Information/HGAVR

From Buffalo NAS-Central

This article Based on work by Frontalot at Linkstationwiki.org
The AVR controls much of the LinkStation hardware, including the power button and LED indicator. It is controlled by the commands sent to /dev/ttyS1. To send commands to the AVR:

echo -n "commands" > /dev/ttyS1

Command	Action/Code
\30\30\30\30	Stops smbd and atalkd if /dev/hda3 is not mounted to /mnt. Sent by /www/script/melsub_diskcheck.sh.
[[[[	Starts slowly blinking power LED (sleep).
]]]]	High-speed cooling fan rotation.
\\\\	Low-speed cooling fan rotation.
>>>>	Unknown. Sent by ppc_uartd on boot.
AAAA	Unknown. Sent by ppc_uartd on boot.
CCCC	Sent by shutdown -r now (reboot).
EEEE	Sent by shutdown -h now (halt).
FFFF	Unknown. Sent by ppc_uartd on boot.
JJJJ	Unknown. Sent by ppc_uartd on boot.
KKKK	Unknown. Sent by ppc_uartd on boot.
QQQQ	Unknown. Sent by ppc_uartd on set timer.
RRRR	End of clear flash memory.
SSSS	Start of clear flash memory and /www/script/melsub_init.sh. Sent by /www/script/melsub_flash.sh.
TTTT	Flash memory update completed (stops blinking power, disk full, and diagnostic LEDs).
UUUU	Flash memory update started (starts blinking power, disk full, and diagnostic LEDs).
VVVV	Turns off disk full LED.
WWWW	Turns on disk full LED.
XXXX	Stops blinking disk full LED.
YYYY	Starts blinking disk full LED.
ZZZZ	Stops slowly blinking power LED. Sent by ppc_uartd.
gggg	Diagnostic LED blinks 3 times and system shutdown (partition error).
iiii	Diagnostic LED blinks 4 times and system shutdown (cooling fan error).
kkkk	Diagnostic LED blinks 5 times and system powers off (flash memory error).
mmmm	Diagnostic LED blinks 6 times and system shutdown (hard drive or ppc_uartd error).
oooo	Diagnostic LED blinks 7 times and system shutdown (RAM, NIC, or HDD controller error).

Most of this information courtesy of http://www.yamasita.jp/linkstation.en/index.html.

[edit] Pin assignment for the HGAVR

The AVR used in HG is actually a Freescale part of part number MC68HC908JL8CDW
The pin assignment and its functions used in HG is listed in the following table:

PIN	SIGNAL	Description	PIN	SIGNAL	Description
1	ZIRQ	CN3.3	28	ZRST	CN3.4
2	PTA0	DIAG LED	27	PTA5	Power switch input
3	VSS	CN3.6 / CN3.9	26	PTD4	Fan pulse input for status checking
4	OSC1	CN3.1	25	PTD5	HRST (CN5.13)
5	OSC2	-	24	PTD2	Control 12V feed to the main switching power via TR5, TR3
6	PTA1	Disk full LED	23	PTA4	Reset switch input
7	VDD	CN3.2	22	PTD3	Fan speed control via TR2,TR1
8	PTA2	Power LED green	21	PTB0	CN3.5
9	PTA3	Power LED yellow	20	PTB1	CN3.10
10	PTB7	NC	19	PTD1	IDE reset / TRST (CN5.4 via R66)
11	PTB6	NC	18	PTB2	CN3.7
12	PTB5	NC	17	PTB3	CN3.8
13	RXD	Connects to /dev/ttyS1	16	PTD0	Flash reset (ZRP on IC8.12)
14	TXD	Connects to /dev/ttyS1	15	PTB4	NC