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An example to demonstrate the use of a flash-based boot loader. At startup,
the application will configure the UART peripheral, wait for SW1 to be
pressed and blink LED D2. When the SW1 is pressed, LED D2 is turned off,
and then the application branches to the boot loader to await the start of
an update. The UART will always be configured at 115,200 baud and does not
require the use of auto-bauding.
This application is intended for use with the boot_serial flash-based boot
loader included in the software release. Since the sector size is 16KB, the
link address is set to 0x4000. If you are using USB or Ethernet boot
loader, you may change this address to a 16KB boundary higher than the last
address occupied by the boot loader binary as long as you also rebuild the
boot loader itself after modifying its bl_config.h file to set
APP_START_ADDRESS to the same value.
The boot_demo1 application can be used along with this application to
easily demonstrate that the boot loader is actually updating the on-chip
flash.
Note that the TM4C129x-class device also support serial, Ethernet and USB
boot loaders in ROM. To make use of this function, link your application
to run at address 0x0000 in flash and enter the bootloader using either the
ROM_UpdateSerial, ROM_UpdateEMAC or ROM_UpdateUSB functions (defined in
rom.h). This mechanism is used in the utils/swupdate.c module when built
specifically targeting a suitable TM4C129x-class device.
