This demo is targeted towards the Olimex EM-32G880F128-STK board, with 128 kB internal Flash EEPROM and 16 kB internal RAM.

To program the bootloader into the internal flash on the EFM32G880 microcontroller, the Segger J-Link JTAG interface was used. However, this is not required if you have another means of programming the internal flash.

To compile the demo programs you can use the IAR Embedded Workbench for ARM development environment.

Before the bootloader can be used, it needs to be built and programmed into the EFM32G880's internal flash memory. The steps in this section only need to be done once.

When using IAR EWARM, simply open the workspace from within the Embedded Workbench. The workspace file (efm32G880.eww) is located at: \Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Boot\ide\. Once opened, select Project→Rebuild All from the menu to compile all the bootloader sources and link the together into the final executable.

The bootloader program is now ready to be programmed into the internal flash memory of the EFM32G880. Using your favorite programmer, flash the bootloader using one of the following files, depending on what file type your programmer supports:

• \Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Boot\bin\openbtl_olimex_efm32g880.out
• \Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Boot\bin\openbtl_olimex_efm32g880.srec

The Microboot utility needs to be configured to connect to the correct COM-port and to communication at the correct baudrate:

• Start Microboot by double-clicking “\Host\MicroBoot.exe”.
• Click the “Settings”-button and select “OpenBLT using UART” from the dropdown box.
• Click the “Options”-button to configure the communication parameters.
  • Select the PC's COM-port that the board is connected to.
  • Set the baudrate to 9600 bits/sec.

Once you saved the settings by clicking the “OK”-button twice, you can close Microboot by clicking the “Cancel”-button on the main screen. Microboot is now ready for action!

When using IAR EWARM, simply open the workspace from within the Embedded Workbench. The workspace file (lm3s6965.eww) is located at: \Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Prog\ide\. Once opened, select Project→Rebuild All from the menu to compile all the demo program sources and link the together into the final executable.

The output file is

• \Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Prog\bin\demoprog_olimex_efm32g880.srec

To download this demoprog_olimex_efm32g880.srec file to the remaining flash memory using the bootloader, start the Microboot program and click the “Browse”-button. Browse to the “\Target\Demo\ARMCM3_EFM32_Olimex_EM32G880F128STK_IAR\Prog\bin\” directory and select the demoprog_olimex_efm32g880.srec file to start the download.

Once the download completed, the newly programmed software will be started by the bootloader. You can verify this by checking that the test “Olimex” blinks on the LCD. Congratulations! That's all there is to using the bootloader.