topic Re: How to get SPH0645LM4H working with imx6ul in i.MX Processors

How to get SPH0645LM4H working with imx6ul

ankurgohel — Thu, 15 Sep 2016 15:04:32 GMT

We are developing an IoT based product using NXP imx6ul processor. We have used the SPH0645LM4H microphone. The microphone is connected to the processor on the I2S bus. The processor runs on Linux 3.14.52. As of now we are working on board bring up of the processor but we are not able to find any Linux driver for the mic in the kernel source code (3.14.52). We are trying to capture raw audio from the mic in Linux user-space. All of the peripherals are up and running and we are kind of stuck with the mic. We need to get this phase of the project done Monday, 19th September at all costs. Hence we really need someone to provide us guidance. Can someone from your team help us out here?

Thanks in advance for any help that you can provide!

Re: How to get SPH0645LM4H working with imx6ul

igorpadykov — Thu, 15 Sep 2016 23:36:42 GMT

Hi Ankur

I am not aware of SPH0645LM4H linux driver, but if microphone

is connected to codec, one can reuse for example wm8960 or sgtl5000 driver and

add microphone init codes to i2c section of codec driver.

Best regards
igor
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Re: How to get SPH0645LM4H working with imx6ul

ankurgohel — Fri, 16 Sep 2016 06:24:46 GMT

Hi Igor,

Thanks!

The microphone is a digital microphone and outputs i2s data directly (http://www.knowles.com/kor/content/download/5988/105771/version/4/file/SPH0645LM4H-BRevB.PDF ). The I2S output lines of MIC are connected directly to the SAI interface channel 2. If you would see the datasheet it says that no codec is needed. Hence, in our design we have not used any codecs. Can you get someone to provide us a direction about how this can be achieved?

Re: How to get SPH0645LM4H working with imx6ul

igorpadykov — Fri, 16 Sep 2016 10:46:00 GMT

Hi Ankur

one can reuse existing wm8960 driver, removing specific wm8960

settings.

Best regards
igor

Re: How to get SPH0645LM4H working with imx6ul

ankurgohel — Fri, 16 Sep 2016 13:38:21 GMT

We checked the source code for the driver located at "sound/soc/fsl/imx-wm8960.c". It seems the codec is based on I2C. We are looking for something based on I2S (Inter-IC Sound). Can you please suggest?

Re: How to get SPH0645LM4H working with imx6ul

igorpadykov — Sat, 17 Sep 2016 00:39:57 GMT

both sai and wm8960.c support I2S.

I2C is used for control.

Re: How to get SPH0645LM4H working with imx6ul

niranjan_rao — Tue, 18 Oct 2016 11:31:45 GMT

Hi Ankur,

Did you get SPH0645LM4H to work, if so can you share it here?

thank you

Re: How to get SPH0645LM4H working with imx6ul

hitesh_kasera — Fri, 22 Mar 2019 10:35:39 GMT

Hi,

is there anyone who has done the same (SPH0645LM4H working with imx6ul). or if anyone can guide for the same It will be really helpful.

Thanks,

Hitesh

Re: How to get SPH0645LM4H working with imx6ul

hitesh_kasera — Mon, 25 Mar 2019 12:23:23 GMT

Hi Niranjan,

Have you figured out a way to implement SPH0645LM4H with connect core 6 ul, If so please share the same. It will be really helpful.

Thanks,

Hitesh