2 replies to this topic

[w5uxh]

Can anyone point me to documentation that identifies the mapping between device names like COM1 and COM2 etc. and the I/O pins of the Netduino Plus 2?

 

I can see in the schematic that D2/D3 are related to the chip USART2, and D7/D8 are related to the chip USART4, but I would guess there must be some specific documentation somewhere that tells me which pins are defined for COM1 and COM2?

 

In the Tech Specs, I also see the mapping between internal USARTs but it does not seem to agree with the schematic.  The Tech Specs say D2/D3 is UART2 and D7/D8 is UART3 (not UART4).  Perhaps I am getting confused looking back and forth.  But in some sample code I have found it appears I need to use COM1 type names.  I could use the scope and try to write code to wiggle pins for COM1 or COM2 but I hope there is some helpful documentation available for such things.

 

I have tried to search the forum and used general google searches but have not found this type of documentation so far.

 

Perhaps there are header files that provide a guide to such things?  I am new to the .NET environment so I am sure there are many fundamental pointers I still need to learn about.

 

Thanks.

 

[CW2]

The USART numbers on Tech Specs page do not relate directly to the microcontroller USARTs, they should be probably listed as COMs instead.

COM  | Pins     | Microcontroller | Tech Specs-----+----------+-----------------+-----------COM1 |  D0, D1  | USART6          | UART 1COM2 |  D2, D3  | USART2          | UART 2COM3 |  D7, D8  | UART4           | UART 3COM4 | SDA, SCL | USART1          | UART 4

[w5uxh]

Thanks for the quick response.  I marked this as answered because it does answer the specific question about mapping from COM ports to I/O pins.  I still wonder if there is a set of documentation for things like this, that relate software to hardware.