UART处于字节模式RX中断

“我通过在ISR中给出断点来检查这一点。我还观察到，在U5RXRG中，我希望得到的任何数据都是可用的。即使在调试器中观察到它，情况也可能如此。至于“一旦收到字节，它就进入UART5RX ISR并执行它，并且在某个时候再次出现在ISR中”。



      以下为原文

    "I checked this by giving breakpoint in ISR. I also observed that whatever data I am expecting to receive is available in U5RXREG."
 
If you read the register, you remove that data.  Even if you observe it in the debugger, that may be the case.
 
As to " As soon as byte is received, it comes in UART5RX ISR and execute it and again after sometime it again comes in ISR.", it sounds like the interrupt flag is not clearing.

是的，即使在完成ISR之后，中断标志似乎也未被清除。现在，我把UART变为轮询模式，它正在工作。我知道这不是一个实际的解决办法，但不管怎样，它是有效的。



      以下为原文

    Yes the interrupt flag seems uncleared even after completing execution of ISR. Now, I changed UART to polling mode, it is working. I know its not a actual solution, but anyway its working.

你是在ISR中清除它还是假设ISR机制为你服务？



      以下为原文

    Are you clearing it in the ISR or assuming the ISR mechanism does it for you?

是的，我假设ISR机制正在清除它。而且似乎ISR也在调用函数来清除中断标志。



      以下为原文

    Yes, I am assuming the ISR mechanism is clearing it. And it seems that ISR is also calling the function to clear that interrupt flag.

我会通过它，看看它是否真的执行。如果它根本没有清除中断，那么你就有更大的问题了。如果它在读取数据之前清除它，那么它可能会重新出现。如果它在它重新开始之后清除它，那么还有另一个条件（例如FIFO中的更多数据，或者像帧错误之类的其他条件）。



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    I would step through that and see that it really executes.  If it is not clearing the interrupt, at all, then you have a bigger problem.  If it clears it before you read data, then it might reassert.  If it clears it after but it reasserts, then there is another condition (e.g. more data in a FIFO than you expect or other conditions like frame error).

嗨，Jcandle，我还尝试了一步一步的调试，观察ISR的执行情况。它正在清除不规则的旗帜，但是在“继续”执行之后，它又在一段时间后进入ISR。当我只发送一个字节时，它可能不是“FIFO中的更多数据”的可能性，我们也可以看到RX缓冲区中的有效数据，也可能与框架无关。



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    Hi Jcandle, I have also tried step-by-step debugging and observed the execution of ISR. It is clearing the inetrrupt flag but again after "continue"ing execution it come in ISR after some time.  As I am sending only single byte then it may not be possibility of 'more data in FIFO' and also as we can see valid data in RX buffer then also may not be problem with framing.

在RX上有上拉电阻吗？它可能是线噪声。



      以下为原文

    Do you have a pullup resistor on RX?  It could be line noise.

是的，我在RX引脚上有10K的上拉电阻。



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    Yes, I have 10K pull up resistor on RX pin.

你好，Ravic，我有UART使用回调中断RX。我的Tx是通过调用每个循环的函数从我的环形缓冲区转储到TX FIFO。注意，我也有UART错误中断之前，由于奇怪的行为，但似乎还好在OrthyV20501到目前为止（并且你不能禁用UART错误中断在MHCV2052）。我不使用UART错误回调，因为这个经验（我的协议校验和捕获错误，所以我没事）。我正在使用：PIC32 MZ2048 EFM144，MPLABXV355，XC32 V142，OrthyV20200 BPIC32 MZ2048 EFM144，MPLABXV415，XC32 V205，OrthyV20501注：从HV202B升级到HV20501是容易的：删除项目文件夹，然后删除所有旧的生成和编译的文件/文件夹，对.MHC和.xml文件进行开机，然后用最新的工具打开项目，在MHC中重新生成（手动启用ADC），对生成的代码进行定制（推荐您保留列表或使用工具，如Excel）。是“比较老文件夹与新文件夹，编译，它工作！代码提取附上：HV2XXUUART= RXCALBACKIVUVPR.TXTHORD，忙，所以没有时间把这个拆掉。希望你能理解这一点。包括参考和声帮助UART回调。保罗



      以下为原文

    Hi Ravic,
I have UARTs working in Interrupt for Rx by using Callbacks. My Tx is by calling a function every cycle to dump from my ring buffers to the Tx FIFOs. Note I also had UART Err Interrupts disabled previously due to odd behaviour, but it seems OK in HarmonyV20501 so far (And you can't disable UART Err interrupts in MHCv2052). I don't use UART Err Callbacks because of this Experience (My protocol checksums catch errors so I'm OK).
 
I'm using:
PIC32MZ2048EFM144, MPLABXv355, XC32 V142, HarmonyV20200b
PIC32MZ2048EFM144, MPLABXv415, XC32 V205, HarmonyV20501
 
Note: To upgrade from Hv202b to Hv20501 was easy this time:
- First I zipped the project folder, then I deleted all old generated and compiled files/folders, kepting the .mhc and .xml files, Then I opened project with latest tools, regenerated in MHC (manually enabling ADC), made my customizations to generated code (Recommend you keep a list or use tool like "beyond compare" to compare folders of older versus new, compiled, and it worked!!
 
Code Extracts attached:  Hv2xx_UART=RxCallback_V00PR.txt
 
Sorry, busy so no time to strip this down. Hope you can make sense of it. Includes reference to Harmony Help for UART Callbacks.
 
Paul
 
 
 
   Attachment(s)

Hv2xx_UART=RxCallback_V00PR.txt (5.57 KB) - downloaded 56 times

嗨，保罗，非常感谢你，你的回答对我来说是非常健康的，我会用我的代码尝试它，让你知道是否有任何问题将在那里。



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    Hi Paul, Thank you very much, Your answer is very healpful for me, I will try it in my code and let you know if any issue will be there.