[sdiy] STM32 vs WM8731

[Rob Spencer]

Thanks Peter, I’ll try that.

Quick question, when you say 0 is a general call, will anything that’s listening on the bus respond?

Rob Spencer
gmsn.co.uk
07590 267835

From:  Ullrich Peter
Date:  Tuesday, 16 February 2016 08:44
To:  Rob Spencer, 'synth-diy'
Subject:  Re: [sdiy] STM32 vs WM8731

Hi Rob!

 

As a little I2C trouble shooter I normally make a little routine that’s called I2C_Scan that just makes a master transmit or receive to all addresses from 1 to 127 (0 is normally general call) and just checks if it receives an acknowledge or not followed by a stop condition that ends the communication without sending or receiving any data byte.

All addresses that get an acknowledge will be printed to the debugging console/serial interface and a summary tells how many addresses/devices have been found on the bus.

 

If you don’t get a response from your WM8731 then I would look for eventual hardware errors.

 

Ciao
Peter

 

Von: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Rob
Gesendet: Dienstag, 16. Februar 2016 09:37
An: 'synth-diy'
Betreff: [sdiy] STM32 vs WM8731

 

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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