{"id":1307,"date":"2026-06-29T08:25:41","date_gmt":"2026-06-29T08:25:41","guid":{"rendered":"https:\/\/www.nvixeon.com\/adding-qspi-flash-to-stm32f4-w25q128-driver-and-example-code\/"},"modified":"2026-07-13T01:39:16","modified_gmt":"2026-07-13T01:39:16","slug":"adding-qspi-flash-to-stm32f4-w25q128-driver-and-example-code","status":"publish","type":"post","link":"https:\/\/www.nvixeon.com\/fr\/adding-qspi-flash-to-stm32f4-w25q128-driver-and-example-code\/","title":{"rendered":"Adding QSPI Flash to STM32F4: W25Q128 Driver and Example Code"},"content":{"rendered":"\t\t
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Introduction<\/h3>\n

The STM32F4CEU6 microcontroller provides 512KB of internal flash, which is sufficient for firmware but limited for data-heavy applications. When storing sensor logs, configuration files, audio data, or display assets, external flash becomes essential.<\/p>\n

The W25Q128JV is a 16MB SPI NOR flash chip from Winbond, widely used in embedded systems due to its reliability, speed, and low cost. The NVX-F4 Flash board integrates this chip pre-wired and ready for immediate use.<\/p>\n

This guide explains how to interface the W25Q128JV with STM32F4 using SPI, configure it in STM32CubeMX, and build a complete driver for read, write, and erase operations.<\/p>\n

\n

W25Q128JV Specifications<\/h2>\n
    \n
  • Capacity: 128Mbit (16MB)<\/li>\n
  • Interface: SPI \/ Dual SPI \/ Quad SPI<\/li>\n
  • Max Clock: 133MHz<\/li>\n
  • Page Size: 256 bytes<\/li>\n
  • Sector Size: 4KB<\/li>\n
  • Block Size: 64KB<\/li>\n
  • Voltage: 2.7V \u2013 3.6V<\/li>\n
  • JEDEC ID: 0xEF4018<\/li>\n<\/ul>\n
    \n

    STM32F4 SPI Flash Wiring<\/h2>\n

    The NVX-F4 board already connects the flash to SPI1. For custom setups:<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Flash Pin<\/th>\nSTM32 Pin<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
    CS<\/td>\nPA4<\/td>\nChip Select<\/td>\n<\/tr>\n
    DO<\/td>\nPA6<\/td>\nMISO<\/td>\n<\/tr>\n
    DI<\/td>\nPA7<\/td>\nMOSI<\/td>\n<\/tr>\n
    CLK<\/td>\nPA5<\/td>\nSCK<\/td>\n<\/tr>\n
    WP<\/td>\n3.3V<\/td>\nWrite Protect (disabled)<\/td>\n<\/tr>\n
    HOLD<\/td>\n3.3V<\/td>\nHold (disabled)<\/td>\n<\/tr>\n
    VCC<\/td>\n3.3V<\/td>\nPower<\/td>\n<\/tr>\n
    GND<\/td>\nGND<\/td>\nGround<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    CubeMX Configuration<\/h2>\n

    Configure SPI1 as follows:<\/p>\n

      \n
    • Mode: Full-Duplex Master<\/li>\n
    • Data Size: 8-bit<\/li>\n
    • Clock Polarity: Low<\/li>\n
    • Clock Phase: 1 Edge (SPI Mode 0)<\/li>\n
    • Baud Rate: Start around 10MHz<\/li>\n
    • GPIO: PA4 as Output (FLASH_CS)<\/li>\n<\/ul>\n

      Generate project code after configuration.<\/p>\n

      \n

      Full SPI Flash Driver<\/h2>\n

      Initialization<\/h3>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      void<\/span> W25Q128_Init<\/span>(SPI_HandleTypeDef<\/span> *<\/span>hspi<\/span>) {
          _hspi<\/span> =<\/span> hspi<\/span>;
          FLASH_CS_HIGH<\/span>();
      }<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Read Device ID<\/h3>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      uint32_t<\/span> W25Q128_ReadID<\/span>(void<\/span>) {
          uint32_t<\/span> id<\/span> =<\/span> 0<\/span>;
      <\/p>\n
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x9F<\/span>);<\/p>\n
          id<\/span> =<\/span> (uint32_t<\/span>)SPI_Transfer<\/span>(0xFF<\/span>) <<<\/span> 16<\/span>;
          id<\/span> |=<\/span> (uint32_t<\/span>)SPI_Transfer<\/span>(0xFF<\/span>) <<<\/span> 8<\/span>;
          id<\/span> |=<\/span> SPI_Transfer<\/span>(0xFF<\/span>);<\/p>\n<\/code>
          FLASH_CS_HIGH<\/span>();
          return<\/span> id<\/span>;
      }<\/code><\/p><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Read Data<\/h3>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      void<\/span> W25Q128_Read<\/span>(uint32_t<\/span> addr<\/span>, uint8_t<\/span> *buf<\/span>, uint16_t<\/span> len<\/span>) {
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x03<\/span>);
      <\/p>\n
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 16<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 8<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>(addr<\/span> &<\/span> 0xFF<\/span>);<\/p>\n
          for<\/span> (uint16_t<\/span> i<\/span> =<\/span> 0<\/span>; i<\/span> <<\/span> len<\/span>; i<\/span>++<\/span>)
              buf<\/span>[i<\/span>] =<\/span> SPI_Transfer<\/span>(0xFF<\/span>);<\/p>\n<\/code>
          FLASH_CS_HIGH<\/span>();
      }<\/code><\/p><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Page Write<\/h3>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      void<\/span> W25Q128_WritePage<\/span>(uint32_t<\/span> addr<\/span>, uint8_t<\/span> *buf<\/span>, uint16_t<\/span> len<\/span>) {
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x06<\/span>); \/\/ Write enable<\/span>
          FLASH_CS_HIGH<\/span>();
      <\/p>\n
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x02<\/span>);<\/p>\n
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 16<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 8<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>(addr<\/span> &<\/span> 0xFF<\/span>);<\/p>\n
          for<\/span> (uint16_t<\/span> i<\/span> =<\/span> 0<\/span>; i<\/span> <<\/span> len<\/span>; i<\/span>++<\/span>)
              SPI_Transfer<\/span>(buf<\/span>[i<\/span>]);<\/p>\n<\/code>
          FLASH_CS_HIGH<\/span>();
          W25Q128_WaitBusy<\/span>();
      }<\/code><\/p><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Sector Erase<\/h3>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      void<\/span> W25Q128_EraseSector<\/span>(uint32_t<\/span> addr<\/span>) {
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x06<\/span>);
          FLASH_CS_HIGH<\/span>();
      <\/p>\n
          FLASH_CS_LOW<\/span>();
          SPI_Transfer<\/span>(0x20<\/span>);<\/p>\n
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 16<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>((addr<\/span> >><\/span> 8<\/span>) &<\/span> 0xFF<\/span>);
          SPI_Transfer<\/span>(addr<\/span> &<\/span> 0xFF<\/span>);<\/p>\n<\/code>
          FLASH_CS_HIGH<\/span>();
          W25Q128_WaitBusy<\/span>();
      }<\/code><\/p><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Example Usage<\/h2>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
       <\/div>\n<\/div>\n<\/div>\n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      \n
      W25Q128_Init<\/span>(&<\/span>hspi1<\/span>);
      <\/p>\n
      uint32_t<\/span> id<\/span> =<\/span> W25Q128_ReadID<\/span>();<\/p>\n
      W25Q128_EraseSector<\/span>(0x000000<\/span>);<\/p>\n
      uint8_t<\/span> write_buf<\/span>[16<\/span>] =<\/span> \"NVX-F4 TEST DATA\"<\/span>;
      W25Q128_WritePage<\/span>(0x000000<\/span>, write_buf<\/span>, 16<\/span>);<\/p>\n<\/code>
      uint8_t<\/span> read_buf<\/span>[16<\/span>] =<\/span> {0<\/span>};
      W25Q128_Read<\/span>(0x000000<\/span>, read_buf<\/span>, 16<\/span>);<\/code><\/p><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
       <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      \n
      Important Notes<\/h2>\n
        \n
      • Flash must be erased before writing<\/li>\n
      • Writes cannot cross 256-byte page boundaries<\/li>\n
      • Each sector supports ~100,000 erase cycles<\/li>\n
      • Always wait for BUSY flag after write\/erase operations<\/li>\n<\/ul>\n
        \n
        Conclusion<\/h2>\n
        The W25Q128JV makes it easy to extend STM32F4 storage far beyond internal flash limits. With SPI1 integration on the NVX-F4 board, no external wiring is required, making it ideal for data logging, firmware storage, and embedded applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
        A complete guide to interfacing the W25Q128JV 16MB QSPI NOR Flash with the STM32F4. Covers wiring, CubeMX configuration, HAL SPI driver, read\/write\/erase operations, and data logging example \u2014 all tested on the NVX-F4 Flash board.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[60,62],"tags":[],"class_list":["post-1307","post","type-post","status-publish","format-standard","hentry","category-stm32f4","category-tutorials-guides"],"blocksy_meta":[],"yoast_head":"\nSTM32F4 QSPI Flash Guide: W25Q128 Driver & Example Code<\/title>\n<meta name=\"description\" content=\"Learn how to add W25Q128 QSPI NOR flash to an STM32F4 project, with driver code and examples for logs, configs, and assets.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nvixeon.com\/fr\/adding-qspi-flash-to-stm32f4-w25q128-driver-and-example-code\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"STM32F4 QSPI Flash: W25Q128 Full Driver and Example Code\" \/>\n<meta property=\"og:description\" content=\"Complete W25Q128JV QSPI flash driver for STM32F4. 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