[sdiy] STM32 vs WM8731

[Julian Schmidt]

you select the address via the CSB and MODE pin.
In your case both are tied to GND which should give the address 0x1A I 
think.

julian

On 16.02.2016 09:37, Rob wrote:
>
> Just continuing on the STM32 discussions…
>
> I’ve been trying to get a Nucleo-F411RE talking to a WM8731, but not 
> having much luck getting it to communicate over I2C
>
> I send the following from the STM32:
>
>                 WM8731Status[0] = HAL_I2C_Master_Transmit(&hi2c1, 
> 0x34, WM8731PowerOn1, 1, 10000);
>
> But I don’t get an Ack from the WM8731:
>
> https://www.dropbox.com/s/yhen98n17pyrqgr/Screenshot%202016-02-16%2008.22.15.png?dl=0
>
> Here’s the schematic for the WM8731 setup:
>
> https://www.dropbox.com/s/e6fkerkmf95ldzf/Screenshot%202016-02-16%2008.20.29.png?dl=0
>
> I’m pretty sure everything on the STM32 side is setup correctly, and 
> I’m working on the assumption that there’s not a lot to do with the 
> WM8731. Once all the power is connected and the I2C mode and address 
> pins are set low it should just receive I2C messages. I think the 
> issue might be around the address, but I’ve tried all combinations I 
> can think of.
>
> Any help would be much appreciated as my wife is getting tired of me 
> shouting at the darn thing!
>
> Many thanks in advance
>
> Rob
>
> gmsn.co.uk
>
>
>
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