Datasheet

63
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
11.5 SAM-BA Monitor
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 Table 11-4.
Figure 11-10.SAM-BA Monitor Diagram
11.5.1 Command List
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 ?
Ye s Ye s
No
No
Init DBGU and USB
No valid code in NVM
Table 11-4. Commands Available through the SAM-BA Monitor
Command Action Argument(s) Example
N set Normal mode No argument N#
T set Terminal mode No argument T#
O write a byte Address, Value# O200001,CA#
o read a byte Address,# o200001,#
H write a half word Address, Value# H200002,CAFE#
h read a half word Address,# h200002,#
W write a word Address, Value# W200000,CAFEDECA#
w read a word Address,# w200000,#
S send a file Address,# S200000,#
R receive a file Address, NbOfBytes# R200000,1234#
G go Address# G200200#
V display version No argument V#