x10;

slvAddr=0xa0;
PageAdd=address;
/*  send the bit of start and address of device and page of address */
PageAdd>>=7;
PageAdd&=0x0e;
slvAddr=(char)PageAdd;
slvAddr|=0xa0;
IICDS=slvAddr;  //0xa0
IICSTAT=0xf0; //MasTx,Start

timeo = jiffies + (HZ/100);
while(1)
{
tpICON=IICCON;
tpICON&=0x10; /* pending */
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01; /* ack */
if((tpICON==0x10)) break; //&&(tempIICSTAT==0x00)
if(time_after(jiffies,timeo))
{
IICSTAT=0xd0;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf; /*clr pending */

IICDS=(char)address;  //0xa0
timeo = jiffies +(HZ/100);
while(1)
{
tpICON=IICCON;
tpICON&=0x10;
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01;
if((tpICON==0x10)) break;  // &&tempIICSTAT==0x00)
if(time_after(jiffies,timeo))
{
IICSTAT=0xd0;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf;

for(i=0;i<count;i++)
{
IICDS=buffer;
timeo=jiffies + (HZ/100);
while(1)
{
tpICON=IICCON;
tpICON&=0x10;
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01;
if((tpICON==0x10)&&(tempIICSTAT==0x00)) break;
if(time_after(jiffies,timeo))
{
IICSTAT=0xd0;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf;  /* clr pending */
}
IICSTAT =0xd0;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return count;
}

int ReadFM24CL16(char *buffer, size_t count, int address)
{
unsigned long timeo;
u16 i;
u8 slvAddr ,tpICON,tempIICSTAT;
u16 PageAdd;
PageAdd=address;
/* 发送起始位和设备地址和页地址 */
PageAdd>>=7;
PageAdd&=0x0e;
slvAddr=(char )PageAdd;
slvAddr|=0xa0;
IICDS=slvAddr;  //0xa0;
IICSTAT=0xf0; //MasTx,Start
timeo = jiffies +(HZ/100);
while(1){
tpICON=IICCON;
tpICON&=0x10;
// tempIICSTAT=rIICSTAT;
//tempIICSTAT&=0x01;
if((tpICON==0x10)) break;  //&&(tempIICSTAT==0x00)
if(time_after(jiffies,timeo))
{
IICSTAT=0x90;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf;
/* 发送地址低8位 */
IICDS=(char)address;
timeo = jiffies + (HZ/100);
while(1){
tpICON=IICCON;
tpICON&=0x10;
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01;
if((tpICON==0x10)) break;  //&&(tempIICSTAT==0x00)
if(time_after(jiffies, timeo))
{
IICSTAT=0x90;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf;
//IICSTAT&=0xef;
/* 发送起始位和设备地址和页地址 */
PageAdd>>=7;
PageAdd&=0x0e;
slvAddr=(char )PageAdd;
slvAddr|=0xa1;
IICDS=slvAddr;
IICSTAT=0xb0;  //MasRx,Start
timeo = jiffies +(HZ/100);
while(1){
tpICON=IICCON;
tpICON&=0x10;
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01;
if((tpICON==0x10)) break; // &&(tempIICSTAT==0x00)
if(time_after(jiffies,timeo))
{
IICSTAT=0x90;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
IICCON=0xaf;

for(i=0;i<count;i++)
{
IICDS=slvAddr;
//timeo =jiffies +(HZ/100);
while(1){
tpICON=IICCON;
tpICON&=0x10;
tempIICSTAT=IICSTAT;
tempIICSTAT&=0x01;
if((tpICON==0x10)) break ;//(tempIICSTAT==0x00)
//else
// {
// if((tpICON==0x10)&&(i==count-1))break;
// }
if(time_after(jiffies, timeo))
{
IICSTAT=0x90;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;
return -1;
}
};
buffer=IICDS;
if(i==count-1) IICCON=0x2f;
else IICCON=0xaf;
}

IICSTAT=0x90;
IICCON=0xaf;
udelay(200);
IICCON=0xaf;
IICSTAT=0x10;

return count;
}

loff_t  IICBUS_llseek(struct file *filp, loff_t off,int whence)
{
switch(whence){
case 0 : /* SEEK_SET */
newpos=off;
break;
default: /* cant,t happen */
return -EINVAL;
}
if(newpos<0) return -EINVAL;
return newpos;
}

static ssize_t IICBUS_write(struct file *file,const char *buffer,size_t count, loff_t *ppos)
{
int ret;
int address=(int)newpos;
if(count>204 return 0;
// copy_from_user(&address,ppos, sizeof(loff_t));
// address=(int)*ppos;
// printk("IICBUS_write address=%ld\n",address);
if(address+count>204 return 0;
copy_from_user(IICBUS_Buf, buffer, address);
ret=writeFM24CL16(IICBUS_Buf,count,address);
return ret;
}
static ssize_t IICBUS_read(struct file *filp,char *buffer,size_t count, loff_t *ppos)
{
int len;
int address=(int)newpos;
//int address1;
if(count>204 return 0;
//copy_from_user(&address,ppos, sizeof(loff_t));
//address=(int)*ppos;
//printk("IICBUS_read address=%d\n",address);
if(address+count>204 return 0;
//address1=(int)*ppos;
//printk("IICBUS_read address1=%ld\n",address);
//printk("IICBUS_read ppos=%ld\n",ppos);
len=ReadFM24CL16(IICBUS_Buf,count,address);
copy_to_user(buffer,IICBUS_Buf,len);
DPRINTK("read data=%d\n",data);
return len;
}

static int IICBUS_open(struct inode *inode, struct file *file)
{
//if(opencount==1)
//return -EBUSY;
opencount++;
   try_module_get(THIS_MODULE); //MOD_INC_USE_COUNT;
DPRINTK("device open\n";
return 0;
}

static int IICBUS_release(struct inode *inode, struct file *filp)
{
opencount--;
module_put(THIS_MODULE); //MOD_DEC_USE_COUNT;
DPRINTK("device release\n";
return 0;
}
static struct file_operations s3c44b0_iicbus_fops ={
owner: THIS_MODULE,
llseek: IICBUS_llseek,
write: IICBUS_write,
read: IICBUS_read,
open: IICBUS_open,
release: IICBUS_release,
};

static int __init IICBUS_init(void)
{
s3c2410_gpio_cfgpin(S3C2410_GPB(14),S3C2410_GPE14_IICSCL);
s3c2410_gpio_cfgpin(S3C2410_GPB(15),S3C2410_GPE15_IICSDA);

IICCON=ioremap(iiccon,0x00000004);
IICSTAT=ioremap(iicstat,0x00000004);
IICDS=ioremap(iicds,0x00000004);
IICADD=ioremap(iicadd,0x00000004);
IICLC=ioremap(iicl,0X00000004);

int ret;
int flags;
//local_irq_save(flags);
/* port F */
/* Bit8 7 6 5 4 3 2
                  SPICKL SPIMISO SPICS SPIMOSI INCARD2 NC NC */
         //       PCONF |=0x0a; //PF0:IICSCL,PF1:IICSDA
            //    PUPF |=0x03; //pull-up disable
                  IICCON=(1<<7)|(0<<6)|(0<<5)|(0xf);
                  //Enable interrupt,IICCLK=MCKL/16,Enable ACK
                  //40Mhz/16/(15+1)=257khz
                  IICADD=0x10;  //s3c44B0X slave address
                  IICSTAT=0x10;
      //          local_irq_restore(flags);
                  opencount=0;
                  ret = register_chrdev(IICBUS_MAJOR, SKQ_IIC_MODULE_NAME,&s3c44b0_iicbus_fops);
                  if (ret<0)
      {
                  printk( "can't get major number\n";
               return -1;
                  }
                  tsMajor=ret;
                  #if 0
                  if(0 !=request_irq(IICBUS_INT,IICBUS_isr,SA_INTERRUPT,IICBUD_id,NULL))
                  {
                           printk(KERN_WARNING "tce44b0_usb:failed to get IRQ\n";
                           return 1;
                  }
                  #endif
#ifdef CONFIG_DEVFS_FS
      devfs_iic_dir = devfs_mk_dir(NULL,SKQ_IIC_MODULE_NAME,NULL);
   devfs_iicraw = devfs_register(devfs_iic_dir, "0",DEVFS_FL_DEFAULT,
                     tsMajor,IICBUSRAW_MINOR,S_IFCHR | S_IRUSR | S_IWUSR, &s3c44b0_iicbus_fops,NULL);
#endif
printk(SKQ_IIC_MODULE_NAME " initialized\n";
      return 0;
}

static void __exit IICBUS_exit(void)
{
printk("<0>SKQ IIC Exit.\n";
// free_irq(IICBUS_INT, IICBUD_id);
      unregister_chrdev_region(IICBUS_MAJOR,1);
}

module_init(IICBUS_init);
module_exit(IICBUS_exit);
MODULE_DESCRIPTION("SKQ IIC driver";
MODULE_AUTHOR("pengshicao ";
MODULE_LICENSE("GPL";





测试程序：
(dev/IICBUS 是一个手动创建的设备文件)

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#define  DEV_NAME "/dev/IICBUS"
int main()
{ int fd,ret,i;
  int wr_data[5]={0x00,0x10,0x30,0x70,0xf0};
  int ra_data[5];
  fd=open(DEV_NAME,O_RDWR);
  if (fd<0)
{ printf ("the derive is opened fail !!\n";
   return fd;
   }
else
{ printf ("the derive is opened success !!\n");
write(fd,wr_data,sizeof(wr_data));
   for(i=0;i<5;i++)
   { printf ("write-----data=%x\n",wr_data);
            }
   sleep(2);
read(fd,ra_data,20);
  for (i=0;i<5;i++)
{  printf ("read------data=%x\n",ra_data);
            }
      }
ret=close(fd);
printf ("the ret=%d\n",ret);
}

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