RS232-i2c 并口模拟I2C、SPI总线驱动

对SPI flash ，SST25VF016B进行快速读写，采用软件模拟SPI总线的SPI0模式。-On the SPI flash, SST25VF016B fast read and write, using software to simulate the SPI bus SPI0 mode.

单片机nrf82532驱动液晶屏,使用串口驱动程序，很好是节约单片机输出口。(The single-chip nrf82532 drives the LCD screen and USES the serial driver, which is very good to save the single chip.)