操作单片机flash的例程，包括读写，这里所用MCU是SW1500，这是国内一家叫华芯微特（英文名Synwit）的公司开发的基于M0内核的单片机-this demo code is used to operate the MCU s flash ,and the MCU in the code is SW1500,and this MCU is designed by Synwit,a democratic company.