采用MSP430单片机，通过SPI和PNI11096磁感应芯片通信， 两棵磁感应芯片互相垂直，用来测量磁偏角。- Using MSP430 microcontroller, through SPI and PNI11096 magnetic induction chip communication, two magnetic induction chip perpendicular to each other, used to measure declination.

IAR平台对MSP430单片机SPI通信方式SD卡读写(SD card reading and writing)