STM32F446 ECG PC APP Test 心电方面的资料，Corte1-m4 核心，使用浮点加速-STM32F446 ECG PC APP Test ECG relevant information, Corte1-m4 core, floating-point acceleration

stm32f446 定时器和串口通讯,通讯的注释掉了，需要的去掉就行-stm32f446 uart timer

这是在stm32f446平台上，使用第三方库开发的一个GUI界面，通过串口接收发送数据，显示屏幕上考勤机。(This is on the stm32f446 platform, a GUI interface with third-party library development, through the serial port to send data to receive, display screen attendance machine.)

使用STM32F446实现的QSPI接口，增加了4线 SPI NAND的驱动程序，实测可以多种SPI NAND 实现基础操作，可以用来调试QSPI接口，或者SPI NAND；有兴趣的朋友可以看看(Using the QSPI interface implemented by STM32F446, the driver program of the 4-wire SPI NAND is added, which can be used to debug the QSPI interface, or