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	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > 通過IO端口讀取外部數(shù)據(jù)，帶中斷
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          通過IO端口讀取外部數(shù)據(jù)，帶中斷
          
						
          
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
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			基于FL2440開發(fā)板，內(nèi)核版本2.6.28
          主機平臺：Ubuntu 11.04 內(nèi)核版本2.6.39
          本文引用地址：http://cafeforensic.com/article/201611/318855.htm
          驅(qū)動代碼

          1. #include
          2. #include
          3. #include
          4. #include
          5. #include
          6. #includeinterrupt.h>/*設(shè)置中斷方式*/
          7. #include
          8. #include
          10. #include
          12. #include
          13. #include
          15. //設(shè)備名
          16. #defineIO_DEVICE_NAME"my_io"
          17. //主設(shè)備號
          18. #defineIO_DEVICE_MAJOR240
          19. //次設(shè)備號
          20. #defineIO_DEVICE_SECONDARY32
          22. //返回一個數(shù)x的第y位
          23. #defineMYBIT(x,y)((x>>y)%2)
          25. #ifndef_LINUX_IRQRETURN_H
          26. #define_LINUX_IRQRETURN_H
          28. typedefintirqreturn_t;
          30. #defineIRQ_NONE(0)
          31. #defineIRQ_HANDLED(1)
          32. #defineIRQ_RETVAL(x)((x)!=0)
          33. #endif
          35. /*
          36. *S3C2410GPIOedgedetectionforIRQs:
          37. *IRQsaregeneratedonFalling-Edge,Rising-Edge,both,lowlevelorhigglevel.
          38. *Thismustbecalled*before*thecorrespondingIRQisregistered.
          39. */
          40. #defineEXT_LOWLEVEL0
          41. #defineEXT_HIGHLEVEL1
          42. #defineEXT_FALLING_EDGE2
          43. #defineEXT_RISING_EDGE4
          44. #defineEXT_BOTH_EDGES6
          47. staticintflag_0,flag_2;//中斷轉(zhuǎn)換標志
          48. staticintcnt;
          49. intdata;
          50. DECLARE_WAIT_QUEUE_HEAD(io_wait);//聲明等待隊列
          53. voidio_con_set();
          55. staticirqreturn_tio_interrupt_0(intirq,void*dev_id,structpt_regs*regs)
          56. {
          57. if(flag_0==0)
          58. {
          59. printk("**********theinterrupt0works**********n");
          60. cnt=(cnt+1)%2;
          61. flag_0=1;
          62. if(cnt==0)
          63. {
          64. printk("INn");
          65. data=1;
          66. s3c2410_gpio_setpin(S3C2410_GPB5,0);
          67. s3c2410_gpio_setpin(S3C2410_GPB6,1);
          68. }
          69. wake_up_interruptible(&io_wait);
          70. }
          71. returnIRQ_HANDLED;
          72. }
          73. staticirqreturn_tio_interrupt_2(intirq,void*dev_id,structpt_regs*regs)
          74. {
          75. if(flag_2==0)
          76. {
          77. printk("**********theinterrupt2works**********n");
          78. cnt=(cnt+1)%2;
          79. flag_2=1;
          80. if(cnt==0)
          81. {
          82. printk("OUTn");
          83. data=0;
          84. s3c2410_gpio_setpin(S3C2410_GPB5,1);
          85. s3c2410_gpio_setpin(S3C2410_GPB6,0);
          86. }
          87. wake_up_interruptible(&io_wait);
          88. }
          89. returnIRQ_HANDLED;
          90. }
          91. staticintio_open(structinode*inode,structfile*file)//打開設(shè)備函數(shù)
          92. {
          93. intret;
          94. set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//設(shè)置中斷0觸發(fā)方式
          95. set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//設(shè)置中斷2觸發(fā)方式
          96. //EXT_LOWLEVEL
          97. //EXT_HIGHLEVEL
          98. //EXT_FALLING_EDGE
          99. //EXT_RISING_EDGE
          100. //EXT_BOTH_EDGES
          101. disable_irq(IRQ_EINT0);
          102. disable_irq(IRQ_EINT2);
          103. enable_irq(IRQ_EINT0);
          104. enable_irq(IRQ_EINT2);
          105. ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷0
          106. if(ret<0)
          107. {
          108. printk("IRQ%dcannotrequestn",IRQ_EINT0);
          109. returnret;
          110. }
          111. ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷2
          112. if(ret<0)
          113. {
          114. printk("IRQ%dcannotrequestn",IRQ_EINT2);
          115. returnret;
          116. }
          117. printk("thedeviceisopenedn");
          118. io_con_set();
          119. cnt=0;
          120. return0;
          121. }
          122. voidio_con_set()//IO端口控制寄存器初始化
          123. {
          124. s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
          125. s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
          126. s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
          127. s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
          128. }
          129. staticintio_close(structinode*inode,structfile*file)//設(shè)備關(guān)閉函數(shù)
          130. {
          131. free_irq(IRQ_EINT0,1);//釋放中斷
          132. free_irq(IRQ_EINT2,1);//釋放中斷
          133. printk("thedeviceisclosedn");
          134. return0;
          135. }
          136. staticssize_tio_read(structfile*filp,char*buff,size_tcount,loff_t*f_ops)//讀取IO端口
          137. {
          138. wait_event_interruptible(io_wait,flag_0&flag_2);
          139. flag_0=0;
          140. flag_2=0;
          141. copy_to_user(buff,(char*)&data,sizeof(data));
          142. }
          143. staticstructfile_operationsio_device_fops=
          144. {
          145. .owner=THIS_MODULE,
          146. .read=io_read,
          147. .open=io_open,
          148. .release=io_close,
          149. };
          151. staticint__initio_init(void)//insmod加載驅(qū)動時執(zhí)行
          152. {
          153. intret;
          154. ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
          155. if(ret<0)
          156. {
          157. printk("Failtoregistthedevicen");
          158. returnret;
          159. }
          160. return0;
          161. }
          162. staticint__exitio_exit(void)//rmmod卸載驅(qū)動時執(zhí)行
          163. {
          164. unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
          165. printk("thedevicehasbeenunregistedn");
          166. }
          168. module_init(io_init);
          169. module_exit(io_exit);
          171. MODULE_LICENSE("GPL");
          Makefile
          obj-m := my_io.o
          KERNELDIR ?= /arm/linux-2.6.28.7-2440
          PWD := $(shell pwd)
          default:
          $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
          clean:
          rm -f *.o *.ko *.order *.symvers
          調(diào)用代碼：
          1. #include
          2. #include
          3. #include
          5. #defineMY_DEVICE"/dev/my_io"
          7. intmain()
          8. {
          9. intret;
          10. intdata;
          11. inti;
          12. ret=open(MY_DEVICE,0);
          13. printf("ret=%dn",ret);
          14. for(i=0;i<20;i++)
          15. {
          16. read(ret,&data,sizeof(data));
          17. printf("thedatais%dn",data);
          18. }
          19. close(ret);
          20. printf("thedeviceisclosedn");
          21. return0;
          22. }

          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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