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This is an old revision of the document!
This demo is targeted towards the Texas Instruments DK-TM4C123G development kit, with 256 kB internal Flash EEPROM and 32 kB internal RAM.
To program the bootloader into the internal flash on the TM4C123G microcontroller, the In-Circuit Debugger Interface (ICDI), that is available on the board, 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 TM4C123G'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 (tm4c123g.eww) is located at: \Target\Demo\ARMCM4_TM4C_DK_TM4C123G_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 TM4C123G. Using your favorite programmer (such as the LM Flash Programmer), flash the bootloader using one of the following files, depending on what file type your programmer supports:
The Microboot utility needs to be configured to connect to the correct COM-port and to communication at the correct baudrate:
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 (tm4c123g.eww) is located at: \Target\Demo\ARMCM4_TM4C_DK_TM4C123G_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
To download this demoprog_ek_lm3s6965.srec file to the remaining flash memory using the bootloader, start the Microboot program and click the “Browse”-button. Browse to the “\Target\Demo\ARMCM4_TM4C_DK_TM4C123G_IAR\Prog\bin\” directory and select the demoprog_dk_tm4c123g.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 status LED blinks periodically. Congratulations! That's all there is to using the bootloader.
In addition to the previously described update procedure with Microboot, the bootloader demo is configured for making firmware updates from an SD-card. The procedure is:
The bootloader demo is configured to output log messages to a serial terminal. This enables you to view the progress of the firmware update with a terminal program such as Putty. The communication settings are the same as those described above in section Configuring Microboot. Additionally, the log messages are written to a file called bootlog.txt on the SD-card, which can optionally be checked for verification purposes.