How to use SPI with stm32F429 connected to W5500?

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How to use SPI with stm32F429 connected to W5500? [Copy link]

 

Use stm32f429's SPI5 to connect to W5500 and call the SPI5's DMA channel

Set as server and PC as client.

The program uses the officially downloaded driver, which has been modified to support DMA.

In terms of configuration, the SPI configuration is the default configuration of cubemx, 4 division (22.5M), all SPI pins have no pull-up or pull-down, and the speed level is the fastest. DMA is in normal mode (non-circular mode).

The server can be connected to by the client, and there are no problems in sending and receiving dozens of bytes of data. It can read and write registers, etc.

According to the protocol, the PC sends a file to the server for storage. It sends a frame of data, and the server returns a frame of ACK, one by one. In this process, a problem occurred. The waveform captured by the oscilloscope is as follows

Red is MOSI, yellow is MISO, green is CLK, and blue is one of my trigger signals.

The problem is that in the long level area of MISO, the MCU is reading the cache data of W5500, and MISO should be output, but at this time, it is not output, and the level is not low, but an intermediate level, and MOSI is also an intermediate level and cannot be pulled low.

I have tried configuring the pins to pull up and down in the software, but it didn't work and the phenomenon was the same.

I checked the program and found that there is no other configuration for these SPI5 pins. I used the TCP debugging tool to send it and randomly selected a frame of data. The same phenomenon still occurred at the 59th frame. But not all frames are in this frame.

Jumper, use the SPI3 pin, jumper to the W5500, and the problem does not occur.

I have several boards with the same problem. Is there any problem with the SPI5 of F429?

火辣西米秀

Check if the power supply voltage meets the standard value. If
the client or server that establishes a connection with W5500 detects that the sent data is illegal, it will disconnect automatically.

It is recommended to use the network debugging assistant to confirm whether the sent data is illegal.

麻袋

The connection is not disconnected. After reading these 1050 bytes, the register is read and written again, and the returned value is correct. The next frame can be read. From the packet capture by Wireshark, the data sent is also correct.

The voltage of W5500 captured at this moment has relatively small ripple and no sudden change.

nmg

I shared your question in our evaluation group. I will share the following suggestions from two group members for your reference:

1、spi最好是使用前两个，鬼知道后面几个是不是有啥bug，一般情况下PA4-PA7不要接别的元器件，预留给SPI用，我甚至遇到过SPI2跟串口3的DMA接收起冲突...ST的东西，最好是别整花活，不然排查问题影响效率，串口和SPI都用前两个，I2C用第一个，PB6 PB7

2. I suspect it is a DMA conflict.

麻袋

nmg Published on 2022-11-16 16:34 I shared your question in our evaluation group. I will share the suggestions given by two group members for reference: 1. It is best to use the first two for spi. Who knows...

The problem was found. There was an SPI FLASH on the development board, which used these 4 pins. There was competition. When laying out the board, I didn't pay attention to the IO pins on the development board.

nmg

Madai published on 2022-11-16 19:10 The problem was found. There is an SPI FLASH on the development board, which uses these 4 pins. There is competition. When the board was laid out, no attention was paid...

This error is so difficult, how did you find it?

麻袋

nmg posted on 2022-11-17 11:04 This error is so difficult, how did you find it out?

A colleague mentioned it, and when we checked the core board, we found the IC. We had been checking our own source code, SCH and PCB, but we couldn't find it. It was probably our own negligence.

麻袋

nmg posted on 2022-11-17 11:04 This error is so difficult, how did you find it out?

Because it is not always wrong, most of the data transmission and reception are correct, and I have checked the program for a long time. Maybe in some data frames, it just happens to encounter some command ICs of this SPI FLASH.

starcat123

Madai posted on 2022-11-16 19:10

Awesome, learned from the masters

The Taobao order I just placed includes the W5500 module development board. I hope I can learn this soon.

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starcat123 posted on 2022-12-1 16:37 Awesome, I learned from the big guy. The Taobao order I just placed has the W5500 module development board. I hope I can learn this soon.

Come on, come on

damiaa

429 is better with its own Ethernet, it is not so convenient to hang a w5500.

WIZnet released w5500 and w7500 but didn't release any new ones. I don't know why. Logically, w7500 would have a wider range of applications if it had more memory.

On the contrary, the domestic situation is getting better and better.

麻袋

damiaa posted on 2022-12-15 10:12 429 is better with its own Ethernet. It is not so comfortable to hang a w5500. WIZnet has not made any new ones since it released w5500 and w7500. I don't know...

Well, we have a requirement of 4 network ports, so we still need an external plug-in.

W1234w

Madai published on 2022-12-19 13:38 Well, we have a requirement for 4 network ports, so we still have to use an external plug-in

Hello, I am also working on f429dma w5500 recently. Can you share a software reference? Thank you very much.

麻袋

W1234w posted on 2023-11-12 22:55 Hello, I am also working on f429dma w5500 recently. Can you share a software reference? Thank you very much

I'm sorry that I didn't simplify the company's program. But this is not very difficult. At that time, both SPI DMAs came out, and the other one just had problems occasionally, which took a long time to troubleshoot.