.. _spi_sdcard: SPI操作SDCARD ====================== 概述 ------ 该实例工程展示了使用SPI接口读写SD卡。 硬件设置 ------------ - :ref:`SPI引脚 ` 根据板子型号查看具体信息 - SPI引脚对应好SD卡(模块)引脚 注意事项 ------------ - 该实例工程依赖SPI组件和DMA管理器组件，需要进行使能该组件。 - 考虑到各类SD卡兼容性，SPI sdcard库中的写操作中，有些SD卡需要进行写等待延时。移植时可以参考common/adapt/spi_sd_adapt.c, 需要注意以下三点： - 1.内部延时默认100us，如果需要改其他延时可以通过重新定义SPI_SD_DELAY_DEFAULT_US宏 - 2.如果不需要该写等待延时, 可以把sdcard_spi_init API的传参的结构体成员delay_ms和delay_us置为NULL。或者SPI_SD_DELAY_DEFAULT_US宏定义为0 - 3.如果需要该写等待延时, 并且是在RTOS环境下，建议sdcard_spi_init初始化API在任务中调用，并且传参的结构体成员delay_ms和delay_us赋值为RTOS的任务延时API，比如freertos的vTaskDelay 运行现象 ------------ - 确认硬件无误后，工程正确运行后，串口终端会输出如下信息： .. code-block:: console [spi_sdcard] SPI CLK frequency:400000 Hz [spi_sdcard] SPI CLK frequency:40000000 Hz SD Card initialization succeeded Card Info: ----------------------------------------------- Card Size in GBytes: 14.84GB Block count: 31116288 block Block Size: 512 Bytes ----------------------------------------------- sdcard wiite/read verify .... sd block_31116268 write PASSED sd block_31116268 read PASSED SD write-read-verify block 0x01dacbec PASSED sd block_31116269 write PASSED sd block_31116269 read PASSED SD write-read-verify block 0x01dacbed PASSED sd block_31116270 write PASSED sd block_31116270 read PASSED SD write-read-verify block 0x01dacbee PASSED sd block_31116271 write PASSED sd block_31116271 read PASSED SD write-read-verify block 0x01dacbef PASSED sd block_31116272 write PASSED sd block_31116272 read PASSED SD write-read-verify block 0x01dacbf0 PASSED sd block_31116273 write PASSED sd block_31116273 read PASSED SD write-read-verify block 0x01dacbf1 PASSED sd block_31116274 write PASSED sd block_31116274 read PASSED SD write-read-verify block 0x01dacbf2 PASSED sd block_31116275 write PASSED sd block_31116275 read PASSED SD write-read-verify block 0x01dacbf3 PASSED sd block_31116276 write PASSED sd block_31116276 read PASSED SD write-read-verify block 0x01dacbf4 PASSED sd block_31116277 write PASSED sd block_31116277 read PASSED SD write-read-verify block 0x01dacbf5 PASSED sd block_31116278 write PASSED sd block_31116278 read PASSED SD write-read-verify block 0x01dacbf6 PASSED sd block_31116279 write PASSED sd block_31116279 read PASSED SD write-read-verify block 0x01dacbf7 PASSED sd block_31116280 write PASSED sd block_31116280 read PASSED SD write-read-verify block 0x01dacbf8 PASSED sd block_31116281 write PASSED sd block_31116281 read PASSED SD write-read-verify block 0x01dacbf9 PASSED sd block_31116282 write PASSED sd block_31116282 read PASSED SD write-read-verify block 0x01dacbfa PASSED sd block_31116283 write PASSED sd block_31116283 read PASSED SD write-read-verify block 0x01dacbfb PASSED sd block_31116284 write PASSED sd block_31116284 read PASSED SD write-read-verify block 0x01dacbfc PASSED sd block_31116285 write PASSED sd block_31116285 read PASSED SD write-read-verify block 0x01dacbfd PASSED sd block_31116286 write PASSED sd block_31116286 read PASSED SD write-read-verify block 0x01dacbfe PASSED SD write-read-verify reach the total count:19 PASSED!!!! sdcard wiite/read speed test.... SD write-read-verify block range 0x01dacbec-0x01dacbff PASSED Write Speed: 2532.18KB/s, Read Speed: 3021.68KB/s Test completed, PASSED