上面是sp3539的底层函数包，主要是进行扩展串口SP3539的初始化及发送控制。对于试用SP3539采集数据的程序员来说，微微修改下就可以了-Is above the bottom of sp3539 function package, mainly for the expansion of serial SP3539 initialization and send control. SP3539 trial data collect

avr单片机发送接收sp3539多串口扩展芯片.cpu为atmega64或atmega128均可.只需将cpu128中程序的寄存器UDR改为UDR0.qt中国群218967017- avr microcontroller sending and receiving sp3539 multi-chip serial port expansion. cpu is atmega64 or atmega128 available. Simp