[alsa-devel] recording problem in beagleboard-mcbsp

[Peter Ujfalusi]

On 04/13/2015 06:14 PM, Peter Ujfalusi wrote:
> On 04/10/2015 02:02 AM, noman pouigt wrote:
>>> Or to switch to use McBSP3.
>>
>> tried this as well but even playback didn't work.
>> +       mcbsp3_pins: pinmux_mcbsp3_pins {
>> +                pinctrl-single,pins = <
>> +                        OMAP3_CORE1_IOPAD(0x216C, PIN_OUTPUT | MUX_MODE1)
>> +                        OMAP3_CORE1_IOPAD(0x216E, PIN_INPUT | MUX_MODE1)
>> +                        OMAP3_CORE1_IOPAD(0x2170, PIN_OUTPUT | MUX_MODE1)
>> +                        OMAP3_CORE1_IOPAD(0x2172, PIN_OUTPUT | MUX_MODE0)
>> +                >;
>> +        };
> 
> Should be:
> mcbsp3_pins: pinmux_mcbsp3_pins {
> 	pinctrl-single,pins = <
> 		OMAP3_CORE1_IOPAD(0x2172, PIN_INPUT | MUX_MODE0) /* FSX */
> 		OMAP3_CORE1_IOPAD(0x2178, PIN_INPUT | MUX_MODE1) /* CLKX */
> 		OMAP3_CORE1_IOPAD(0x2174, PIN_OUTPUT | MUX_MODE1) /* DX */
> 		OMAP3_CORE1_IOPAD(0x2176, PIN_INPUT | MUX_MODE1) /* DR */
> 	>;
> };

> 
> Based on the schematics.
> 
> But for some reason I did not got capture working with this for the first try.
> Then my MicroSD card decided that it is now in Write Protected mode and can
> not recover it, no matter how I try (MicroSD does not have physical switch).
> 
> Have you tried to attach the codec to McBSP2? There is a P18 on the backside
> of the xM (near to the MicroSD slot, 4 pin square c onnector) with
> FSX/CLKX/DR/DX of McBSP2. You will need smaller pins to connect the line to
> this header
> 
> The strange thing is that McBSP2 and 3 are mostly identical (they only have
> different FIFO size) and McBSP3 is used in N9 to connect with twl5030 codec
> while the McBSP2 is used with tlv320dac33. I know they work(ed) since I wrote
> the audio support for the phone back in the days.
> 
> I need to find a spare MicrSD card now to boot the board, which I do not have ATM.
> 
> In any ways right now I have no idea why McBSP1 is not working as it should,
> it is odd never the less.


OK, got another SD card.
McBSP3 in master mode works (no codec connected) playback and capture as well.

The pins for McBSP3:
OMAP3_CORE1_IOPAD(0x2172, PIN_OUTPUT | MUX_MODE0) /* mcbsp3_fsx.mcbsp3_fsx */
OMAP3_CORE1_IOPAD(0x2178, PIN_OUTPUT | MUX_MODE1) /* uart2_tx.mcbsp3_clkx */
OMAP3_CORE1_IOPAD(0x2174, PIN_OUTPUT | MUX_MODE1) /* uart2_cts.mcbsp3_dx */
OMAP3_CORE1_IOPAD(0x2176, PIN_INPUT | MUX_MODE1)  /* uart2_rts.mcbsp3_dr */

I still not sure why McBSP1 is not working..

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