新聞中心
        
	
        
	
        
	
        EEPW首頁 
	 > 嵌入式系統 > 設計應用 > 通過IO端口讀取外部數據，帶中斷
        
    
        

        

        


	
	
	

        
	
        
		
        
			
        通過IO端口讀取外部數據，帶中斷
        
						
        
				作者：
				時間：2016-11-20
				來源：網絡

							
				
				
				
				收藏
			
        

			
        
				
				
			
        

			
        
			
			
        
			
			
        
				
				
			
        
                
			基于FL2440開發板，內核版本2.6.28
        主機平臺：Ubuntu 11.04 內核版本2.6.39
        本文引用地址：http://www.104case.com/article/201611/318855.htm
        驅動代碼

        1. #include
        2. #include
        3. #include
        4. #include
        5. #include
        6. #includeinterrupt.h>/*設置中斷方式*/
        7. #include
        8. #include
        10. #include
        12. #include
        13. #include
        15. //設備名
        16. #defineIO_DEVICE_NAME"my_io"
        17. //主設備號
        18. #defineIO_DEVICE_MAJOR240
        19. //次設備號
        20. #defineIO_DEVICE_SECONDARY32
        22. //返回一個數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)//打開設備函數
        92. {
        93. intret;
        94. set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//設置中斷0觸發方式
        95. set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//設置中斷2觸發方式
        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)//設備關閉函數
        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加載驅動時執行
        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卸載驅動時執行
        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. }

        
				
            
                
			
							
        
                
			              
              
            
        
		
        
		
        
		
        
		
        
		
        
			
          
				
        • 
					
					
			  	
          • 
			  	
        • 
					
					
			  	
          • 
			  	
        • 
					
					
			  	
          • 
				
        • 
					
					
				
          • 
				
        • 
					
					
				
          • 
			
        
			
        
		
        
		
		
        
		
        
			
			
		
        
        
			
		

	

        
	
	
        
		
        
			
        評論
        					
		
        
		
        
			
        
			
				
        
					
					
        
						
                        
					
        
				
        
                		
						
						
			
        
		
        
		
        
		
        
            
			
            
		
        
	
        
	
        
	
        
		
		

        


	
        
	
        
		
		
	
        


    
        
        
        技術專區
        
      
        
      
        
			
      
         
       

        

   











        
	
        
	    關閉
	
        
	
	

        














	
	



        




        





主站蜘蛛池模板：
达州市|
常州市|
佛坪县|
射阳县|
漳州市|
凉山|
麻阳|
南安市|
开阳县|
民丰县|
新乡县|
镇雄县|
天津市|
海盐县|
泗水县|
潜江市|
万安县|
武鸣县|
将乐县|
汤阴县|
丽水市|
运城市|
容城县|
武胜县|
大田县|
甘德县|
正安县|
德惠市|
平凉市|
常宁市|
徐水县|
稻城县|
尚义县|
泾阳县|
乌兰浩特市|
柳林县|
广德县|
长岛县|
阳朔县|
乐业县|
德昌县|