Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Scheda Tecnica

102

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

If no valid code has been found in NVM during the NVM bootloader sequence, the SAM-BA Monitor program is launched.

The SAM-BA Monitor principle is to:



Initialize DBGU and USB



Check if USB Device enumeration has occurred



Check if characters have been received on the DBGU

Once the communication interface is identified, the application runs in an infinite loop waiting for different commands as
listed in 

Character(s) received

on DBGU ?

Run monitor

Wait for command 

on the USB link

Run monitor

Wait for command 

on the DBGU link

USB Enumeration 

Successful ?

Yes

Yes

No

No

Init DBGU and USB

No valid code in NVM