Board ID Info

The board ID info can be stored on the tm4c internal EEPROM. We are using Block 1 (0x40-0x80). The ID information is stored in the following format:

2 bytes	2 bytes	4 bytes	4 bytes	...
Serial #	Revision #	Firefly configuration	PS ignore mask	Other

Read access to the board ID information in the EEPROM can occur as bytes, words or half-words, but write access can only occur as words.

Firefly configuration is organized as one 4-byte word with each of the least significant 25 bits corresponding to a firefly, such that the i-th bit from the right is 1 if the i-th firefly is populated, and 0 if it is not:

N/A	...	N/A	V12 RX	...	K02 TX	K01 RX	K01 TX
0	...	0	0/1	...	0/1	0/1	0/1

PS ignore mask is the mask of power supplies to get ignored in the MCU on the startup sequence; these will not be enabled in the power-up or disabled in the power-down.

Block 1 is password-protected so that the ID information is not accidentally rewritten. To set the password protection on a new board, use the CLI command set_id_password, which automatically sets the password as 0x12345678. To write to this block, use the CLI command set_id <password> <addr> <data>. To view the ID information, use the CLI command id.

To set the firefly configuration register, type set_id 12345678 44 <mask>, where 12345678 is the password as mentioned in the previous paragraph, and 0x44 is the address for this configuration register.

To set the serial number, you need to do a read-modify-write since it is in a word with the rev number. TBA.

Board ID addresses

This is a summary of the register addresses in this part of the EEPROM.

Address	Content
0x40	ID
0x44	Firefly Mask
0x48	Power Supply Ignore Mask