I use SPI connection according to the table. I want to press the button 4 on tx (P.06) to transfer "hello", to write down the answer of rx(P.08) in the file on sd card in one file. How to make it? it is desirable with an example. I work with an example ble_app_uart. SDK 13. What to begin with? I only wires have connected through SPI and all.
