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大家好，我在I2C上有一个非常奇怪的行为，需要一些建议：我有一个PIC32 MX，它作为我的板上的I2C主控器和一个I2C从机的PIC16F。除作为一个1-Wire主机的其他功能之外，从微处理器芯片应用笔记AN1199实现。当主控器（PIC32）与从机（PIC16）通信时，只调用除1线功能之一以外的任何功能，一切工作正常。主可以尽可能多地写和读数据。但是，当我从主叫线上的1个线函数中的一个调用，这导致在1线线路上的通信时，I2C总线崩溃。这是非常奇怪的，因为1-Wire功能根本不与I2C总线交互。它只驱动一个I/O引脚高和低。有趣的是：公共汽车不是从奴隶一侧坠毁，而是在主人身边坠毁。在发送1线命令后，主机通过发送一个启动条件来读取从结果上的结果，然后用读取位发送地址，读取一个字节并最终设置停止位。当设置停止位时，总线总是崩溃：主机报告I2C总线上的总线冲突。有人知道这里有什么错误吗？
以上来自于百度翻译 以下为原文 Hi everyone, I have a really strange behavior on I2C and need some advice: I have a PIC32MX which works as a I2C master on my board and a PIC16F which is the I2C slave. The slave works in addition to other functionalities as a 1-Wire master which was implemented according to the Microchips application note AN1199. When the master (PIC32) communicates with the slave (PIC16) and just calls any function except one of the 1-Wire functions, everything works well. The master can write and read data as much as he wants. But as soon as I call one of the 1-Wire functions on the slave which causes a communication on the 1-Wire line, the I2C bus crashes. This is really strange, since the 1-Wire functions do not interact with the I2C bus at all. It is only driving an I/O pin high and low. The funny thing is: The bus does not crash on the slave side but on the master side. After the 1-Wire command was sent, the master trys to read the result on the slave by sending a start condition, then send the address with read bit, read one byte and finaly set the stop bit. The bus always crashes when setting the stop bit: The master reports a bus collision on the I2C bus. Does anyone have an idea what could be wrong here? 
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4个回答
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1-线代码禁用中断长时间吗？
以上来自于百度翻译 以下为原文 Is the 1-wire code disabling interrupts for extended periods? |
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不，它不是。我可以写1-Wire命令，使1-线主机通信（切换I/O）尽可能多，而不崩溃I2C总线。但是，当我读了一个字节（在1线通信之后），I2C总线崩溃了。如果中断将被禁用，这将导致问题，就不可能发送一个以上的“写入”命令。
以上来自于百度翻译 以下为原文 No it's not. I can write 1-Wire commands which cause the 1-Wire master to communicate (toggling I/O) as much as I want without crashing the I2C bus. But as soon as I read a byte (after 1-Wire communication) the I2C bus crashes. If the interrupts would be disabled and this would cause the issue, it would not be possible to send more than one "write" command. |
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在发送停止之前，您的I2C代码在读取最后一个字节之后是否正确地发送NACK（不是ACK）？
以上来自于百度翻译 以下为原文 Is your I2C code correctly sending a NAK (not an ACK) after reading the last byte, before you send the STOP? |
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伟大的！这是个骗局！我做了阅读，这就造成了错误，谢谢你的帮助！
以上来自于百度翻译 以下为原文 Great! This was the trick! I did ACK the read and this caused the error. Thanks for your help qhb! |
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