No I2C ACK from CS43L22

Hello,

I am trying to bring up the devices on the STM32F4 Discoveryboard. The
CS43L22 is still giving headaches. I query the I2C Bus by sending out address
2,4, ... 0xfe and if I get an ACK I declare the device available. I have
done this on several boards before. With the CS43L22 on the STM32F4
Discoveryboard even so I can verify the waveforms with an Logic
Analyser and all unrelated pins are set to safe level, there is no reaction
from the device.

Is there anything special I have to observe with the CS43L22?

Thanks

-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

On 20 Feb., 17:42, Uwe Bonnes <b...@elektron.ikp.physik.tu-
darmstadt.de> wrote:
> Hello,
>
> I am trying to bring up the devices on the STM32F4 Discoveryboard. The
> CS43L22 is still giving headaches. I query the I2C Bus by sending out address
> 2,4, ... 0xfe and if I get an ACK I declare the device available. I have
> done this on several boards before. With the CS43L22 on the STM32F4
> Discoveryboard even so I can verify the waveforms with an Logic
> Analyser and all unrelated pins are set to safe level, there is no reaction
> from the device.
>
> Is there anything special I have to observe with the CS43L22?
>

looked at this: stm32f4_discovery_audio_codec.c from
http://www.st.com/internet/com/SOFTWARE_RESOURCES/SW_COMPONENT/FIRMWARE/stm32f4discovery_fw.zip
?
-Lasse

langwadt@fonz.dk <langwadt@fonz.dk> wrote:
> On 20 Feb., 17:42, Uwe Bonnes <b...@elektron.ikp.physik.tu-
> darmstadt.de> wrote:
> > Hello,
> >
> > I am trying to bring up the devices on the STM32F4 Discoveryboard. The
> > CS43L22 is still giving headaches. I query the I2C Bus by sending out
> > address
> > 2,4, ... 0xfe and if I get an ACK I declare the device available. I have
> > done this on several boards before. With the CS43L22 on the STM32F4
> > Discoveryboard even so I can verify the waveforms with an Logic
> > Analyser and all unrelated pins are set to safe level, there is no 
> > reaction from the device.
> >
> > Is there anything special I have to observe with the CS43L22?
> >

> looked at this: stm32f4_discovery_audio_codec.c from
> http://www.st.com/internet/com/SOFTWARE_RESOURCES/SW_COMPONENT/\
> FIRMWARE/stm32f4discovery_fw.zip
> ?
I looked there to but could not decipher anything special...
-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

On 20.2.12 6:42 , Uwe Bonnes wrote:
> Hello,
>
> I am trying to bring up the devices on the STM32F4 Discoveryboard. The
> CS43L22 is still giving headaches. I query the I2C Bus by sending out address
> 2,4, ... 0xfe and if I get an ACK I declare the device available. I have
> done this on several boards before. With the CS43L22 on the STM32F4
> Discoveryboard even so I can verify the waveforms with an Logic
> Analyser and all unrelated pins are set to safe level, there is no reaction
> from the device.
>
> Is there anything special I have to observe with the CS43L22?
>

The I2C addressing is a bit confusing, as the device addresses
are doubled before sending out to the bus. The LS bit contains
the read/write request. The addresses for the chip may be 0x4a
or 0x4b, which are 0x94 to 0x97 (with r/w-) on the bus.

The maximum speed of the chip is specified at 100 kHz. Have you
checked that it is not exceeded? Does the chip respond with an
ACK?

For testing, the chip ID register may be a good candidate.

-- 

Tauno Voipio