i need an RS485 interface with the IGEP COM MODULE board.
i will use an UART from the IGEP COM MODULE and a RS485 transceiver on the expansion board.
How can i manage the DE and RE signals of a standard RS485 transceiver with the COM module ? GPIO ?
You have two solutions, the first one is use a hardware trick that inverts the UART RTS signal connected to the DE/RE (for example using a transistor). The second is drive manualy this pin, i that case as example you can download the schematics of IGEP BERLIN and use the same solution. Via software, if you use the ISEE kernel, you can configure the UART in mode RS485. See