1.3.5 SAMA7G5 Evaluation Kit: Building and Running the UART Bootloader With SD/eMMC Media Applications

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repo or download as zip file. This content can also be download using content manager by following these instructions.

Path of the application within the repository is apps/mpu_uart_bootloader/.

To build the application, refer to the following table and open the project using its IDE.

• Connect the USB port J7 on board to the computer using a micro USB cable (to power the board)
• Connect the USB port J24 on board to the computer using a micro USB cable (to enable debug com port)
• SD card with FAT32 file system

• Refer to the Bootloader Host Script Help for setting up the btl_host.py utility used to send the application binary from host PC

1. Open the test application project test_app/firmware/sam_a7g5_ek.X in the IDE.

2. Build the project to generate the harmony.bin binary (Do not program the binary).

3. Open the bootloader project bootloader_sd_emmc/firmware/sam_a7g5_ek.X in the IDE.

4. Build the project to generate the harmony_bootloader.bin binary (Do not program the binary).

5. Copy the MPU bootstrap loader binary (boot.bin) from <harmony3_path>/bootloader_apps_uart/deps/at91bootstrap_binaries_sam_a7g5_ek/sd_card/boot.bin onto the SD card.

6. Copy the harmony bootloader binary (harmony_bootloader.bin) from <harmony3_path>/bootloader_apps_uart/apps/mpu_uart_bootloader/bootloader_sd_emmc/firmware/sam_a7g5_ek.X/dist/sam_a7g5_ek/production/harmony_bootloader.bin onto the SD card.

7. Insert the SD card into SD CARD connector J4 on the board.

8. Reset or Power cycle the device. Green LED will be turned-on to indicate that harmony bootloader code is running on the target.

9. Run the btl_host.py from command prompt to program the application binary.

    python <harmony3_path>/bootloader/tools/btl_host.py -v -i <COM PORT> -d sama7 -f <harmony3_path>/bootloader_apps_uart/apps/mpu_uart_bootloader/test_app/firmware/sam_a7g5_ek.X/dist/sam_a7g5_ek/production/harmony.bin
   

10. Following figure shows output of successfully programming the test application.

    • Rebooting and Reboot Done messages in below output signifies that bootloading is successful

    

11. If above step is successful then the Green LED should start blinking.

12. Open the Terminal application (e.g., Tera Term) on the computer.

13. Configure the serial port settings as follows:

    • Baud: 115200
    • Data: 8 Bits
    • Parity: None
    • Stop: 1 Bit
    • Flow Control: None

14. Reset or Power cycle the device.

15. Green LED should start blinking and the user should see below output on the console.

    

16. Press and hold the Switch SW1 and then press Reset button or Power cycle the device to force trigger bootloader at startup.

17. Repeat Steps 9-15 once.

    • This step is to verify whether bootloader is triggered by switch press at reset

• To bootload any other application, refer to the Configuring an Application to Be Bootloaded for MPUs