用QT编写的通过SPI读写DSP中的参数程序，采用qt中的多线程实现读写-QT prepared using DSP via SPI read and write parameters in the program, using qt of multithreading reader

对RS232,rs485串口进行初始化，设置串口参数，用select多路复用对其进行读写操作。-For RS232, rs485 serial port initialization, set the serial port parameters, with multiplexer to read and write operations.