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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)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(shí)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(jī)平臺(tái)：Ubuntu 11.04 內(nèi)核版本2.6.39
            本文引用地址：http://www.biyoush.com/article/201611/318855.htm
            驅(qū)動(dòng)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(hào)
            18. #defineIO_DEVICE_MAJOR240
            19. //次設(shè)備號(hào)
            20. #defineIO_DEVICE_SECONDARY32
            22. //返回一個(gè)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(biāo)志
            48. staticintcnt;
            49. intdata;
            50. DECLARE_WAIT_QUEUE_HEAD(io_wait);//聲明等待隊(duì)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(dòng)時(shí)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(dòng)時(shí)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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