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如何使用 Display_printf 打印日誌

您好, 我是使用 ble5_simple_central_cc2640r2lp_app 這個 SDK,

因為它有一個按鍵的 menu, 我必需用它來和 BLE 的 peripheral . 

我己經設定 BOARD_DISPLAY_USE_UART_ANSI = 0 但並沒有用.

請問, 要怎麼做才能使用打印日誌, (一行接一行), 如此才能 進而了解程式流程和錯,

謝謝.