TCA6408A驱动程序：实现函数有， unsigned char TCA6408AWriteConfig(TCA6408ARegs * Regs); unsigned char TCA6408AWriteOutput(TCA6408ARegs * Regs); unsigned char TCA6408AWritePolarity(TCA6408ARegs * Regs); void TCA6408AInitDefault(TCA6408ARegs* Regs); unsigned char