![]() ![]() It is a step by step guide which will help you to install STM32 Bootloader and then program your Blue Pill through the micro USB port using Arduino IDE. You can also read the below tutorials.In this tutorial, we will learn how to program STM32 Blue Pill through USB port by uploading Bootloader to the board. If you are planning to develop the STM32 bootloader using MikroC Pro for ARM, please check these tutorials. We request you to check variant 1 using STM32F103 and variant 2 using STM32F7 microcontroller. We have posted two variants of the bootloader. If it is valid, then only we give control to the firmware or application. When you have the product which has to be secured, then what will you do when someone overwrites the application or firmware with their customized firmware to hack your product? How do you find it? In this case, we can use the bootloader to check whether the firmware is valid or not. You can update the firmware or application without connecting any debugger or flasher. But when you are planning to sell your products to the customers, what will do if you want to update the application/firmware in the device that you sold already? Every time go to the field and connect the JTAG/J-LINK and flash the firmware or application? It is not possible, right? So, If you have your bootloader, then you don’t need to worry about that. We are not complicating by writing an extra bootloader. I agree that when you don’t have a bootloader, it is very simple. Is it really useful? Why do we need this? Still, I am using a project which doesn’t have a bootloader. What is the need for Bootloader in Microcontroller? Firmware update ![]() Now, the application does its job based on our product or project. Once it is done with the operations, the bootloader job is done. If you have a bootloader, then before the application, this bootloader starts running and does some process. We have already discussed, what happens when we press the reset button if the bootloader is not present in STM32 (Cortex M4). If you don’t have a bootloader, then directly an application will start running. ![]() This is the first piece of code that runs when you press the reset button if you have a bootloader. Like a normal OS, the bootloader in a microcontroller also serves the same purpose. What is a Bootloader in Embedded systems? All OS has the bootloader which will run initially. You can take any OS including Mac, or Linux. Then OS will take care of the system running. Once it has done its work, then it will give control to the OS. It will do some operations based on the need. Have you noticed some text comes before the windows logo comes when you turn on the system? At the time of booting, if you press the Shift key or F12 key, then you may see one blue color screen with some options. If you have used Windows operating system, then that is fair enough. To understand the operations of the bootloader, you don’t need to be an expert in embedded systems. The term bootloader is a shortened form of the words “ bootstrap loader”. So, you must be clear that this is also software like an application. It is special operating system software that loads into the working memory of a computer after start-up. A bootloader, also known as a boot program or bootstrap loader. The bootloader is a very important component in any operating system.
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