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  • Bill Greiman's Avatar
    12-13-2021, 06:20 PM
    I posted a new version of SdFat here as 2.1.4-beta.3. It allows more old cards to be used with SDIO. More cards work on Teensy 3.x than Teensy 4.1. Often a card that fails with FIFO_SDIO will work with DMA_SDIO. ...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-09-2021, 04:30 PM
    I have been testing mods for old small V1.XX cards. I can get almost all to init with sd.begin(). Several require a power cycle before a second call to sd.begin(). Several cards will fail with FIFO_SDIO but will...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-04-2021, 01:27 PM
    Here are key milestone SD specs that apply to Teensy. The uSDHC controller only supports features up to the V3.01 May 18, 2010 Spec. The current spec is V8.0 September 2020. Version 1.01 Card Requirements (SD_SPEC...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-04-2021, 01:13 PM
    I have lots of small cards like that. They are SD2 cards and work fine. The problem involves SD1 cards produced with the April 15, 2001 V1.01 or October 15, 2004 V1.10 command structure. I have the V1.10 cards...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-03-2021, 07:58 PM
    I have made progress on SD1 cards on Teensy 4.1. The problem is not ACMD41. It is CMD8 which is the way you detect a SD1 card. There is no response to CMD8 from SD1 cards. On Teensy 4.1 a controller reset seems to...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-02-2021, 08:03 PM
    I have six cards in three sizes that fail with Teensy 4.1 but work with Teensy 3.6. My worry now is that ACMD41 is so simple and well documented that finding the problem is a real puzzle. The init for SD1 is send...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-02-2021, 04:11 PM
    I found the SD-> microSD adapter and my SD1 cards work on Teensy 3.6. Here is a really old, 16MB card: init time: 39 ms Card type: SD1 Manufacturer ID: 0X3 OEM ID: SD Product: SD016 Revision: 3.1 Serial...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-02-2021, 12:49 PM
    Looks like none of my microSD cards are V1.xx. I have lots of full size V1.xx cards and a SD to microSD adapter somewhere. I will find it or make one with a microSD sniffer. It can be crude since SD init takes place...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    12-01-2021, 12:59 PM
    The break in support is not at 2GB, it's at the May 9, 2006 V2.00 SD standard. At this point A major change in the command structure and register structure was introduced to allow expansion to greater than 2GB. To...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    11-30-2021, 05:55 PM
    Run the SdInfo example and post the error Info. It should be something like this: SD errorCode: SD_CARD_ERROR_ACMD41 = 0X17 SD errorData = 0X0 Try editing SdFat/src/SdCard/SdioTeensy.cpp at line 36 and increase...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    11-30-2021, 02:28 PM
    Have you tried any non-SDHC (2GB or smaller) cards on SDIO? No consumer cards "Standard SD" cards are being manufactured currently. I only have two microSD cards. I developed with full size cards. These are are not...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    11-29-2021, 12:38 PM
    Looks like the Samsung Evo Select is the same as the Samsung Evo Plus, just branding, Amazon had exclusive rights to the Select brands of Samsung cards. Here are images of the "New Generation" cards. They appear to...
    53 replies | 3847 view(s)
  • Bill Greiman's Avatar
    11-28-2021, 05:54 PM
    I bought cards to test the "new generation" of Samsung microSD cards. I compare these with the Kingston Canvas Go! Plus. Shared SPI write is really poor for the new Samsung cards. They are clearly designed for...
    53 replies | 3847 view(s)
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About Bill Greiman

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Which SD is Best for Audio Projects? 12-13-2021 06:20 PM
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11-07-2012