带USB串口的低端pic

PIC16F1454



      以下为原文

    PIC16F1454

与Vloki一致：PIC16F1454。如果你想要现成的解决方案，看看MCP2221http://www..hip.com/www./en/MCP2221.FS USB需要48MHz，但是CPU可以运行得更慢。



      以下为原文

    Concur with Vloki:  PIC16F1454.
 
If you want a ready made solution, take a look at the MCP2221 http://www.microchip.com/wwwproducts/en/MCP2221.
 
FS USB requires 48MHz, but the CPU can run slower.

PIC16F1454是一个很好的起点，但是请记住，由于USB是实时的，并且ICD等没有太多限制，所以不能使用传统的调试方法来轻松地调试USB……对于真正的调试，您需要一个USB总线嗅探器。



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    PIC16F1454 is a good starting point but keep in mind that you cannot easily debug USB using conventional debug methods as USB is live and in real time so ICDs etc. aren't much chop...
 
For real debugging you need a USB bus sniffer.

对于我来说，询问USB和一个“...慢”的处理器不是一回事。我只是想知道OPs的队列是否被稍微误解了：在“USB-Serial”中，我们是在讨论一个单独的设备（比如FT232），它完成所有USB方面的工作，并且简单地向t提供一个串行接口。PIC（在这种情况下，几乎任何带有UART的MCU都可以）或者我们正在谈论内置USB外设的设备（正如其他人所解释的那样）。问题的“调试”部分也困扰着我——OP是否真的在询问允许调试的引导加载器？我想我们需要OP再来问清楚问题。苏珊



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    To me, asking about USB and a '...slow' processor do not go together.
I'm just wondering if the OPs quesiton has been slightly misinterpreted: by 'USB-Serial' are we talking about a separate device (such as an FT232) that does all of the USB side of things and simply presents a serial interface to the PIC (in which case just about any MCU with a UART will do) or are we talking about a device with a USB peripheral built in (as the others have interpreted the question).
The 'debugging' part of the question also bothers me - is the OP really asking about a bootloader that also allows debugging?
I guess we need the OP to come back and ask the question more clearly.
Susan

PIC16F1454。它不需要水晶，可以从USB的5V运行。你不能比这更小和更简单。



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    PIC16F1454. It doesn't require crystal and can be run from USB's 5V. You cannot go smaller and simpler than that.

I*是指内置USB接口。我认为这将比一个外部USB串行芯片便宜。而且，我熟悉调试像USB这样的实时事物。最糟糕的是，我会中断事件，然后完全重新启动。自从我发布问题后，我使用了参数搜索，并提出了PIC18F2450，但现在我肯定会检查PIC16F1454。谢谢大家，直到我的下一个问题。



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    I *was* referring to a built-in u***.  I assumed that would be cheaper than an external u***-serial chip.  Also, I am familiar with debugging real-time things like USB.  At worst I'll break on events and then totally restart.
 
Since I posted the question I used parametric search and came up with the PIC18F2450, but now I'll definitely check out the PIC16F1454.  Thanks to all until my next question.

我检查了PIC16F1454和WOW，它包了很多14针。我很惊讶，它可以与USB交谈没有晶体。当我做了一个参数搜索和选择USB它隐藏PIC16F后的PIC18F。它似乎是按价格排序，但它不是。我偏执的自我怀疑如果他们隐藏他们故意（JK）。有一件事，我需要澄清，我已经困惑了一段时间。如何判断芯片是否可以在不增加额外硬件的情况下进行真正的HW调试（HW断点）？换言之，只需将5针连接到电路板芯片上？数据表和比较表从未使这一点完全清楚。



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    I checked out the PIC16F1454 and wow, it packs a lot into 14 pins.  I'm amazed that it can talk to USB without a crystal.  When I did a parametric search and selected USB it hid the PIC16F's after the PIC18F's.  It appeared to be ordered by price but it wasn't.  My paranoid self wonders if they hid them on purpose (JK).
 
One thing I need clarified that I have been confused about for some time.  How can I tell if the chip can do real hw debugging (hw breakpoints) without adding extra hardware?   In other words, just hooking up a pickit3 with the 5 pins to the in-circuit chip?  The datasheets and comparison tables never make this totally clear.
 
 

是的，你可以用PICTIT3调试16F145X。



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    Yes, you can debug the 16F145x with PICkit3.

PIC16F145X有3个断点-比大多数其他PIC16更多。



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    PIC16F145x has 3 breakpoints - more than most other PIC16.

关键是当你碰到断点时，你可能会松开USB，因为它不会等你。



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The Point was that when you hit a breakpoint you may loose the USB since it will not wait for you.

你几乎失去了一切，因为这个世界不会支持你。但就是这样。你碰到了断点，你检查发生了什么，你可以做一些步骤，但你不能继续，必须从头开始。



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You lose pretty much everything as the world will not stand by for you. But that's just the way it is. You hit the breakpoint, you inspect what's going on, you may do some steps, but you cannot continue and must start from the beginning.

谢谢大家。我从DigiKy订购了SOMPEIC16F1454，我期待着和他们一起玩。



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    Thanks everyone.  I ordered some PIC16F1454s from digikey and I'm looking forward to playing with them.

漂亮的USB16F1459应用程序：http://www..hip.com/promo/u***-keypad-.在调试USB命令时，周围应该有一些低成本的USB分析器。总的阶段，莱克罗伊，和其他一些。



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    Nice USB16F1459 application:
http://www.microchip.com/promo/u***-keypad-demonstration
 
On debugging USB commands, there should be a bunch of lower cost USB analyzers around. Total Phase, LeCroy,
and a few other ones. 

获取MLA并至少安装USB部分..../mla/v2016_08_08/apps/u***/device/cdc_basic/固件/low_pin_count_u***_development_kit_pic16f1459.x包含一个应该是良好开始的项目。



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Get the MLAand install at least the USB part.
.../mla/v2016_08_08/apps/u***/device/cdc_basic/firmware/low_pin_count_u***_development_kit_pic16f1459.x
contains a project that should be a good start.

如果需要分析或嗅探工具，可以查看http://freeu***analyzer.com/（我认为使用MLA中的示例，没有必要）



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    If you need an analyze or sniffer tool you may have a look at http://freeu***analyzer.com/
(I think with the example from MLA it should not be necessary)

是的，我也要指出。除非“特殊应用”正在开发中，否则不需要USB分析仪（也没有断点）。



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    Yeah, I was going to point it out as well.
Unless "special applications" are under development, no USB analyzer will be needed (and no breakpoints too )