USB Boot Loader (Device-Firmware-Upgrade) for STM32F103C8T6

USB Boot Loader (Device-Firmware-Upgrade) for                                                  STM32F103C8T6

STM32F103C8T6 is most popular cheap and best micro-controller based on ARM-Cortex-M3 core

It is also called as minimum development board or Bluepill it can be used to do mini projects.

from ST official website you can get datasheet and software for this board.Key features of this board 

it got multiple serial communication protocols like

1) USART   2) USB     3)SPI     4)I2C     5)CAN

also has 7-channel DMA support with moderate on chip memory of RAM-20KB, FLASH-64KB

by default it has USART bootloader.

To program it through USART ISP one should set two yellow jumpers in above diagram in following position

Boot0-High

Boot1-Low

For programming this device either you can use ST-Link or USB to TTL Serial Converter 

It also has Micro USB port but by default it can be used only to supply power to board. Here i will show how to add secondary bootloader to STM32F103C8T6 (bulepill) board so that you can use same USB cable to power up as well as to program board at the expense of loss of  few KB  flash. First 12KB of flash will be occupied by this secondary boot loader.

Softwares that are required to add DFU support to STM32F103C8T6 

1) STM FlashLoader- Download from STsite   

2) STM USBdfuse - Download from STsite

note you should register to download from ST which is simple process (free)

3) IDE i will use Keil uv , you can get it from here  select STM32F1xx pack

4) STM DFU Firmware.hex - Download

Initially Install first three softwares  after installation you may find STMicrocontroller

 softwares in this path C:\Program Files (x86)\STMicroelectronics\Software

just go to Flash Loader Demo folder and pin STMFlashLoaderDemo.exe to task bar

similarly go to DfuSe v3.05 folder -> Bin folder  and pin DfuFileMgr.exe and DfuSe Demo.exe to Taskbar. 

Then open  STM FlashLoader to flash controller with STM DFU Firmware.hex

Initially this has to be done through USART0 

pins PA9-Tx of board must be connected to Rx of USB to Serial Converter

pins PA10-Rx of board must be connected to Tx of USB to Serial Converter

and by keeping Boot0 high Boot1 low press reset 

open FlashLoader.exe

you should get this kind of info on screen

Press reset button on board  and click on next  

you should get response like this

If you get no response from device

Troubleshoot: then click on ok and change echo to echo mode press reset and click next again you will get no response. This time revert it to echo disabled and press reset on board and immediately click next you will get above mentioned response.

   then click next

It will recognize STM32F103C8T6 as medium density device click next

check Download to device and click on open  menu to select DFU.hex

click next.

you should get response as Download operation finished successfully then click on close.

now change boot0 position to logic 0 .

Go to C:\Program Files (x86)\STMicroelectronics\Software 

DfuSe v3.05 folder and click on drivers based on Processor type 64 or 32bit and Windows type go to appropriate Drivers folder and install drivers.

Since it is secondary bootloader entrypoint is based on PB9 pin when you connect USB to system make sure that PB9 kept floating If it is connected to ground DFU drivers will be skipped and application code will be executed.

open DFUse Demo you should see Internal flash of 64KB 

Since Secondary bootloader takes 12KB you have to follow few modifications in application code

System_stm32f10x.c change VECT_TAB_OFFSET to  0x3000

under options for target change IROM from 0x8000000 to 0x8003000 

also check Linker option use memory layout from target dialog

thats it click on to generate hex 

and open DFU file manager to convert Hex to DFU file

then click on generate .dfu file

save with some name and extension as .dfu it will give success message

then use Dfuse demo to upload code in to flash

check on Verify after download and Optimize Upgrade duration
you should get verify successful then click reset so that application code will be executed
 that's it you can do program by using same usb cable

  Programming Tutorial can be followed from here

NOTE: DFU.hex is password protected whoever wants it can post their email id under comments section. 

Indonesia -done

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I am glad that I could interact with people of these countries.Hopefully I could help somemore in future.