Flash applications and data

Flash an application

Flashing an application allows it to run without external intervention.

In order to flash an application you need to follow this procedure:

• Clean the project using make clean;

• Compile and flash using make all CONFIG_BOOT_DEVICE=<boot_device> io=uart

  • CONFIG_BOOT_DEVICE=<boot_device> selects the flashing location. Option values are described in the Application Makefile options guide;

  • io=uart tells printf outputs to use UART instead of JTAG to avoid getting stuck doing semihost calls;

• Select the correct boot mode, either via boot pads or via efuses;

• Reboot.

Flash data

Flash data using filesystems

Using ReadFS

ReadFS is a small read-only filesystem. To flash some files/directories simply add in the application Makefile:

• a READFS_FILES variable pointing to the files you want to include;

• a READFS_DIRS variable pointing to the directories you want to include recursively;

• a READFS_DIRS_NO_REC variable pointing to the directories you want to include non-recursively.

The image will be generated and flashed automatically when executing the make all command.