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	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > 控制IO端口 s3c2410_gpio_setpin()的使用
            
    
            

            

            


	
	
	

            
	
            
		
            
			
            控制IO端口 s3c2410_gpio_setpin()的使用
            
						
            
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
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			本文基于FL2440 ARM開發(fā)板
            Linux內(nèi)核版本 2.6.28.7
            本文引用地址：http://www.biyoush.com/article/201611/318858.htm
            arm-linux-gcc 3.4.1
            1. #include
            2. #include
            3. #include
            4. #include
            5. #include
            6. #includeinterrupt.h>/*設(shè)置中斷方式*/
            7. #include
            8. #include
            9. #include
            10. #include
            11. #include
            12. //設(shè)備名
            13. #defineIO_DEVICE_NAME"my_io"
            14. //主設(shè)備號
            15. #defineIO_DEVICE_MAJOR240
            16. //次設(shè)備號
            17. #defineIO_DEVICE_SECONDARY32
            18. //返回一個數(shù)x的第y位
            19. #defineMYBIT(x,y)((x>>y)%2)
            20. #ifndef_LINUX_IRQRETURN_H
            21. #define_LINUX_IRQRETURN_H
            22. typedefintirqreturn_t;
            23. #defineIRQ_EINT00
            24. #defineIRQ_EINT22
            25. #defineIRQ_EINT33
            26. #defineIRQ_EINT432
            27. #defineIRQ_NONE(0)
            28. #defineIRQ_HANDLED(1)
            29. #defineIRQ_RETVAL(x)((x)!=0)
            30. #endif
            31. /*
            32. *S3C2410GPIOedgedetectionforIRQs:
            33. *IRQsaregeneratedonFalling-Edge,Rising-Edge,both,lowlevelorhigglevel.
            34. *Thismustbecalled*before*thecorrespondingIRQisregistered.
            35. */
            36. #defineEXT_LOWLEVEL0
            37. #defineEXT_HIGHLEVEL1
            38. #defineEXT_FALLING_EDGE2
            39. #defineEXT_RISING_EDGE4
            40. #defineEXT_BOTH_EDGES6
            41. staticintflag_0,flag_2;//中斷轉(zhuǎn)換標(biāo)志
            42. staticintcnt;
            43. DECLARE_WAIT_QUEUE_HEAD(io_wait);//聲明等待隊(duì)列
            44. voidio_con_set();
            45. staticirqreturn_tio_interrupt_0(intirq,void*dev_id,structpt_regs*regs)
            46. {
            47. printk("**********theinterrupt0works**********/n");
            48. if(flag_0==0)
            49. {
            50. cnt=(cnt+1)%2;
            51. flag_0=1;
            52. if(cnt==0)
            53. {
            54. printk("IN/n");
            55. s3c2410_gpio_setpin(S3C2410_GPB5,0);
            56. s3c2410_gpio_setpin(S3C2410_GPB6,1);
            57. }
            58. wake_up_interruptible(&io_wait);
            59. }
            60. returnIRQ_HANDLED;
            61. }
            62. staticirqreturn_tio_interrupt_2(intirq,void*dev_id,structpt_regs*regs)
            63. {
            64. printk("**********theinterrupt2works**********/n");
            65. if(flag_2==0)
            66. {
            67. cnt=(cnt+1)%2;
            68. flag_2=1;
            69. if(cnt==0)
            70. {
            71. printk("OUT/n");
            72. s3c2410_gpio_setpin(S3C2410_GPB5,1);
            73. s3c2410_gpio_setpin(S3C2410_GPB6,0);
            74. }
            75. wake_up_interruptible(&io_wait);
            76. }
            77. returnIRQ_HANDLED;
            78. }
            79. staticintio_open(structinode*inode,structfile*file)//打開設(shè)備函數(shù)
            80. {
            81. intret;
            82. set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//設(shè)置中斷0觸發(fā)方式
            83. set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//設(shè)置中斷2觸發(fā)方式
            84. //EXT_LOWLEVEL
            85. //EXT_HIGHLEVEL
            86. //EXT_FALLING_EDGE
            87. //EXT_RISING_EDGE
            88. //EXT_BOTH_EDGES
            89. disable_irq(IRQ_EINT0);
            90. disable_irq(IRQ_EINT2);
            91. enable_irq(IRQ_EINT0);
            92. enable_irq(IRQ_EINT2);
            93. ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷0
            94. if(ret<0)
            95. {
            96. printk("IRQ%dcannotrequest/n",IRQ_EINT0);
            97. returnret;
            98. }
            99. ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷2
            100. if(ret<0)
            101. {
            102. printk("IRQ%dcannotrequest/n",IRQ_EINT2);
            103. returnret;
            104. }
            105. printk("thedeviceisopened/n");
            106. io_con_set();
            107. cnt=0;
            108. return0;
            109. }
            110. voidio_con_set()//IO端口控制寄存器初始化
            111. {
            112. s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
            113. s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
            114. s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
            115. s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
            116. }
            117. staticintio_close(structinode*inode,structfile*file)//設(shè)備關(guān)閉函數(shù)
            118. {
            119. free_irq(IRQ_EINT0,1);//釋放中斷
            120. free_irq(IRQ_EINT2,1);//釋放中斷
            121. printk("thedeviceisclosed/n");
            122. return0;
            123. }
            124. staticssize_tio_read(structfile*filp,char*buff,size_tcount,loff_t*f_ops)//讀取IO端口
            125. {
            126. wait_event_interruptible(io_wait,flag_0);
            127. wait_event_interruptible(io_wait,flag_0);
            128. flag_0=0;
            129. flag_2=0;
            130. //printk("thevalueis%d/n",io_data);
            131. copy_to_user(buff,(char*)&cnt,sizeof(cnt));
            132. }
            133. staticstructfile_operationsio_device_fops=
            134. {
            135. .owner=THIS_MODULE,
            136. .read=io_read,
            137. .open=io_open,
            138. .release=io_close,
            139. };
            140. staticint__initio_init(void)//insmod加載驅(qū)動時執(zhí)行
            141. {
            142. intret;
            143. ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
            144. if(ret<0)
            145. {
            146. printk("Failtoregistthedevice/n");
            147. returnret;
            148. }
            149. return0;
            150. }
            151. staticint__exitio_exit(void)//rmmod卸載驅(qū)動時執(zhí)行
            152. {
            153. unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
            154. printk("thedevicehasbeenunregisted/n");
            155. }
            156. module_init(io_init);
            157. module_exit(io_exit);
            158. MODULE_LICENSE("GPL");
            Makefile同上一篇的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
            這次本人修改了下內(nèi)核頭文件的目錄，將目錄./arch/arm/include下asm文件夾復(fù)制到./include
            將目錄./arch/arm/mach-s3c2410/include下mach文件夾復(fù)制到./include下
            驅(qū)動修改版
            1. #include
            2. #include
            3. #include
            4. #include
            5. #include
            6. #include/*設(shè)置中斷方式*/
            7. #include
            8. #include
            9. #include
            10. #include
            11. #include
            12. //設(shè)備名
            13. #defineIO_DEVICE_NAME"my_io"
            14. //主設(shè)備號
            15. #defineIO_DEVICE_MAJOR240
            16. //次設(shè)備號
            17. #defineIO_DEVICE_SECONDARY32
            18. //返回一個數(shù)x的第y位
            19. #defineMYBIT(x,y)((x>>y)%2)
            20. #ifndef_LINUX_IRQRETURN_H
            21. #define_LINUX_IRQRETURN_H
            22. typedefintirqreturn_t;
            23. #defineIRQ_EINT00
            24. #defineIRQ_EINT22
            25. #defineIRQ_EINT33
            26. #defineIRQ_EINT432
            27. #defineIRQ_NONE(0)
            28. #defineIRQ_HANDLED(1)
            29. #defineIRQ_RETVAL(x)((x)!=0)
            30. #endif
            31. /*
            32. *S3C2410GPIOedgedetectionforIRQs:
            33. *IRQsaregeneratedonFalling-Edge,Rising-Edge,both,lowlevelorhigglevel.
            34. *Thismustbecalled*before*thecorrespondingIRQisregistered.
            35. */
            36. #defineEXT_LOWLEVEL0
            37. #defineEXT_HIGHLEVEL1
            38. #defineEXT_FALLING_EDGE2
            39. #defineEXT_RISING_EDGE4
            40. #defineEXT_BOTH_EDGES6
            41. staticintflag_0,flag_2;//中斷轉(zhuǎn)換標(biāo)志
            42. staticintcnt;
            43. DECLARE_WAIT_QUEUE_HEAD(io_wait);//聲明等待隊(duì)列
            44. voidio_con_set();
            45. staticirqreturn_tio_interrupt_0(intirq,void*dev_id,structpt_regs*regs)
            46. {
            47. if(flag_0==0)
            48. {
            49. printk("**********theinterrupt0works**********/n");
            50. cnt=(cnt+1)%2;
            51. flag_0=1;
            52. if(cnt==0)
            53. {
            54. printk("IN/n");
            55. s3c2410_gpio_setpin(S3C2410_GPB5,0);
            56. s3c2410_gpio_setpin(S3C2410_GPB6,1);
            57. }
            58. wake_up_interruptible(&io_wait);
            59. }
            60. returnIRQ_HANDLED;
            61. }
            62. staticirqreturn_tio_interrupt_2(intirq,void*dev_id,structpt_regs*regs)
            63. {
            64. if(flag_2==0)
            65. {
            66. printk("**********theinterrupt2works**********/n");
            67. cnt=(cnt+1)%2;
            68. flag_2=1;
            69. if(cnt==0)
            70. {
            71. printk("OUT/n");
            72. s3c2410_gpio_setpin(S3C2410_GPB5,1);
            73. s3c2410_gpio_setpin(S3C2410_GPB6,0);
            74. }
            75. wake_up_interruptible(&io_wait);
            76. }
            77. returnIRQ_HANDLED;
            78. }
            79. staticintio_open(structinode*inode,structfile*file)//打開設(shè)備函數(shù)
            80. {
            81. intret;
            82. set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//設(shè)置中斷0觸發(fā)方式
            83. set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//設(shè)置中斷2觸發(fā)方式
            84. //EXT_LOWLEVEL
            85. //EXT_HIGHLEVEL
            86. //EXT_FALLING_EDGE
            87. //EXT_RISING_EDGE
            88. //EXT_BOTH_EDGES
            89. disable_irq(IRQ_EINT0);
            90. disable_irq(IRQ_EINT2);
            91. enable_irq(IRQ_EINT0);
            92. enable_irq(IRQ_EINT2);
            93. ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷0
            94. if(ret<0)
            95. {
            96. printk("IRQ%dcannotrequest/n",IRQ_EINT0);
            97. returnret;
            98. }
            99. ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注冊中斷2
            100. if(ret<0)
            101. {
            102. printk("IRQ%dcannotrequest/n",IRQ_EINT2);
            103. returnret;
            104. }
            105. printk("thedeviceisopened/n");
            106. io_con_set();
            107. cnt=0;
            108. return0;
            109. }
            110. voidio_con_set()//IO端口控制寄存器初始化
            111. {
            112. s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
            113. s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
            114. s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
            115. s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
            116. }
            117. staticintio_close(structinode*inode,structfile*file)//設(shè)備關(guān)閉函數(shù)
            118. {
            119. free_irq(IRQ_EINT0,1);//釋放中斷
            120. free_irq(IRQ_EINT2,1);//釋放中斷
            121. printk("thedeviceisclosed/n");
            122. return0;
            123. }
            124. staticssize_tio_read(structfile*filp,char*buff,size_tcount,loff_t*f_ops)//讀取IO端口
            125. {
            126. wait_event_interruptible(io_wait,flag_0&flag_2);
            127. flag_0=0;
            128. flag_2=0;
            129. //printk("thevalueis%d/n",io_data);
            130. copy_to_user(buff,(char*)&cnt,sizeof(cnt));
            131. }
            132. staticstructfile_operationsio_device_fops=
            133. {
            134. .owner=THIS_MODULE,
            135. .read=io_read,
            136. .open=io_open,
            137. .release=io_close,
            138. };
            139. staticint__initio_init(void)//insmod加載驅(qū)動時執(zhí)行
            140. {
            141. intret;
            142. ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
            143. if(ret<0)
            144. {
            145. printk("Failtoregistthedevice/n");
            146. returnret;
            147. }
            148. return0;
            149. }
            150. staticint__exitio_exit(void)//rmmod卸載驅(qū)動時執(zhí)行
            151. {
            152. unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
            153. printk("thedevicehasbeenunregisted/n");
            154. }
            155. module_init(io_init);
            156. module_exit(io_exit);
            157. MODULE_LICENSE("GPL");
            這個驅(qū)動實(shí)際上是通過紅外傳感器檢測電平變化，來實(shí)現(xiàn)人數(shù)的統(tǒng)計，改進(jìn)后能夠?qū)崿F(xiàn)正確的通過中斷先后來識別方向，還排除了單一中斷的
            抖動干擾。
            
				
            
                
			
							
            
                
			              
              
            
            
		
            
		
            
		
            
		
            
		
            
			
              
				
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