STM32 CAN LOOPBACK Mode || FILTER Configuration 

Yes you are correct. That part seems to be messed up. But I explained how masking works, so if someone wants to build a filter for multiple devices, they should consider that. Thanks for informing about it though... I can't change the video, but I will update the article.

Next Sunday.. Go through this video also. I am not going to explain everything in that one. Specially the filters..

@@ControllersTech I'm checking all your videos and making lab tests on my desk.

This is not true for all STM32 MCUs.

In fact, shorting CANH and CANL would be harmful and should not be done in any case. Even if loopback wasn't handled internally you only should short CAN_RX and CAN_TX pins, not CANH and CANL

@@user-zi8jn1go8k yes, you are correct, the connection should be CAN_TX -> CAN_RX (if not done internally). On the other hand, generally a CAN transceiver will survive a short between CANH and CANL, but of course it's not recommended

@@user-zi8jn1go8k Sure? We tested many times and I don't think that's risky.

@@hoantran4002 while most CAN devices would survive shorting CAN_H and CAN_L it is of course not advisable nor useful. CAN bus works on difference between H and L levels so if you short them out, you not only create stress on transmitters, but you effectively equalize the voltage level on both lines and stop any communication on the bus.

I'll look into it.

I use SIM800 using an Arduino pro mini (naneado, with Arduino Nano firmware, for use the watchdod, for real oil industrial applications, thus, I need the watchdow enable, arduino pro mini have a bad bootloader, then does not allow use watchdog, then I load Optiboot 8.0) I use Arduino like drivers for many many many devices (I do not reinvent the wheel or develop my drivers, arduino has a lot of development behind it, and I use that development for my profit. like modbus, neopixel, etc.) Then, I use Arduino to read my PLCs and transmit data from GPRS (2G) to MQTT broker. For strong calculatios, I send data from arduito via I2C or SPI to STM32, dsPIC, etc. (for example quaternion integration from MPU DMP)

I use accelerometers to lift the dynamometric charts on rod pumps, I need accurate data from an accelerometer, as well as vibration calculations, for that, I receive the quaternion from the DMP (digital motion processor) and save myself many times from using Kalman filters to do my own sensory fusion. When I need some LQG, Kalman, PID control, I use matlab and simulink coder to generate ansi C / C ++, for dsPICs or STM32. I use Arduino like driver for the MPU, then transmit the quaternion data to STM32 via I2C and STM32 proccess the data, and another arduino transfer data via SIM800.

I want to earn money, and develop quickly, develop development as quickly and safely as possible. Behind a microcontroller as cheap as the Atmega 328p, there is a community that develops drivers for thousands of devices, values that work and uses Arduino as a driver. As an electronic I am not going to program or develop as well as those thousands of programmers who make extensive libraries for Arduino. Uploading data to AMS or Microsoft Azure, or to any MQTT broker, is already successful with Arduino or ESP8266 or ESP32 at an extremely cheap cost. I challenge you to develop something like this for STM32, noooo, I want to make quick money using IoT, I have everything solved.

The Strom Trooper with the Baby Yoda was personal. 💀💀

You need to Purchase the analyzer hardware.

yes it is c

@@ControllersTech okay, thank you

It's the cheapest one you can find anywhere

did you find the problem? I'm facing the same as you.

@@alef-assert same here. any solution?

@@maxgertner6870 Yes. I don't know why, but I needed to give a delay of 1 ms after sending the message. I did this and it worked to loopback mode.

It's a standard. Most devices use 500k. You can choose something else also..

Of course not. 2515 is SPI based device. You need another similar transceiver only device like TJA1050.

​@@ControllersTechI need to send data from stm32f4 to raspberry pi 4 using CAN bus when i communicate the stm32f4 with mcp2515 and the raspberry pi with the other mcp2515 and of cource the two mcp2515 are connected to each other IS that work ?

If that do not work what Can use so ?

It will work if you do it properly.