Uploaded January 2026 | Updated September 2026, 2 weeks ago
Build an *STM32 OTA request mechanism* that allows the application to tell the bootloader when a firmware update is required, using a Flash-based OTA flag.
In this tutorial, we continue the STM32 custom bootloader series and implement an *OTA FLAG mechanism* using the application header. The application sets the OTA flag in Flash and resets the MCU, allowing the bootloader to detect the request after reset and decide whether to start the OTA process or continue with normal application validation.
The bootloader reads the OTA flag, clears it after detection to prevent repeated OTA requests, and then enters the OTA update flow. Since the actual firmware flashing is implemented in the next part, we use an external button to simulate the OTA request and a blinking LED to represent the OTA flashing state.
#STM32 #STM32Bootloader #EmbeddedSystems #Bootloader
📁 *Download Project Files & Full Article:* controllerstech.com/stm32-ota-bootloader-flag-mechanism
📁 *STM32 Tutorials:* controllerstech.com/stm32-tutorials
📁 *ControllersTech Home:* controllerstech.com
### ▶︎ Related Videos
1️⃣ *CRC Based Application Validation:* youtu.be/8-HSYugyeA8
2️⃣ *Complete STM32 OTA Firmware Update:* youtu.be/iwxWuUbizVA
3️⃣ *STM32 Custom Bootloader Playlist:* youtube.com/playlist?list=PLfIJKC1ud8ghl0i_TIhAOmo4-7KXCMw63
🔔 *Subscribe for more STM32 and embedded systems tutorials!*
👍 Like and share if this tutorial helped you.
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Build an *STM32 OTA request mechanism* that allows the application to tell the bootloader when a firmware update is required, using a Flash-based OTA flag.
In this tutorial, we continue the STM32 custom bootloader series and implement an *OTA FLAG mechanism* using the application header. The application sets the OTA flag in Flash and resets the MCU, allowing the bootloader to detect the request after reset and decide whether to start the OTA process or continue with normal application validation.
The bootloader reads the OTA flag, clears it after detection to prevent repeated OTA requests, and then enters the OTA update flow. Since the actual firmware flashing is implemented in the next part, we use an external button to simulate the OTA request and a blinking LED to represent the OTA flashing state.
#STM32 #STM32Bootloader #EmbeddedSystems #Bootloader
📁 *Download Project Files & Full Article:* controllerstech.com/stm32-ota-bootloader-flag-mechanism
📁 *STM32 Tutorials:* controllerstech.com/stm32-tutorials
📁 *ControllersTech Home:* controllerstech.com
### ▶︎ Related Videos
1️⃣ *CRC Based Application Validation:* youtu.be/8-HSYugyeA8
2️⃣ *Complete STM32 OTA Firmware Update:* youtu.be/iwxWuUbizVA
3️⃣ *STM32 Custom Bootloader Playlist:* youtube.com/playlist?list=PLfIJKC1ud8ghl0i_TIhAOmo4-7KXCMw63
🔔 *Subscribe for more STM32 and embedded systems tutorials!*
👍 Like and share if this tutorial helped you.
******** SUPPORT US ********
🎁 Donate on Paypal: paypal.me/controllertech
🏆 Become a Member on Patreon: patreon.com/controllerstech/join
🎓 Join Youtube Membership: youtube.com/channel/UCkdqtSMnhYuMsJkyHOxiPZQ/join
🌐 *Connect:*
Facebook: facebook.com/controllerstech
Telegram: https://t.me/controllerstechdiscuss
Instagram: instagram.com/controllerstech
Website: controllerstech.com
