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  • Sandro's Avatar
    01-09-2020, 07:36 PM
    A bad mistake I did here... i had connected the flash chip GND pin to Analog GND... shame on me. Anyway, now the small PCB is done; i'm testing it, seems working fine.
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-24-2019, 06:18 PM
    Good, thank you Neurofun. I'm designing a small pcb for the W25Q256, with a groudplane, to be soldered toghether with the Audio shield (on top, or below) ... let's see how it will perform.
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-24-2019, 12:08 PM
    Going back to W25Q256.. I read on Audio shield schematics (where an 8-pin flash memory IC is contemplated), that "RST" is indicated. While on 8pin ICs (like W25Q128) /RESET and /HOLD use the same pin, on W25Q256...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-20-2019, 10:00 PM
    I got it...Ok, thank you Frank for the explantion!
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-20-2019, 10:22 AM
    For completeness: after formatting, using normal speed playback, the report shows more or less same values and same behave: 0 218 1 7 2 217 3 7 4 2143 5 7 6 217 7 7 8 217
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-20-2019, 12:54 AM
    Hi Paul, thank you for your answer; I started adding some lines in order to get min, max and average times, and the result was so strange (for me!), that I decided to see each value; this is my code, normal speed...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-18-2019, 11:26 PM
    I'm playing with playSDraw using an SD card plugged in Teensy 3.6 built-in socket. The scope is to use the built-in SD card in place of flash memory in my midi expander, since the quad SPI could be fast enough to allow...
    1 replies | 146 view(s)
  • Sandro's Avatar
    12-18-2019, 01:09 PM
    Hi Michael, I made some tests with micro SD built on Teensy 3.6, clock 180 MHz; I played with play_SD_raw, modifying the lenght of the data array read from SD, as follows. The "core" part of play_SD_raw.cpp, a bit...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-16-2019, 11:04 PM
    Hi all, since the last posts, I've completely developed my Lilla midi expander and completely rewritten playFlashraw function. Now, going back to the beginning of my work, I notice that I neglected to use the following...
    5 replies | 592 view(s)
  • Sandro's Avatar
    12-09-2019, 07:20 PM
    The attached pic was this: In these day I went on with my tests... and this assembly showed some limit: with intense use of the chip some errors appares. I guess if a small PCB with its groun plane could help data...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-06-2019, 12:50 PM
    Sorry, here: #else Serial.println("failed!"); AudioStartUsingSPI(); #endif Serial.println("failed!") is a refuse.
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-06-2019, 12:51 AM
    Hi Michael, I had not notice that! So.. thank you for your detailed analysis: at the moment I would remain on Teensy 3.6, or maybe switch to T4.0 in a next release; and for all the topics you point out I have no...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-05-2019, 08:14 PM
    But... I found this post: https://forum.pjrc.com/threads/55662-Polyphonic-playSdRaw?highlight=playSDraw It says that for polyphonic application (mine uses 8 voices at least) it's raccomanded flash chip, not SD...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-04-2019, 12:03 PM
    New feature introduced: anticlick for loop operations
    5 replies | 930 view(s)
  • Sandro's Avatar
    12-04-2019, 11:50 AM
    Good suggestion! I had not considered this! For my application, the midi expander: https://forum.pjrc.com/threads/57897-queued-Lilla 100M for file system is more than enough!! :o
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-03-2019, 08:41 AM
    This is so important to me! I didn't know this fact of quad SPI... Maybe it means that reading data rate from micro SD card on Teensy is comparable/faster than from flash memory soldered on Audio shield.. :rolleyes:...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-03-2019, 12:25 AM
    Hi Michael, thank you for your answer; I didn't get if you are talking about W25Q256 32M 16-pin chip or about the W25Q128 16M 8-pin chip (which is not my case); I'm using SerialFlash in my code. Maybe I'm too...
    23 replies | 603 view(s)
  • Sandro's Avatar
    12-02-2019, 08:33 PM
    Hi all, I'm experimenting a W25Q256FV 16-pin SOIC 300-mil on Audio shield Rev B (on teensy 3.6, clock 240MHz), in order to store audio files to be played. Actually I have connected the flash chip with short wires: ...
    23 replies | 603 view(s)
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About Sandro

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About Sandro
Biography:
Electronic Engineer
Location:
Rimini - Italy
Interests:
music, play music, make instruments, swim, walk, see, listen, talk
Occupation:
Project manager

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Using W25Q256 on Audio shield 01-09-2020 07:36 PM
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01-10-2020 03:49 PM
Join Date
11-08-2016