OLIMEX© 2015
iMX233-OLinuXino-NANO user's manual
CHAPTER 6 CONNECTORS AND PINOUT
6. Introduction to the chapter
In this chapter are presented the connectors that can be found on the board all together with their
pinout and notes about them. Jumpers functions are described. Notes and info on specific
peripherals are presented. Notes regarding the interfaces are given.
6.1 Debugging interfaces
There are two debugging options available on the OLinuXino – U_DEBUG and JTAG.
The U_DEBUG is the main way of interacting with the NANO and the operating system. The JTAG
is suitable for bare board programming but there is multiplexing with the SD card.
If you use a JTAG to program the board, you won't be able to use the SD card.
6.1.1 U_DEBUG
The first one is a debug UART interface – U_DEBUG. You can use our USB-SERIAL-CABLE-F
for debugging via the UART. Of course, if you already have a similar cable you can use it without
problems.
If your computer has an RS232 (COM) port you might use it for debug connection also (as long as
you bring its TTL levels down to CMOS). The important part is that you need a TTL ↔ CMOS
converter (MAX232 IC) on the RS232 signals else you might damage the board. Cables like USB-
SERIAL-CABLE-F have such a converter already.
How to use the U_DEBUG with USB-SERIAL-CABLE-F – which has
RED GREEN BLUE
wires GND=BLUE, RX(INPUT)=GREEN, TX(OUTPUT)=RED.
Y
ou have to connect to
OLinuXino-NANO U_DEBUG connector in this sequence:
BLUE wire to pin.3 (GND)
GREEN wire to pin.2 (TX)
RED wire to pin.1 (RX)
The settings for serial communication are: 115200, 8-N-1, no flow control.
U_DEBUG
Pin # Signal name
Processor pin #
1
PWM0/DUART_RXD
125
2
PWM1/DUART_TXD
126
3
GND
-
4
DEBUG
89
Page 18 of 36
