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you select the address via the CSB and MODE pin.<br>
In your case both are tied to GND which should give the address 0x1A
I think.<br>
<br>
julian<br>
<br>
<div class="moz-cite-prefix">On 16.02.2016 09:37, Rob wrote:<br>
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<p class="MsoNormal">Just continuing on the STM32 discussions…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve been trying to get a Nucleo-F411RE
talking to a WM8731, but not having much luck getting it to
communicate over I2C<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I send the following from the STM32:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> WM8731Status[0] =
HAL_I2C_Master_Transmit(&hi2c1, 0x34, WM8731PowerOn1, 1,
10000);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But I don’t get an Ack from the WM8731:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <a moz-do-not-send="true"
href="https://www.dropbox.com/s/yhen98n17pyrqgr/Screenshot%202016-02-16%2008.22.15.png?dl=0">https://www.dropbox.com/s/yhen98n17pyrqgr/Screenshot%202016-02-16%2008.22.15.png?dl=0</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here’s the schematic for the WM8731 setup:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <a moz-do-not-send="true"
href="https://www.dropbox.com/s/e6fkerkmf95ldzf/Screenshot%202016-02-16%2008.20.29.png?dl=0">https://www.dropbox.com/s/e6fkerkmf95ldzf/Screenshot%202016-02-16%2008.20.29.png?dl=0</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help would be much appreciated as my
wife is getting tired of me shouting at the darn thing!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks in advance<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rob<o:p></o:p></p>
<p class="MsoNormal">gmsn.co.uk<o:p></o:p></p>
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