5、SD卡下SPI操作模式 SD卡初始化 SPI操作模式下:在SD卡收到复位命令时,CS为有效电平(低电平),则SPI模式被启用,在发送CMD之前要先发送74个时钟,64个为内部供电上升时间,10个用于SD卡同步;之后才能开始CMD操作,在初始化时CLK时钟不能超过400KHz。 1、初始化与SD卡连接的硬件条件(MCU的SPI配置,IO口配置); 2...
printf("Card Type= %d\r\n", cardInfo.CardType); printf("Card Version= %d\r\n", cardInfo.CardVersion); printf("Card Class= %d\r\n", cardInfo.Class); printf("Relative Card Address= %d\r\n", cardInfo.RelCardAdd); printf("Block Count= %d\r\n", cardInfo.BlockNbr); printf("Bl...
在读取扇区的数据之前，发送一个SD Card OK的消息。然后调用HAL_SD_ReadBlocks函数来读取扇区的内容。
/* * sd_card.c * * Created on: 2021年11月26日 * Author: heng.liao */ #include "sd_card.h" #include <stdio.h> #include "spidrv.h" #include "sl_udelay.h" uint8_t SD_Type; /* * 取消片选,释放SPI总线 * * 参数:void * 返回值:void * */ void SD_DisSelect(void) { SD_CS...
SD 的 SPI mode 最大传输速率为 25 Mbit/s。 为避免混淆,有时也用 SPI/MMC mode 与 SPI/SD mode 的写法来做清楚区别。 参考网站: sdcard.org/developers/o interfacebus.com/Secure 二、MMC子系统介绍 MMC代码分布 MMC子系统代码主要在drivers/mmc目录下,共有三个目录: Card:存放闪存卡(块设备)的相关驱...
SD Card Module Pinout: The diagram shows the detailed connections of the SD module with ESP32. MOSI - pin 23 MISO - pin 19 CLK - pin 18 CS - pin 5 MicroSD Card Hardware Connection with ESP32 ESP32 interfacing with Micro SD Card ...
I have been working on designing a PCB board for IoT usage and I am in a stage where all the peripherals and sensors work, except the micro-SD card reader. The board has the following sensors and modules connected in the respective pinout: 1. ATGM336H-5N31 - SD2, SD3 2. Ra-02 ...
SPI模式下对SD卡的读写控制
The pinout for SD cards is as follows: SD cards support two communications protocols: SD Bus and SPI Bus (there are also UHS-II Bus and PCIe Bus protocols supported by some newer cards with additional pins, however SD Bus and SPI Bus are by far the most common). As practically all mod...
单击Pinout & Configuration页面左边功能分类栏目最下面的Middleware and SoftwarePacks,单击其中FatFs,在右侧模式设置中选择SD卡,下方的Configuration中参数大多保持默认即可,需要使用到的时候可以再修改 对Set Defines页面的参数不理解的读者,请阅读STM32CubeMX教程26 FatFs 文件系统 - W25Q128读写实验"3.1.2、外设参数配...