DSD mode not detected correctly in AudioHwConfig()

[michele-perrone]

Hi all! I'm using an XK-EVK-XU316 board and I enabled DSD playback. In xua_defs.h, I defined all that was necessary:

/* DSD defines for lib_xua */
#define NATIVE_DSD         (0)  /* Support only DoP */
#define DSD_CHANS_DAC      (2)  /* Stereo output */
#define PORT_DSD_DAC0      PORT_I2S_DAC_DATA
#define PORT_DSD_DAC1      PORT_I2S_ADC_DATA
#define PORT_DSD_CLK       PORT_MCLK_IN

#define I2S_CHANS_ADC      (0)

Code compiles fine and Audirvana Studio detects the DSD64 DoP capability.

After getting some help on the forum, I was able to access the 4 LEDs from inside void AudioHwConfig(), and I'm toggling LEDs 1-3 based on the PCM sampling rate. Next thing I needed to do was toggling LED 0 based on DSD or PCM playback, so I added this switch-case at the top of the function (I took out the code which switches on/off the LEDs because that's not relevant here):

void AudioHwConfig(unsigned samFreq, unsigned mClk, unsigned dsdMode,
    unsigned sampRes_DAC, unsigned sampRes_ADC)
{
    assert(samFreq >= 22050);

    // Turn on/off LED 0 according to dsdMode
    switch(dsdMode) {
        case DSD_MODE_OFF:
            // Turn LED 0 on
            break;
        case DSD_MODE_NATIVE:
            // LED 0 off
            break;
        case DSD_MODE_DOP:
            // LED 0 off
            break;
        default:
            break;
    }

I'm able to play DSF files at DSD64/128 with Audirvana and Foobar2000 using DoP 1.0, but LED 0 doesn't turn off when I do so. It's always on, which means that the argument unsigned dsdMode must be wrong somehow.

Any ideas on this?

Many thanks,
Michele

[michele-perrone]

Okay, after further investigation it looks the problem isn't what it seemed. The XMOS detects the flags correctly, however it crashes when trying to switch to DoP mode:

xrun: Program received signal ET_ILLEGAL_RESOURCE, Resource exception.
      [Switching to tile[1] core[0] (dual issue)]
      ConfigAudioPorts (p_i2s_dac=@0x840a0, numPortsDac=2, p_lrclk=0, p_bclk=66304, divide=8, clk_audio_bclk=774, p_mclk_in=2097158, curSamFreq=<value optimized out>) at /home/michele/Projects/DWE-GIT/G26/xmos/lib_xua/lib_xua/src/core/ports/audioports.xc:39

      39                asm volatile ("setc res[%0], %1" :: "r" (p_lrclk), "r" (0x200006));

So I'm closing this issue.