From b53ba9aee29bf6192726df7a6e60003992f8bea5 Mon Sep 17 00:00:00 2001
From: lensferno <lensferno@outlook.com>
Date: Wed, 20 Mar 2024 10:20:22 +0800
Subject: [PATCH] doc: add readme.md

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+# evrooig
+
+只是一个简单的单片机课设
+
+DHT11环境温度/湿度检测+RTC电子时钟，SSDSSD1306 128x64LED显示屏输出界面，可使用4x4矩阵键盘修改时间
+
+## 环境
+
+开发框架：platformio
+
+```text
+platform = timsp430
+board = lpmsp430f5529
+framework = arduino
+build_flags = -std=c++0x
+```
+
+开发：vscode/clion，安装platformio插件
+
+## 硬件
+
+开发板：Ti MSP430F5529 LaunchPad
+
+温湿度传感器：DHT11
+
+LED显示屏：SSDSSD1306 128x64，SPI协议
+
+4x4矩阵键盘
+
+## IO引脚连接
+
+DHT11: 
+  - data: P1.6 (GPIO)
+
+LED显示屏:
+  - SPI_CS(CS): P2.6 (GPIO)
+  - SPI_DC(DC): P2.4 (GPIO)
+  - SPI_RESET(RST): P2.5 (GPIO)
+  - SPI_MOSI(D1): P3.0
+  - SPI_CLK(D0): P3.2
+  
+4x4矩阵键盘:
+  - row: P1_5 P1_4 P1_3 P1_2 (GPIO)
+  - col: P4_3 P4_0 P3_7 P8_2 (GPIO)
+
+## 键盘按键定义
+
+```cpp
+/**
+ *     C1 C2 C3 C4
+ *　R1  *  *  *  *
+ *　R2  *  *  *  *
+ *　R3  *  *  *  *
+ *　R4  *  *  *  *
+ */
+
+enum Keys {
+  NUM7,   NUM8,   NUM9,   KEY_ADD,
+  NUM4,   NUM5,   NUM6,   KEY_MINUS,
+  NUM1,   NUM2,   NUM3,   KEY_OK,
+  NUM0,   KEY_L,  KEY_R,  KEY_CANCEL,
+  NO_KEY = -1,
+};
+```
+
+例：R2高电平时，C3读得高电平，识别为按下`NUM6`按键
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