Other Parts Discussed in Thread: TAS5806M, TAS3251
Hi everyone,
(Note: I finally found the solution myself while writing this post. Read my own answer if you're looking for a solution.)
I'm currently working with a TAS5806M EVM and I don't have a "PurePath Console Motherboard" attached. In fact I don't want one.
I have connected a Raspberry Pi model 3B to the I²S and I²C ports of my EVM (I²S: LRCLK, SCLK, SDIN1 ; I²C: SCL, SDA ; of course the GND is also connected to my RPi). The audio output format is I²S @ 48kHz, 32-bit, stereo. I know that the I²S bus works for sure because I manage to get sound out of a TAS3251 EVM with tha RPi as an audio source.
Problems arise when I want to configure my TAS5806M through I²C.
- No device answers at address 0x58 or 0x5A, I have an answer from 0x54 instead. As soon as the cable between the RPi and the EVM is removed, nothing is visible. Thus I assume that 0x54 corresponds to an address of some chip on the EVM, but which one?
- As soon as the RPi and EVM are connected together, the 3.3V LED lits up even without any external power source. I've verified my connections and I'm 100% I have no short. The DVDD voltage at U1 is approximately 2.75V whereas the J6 jumper is out (DVDD1 disconnected from DVDD). Is it some sort of back-powering from the I²C bus?
- Absolutely all read operation to 0x54 answers 0xff... I precise my I²C bus runs @ 400kHz (verified on a oscilloscope).
- I get two more devices when DVDD is up: 0x2C and 0x2D.
No DVDD supplied:
# sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- 54 -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --
DVDD On:
# sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- 2c 2d -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- 54 -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --
Can someone please give me a way of to configure my TAS5806M through I²C to at least get a sound at the output? I must say the datasheet is not really crystal clear about the configuration registers...
Thanks