badra022 / OTA-Programmer

uart bootloader for STM32F103xx, used for over the air programming (flashing)

OTA-Programmer

IOT Website used to Upload Binary files, Tranmit it to the MCU using WIFI and Flash the Binary into MCU using simple UART Bootloader

How to use

note: No external libraries are used in This Project, So there's No dependencies except ArmGCC Toolchain downloaded in your computer, edit the path of the Toolchain in the makefile before build

• burn the bootloader hex file into your stm32f103xx Microcontroller
• when the Mcu is Up, it will connect to WIFI with your predefined username and password
  • just edit wifi_access.h file in Bootloader Code\includes directory with your username and password, then reBuild the project by typing make in your cmd window or your Terminal opened in /Bootloader Code/ directory
• Go to the website http://www.bfota.freevar.com/ and select some hex file for the same Microcontroller, then press Flash and your file will be uploaded to the server, your Microcontroller shall be notified with the file Now
  • Note that only txt format is accepted in the website so make sure to convert the type .hex to .txt for your hex file then upload it
  • The current version of the website must be uploading the name main.txt only, so ,make sure to rename your binary file to it
• wait approx. One Minute and Your Uploaded code will be Up and Running in the Microcontroller

About your Code

• head to the mem.ld or stm32_flash.ld in your Project and edit the following section

  /* Specify the memory areas */
MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 64K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 20K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

whatever the number in the LENGTH beside FLASH (rx), you need to decrease it by 8, and the ORIGIN need to be ORIGIN = 0x08002000 which is the start address of your Code in Flash memory

so it should be look like this

  /* Specify the memory areas */
MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08002000, LENGTH = 56K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 20K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

the reason is that the Bootloader is taking the first 8 pages of your Flash space i.e. 8 KB, so the Application shall be flashed in the Remaining space, taking only 56 KB of the 64 KB and starting from 0x08002000 instead of 0x0800000 , Leave the Rest of code as it is