[linux-dvb] Re: Skystar2 i2c lockup

[Niklas Peinecke]

Augusto Cardoso wrote:
Hi!

Here are the registers for the "two line serial":

Reg 0x100
WRITE
Bits 6-0	CHIPADDRESS
Bit 7	Reserved
Bits 15-8 BASE ADDRESS
Bits 23-16 DATA1
Bit 24	Start transaction. 
Bit 25	R/#W Read=1, Write=0
Bit 27-26 Size of transaction. 00=1, 11=4 bytes.
Bit 29-28 Port selection 00=Invalid, 01=Frontend, 10-EEPROM, 11=Tuner
Bit 30	Base address presence indicator. When 1, no base address is generated.
Bit 31	Reserved

Reg 0x100
READ
Bit 0   R/#W - Internal states.
Bits 7-1        CHIPADDRESS
Bits 15-8 BASE ADDRESS
Bits 23-16 DATA1
Bit 24  Status. When=1, transaction underway. =0  engine is free.
Bit 25  R/#W Read=1, Write=0
Bit 27-26 Size of transaction. 00=1, 11=4 bytes.
Bit 29-28 Port selection 00=Invalid, 01=Frontend, 10-EEPROM, 11=Tuner
Bit 30  ACK error. When =1, no ACK from slave.
Bit 31  When set, it indicate that the current transaction is done.
Reg 0x104
Bit 7-0 Data2
Bit 15-8        Data3
Bit 23-16 Data4
Bit 24  Explicit STOP. When set, the transaction is done without a trailing STOP. FC3 
only.
Bit 25  When set, generates a STOP event. FC3 only.
Bit 31-26 Reserved.
Reg 0x108, 0x10c and 0x110 Have the same function, but affecting ports 1(Frontend), 
2(EEPROM) and 3(Tuner), respectively.
Bits 5-0        thi Time High for i2c timing. The reference is a pre-scale internal 
clock based on the main clock.
Bits 12-8 tlo Time Low for i2c timing. The reference is a pre-scale internal clock 
based on the main clock.
All other bits, reserved.
I hope this is not too confusing.
Let me know if you have any questions.
	Augusto

Ok, here I go:

> Reg 0x100
> WRITE
...
> Bits 15-8 BASE ADDRESS
...
> Bit 30	Base address presence indicator. When 1, no base address is 
generated.

Does this mean when Bit 30 is set, the base address specified in 15-8 is 
not sent via i2c but only the DATA1, DATA2, and DATA3? Suppose I only 
want to send DATA1. Should I set size of transaction to 00 or 01 then? I 
suppose 00. Thus, there is no way to send 0 byte transactions ("i2c 
pings"), right? Also there is no way to do a read only from the bus, 
without writing the base address first (or is that the purpose of Bit 30)?

I hope, I do not ask for too much.

Thanks,

Niklas



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