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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)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(shí)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.ex-cimer.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(hào)
          15. #defineIO_DEVICE_MAJOR240
          16. //次設(shè)備號(hào)
          17. #defineIO_DEVICE_SECONDARY32
          18. //返回一個(gè)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(dòng)時(shí)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(dòng)時(shí)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(dòng)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(hào)
          15. #defineIO_DEVICE_MAJOR240
          16. //次設(shè)備號(hào)
          17. #defineIO_DEVICE_SECONDARY32
          18. //返回一個(gè)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(dòng)時(shí)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(dòng)時(shí)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(gè)驅(qū)動(dòng)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(jì)，改進(jìn)后能夠?qū)崿F(xiàn)正確的通過中斷先后來識(shí)別方向，還排除了單一中斷的
          抖動(dòng)干擾。
          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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            			            控制IO端口s3c241
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
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