I am using Beagle Board black. I want to use RS485 by UART4 to read data from modbus resister.
currently i am using "BB-UART4-RS485-00A0.dtbo" for reference i put schemettic photo .
RS485_TX → p9.13
GPIO_48_RS485_EN → p9.27
i think pin configration is proper.
problem :- As i need to send data “GPIO_48_RS485_EN” should be high , and to receive data it should low . Making High and Low that task need to handle by kernal automatically but it not do automatically i want that making high/low this task should be handle by kernal . i want solution for this .
By making menual high/low by user data is send and received proparly that i checked.(That mean hardware ckt is working proparly)
Any one have solution than please provide me.