OpenBLT Bootloader

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====== ARM-CM4 STM32 Nucleo-L476RG IAR EWARM ======

===== Supported firmware update interfaces =====

^ RS232         ^ CAN            ^ USB         ^ TCP/IP      ^ SD-card      ^ Modbus RTU   ^
| Yes           | Yes            | No          | No          | No           | No           |

===== Development Environment =====

{{:manual:demos:stm32_nucleo_l476rg.png? |}}

This demo is targeted towards the [[http://www.st.com/en/evaluation-tools/nucleo-l476rg.html|Nucleo-L476RG]] board, with 1 MB internal Flash EEPROM and 128 kB internal RAM.

To compile the demo programs you can use the [[http://www.iar.com/|IAR Embedded Workbench for ARM]] development environment. 

To program the bootloader into the internal flash, the on-board ST-Link debugger interface was used. Firmware updates via the serial communication port are preconfigured to use the virtual COM-port offered by the ST-Link. This means that no additional hardware is needed, besides a standard micro-USB cable.

===== Building and programming the Bootloader =====

Before the bootloader can be used, it needs to be built and programmed into the STM32L476'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 (stm32l476.eww) is located at: \Target\Demo\ARMCM4_STM32L4_Nucleo_L476RG_IAR\**Boot**\ide\. Once opened, select //Project->Rebuild All// from the menu to compile all the bootloader sources and link them together into the final executable.

The bootloader program is now ready to be programmed into the internal flash memory of the STM32L476. Select //Project -> Download and Debug (Ctrl+D)// from the menu to flash the bootloader program. Once done, you can start the bootloader program by selecting //Debug -> Go (F5)// from the menu.

Alternatively, you can use your favorite programmer to flash the bootloader using one of the following files, depending on what file type your programmer supports:

  * \Target\Demo\ARMCM4_STM32L4_Nucleo_L476RG_IAR\**Boot**\bin\**openblt_stm32l476.out**
  * \Target\Demo\ARMCM4_STM32L4_Nucleo_L476RG_IAR\**Boot**\bin\**openblt_stm32l476.srec**


===== Building the Demo Program =====

When using IAR EWARM, simply open the workspace from within the Embedded Workbench. The workspace file (stm32l476.eww) is located at: \Target\Demo\ARMCM4_STM32L4_Nucleo_L476RG_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\ARMCM4_STM32L4_Nucleo_L476RG_IAR\**Prog**\bin\**demoprog_stm32l476.srec**


===== Firmware update procedure =====

To download the demo program \Target\Demo\ARMCM4_STM32L4_Nucleo_L476RG_IAR\**Prog**\bin\**demoprog_stm32l476.srec** using the bootloader, follow the instructions in the following links, depending on the communication interface you intend to use:

  * [[manual:rs232_demo|Firmware updates using the RS232 communication interface]]
  * [[manual:can_demo|Firmware updates using the CAN communication interface]]
OpenBLT Bootloader

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