Time for some sounds

A project log for nWatch

Selfmade watch that helps You learn STM32 programming.

Peter WasilewskiPeter Wasilewski 11/01/2015 at 17:080 Comments

Hi !

Hope You all still remember my project ;) . It took so long since I've last written, because I had to change the pcb - I decided to use 16 bit fsmc bus to communicate with SRAM memory. Besides that I struggled for about a week to run the mp3 hardware decoder. At the begining I thought I burned the chip, because I mistaken and read vs1003 datasheet not vs1053. Their core voltage differs quite much - its 2,5v for vs1003 and 1.8 (1.85 max) for vs1053. Thankfully I managed to run a simple sine test. When an hour later I could hear an wav file played by my watch I was very excited. Then I decided to play an MP3 file. Problems started right away. The decoder was hanging and changing the volume by itself. That was the moment when all the excitement has gone away. I spend a few evenings trying to guess what's wrong, and today I managed to solve the problem. I lowered the core voltage from 1.95 to 1.8v. It started working without any hanging etc. Now I'm planning to play a while with this decoder (sound for the video ? ) , and when I receive new PCB I'll try to make internet radio or something simillar, just to test wifi module ;) .

Here's a screenshot of the PCB, just to show that I'm not lazing ;)

If You're intrested in building nWatch, You just have to wait a bit longer. I need some time to make sure that there are no bugs in the latest pcb. Then I'll upload all the pcb and schematic files, so that everyone can build version with SRAM, or without it .