[sdiy] STM32 vs WM8731

[Julian Schmidt]

Do oyu get an ACK if you send just the reset command before the actual 
initialisation?
writing 0x00 to register 0x0f? your i2c address with 0x34 seems aabout 
right.

On 16.02.2016 11:10, Julian Schmidt wrote:
> 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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>
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