imx6 can support pcm codec

[kingliu]

i.MX 6Dual/6Quad Applications Processor Reference Manual say the ssi of the imx6 only suport i2s ac97 mode opreation mode?

Anybody konow do the ssi suport pcm mode ?

[maheshk]

Hi all,

I am working on PROGRAMMABLE VOICE DAA SI3050,  It has SPI Interface for control as well as PCM highway data interface, which is to be interfaced with I.MX6UL. Can anybody tell  whether I.MX6UL has SSI interface ?. If this interface is possible, Please share the information on this.

Regards

Mahesh

[justin_jiang]

It is Synchronous Audio Interface (SAI) in i.MX6UL.

The synchronous audio interface (SAI) supports full-duplex serial interfaces with frame synchronization such as I2S, AC97, TDM, and codec/DSP interfaces

You can download i.MX6UL Reference Manual for more detail information.

It can be found in: i.MX 6UltraLite Applications Processor|NXP

[justin_jiang · Accepted solution]

Hi Liu King,

You can configure he SSI to network mode to support PCM data.

B.R

Jusin

[shichinhuang]

Hi Qingrong,

Our implement is using audio PCM format via I2S interface connect to Bluetooth to support audio function.

Does i.MX6Solo can support it? (Please also see the attachment)

Thanks!

[justin_jiang]

Yes, i.MX 6Solo can support  I2S interface.

[shichinhuang]

Hi Qingrong,

So you mean i.MX6Solo can set audio format to PCM format and  stream it with Bluetooth via I2S interface?

Thank you for your support!

[guslabao]

Hi Shichin,

Did you get the IMX6Solo AUD3 interface to connect to BT PCM interface to work?

Thanks,

Gus

[sumit8915]

Hi Justin,

We have a custom Designed Board based on i.mx6D, Where the SLIC IC, LE9641 (Supporting PCM +SPI) is connected to the AUDMUX interface and the SPI interface of the i.mx6D respectively.

We are able to communicate with the SLIC IC trough SPI interface, but i m not getting CLOCK from the AUDMUX fro the PCM interface.

Could you please suggest anything on this?

Thanks

Sumit

[saurabh206]

Hi

Sumit

You need to configure SSI in master mode than only you will get clock from AUDMUX interface.

[sumit8915]

Hi Saurabh,

It is configured in Mater mode only. But still no clock comes on AUD5_TXC Pin :smileyplain:.

Thanks

Sumit

[saurabh206]

Hi

Sumit

Can you shared the information for where the code modification done?

[sumit8915]

Hi Saurabh patel,

Here are my code changes.

&audmux {

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_audmux_3>;

        status = "okay";

};

pinctrl_audmux_3: audmux-3 {

    fsl,pins = <

        MX6QDL_PAD_KEY_ROW1__AUD5_RXD   0x130b0

        MX6QDL_PAD_KEY_COL0__AUD5_TXC   0x130b0

        MX6QDL_PAD_KEY_ROW0__AUD5_TXD   0x110b0

        MX6QDL_PAD_KEY_COL1__AUD5_TXFS  0x130b0

                        >;

                };

&ssi1 {

        fsl,mode = "i2s-master";

        status = "okay";

};

mux-int-port = 5   mux-ext-port = 2 and we are setting dai format as SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |SND_SOC_DAIFMT_CBS_CFS

and audmux configurations as

ret = imx_audmux_v2_configure_port(int_port,

                       IMX_AUDMUX_V2_PTCR_SYN |

                       IMX_AUDMUX_V2_PTCR_TFSEL(ext_port) |

                       IMX_AUDMUX_V2_PTCR_TCSEL(ext_port) |

                       IMX_AUDMUX_V2_PTCR_TFSDIR |

                       IMX_AUDMUX_V2_PTCR_TCLKDIR,

                       IMX_AUDMUX_V2_PDCR_RXDSEL(ext_port));

ret = imx_audmux_v2_configure_port(ext_port,

                       IMX_AUDMUX_V2_PTCR_SYN,

                       IMX_AUDMUX_V2_PDCR_RXDSEL(int_port));

[saurabh206]

Hi Sumit

Have you set "snd_soc_dai_set_sysclk" clock direction out.

It will solve your issue.

[sumit8915]

Hi Saurabh Patel,

Our clock direction is OUT only.Here is our function call.

ret = snd_soc_dai_set_sysclk(cpu_dai, 0,

                        pll_out, SND_SOC_CLOCK_OUT);

[sumit8915]

Hi Saurabh,

After using the SSI2 controller instead of SSI1, We are able to get the PCM Clock of 2.048Mhz and Frame Sync of 32Khz, But  the SLIC IC supports PCM Clock rates of 1.024MHz, 1.536MHz, 2.048MHz. 3.073MHz, 4.096Mhz, 6.144MHz and 8.192Mhz with a Frame SYNC of 8KHz.

We have changed the "SSIx_SRCCR" register corresponding to SSI2 controller of i.MX6 processor with values of "0x00007F03" to make frame sync freq of 8Khz, But still no change, But we did not see any change in the Frame sync clock ,

Here in the below table we have used with marked configuration. 

Do you have any idea, how we can get the frame Sync of 8Khz.

Thanks

Sumit

[sumit8915]

Hi,

Can Anybody reply on my last question posted.

Thanks

Sumit

[kingliu]

Hi Qingrong

There are two modes mode A and mode B of pcm mode.

Which mode does the network mode of ssi support?

[justin_jiang]

Hi

You can config the TSCKP and RSCKP to support both mode A&B.

TSCKP

Transmit Clock Polarity. This bit controls which bit clock edge is used to clock out data for the transmit

section. Note: TSCKP is 0 CLK_IST = 0; TSCKP is 1CLK_IST = 1

0 Data clocked out on rising edge of bit clock.

1 Data clocked out on falling edge of bit clock.

RSCKP

Receive Clock Polarity. This bit controls which bit clock edge is used to latch in data for the receive

section.

0 Data latched on falling edge of bit clock.

1 Data latched on rising edge of bit clock.

[nagendrasarma]

hi Freescale,

can you please provide the steps to enable Network mode (PCM) to capture 6 channel audio ?

in dtsi file can i  change the CPU_DAI configuration as below ?

&ssi2 {

        fsl,mode = "pcm-slave";

        status = "okay";

};

regards

Nagendra