Audio by MCASP0 on BeagleBone

Mehmet Kurnaz15096

Hello all,

I need some help about audio on beaglebone. I have done some changes on kernel but I couldn't hear anything. But with same changes on linux sdk, there is no problem, I can hear audio.

We use tlv320aic3x codec with beaglebone-dvi-d card. We used I2C1 and there is no problem on communication with codec. In spite of communication, codec doesn't run properly. There is no bit clock and frame sync. clock on codec.

I can see below debugs while linux booting;

[    1.379332] asoc: tlv320aic3x-hifi <-> davinci-mcasp.0 mapping ok            
[    1.386528] ALSA device list:                                                
[    1.389665]   #0: AM335X EVM

And We used MCASP0 like below pinmuxs

/* Module pin mux for mcasp0 */
static struct pinmux_config mcasp0_pin_mux[] = {
	{"mcasp0_aclkx.mcasp0_aclkx", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_fsx.mcasp0_fsx", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_ahclkr.mcasp0_axr2", OMAP_MUX_MODE2 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_ahclkx.mcasp0_axr3", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
	{NULL, 0},
};

over 12 years ago

0 Vishveshwar Bhat over 12 years ago

TI__Genius 10210 points

Could you attach the full changes in patch format for us to analyze.

Please note that we use a separate defconfig file for android on beaglebone. It may not be possible to use the kernel generated with the am335x_evm defconfig.

0 Mehmet Kurnaz15096 over 12 years ago in reply to Vishveshwar Bhat

Intellectual 560 points

Sorry for delay in the response. I was on vacation and returned today morning.

I didn't use am335x_evm_defconfig, I used am335x_evm_android_defconfig. I did below changes. Sorry it is not in patch format.

arch/arm/mach-omap2/board-am335xevm.c

static u8 am335x_iis_serializer_direction0[] = {
        INACTIVE_MODE, INACTIVE_MODE, TX_MODE,        RX_MODE,
        INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE,
        INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE,
        INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE, INACTIVE_MODE,
};

static struct snd_platform_data am335x_evm_snd_data0 = {
        .tx_dma_offset = 0x46000000,   /* McASP0 */
        .rx_dma_offset = 0x46000000,
        .op_mode        = DAVINCI_MCASP_IIS_MODE,
        .num_serializer = ARRAY_SIZE(am335x_iis_serializer_direction0),
        .tdm_slots      = 2,
        .serial_dir     = am335x_iis_serializer_direction0,
        .asp_chan_q     = EVENTQ_2,
        .version        = MCASP_VERSION_3,
        .txnumevt       = 1,
        .rxnumevt       = 1,
};

/* Module pin mux for mcasp0 */
static struct pinmux_config mcasp0_pin_mux[] = {
	{"mcasp0_aclkx.mcasp0_aclkx", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_fsx.mcasp0_fsx", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_ahclkr.mcasp0_axr2", OMAP_MUX_MODE2 | AM33XX_PIN_INPUT_PULLDOWN},
	{"mcasp0_ahclkx.mcasp0_axr3", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
	{NULL, 0},
};

/* Setup McASP 0 */

static void mcasp0_init(int evm_id, int profile)
{
        /* Configure McASP */
        setup_pin_mux(mcasp0_pin_mux);
        am335x_register_mcasp0(&am335x_evm_snd_data0);
        return;
}

/* Beaglebone Rev A3 and after */
static struct evm_dev_cfg beaglebone_dev_cfg[] = {
	{lcdc_init, 	DEV_ON_BASEBOARD, PROFILE_NONE},
	{tsc_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{mii1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{usb0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{usb1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{mmc0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{i2c1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{mcasp0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
	{NULL, 0, 0},
};

arch/arm/mach-omap2/devices.c


static struct resource am335x_mcasp0_resource[] = {
        {
                .name = "mcasp0",
                .start = AM33XX_ASP0_BASE,
                .end = AM33XX_ASP0_BASE + (SZ_1K * 12) - 1,
                .flags = IORESOURCE_MEM,
        },
        /* TX event */  
        {
                .start = AM33XX_DMA_MCASP0_X,
                .end = AM33XX_DMA_MCASP0_X,
                .flags = IORESOURCE_DMA,
        },
        /* RX event */
        {
                .start = AM33XX_DMA_MCASP0_R,
                .end = AM33XX_DMA_MCASP0_R,
                .flags = IORESOURCE_DMA,
        },
};      
        
static struct platform_device am335x_mcasp0_device = {
        .name = "davinci-mcasp",
        .id = 0,
        .num_resources = ARRAY_SIZE(am335x_mcasp0_resource),
        .resource = am335x_mcasp0_resource,
};
        
void __init am335x_register_mcasp0(struct snd_platform_data *pdata)
{       
        am335x_mcasp0_device.dev.platform_data = pdata;
        platform_device_register(&am335x_mcasp0_device);
}

sound/soc/davinci/davinci-evm.c

static struct snd_soc_dai_link am335x_evm_dai = {
        .name = "TLV320AIC3X",
        .stream_name = "AIC3X",        
        .cpu_dai_name = "davinci-mcasp.0",
        .codec_dai_name = "tlv320aic3x-hifi",        
        .codec_name = "tlv320aic3x-codec.2-001b",
        .platform_name = "davinci-pcm-audio",
        .init = evm_aic3x_init,
        .ops = &evm_ops,
};

Thanks

Mehmet

0 Arun Joseph over 12 years ago in reply to Mehmet Kurnaz15096

TI__Expert 7220 points

Hi Mehmet,

So it seems you have enabled audio in beaglebone_dev_cfg.

But Android AUDIO is still stubbed. After you verify alsa_aplay & arecord working, you can do the following

diff --git a/BoardConfig.mk b/BoardConfig.mk
index a377aa6..b74f585 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -7,9 +7,9 @@ TARGET_NO_RADIOIMAGE := true

USE_CAMERA_STUB := true

-BOARD_USES_GENERIC_AUDIO := true
-#BOARD_USES_ALSA_AUDIO := true
-#BUILD_WITH_ALSA_UTILS := true
+#BOARD_USES_GENERIC_AUDIO := true
+BOARD_USES_ALSA_AUDIO := true
+BUILD_WITH_ALSA_UTILS := true

BUILD_PV_VIDEO_ENCODERS := 1

Also note that, you need to perform a complete clean and rebuilt to build the right android audio libraries.

0 Mehmet Kurnaz15096 over 12 years ago in reply to Arun Joseph

Intellectual 560 points

Arun,

Thanks, It is ok.

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Audio by MCASP0 on BeagleBone