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f767-m8n-mpu9250-sd-runbuffer-'s Introduction

实验器材:
	阿波罗STM32F767开发板
	
实验目的:
	学习FreeRTOS在STM32F767上的移植
目标：实现100hz IMU + 5hz GPS数据保存在SD卡中
方案：原方案使用串口保存由于数据量过大，出现数据保存缺失的现象
		数据保存不及时的原因：
	解决方法：FatFs频繁打开、关闭文件会占用较多时间，SD卡频繁写入也会占用较多时间，这期间新的IMU数据已经过去了。
	    使用环形缓存区存储数据，将数据循环保存在缓存区中，在数据保存一定量后，再将数据统一放入SD卡中

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