Hello the information you probaly are looking for is in the file:/Middlewares/Third_Party/emotas_CANopen/emotas_CANopen/Documentation/readme.txtI'm sorry that it's a little bit hidden but ST did not allowed us to place it directly in the project root...
Did you call HAL_CAN_Start() somewhere in your code?Also uint8_t TestData[7] should be uint8_t TestData[8].If you are using CubeMX you could have a look into:STM32Cube/Repository/STM32Cube_FW_F7_V.15.0/Projects/STM32F723E-Discovery/Examples/CAN/CAN_...
Hello tor7767,How did you setup the BTR register?Maybe MX_CAN1_Init() resets your configuration, since it clearly doesnt meet your setup of 250kbps, Sampling point 70%, SJW 2 Tq
