VSDSP Forum

In vs1000 there is a common shutdown bit for all regulators. Also, in vs1000 the crystal oscillator works from IOVDD, so turning off IOVDD would mean the chip can never start up under software control anymore. The same applies to xRESET, that is referenced to IOVDD, and would assert if IOVDD is lost...

However, are there any commands I can transmit to the stock firmware on vs1053b through a serial terminal to see that it responds at all? I haven't been able to get any response from it yet. The RT-Midi mode takes over the UART, but if you power up in normal mode (GPIO0 and GPIO1 low, or both high ...

Take a look at VS1003b/VS1033c/VS1053b Real-Time MIDI Input Application from https://www.vlsi.fi/en/support/software/vs10xxapplications.html . The vs1053b version contains a fixed handclap sound and a few others. When you get that working with the Adafruit board, I can compile versions with differen...

The Audio output FIFO is 2048 stereo samples, 46.4ms at 44100Hz samplerate. The vs1053b realtime MIDI mode generates 64 new samples whenever the fill state is < 512 samples (8*64), i.e. 11.6ms at 44100Hz. So, this matches your observations. The threshold could be reduced by replacement code/patch. H...

Yeah, random issues are hard to figure out.

You are probably just using one board and cannot compare the operation between different individuals?

Hi, The file plays with vs1053b-patches active (tested with version 2.9), but doesn't play without the vs1053b-patches. The serial number is 0x9dff06f8, and looking at the Vorbis-related fixed I don't see any other reason why the file would not play without the patches. Maybe the patch upload has is...

Declaring 24-bit and 32-bit sample sizes in the USB Audio descriptor is easy. However, most of the time 16 bits is already enough to reach the limit of the digital to analog converter. The extra bits can be ignored and the result is exactly the same. Even when using an (external) ADC and/or DAC that...

The list gets bigger the more into detail you go about the functionality. The ROM functionality is described in the datasheets. For the slave decoders the first page of the datasheet lists the important things like decoders, encoders, and "effects". The functionality can be extended by loa...

SCI_HDAT1 is the SCI register number 9. See the datasheet for the SCI register descriptions. (There are only 16 SCI registers, so 0x1a may be interpreted as SCI_AIADDR.)

HDAT1 is 0 when nothing is decoded and shows the detected format otherwise.

VS1063a has speed/pitch shifter in ROM, and vs1053b-patches package has a loadable code that implements the same for vs1053b. These are slave decoder chips to be used with your own controller. vs1005 also has a driver to implement speed/pitch shifter. vs1000 can also do pitch shifting (http://www.vs...