{"id":12655,"date":"2024-04-06T11:48:01","date_gmt":"2024-04-06T09:48:01","guid":{"rendered":"https:\/\/deepbluembedded.com\/?p=12655"},"modified":"2024-04-06T11:48:03","modified_gmt":"2024-04-06T09:48:03","slug":"stm32-sdmmc-tutorial-examples-dma","status":"publish","type":"post","link":"https:\/\/deepbluembedded.com\/stm32-sdmmc-tutorial-examples-dma\/","title":{"rendered":"STM32 SDMMC Tutorial With Examples + DMA"},"content":{"rendered":"\n

This is a comprehensive guide for STM32 SDMMC SD Card Interfacing With FatFS Library<\/strong>. You’ll learn how to use SD Cards with STM32 microcontrollers using the SDMMC interface. We’ll create some STM32 SD Card Example Test Projects to verify what we’ll learn in this tutorial.<\/p>\n\n\n

Table of Contents<\/h2>\n
    \n
  1. STM32 SDMMC<\/a>\n\n\n<\/li>\n\n
  2. STM32 SDMMC SD Card Interfacing<\/a>\n\n\n<\/li>\n\n<\/li>\n\n
  3. STM32 SDMMC (4-Bit Mode) FatFS Example Project<\/a>\n\n\n\n<\/li>\n\n
  4. STM32 SDMMC DMA Example<\/a>\n\n<\/li>\n
  5. Wrap Up<\/a>\n<\/li><\/ol>\n\n\n
    \n\n\n

    STM32 SDMMC<\/strong><\/h2>\n\n\n

    Some STM32 microcontroller series have an integrated SDMMC hardware peripheral that’s designed specifically to interface SD cards at the maximum operating speed. The SDMMC interface provides an interface between the AHB bus and (SD memory cards, SDIO cards, and eMMC devices).<\/p>\n\n\n\n

    However, SD cards can still be used over SPI communication which is available in all STM32 microcontrollers and pretty much every single microcontroller in the market. We’ve already focused on STM32 SD Card SPI interfacing<\/a><\/strong> in this previous tutorial, and STM32 SDIO Interface<\/a><\/strong> in this other previous tutorial. Therefore, in today’s tutorial, we’ll shift the attention to using the STM32 SDMMC interface for SD Card handling.<\/p>\n\n\n

    STM32 SPI Vs SDIO Vs SDMMC<\/strong><\/h3>\n\n\n

    SPI<\/strong> is a generic serial peripheral interface and can still be used to interface SD cards with low-end microcontrollers at a relatively lower speed of communication and a much simpler software stack. That’s why SPI is the most commonly used interface for SD cards in a lot of projects.<\/p>\n\n\n\n

    SDIO<\/strong> is a hardware peripheral designed specifically for interfacing (SD Cards, SDIO Cards, and MultiMedia Cards “MMC”) with the APB2 peripheral bus in “some” of the STM32 microcontrollers. Given that it’s dedicated to SD card interfacing, it’s going to be a much faster way of communicating with SD cards (4x the speed you can get with an SPI interface).<\/p>\n\n\n\n

    SDMMC<\/strong> is a hardware peripheral designed specifically for interfacing (SD memory cards, SDIO cards, and eMMC devices) with the APB2 peripheral bus in “some” of the STM32 microcontrollers. It’s almost identical to the SDIO interface but it supports eMMC devices additionally and can go up to way higher transfer speeds (in 8-Bit mode).<\/p>\n\n\n

    STM32 SDMMC Features<\/strong><\/h3>\n\n\n