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README
MIT

此工程实现MCU通过SPI的AT指令集访问ESP8266

硬件连接

         MCU                                        ESP8266
|----------------------|                    |----------------------|
|                 GPIO |------------------->|RST                   |
|                      |                    |                      |
|                   CS |------------------->|HSPI_CS(IO15)         |
|                  CLK |------------------->|HSPI_CLK(IO14)        |
|                 MISO |<-------------------|HSPI_MISO(IO12)       |
|                 MOSI |------------------->|HSPI_MOSI(IO13)       |
|                      |                    |                      |
|                 GPIO |<-------------------|WR(IO0)               |
|                 GPIO |<-------------------|RD(IO2)               |
|                      |                    |                      |
|----------------------|                    |----------------------|

ESP8266引脚定义

PIN NAME I/O Description
15 RST IN ESP8266复位脚,低电平复位
6 HSPI_CS(IO15) IN ESP8266 HSPI片选
3 HSPI_CLK(IO14) IN ESP8266 HSPI时钟
4 HSPI_MISO(IO12) OUT ESP8266 HSPI数据输出
5 HSPI_MOSI(IO13) IN ESP8266 HSPI数据输入
8 WR(IO0) OUT ESP8266 高电平时主机可写数据,低电平不可写
7 RD(IO2) OUT ESP8266 高电表示SPI有数据需要主机读取

通信协议

硬件上MCU与ESP8266的HSPI通信使用HSPI的双线通信,具体参考《ESP8266 SPI透传协议(双线).pdf》

MCU与ESP8266 SPI一帧传输固定32字节,格式如下:

Bytes 1 2 3 4 5-32
Filed cmd block num block index size payload
其中:

cmd:表示当前传输的命令,目前仅传输AT指令cmd固定为1

block num:该次数据分成的数据块数

block index:当前传输的块序号,范围从1到block num

size:当前数据帧中有效数据的长度,若block index小于block num,则该值应固定为28,否则应小于等于28

payload:数据内容

MIT License Copyright (c) 2022 启岩 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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