avr (atmega128)模拟spi时序，读写AT45DB161D-avr (atmega128) analog spi timing, reading and writing AT45DB161D

在cortex-m3处理器下，关于芯片AT45DB161D的spi通信实现程序。-Under Cortex-M3 processor, SPI communication program of AT45DB161D chip

利用Ginkgo USB-SPI适配器读写控制AT45DB161D存储器芯片源码，程序中有详细的注释，对需要读写控制AT45DB161D芯片的人具有较高的参考价值-The use of Ginkgo USB-SPI adapter memory chips read and write control AT45DB161D source program are detailed in the notes on the need to control AT45DB161D chip reader