after pressing button led is not blinking in stm32103c8 and 446re only while button pressed in logic 2 signal is showing not blinking led please help me

Send other data bytes as null ('\0').

interested

CAN protocol uses differential signals to communicate. However, the MCU we are using can't produce differential signals. Therefore we need extra IC chips, CAN transceiver in this case to produce differential signals. Also, if we are measuring any differential signals our MCU can't sample those signals. In this case too we need extra chip to intake differential signal and produce single ended signal so that our MCU can sample those signals. Hope that helps.

Also, CAN protocol has multiple advantages over plain Serial(you mean, UART since CAN is kinda Serial too,) . 1. distance 2. Noise immunity 3. Multiple nodes communication

First start with loopback mode (previous video). That's more suitable for error checking

What USB cable ?

On one hand and from the blue-pill you connected the four wires cable (3V3, SWDIO, SWCLK, GND) probably to your pc through ST-LINK. On the other hand you connected the android cable that normaly powers the blue pill. I want to know if it was necessary to connect this second cable on the blue-pill and where have you connected that one (also on your PC)? Thanks in advance? As a matter of fact, I have not yet used the blue-pill although I have it. I need to use it now from canbus application and your tutorial has help me a lot to undersatand this application. The matter is that I just know that in order to program with blue-pill I just need to connect my blue-pill with st-Link that will also send datas and power my blue-pill board. I want to know what led you to connect both sides of the blue-pill. Your response will help to have an information that I don't know about blue-pill connections.

Yes it is possible. but rember that bluepill only supports usb device mode, so plan the things according to that

@@ControllersTech hello sir is these vedio useful to receive can message using stm32f103c8t6(blue pill) and sent to uart if not tell me a way to do please

Yes. Just send the RxBuffer to the UART.

The link to the video (Filter configuration) and the entire playlist is in the description.

Did you solve that problem ??

I'm facing the same problem. Did you solve it?

@tantrung7398 @ziademad53 I've solved the problem. For me adding "HAL_Delay(1)" after the Tx function fixed my problem.

It's the sealogic analyzer.

@@ControllersTech Thank you sir

It's a chinese clone i guess. Around $7..

I have one of these. It measures up to 24MHz. If you're not looking for very high speed, then one for

@@ControllersTech Thanks!

CAN analyzer (name or purchase link please)

Does the cheep chinese clone wont work with the Logic2 software use? I only see the 'official' Sealogic devices are supported.... @@ControllersTech

1. Yes the hal code remains same across all stm32 devices. The number of filter banks might be different, so check your reference manual. I have explained it in one of the videos. 2. Sending data using can - that's what this video is about.

@@ControllersTech thank you

Yes you need logic analyzer.

@@ControllersTech are you refering to hardware?

Yes

"where did you said this and why" at 11:00, I said it's just to demonstrate. I just wanted to show that either of the fifos can be used. "what is the difference what happens if I keep it 0", basically nothing. It doesn't make any difference

No. It's not needed.. check the rx and tx with oscilloscope or logic analyser..

@@ControllersTech okay, do i need to send the message again and again. As in my case i send a message and other controller waits for reception

No. That's not the case. If you are doing everything as explained, it should work in a single attempt. Check the terminating resistances, the wires if they are connected properly..

Try it. If it doesn't work, then use the filters and set them to 0

Yes it is possible to connect them without the CAN transceivers. You are taking the video in a wrong way. Please don't see the video as "Communication between MCUs using the CAN protocol", because no one in their sane mind will use the CAN to communicate between the MCUs, when you have other options like UART, I2C, SPI, etc. This video rather demonstrates "how to use the STM32 as CAN Master and CAN Slave", "How to transmit messages on the CAN Bus" and "how to receive correct message from the CAN Bus".

@@ControllersTech Why wouldn't you use CAN, it has a much longer length between nodes than usart, i2c and spi

Yes

Can those two filterbank values ​​be the same?

Why would anyone want to do something like that ?

I need to interface CAN BUS 1 output from one device to UART input on a different device.@@ControllersTech

@@ControllersTech i have one device that sends info through CAN BUS 1 and an other device that has a RX and TX that is normaly meant for UART connection. This is for a project where I am building a drone. The OSD info from flight controller is sent out via CAN BUS 1, the FPV camera overlay this info. But it does not have CAN BUS 1 and only have UART connection. Any idea on how I can go about this? Hope you can explain. Thank you.

You can use your STM controller to read the message from canbus and then After receiving the message, send it via the uart.

debug the code to find it out. Maybe you are transmitting messages at a very high rate.

Yes

Check the can playlist. There are videos on FD CAN as well.

Issue Resolved -thanks

Txmailbox is used to send the can frame. The F4 board I was using has 3 mailboxes, so we can queue up to 3 frames for transmission. Then the frames can be sent based on the priority of the message. In the video I didn't utilize much of the mailbox's features, so it was only used for transmitting a single frame.

Ofcourse it's there. Check the cubemx part properly

@@ControllersTech thank you ... yes i found it

Mcp runs at 5v. The tx and rx pins don't.

@ControllersTech but on the datasheet it says that te txd and rxd runs on Vdd +- 0.3V. And Vdd is 5V.

Even if they do, a lot of pins in the STM32 MCUs are 5v tolerant. I am sure the CAN pins are among those.

I GOT THE SAME PROBLEM!!!

No. Can uses differential signals, where the 1 and 0 are represented by the difference in the level of CANH and CANL. Whereas Uart uses the simple high and low. 1 is represented by high and 0 by low.

@@ControllersTech sorry, I explained wrong. Is it possible to send a previously received rxCAN message through the UART port?

Yeah you can send. It's store in a buffer right, just send that buffer

@@ControllersTech thanks for your answer, that's what I have tried but I still have an error. If you want, you can see the video on my channel where I show my problem.

@@7juan17 1. Where is the filter configuration ? 2. Debug your code, and check the content of the canrx.

You need an analyzer for that. The software depends on which brand you are using.

@@ControllersTech brand?

@@ControllersTech I am following your same tutorial for learning and testing purpose

I have a cheap chinese clone. It's sealogic

I want to see the tx and rx through this analyzer as you did in the tutorial. Its not free?

connection diagram is shown on the webpage.. The link is in the description.

:@@ControllersTech for the Master 446 is the entire code loaded (and powered) thru the USB port ?; for the F103 4 pin Link and usb are cabled - is the USB connection for power? -and is the 4 pin link going to a PC USB port . Other ends of cable(s) to power source and download path not shown -same with multi devices don't want to mis connect system (s) Not sure how to physical feed the code to Master and slaves from cube IDE Walk thru all code and all tutorials -several times until I understood-appreciate the details - Have a good understanding of the Can BUS std just not sure of hardware /upload connects : retired engineer ( old school) still have my sliiderule - mentor for robotic team now

Issue Resolved - thanks