play-stm32 / bootloader

This a in-application programming (IAP) bootloader, it can upgrade firmware from sd card and boot os. Only for my stm32f407 board (openedv mini board), you can edit these codes to make it work on your device

This a in-application programming (IAP) bootloader

Supported feature

• Upgrade firmware from sd card
• Use usb-ttl to show log

Step

Ready

• A fat32 card (only sdhc card)
• Rename your firmware to firmware.bin (the format is bin not elf)
• Copy your firmware to the card's root
• Insert card

Power Up Board

• Check the bootloader works well (green LED light)
• Auto upgrade if card has install file in the root
• OR press KEY0 to upgrade (green LED dark and red LED light)
• Wait

Attentions

Partition information

• Bootloader: 0x08000000 to 0x0801FFFF (128KB)
• Firmware: 0x08020000 to 0x080FFFFF (896KB; Sector from 5 to 11)

USB-TTL (CH340)

• Baudrare: 115200
• Data Bits: 8
• Parity: none
• Stop Bits: 1

How to turn elf to bin

arm-none-eabi-objcopy -O binary target/thumbv7m-none-eabi/debug/xxxx firmware.bin

Console log

This is a IAP bootloader
start to check for upgrade from sd card

found firmware
if you do nothing, it will boot os in 5 seconds
if you want to upgrade, press the KEY0

upgrading
start to erase flash, it will take minutes
erase flash successfully
start to upgrade firmware
upgrade successfully

boot os

Download

• Download artifacts from Actions

Relevant Project

• sdio_sdhc
• fat32