The serial port assistant can receive commands, but when connected to the light source, the light source does not respond. Why?

xbxdbd

The serial port assistant can receive commands, but when connected to the light source, the light source does not respond. Why? [Copy link]

 

Make a button to control the brightness of the light source, and then press the button. The serial port assistant can also receive the data command, but if I connect the light source, the light source does not respond. I connect the light source to the computer and use the serial port assistant to send this command twice. The light source can be turned on and off. Why is there no response when the button controls the light source connection? The button control light source command is the same as the sent command, but there is no response. What is the reason?

maychang

[The button control light source command is the same as the sent command]

Logically speaking, your [button control light source command] must be different from the [sent command]. If they were the same, it should work normally and you wouldn't be on the forum.

[Different] Even the plug and socket are not properly plugged in.

秦天qintian0303

How is the light source powered? Check if it is a power problem.

xbxdbd

maychang posted on 2024-1-11 10:52 [The key control light source command is the same as the command sent] Logically speaking, your [key control light source command] must be the same as the [command sent] ...

This is the command sent by the serial assistant after the light source is connected to the computer. The light source can be lit. This is the command received by the serial assistant when I connect the light source circuit to the computer with the key control. However, the light source does not respond when my key control light source circuit board is connected to the light source

xbxdbd

Qintianqintian0303 posted on 2024-1-11 11:01 How is the power supply of the light source? Check if it is a power supply problem

The power supply is normal

lugl4313820

First of all, you need to understand the communication protocol, what do the bits mean, is there CRC, etc. I suggest you elaborate on the problem so that the experts will know how to help you.

Also, after pressing the key, is the baud rate of your serial port output correct? Have you used a logic analyzer to check if it is correct? Sometimes the baud rate of the computer and the waveform of the microcontroller may not be correct.

Please upload the waveform (preferably an oscilloscope), logic analyzer, and other data, otherwise everyone will just guess at the answer, which is meaningless.

wangerxian

Are the flow control pins enabled?

xbxdbd

wangerxian posted on 2024-1-11 14:38 Is the data flow control pin enabled?

Not enabled

qwqwqw2088

When the button is pressed, the serial port assistant can also receive data commands.

Check whether the key serial port configuration is correct, and whether the baud rate, number of bits, stop bits, and check bits are correct.

Can receive data commands, the serial port may not be opened or occupied.

xbxdbd

qwqwqw2088 posted on 2024-1-11 21:23 When the button is pressed, the serial port assistant can also receive data instructions. Check whether there is any problem with the configuration of the button serial port, baud rate, number of bits, stop...

I set up

in CUBEMX. PA9 and PA10 PA2 and PA3 are connected to the serial screen. The key device and the light source device can communicate normally with the computer serial port assistant, but these two devices cannot communicate. The command sent by the light source device must be sent twice before it can be executed. This is the command received by the key device . When the key is pressed, it is a high level, and the baud rate is set to 115200. It is strange that the two devices cannot communicate. Another problem with the key device is that if I don't press the key, it can automatically receive the key output command.

wangerxian

xbxdbd posted on 2024-1-11 14:55 Not enabled

Are both the receiving and sending ends programs written by yourself?

qwqwqw2088

xbxdbd posted on 2024-1-12 09:06 I set up two serial ports in CUBEMX, PA9 and PA10 PA2 and PA3 are connected to the serial port screen, the button settings...

Two devices cannot communicate?

Why does it feel like a hardware connection problem?

xbxdbd

qwqwqw2088 posted on 2024-1-12 20:43 The two devices cannot communicate? Why does it feel like a hardware connection problem?

Hardware connection? What could be the reason?

xbxdbd

wangerxian posted on 2024-1-12 17:27 Are both the receiving and sending end programs written by yourself?

It is not just about writing the program for the button light source control circuit. The program for connecting the light source circuit has already been written by others.

wangerxian

xbxdbd posted on 2024-1-15 08:54 It is not just a program for the key light source control circuit. The program for connecting the light source circuit has been written by others.

Then you can change it, just change it to the same serial port configuration.

xbxdbd

wangerxian posted on 2024-1-15 09:17 Then you can change it, just change it to the same serial port configuration.

I have seen the serial port configuration

The following figure is the key serial port configuration

wangerxian

xbxdbd posted on 2024-1-11 11:41 This is the command sent by the serial port assistant after the light source is connected to the computer. The light source can be lit. This is my key control of the light source...

How can a button-controlled light source circuit send several packets of data at a time?

xbxdbd

wangerxian published on 2024-1-15 09:46 How to send several packets of data at a time using a button to control the light source circuit?

Yes. And it should be that when the button is pressed once, the serial assistant receives the data, but this is not the case. At the beginning, it is 0000. Then I press SW1 and it sends data, and sends a series of repeated data. Logically, when I press SW1 again, it should receive the data of the LED off instruction, but there is no response. Then, if I don't press the button, it keeps receiving data automatically. I'd like to know what's going on, because this is my first time writing code. This is the button program.

wangerxian

Did you process the 00 data at the beginning when your serial port receives it? You can use the serial port tool to send a lot of 00s first and then send the command to see if you can control it successfully.

wangerxian

If control fails, it means there is a problem when parsing the serial port data.