I am not sure why this isn't working, but I've checked my settings multiple times and I've looked at the signal with a scope.
The output from the Jetson Nano I am using as a master shows 48kHz FS and BCLK 6.144Mhz, both VERY stable
I turn the ALSA driver on so I can watch the signals coming out, and then I also check the status registers as its supposed to be streaming
I am asking for TDM, 32-bit, 4 channel
ASI_STS keeps changed from 0x46 to 0x36 to 0xf6. 6 = correct for second part, I do not understand why it's having trouble locking on to the signal.
IT_LTCH0 shows as c0 which indicates both interrupt are being tripped for bad combination of FS and BCLK
DEV_STS0 = 0x0 , so it shut all the channels off
DEV_STS1 =0xc0, indicates all powered down.
I tried telling it to ignore the errors, but the output still does not change on SDOUT
The other odd thing is I have to write the wake up twice. If I write it once and wait 1ms then continue, it doesn't seem to work. But if I call twice, and recheck all registers, they are all correct
// Wake up device
spiADC(FD_AUD,0x02,0x81,0); //0 for last element indicates write
spiADC(FD_AUD,0x02,0x81,0);
std::this_thread::sleep_for(std::chrono::milliseconds(10));
printf("A Check Sleep Mode: %x\n",spiADC(FD_AUD,0x02,0x00,1));
// TDM & 32-bit (I2S only supports 2 channels, need TDM which supports 4) Also BCLK needs to be inverted
spiADC(FD_AUD,0x07,0x34,0);
// Let's turn off bus error detection
//spiADC(FD_AUD,0x09,0x20,0);
// 0x13 we leave default, sets in slave mode
// Setup line inputs for all 4 channels
spiADC(FD_AUD, 0x3C, 0xF0,0);
spiADC(FD_AUD, 0x41, 0xF0,0);
spiADC(FD_AUD, 0x46, 0xF0,0);
spiADC(FD_AUD, 0x4B, 0xF0,0);
// Enable all 4 ADC
spiADC(FD_AUD,0x73,0xF0,0);
// Enable ASI 4 output slots
spiADC(FD_AUD,0x74,0xF0,0);
// Power up ADC and PLL (not sure if these are right)
spiADC(FD_AUD,0x75,0x60,0);
Then from here it is calling ALSA driver.
