Bootloader for STM32L452

Original project: https://github.com/akospasztor/stm32-bootloader

Modified by CEP to support STM32L452

Behavior

1. Initialize peripherals (HAL, Clock, GPIO, SPI, UART, FATFS)
2. Print Bootloader Information
3. Mount SD Card
4. On presence of firmware file on the SD card
   1. Erase Application space on Flash memory
   2. Write firmware file content on Flash memory
   3. Verify rightness of the written content
   4. Erase firmware file from SD card
   5. Any error in previous steps cancel the flashing procedure
5. Unmount SD Card
6. De-Initialize peripherals (HAL, Clock, GPIO, SPI, UART, FATFS)
7. Jump to application

Requirements

The firmware file must be called Scale.bin and must be located at the root of the SD Card

On the application code (not bootloader)

In system_stm32l4xx.c, you must update VECT_TAB_OFFSET to 0x8000

In STM32L452RETX_FLASH.ld, you must update the memory definition to

/* Memories definition */
MEMORY
{
  RAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = 160K
  FLASH    (rx)    : ORIGIN = 0x8008000,   LENGTH = 480K
}