Bootloader via CAN-bus for STM32H743
This bootloader works only with BANK1 of Flash memory.
Sector0 (0x8000000) - program of bootloader. After reset microcontroller always jumps to this address.
Sector1 (0x8020000) - user config data that can be erased and written by user program.
Sector2 (0x8040000) - user program. Can occupy all remaining sectors in BANK1.
After start running, bootloader waits CAN-messages with determined ID for some delay (default 2 sec). This delay can be set in user config data (Sector1).
After delay bootloader gives control to user program.
By default, bootloader communicates with two CAN-IDs: 0x560 and 0x570. If there are several boards on same CAN-bus, each board should identificate itself by writing its board-id to user config data (Sector1). Bootloader reads board-id and adds this value to CAN-ID expecting for program loading. For example, board-id is 2, so bootloader will wait CAN-messages with CAN-ID 0x562 and 0x572.
Messages with CAN-ID 0x56x are command messages to bootloader.
Messages with CAN-ID 0x57x are messages with program text bytes.
Baudrate of CAN-bus: 500 kbps.
0x8020000 - (uint32) config header: 0x0123fedc
0x8020004 - (uint32) board-id: from 0 to 0xF
0x8020008 - (uint32) delay before jump from bootloader to user program.
Units - milliseconds.