如何使用MSO9104A解码SPI等协议？

据我所知，对于4线SPI，你需要有一个真正的芯片选择（一个有效和无效），否则解码器无法判断实际数据传输何时开始。
但是，我可能错了。
正确选择通道后，如果有数据正在运行，请单击“自动设置”。
范围应该自己解决所有其他问题，包括时间，阈值等。你试过吗？
如果它说你没有足够的边缘，那么深度不够高，或者阈值设置不正确。
人



     以下为原文

  As far as I know, for 4 wire SPI, you need to have a real chip select (one that goes active and inactive), otherwise the decoder can't tell when the actual data transfer starts. I may be wrong, however.

Once you have chosen the channels correctly, if you have data running, then click 'Auto Setup'. The scope should figure out everything else out on its own, including timing, thresholds, etc. Have you tried that?

If it says you don't have enough edges, then either the depth isn't high enough, or the thresholds aren't set right.

Al

我的设备没有芯片选择。
有一个主设备和一个药剂设备。
它们之间的电子连接只是MISO，MOSI，CLK，VDD和GND。
我尝试使用VDD作为芯片选择（高电平有效）。
它总是说“不能执行串行解码;没有足够的边缘”。
我有几次解码显示，但结果是错误的（解码不是指时钟）。
我正在寻找一种有效且可靠的方法来解码非标准SPI的串行信号。



     以下为原文

  My device doesn't have chip select. There are a master device and a salve device. The electronic connections between them are just MISO, MOSI, CLK, VDD and GND. I tried use VDD as chip select(active high). It always says "can't perform serial decode; not enough edges". I have a couple times that the decode displays, but the result is wrong (the decode is not referring to the clock).

I am seeking a efficient and reliable way to decode the serial signal that is non-standard SPI.

由于您使用的是非标准SPI，因此可能无法按照您的要求进行操作，但您可以尝试使用。
如果这不起作用，则此范围没有解决方案。
要执行以下操作，您将需要当前范围SW，或至少3.20或更高版本。
如果你没有这个，你将需要从这里更新SW：[http://www.agilent.com/find/scope-apps-sw]您可以将您的链接视为2个2线SPI链接
，有独立的时钟。
将2个通道连接到时钟线，1个通道连接到MOSI，1个通道连接到MISO。
现在分别设置每个链接。
如果它工作，你应该最终得到2个SPI解码列。
每个方向的配置，因为给定的通道只能使用一次。
祝你好运。
人



     以下为原文

  Since you are using non-standard SPI it may not be possible to do what you want, but there is something you can try. If this doesn't work, there is no solution with this scope.

To do the following, you will need current scope SW, or at least version 3.20 or later. If you don't have that, you will need to update with SW from here:  [http://www.agilent.com/find/scope-apps-sw] 

You could think of your link as 2 2-wire SPI links, with separate clocks. Connect 2 channels to the clock line, 1 channel to MOSI and 1 channel to MISO. Now go through and set up each link separately. If it works, the you should end up with 2 SPI decode columns. The configuration for each direction, since a given channel can only be used once.

Good Luck.

Al

我试过2线SPI，但我不知道如何设置时钟超时和字大小。
默认设置不起作用（仍然无法解码;边缘不够）。
当我将时钟超时更改为接近时钟周期和字大小= 8（我的串行通信为8位）的13 us时，它似乎显示正确的解码。
但是，如何运行两个2线SPI解码来比较MISO和MOSI？
非常感谢。
你做了很棒的故障排除。编辑：jenaflex于2012年6月21日下午2:53



     以下为原文

  I tried 2 wire SPI, but I don't know how to set the clock timeout and word size. The default setting doesn't work(still cannot decode; not enough edges). When I change clock timeout to 13 us that is close to the period of clock and word size=8 (my serial communication is 8 bit), it seems shows the correct decode. However, how can I run two 2-wire-SPI decode to compare the MISO and MOSI?

Thanks a lot. You did awesome troubleshooting.

Edited by: jenaflex on Jun 21, 2012 2:53 PM

您的示波器SW是什么版本的？
如果您是最新的（版本3.50），那么您应该能够独立解码并同时显示2个串行流。
我无法访问9000系列示波器，因此无法向您提供有关如何操作的准确说明。
人



     以下为原文

  What version is your scope SW? If you're up to date (Version 3.50), then you should be able to independently decode and display 2 serial streams at the same time. I don't have access to a 9000 series scope, so I can't give you exact directions on how to do it.

Al

我的软件版本是02.00.0003我的固件版本是Main 204 Trg 6.2 Ser 3.9.3现在我只有1通道串行解码。
2线SPI工作正常，但4线没有。
我还计划通过MATLAB读取示波器数据。
软件和固件版本是否会影响我的MATLAB脚本的结果？



     以下为原文

  my software revision is 02.00.0003
my firmware revision is Main 204 Trg 6.2 Ser 3.9.3

Now I just have 1 channel serial decode. 2 wire SPI works fine, but 4 wire doesn't. 

Also I plan to read oscilloscope data via MATLAB. Does the software and firmware revision influence the result of my MATLAB script?

>我的软件版本是02.00.0003正如我在6/21的帖子中所说，你需要拥有最新的SW，或者非常接近它。
目前的版本是3.50.something。
可在此处访问：http：//www.agilent.com/find/scope-apps-sw完成后，您将能够按照Kevin的说明进行解码。
更新将花费一两个小时，因为你已经落后了。
进行更新后，您必须在其上运行用户校准。
首先，在加载最新固件之前，应将其连接到Internet，并根据需要多次运行Microsoft Update，如果您有一段时间没有这样做的话。
确保获得所有最新的.NET补丁。
请记住，除了作为范围之外，它还是一台PC。
如果您没有防病毒软件，则应安装一些软件。
我推荐Microsoft Security Essentials（MSE）。
它是免费的，而且负载相对较低。
>现在我只有1通道串行解码。
2线SPI工作正常，但4线没有。
您没有“真正的”4线SPI，正如我之前所说，使用4线解码不会也不会起作用。
您需要将它视为2个2线SPI链路，它恰好共享一个时钟。
要做到这一点，你需要最新的SW，你将在时钟上使用2个探测器。
>我还计划通过MATLAB读取示波器数据。
软件和固件版本是否会影响我的MATLAB脚本的结果？
在某些情况下，是的。
在安装最新的SW时，请阅读“自述文件”文档，其中介绍了自上次更新以来添加的更改。
然后，查看“脚本和程序”部分以获取一些指示，包括示例。
如果你发布在那里，其他人将获得看到答案的好处。
人



     以下为原文

  > my software revision is 02.00.0003

As I said in my post of 6/21, you need to have the newest SW, or pretty close to it. The current version is 3.50.something. It is available here:  http://www.agilent.com/find/scope-apps-sw  Once you have done that, you will be able to follow Kevin's instructions to get the decode. The update will take an hour or two, since you are so far behind. You will have to run a user calibration on it after doing the update.

First, before you load the latest firmware, you should connect it to the internet, and run Microsoft Update as many times as necessary, if you haven't done that in a while. Make sure you get all of the latest .NET patches. Remember, besides being a scope, it's a PC. If you don't have antivirus SW, you should install some. I recommend Microsoft Security Essentials (MSE). It's free and relatively low-load.

> Now I just have 1 channel serial decode. 2 wire SPI works fine, but 4 wire doesn't. 

You don't have a "true" 4-wire SPI, so as I said earlier, using the 4 wire decode doesn't and won't work. You need to treat it like 2 2-wire SPI links, that happen to share a clock. to do that, you need the newest SW, and you'll use 2 probes on the clock.

> Also I plan to read oscilloscope data via MATLAB. Does the software and firmware revision influence the result of my MATLAB script?

In some cases, yes. While you are installing the newest SW, read the "ReadMe" document, that talks about the changes that have been added since you last updated. Then, look in the "Script and Programs" section for some pointers, including examples. If you post there, others will get the benefit of seeing the answers.

Al