AT91SAM9G20 datasheet(82/832 Pages) ATMEL

82 / 832 page

6384D–ATARM–04-May-09

AT91SAM9G20 Preliminary

13.10 SAM-BA Boot

If no valid DataFlash device has been found during the DataFlash boot sequence, the SAM-BA

boot program is performed.

The SAM-BA boot principle is to:

– Wait for USB Device enumeration.

– In parallel, wait for character(s) received on the DBGU.

– Once the communication interface is identified, the application runs in an infinite

loop waiting for different commands as in Table 13-5.

• Write commands: Write a byte (O), a halfword (H) or a word (W) to the target.

– Address: Address in hexadecimal.

– Value: Byte, halfword or word to write in hexadecimal.

– Output: ‘>’.

• Read commands: Read a byte (o), a halfword (h) or a word (w) from the target.

– Address: Address in hexadecimal

– Output: The byte, halfword or word read in hexadecimal following by ‘>’

• Send a file (S): Send a file to a specified address

– Address: Address in hexadecimal

– Output: ‘>’.

Note:

There is a time-out on this command which is reached when the prompt ‘>’ appears before the

end of the command execution.

• Receive a file (R): Receive data into a file from a specified address

– Address: Address in hexadecimal

– NbOfBytes: Number of bytes in hexadecimal to receive

– Output: ‘>’

•Go (G): Jump to a specified address and execute the code

– Address: Address to jump in hexadecimal

– Output: ‘>’

• Get Version (V): Return the SAM-BA boot version

– Output: ‘>’

Table 13-5.

Commands Available through the SAM-BA Boot

Command

Action

Argument(s)

Example

write a byte

Address, Value#

O200001,CA#

read a byte

Address,#

o200001,#

write a half word

Address, Value#

H200002,CAFE#

read a half word

Address,#

h200002,#

write a word

Address, Value#

W200000,CAFEDECA#

read a word

Address,#

w200000,#

send a file

Address,#

S200000,#

receive a file

Address, NbOfBytes#

R200000,1234#

Address#

G200200#

display version

No argument

AT91SAM9G20 Datasheet(PDF) 82 Page - ATMEL Corporation

AT91SAM9G20 Datasheet(HTML) 82 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL