外挂SD卡¶
概述¶
本文主要介绍外挂FLASH_CSNP4GCR01-BOW型号SD卡。
SD卡数据手册：https://item.szlcsc.com/datasheet/CSNP4GCR01-BOW/2801454.html
SD卡功能流程图¶
管脚定义¶
SD卡管脚定义¶
| PIN | PIN NAME | SD MODE TYPE | SPI MODE NAME | SPI MODE DESCRIPTION |
|---|---|---|---|---|
| 1 | SDD2 | I/O/PP | RSV | Reserved |
| 2 | CD/SDD3 | I/O/PP | CS | Chip Select (Neg True) |
| 3 | SCLK | I | SCLK | Clock |
| 4 | VSS | S | VSS | Supply Voltage Ground |
| 5 | CMD | PP | DI | Data In |
| 6 | SDD0 | I/O/PP | DO | Data Out |
| 7 | SDD1 | I/O/PP | RSV | Reserved |
| 8 | VCC | S | VCC | Supply Voltage |
模组管脚定义¶
| PIN | PIN NAME | FUNC |
|---|---|---|
| 62 | USIM2_CLK | SPI0_SSn0 |
| 64 | USIM2_DATA | SPI0_MOSI |
| 28 | AUX_RXD | SPI0_MISO |
| 29 | AUX_TXD | SPI0_SCLK |
模组和SD卡管脚连接¶
AT 用例¶
| 命令（→）/ 返回（←） | 实例 | 说明 |
|---|---|---|
| → | AT+FSMEM=D:\ | 查询SPI NAND剩余空间 |
| ← | +FSMEM: 504348672 bytes OK |
|
| → | AT+FSCREATE=D:\file.txt | 创建文件 |
| OK | ||
| → | AT+FSWRITE=D:\file.txt,1,10,10000 | 写文件 |
| → | 1234567890 | |
| ← | OK | |
| → | AT+FSREAD=D:\file.txt,0,10,0 | 读文件 |
| ← | 1234567890 OK |
|
| → | AT+FSFLSIZE=D:\file.txt | 获取文件大小 |
| ← | +FSFLSIZE: 10 OK |
|
| → | AT+FSMKDIR=D:\DIR | 创建目录 |
| ← | OK | |
| → | AT+FSLS=D:\ | 列出D盘根目录信息 |
| ← | DIR\ file.txt OK |
|
| → | AT+FSDEL=D:\file.txt | 删除文件 |
| ← | OK | |
| → | AT+FSRMDIR=D:\DIR | 删除目录 |
| ← | OK | |
| → | AT+FSLS=D:\ | 列出D盘根目录信息 |
| ← | OK | 没有任何文件或者目录 |