VSDSP Forum

Watchdog is the number one way for me to restart the system from scratch in products, e.g. after a firmware update or waking up from standby (when standby has turned off so many things that turning them back on is just unnecessarily duplicated code). In the case of vs1005 / vs1010 keeping PWRBTN hig...

So far, I haven't had success using pcflash. Programming through VSIDE's Prommer/Flasher utility has been working well. pcflash connects to the vs1000 chip in the same way as the VSIDE's prommer, so the issue is probably just in the parameters. The newest pcflash also has different erase options. O...

Unfortunately loading the firmware through USB is complex due to the small size of the VS1000's RAMDISK (6.5kB). UART is the easiest. Once the firmware is there (and supports USB mass storage for the SPI FLASH), the content could be programmed through USB, although for small contents programming the...

When I play a new file a distortion of audio around 500ms is done. I have muted the vs1053b before to send a new audio file but the issue stills present. Is SCI_HDAT1 0 before you start sending the new file? What does the distortion sound like? Is the whole 500ms distorted? What are the formats of ...

For your own tests / use, sure, you can try to power the SD from IOVDD. If you're only reading from the card, and the card goes to idle state at all, then reading will also work (most of the time). Increasing the values of the IOVDD capacitors too much may have an opposite effect instead of helping....

What are the symptoms? Are you using fast-play (and sending all of the data), or skipping?

The vs1053b is rated at 55.3MHz. If you use a high internal clock for the vs1053, then also make sure your CVDD is both stable and high enough.

What kind of completely random errors you get? Are the functions returning error codes, or the data just ends up being garbage?

What do you read from SCI_AUDATA? If you get 0xac45, then the vs1053 probably is in real-time MIDI mode. When I start my program I pull the reset pin high, wait 50ms and then pull it low using digital write xRESET is active low, so there apparently is an inverter in the line of you have the high and...

Timeout and software reset should help. If the decoder stays stuck with DREQ high, what does HDAT1 contain? The mp3 decoder should not get stuck. If there are errors for other formats, there is a larger possibility of getting stuck. If the mp3 file contains an ID3v2 tag, then it may take a long whil...

For Real-Time MIDI latency, see: http://www.vsdsp-forum.com/phpbb/viewtopic.php?p=16081 You're right that the UART FIFO has a chance of being overrun with the ROM code when a lot of notes are active (but see the above for a patch). The MIDI decoder generates output in 64-sample blocks. Volume change...