add readme

2024-09-23 19:29:27 +08:00
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+# -3DP-Ultrasonic-300K
+
+[x] 超声驱动信号（300KHz 50%duty 5cycles）发送
+
+[x] PA2/PA3配置为USART0
+
+[x] LED配置存活状态闪烁
+[ ] 超声反射回波接受与精准计时