[问答]

使用pic 16f690中断需要帮助

问答对人有帮助，内容完整，我也想知道答案 0 嗨，我有一个非常简单的代码来测试使用我的PIC外部中断。该代码只具有一个LED，并且在发生外部中断的情况下将被关闭（在这种情况下，推动连接到RA2的开关，这是PIC16F690上的INT引脚）。但是，当我按下开关时，什么也没有发生。可能是什么问题？下面的代码以上来自于百度翻译以下为原文 Hi, I got a very simple code to test the use of external interrupts with my pic. The code simply has an led that is on, and will be turned off in case an external interrupt occurs (in this case, pushing a switch connected to RA2 which is the INT pin on the PIC16f690.) When I push the switch though, nothing happens. What could be the problem? Code below list p=16f690 #include "p16f690.inc" ; CONFIG ; __config 0xFCF1 __CONFIG _FOSC_XT & _WDTE_OFF & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOREN_OFF & _IESO_ON & _FCMEN_ON ORG 0x00 ; processor reset vector GOTO START ; go to beginning of program ORG 0x04 ; interrupt vector GOTO ISR ; go to interrupt service routine START BANKSEL TRISA BSF TRISA, 2 ;set RA2(INT PIN) as input BCF TRISA, 0 ;SET RA0 AS AN OUTPUT (led) BANKSEL INTCON ;go to INTCON REGISTER MOVLW b'10010000' MOVWF INTCON ;Global interrupt enabled, External interrupt enabled GOTO MAIN ;Interrupt service routine-------------------------------------------------------- ISR BCF INTCON, GIE ;Disable all interrupts inside interrupt service routine BCF PORTA,0 ;clear RA0 BCF INTCON,INTF ;Clear external interrupt flag bit BSF INTCON, GIE ;Enable all interrupts on exit GOTO MAIN ;Main routine--------------------------------------------------------------------- MAIN BSF PORTA,0 ;Set RA.0 GOTO MAIN ;Loop END 0
2018-9-26 16:32:50　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答技术发广告该类别下有 56 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报王玉华相关推荐 • 在连接LCD和PIC 16f690时需要帮助 665 • 16F690时钟速度怎么设置？ 1333 • 16F690串行通讯错误的字符 1176 • 无法在资源管理器8中编程PIC16F690 1545 • 如何6F1829的过度消费？ 1041 • 16F690和HD44780有问题如何解决 989 • DS1307 PIC16f690 2796 • 请问如何生成频率使用Time1中断PIC16F1786？ 908 • 如何扫描和写一个pic16F690程序？ 1379 • PIC16F690 SPI问题 1174 2个回答

答案对人有帮助，有参考价值 0 你的中断服务程序有几个错误，但是主要的错误是，即使发生中断，一旦你关闭了LED，你就跳回main，使它再次打开这么快，你不可能看到它！以上来自于百度翻译以下为原文 There are several things wrong with your interrupt service routine, but the main bug is that even if an interrupt does occur, as soon as you turn the LED off, you jump back to MAIN which turns it back on again so quickly you could not possibly see it!

2018-9-26 16:40:41 评论举报吴键洪

答案对人有帮助，有参考价值 0 现在，什么是“几件事错了”？（1）不要触摸中断服务中的GIE标志。这是错误的、错误的、错误的，并且会导致真正中断的主要问题。当ISR开始运行时，GIE已经被禁用。ISR应该以ReFie指令退出，该指令以安全的方式设置GIE。在执行返回之前设置GIE将导致错误。（2）ISR必须在它可以做任何事情之前保存状态和W寄存器。在PIC16F690数据表中读取“中断期间的14.4上下文保存”。当ISR开始运行时，它也不能假设银行0被选中。位置4的结构。把实际的ISR放在那里。你可以在小程序中逃脱它，但是一旦你开始使用所有的程序内存，位置4的GOTO会导致崩溃。现在就开始做，以后你就不会有神秘的问题了。以上来自于百度翻译以下为原文 Now, what are the "several things wrong" ? [1] Do NOT touch the GIE flag inside your interrupt service. That is WRONG, WRONG, WRONG, and will cause major issues with real interrupts. GIE is already disabled when the ISR starts running. An ISR should exit with a RETFIE instruction, which sets GIE in a safe manner. Setting GIE before the return is executed will cause bugs. [2] Your ISR must save the STATUS and W register before it can do anything. Read "14.4 Context Saving During Interrupts" in your PIC16F690 datasheet. It also cannot assume bank 0 is selected when the ISR starts running. [3] Do NOT put a GOTO instruction at location 4. Put the actual ISR there. You can get away with it in small programs, but once you start using all the program memory, a GOTO at location 4 WILL cause crashes. Start doing it right now, and you won't have mysterious problems later.

2018-9-26 16:54:46 评论举报吴键洪