[ay2b]

Originally Posted by tseres

i have a more general question...how can i write and send a text command to the built in TTL port on the rc? without going into detail, a GPS reciever using the standard NMEA protocol accepts TTL ASCII text strings as commands, and sends the serial amswers back...how would i go about reading and writing from the TTL port like this, or at least use a digital pin to do this?

This depends on your code. If you are using Kevin's serial_port.c/h library, then the instructions are in the file. Basically make sure you have ENABLE_SERIAL_PORT_TWO_TX defined for writing and ENABLE_SERIAL_PORT_TWO_RX defined for reading, and have the appropriate baud rate set. Then you set the global variable "stdout_serial_port" to the value of "SERIAL_PORT_TWO". After that, any printf() will go to the TTL line instead of the debug line. Please note, however, that it's possible I'm getting ports ONE and TWO mixed up.