<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><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 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 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></div></body></html>