if the text does not appear within the framebuffer, it is very likely that it is not drawn: For text drawing it is necessary that it is processed first (e.g. alignment and word wrapping) - then it will be drawn. Does your main loop contain the function EwProcessSignals()? If this is missing, the drawing of text cannot be done.
Furthermore: Do you have established a serial connection between you target and a terminal window on the PC in order to receive debug and error messages? Please post the output.
Thank you and best regards,