电梯控制器关于固件的ALGO级设计

大家好，我的工作是开发一个电梯控制器，不使用任何通信总线之间的电梯机舱，霍尔和控制器面板。取而代之的是所有的呼叫按钮和指示LED以及所有楼层的簧片开关直接连接（或通过继电器等）连接在GPIO引脚上。因此，在MCU上需要大量的PIN计数。例如，对于一个12层电梯，我估计大约90 GPIO引脚。我在想，有可能做一个可级联控制器。例如，如果我可以在MCU上调整4个楼层，然后让它与下一个（和以前）MCU的通信，每个MCU都能处理4层。这样，我可以使用40针MCU在控制箱多达所需的。它们都在UART端口上互相通信，它们可以按需要级联。如果这是可行的。你能给出一个关于固件的ALGO级设计吗？非常感谢你的帮助。
                    
                    
               
                                                                                      以下为原文

                                                                            Hello everyone

I am working to develop an Elevator controller that do not use any communication bus between the Elevator Cabin, Hall and Controller panel. Instead all call buttons and indication LEDs etc and reed switches from all floors are directly (or through relays etc) are connected on the GPIO pins. So a high number of pin counts is needed on the MCU. For example for a 12 floor elevator I estimated approx. 90 GPIO pins.

I was thinking that would it be possible to make a cascadable controller.. so for example if i could adjust 4 floors on a MCU and then make it communicate with next (and previous) MCU's each capable of handling 4 floors.. in this way i could use 40 pins MCUs in the Control box as many as needed.. all of them communicating with each other on UART port and they can be cascaded as many as required.

If this is something doable.. can you give an algo level design about the firmware?

Your help is highly appreciated.