Problem with internal CAN Bootloader STM32F7
Posted on July 13, 2018 at 08:05
Hello,
i have a problem with the internal bootloader of the STM32F7(67BI).
We have written a tool for communicating with the internal CAN bootloader. The request of the version and the allowed commands, as well as the erasing of the flash are successful.
But when writing it comes to an erroneous behavior. Different waiting times were tried. The same tool programs an STM32F4 successfully.
The problem is as follows:
sometimes during transmission the STM32F7 repeats its ACK message several times without having received data again. The data before the ACK messages are also written to memory just as often.
The following pictures show the transmission and the read-out memory after the transmission:
The first 6 frames (6x8 Byte / 48 Byte @ 0x..00 to 0x..2F) were written correctly. The 6th frame was written twice into the memory (correctly @ 0x..28 and @ 0x..30) and the following frames were shifted by one frame size. This is repeated at irregular intervals and with several bytes of shifting.
Unfortunately I did not find any information or Erata. To what extent are there any undocumented changes between the bootloader on the STM32F4 and the STM32F7?
Thank you in advance for your help.
