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README.txt
==========
This README.txt file discusses the port of NuttX to the Intel Galileo
board.
NOTE: There is no port for the Galileo in place as of this writing. At this
point in time, this README file is only a repository for pre-porting
information. It is not clear as of this writing whether there ever will
be a port to the Galileo development board or not.
LEDs and Buttons
================
Serial Console
==============
Serial Console
==============
Galileo provides two options for a Serial Console:
1) UART TTL (5V/3.3V) serial communication is available on Arduino
digital 0 (pin 1, IO0) and digital 1 (pin 2, IO1). The function of IO0
and IO1 are controlled via a TS5A23159 2-channel 2:
multiplexer/demultiplexer
--- ---- --------- -------------------------------------
PIN NAME SIGNAL DESCRIPTION
--- ---- --------- -------------------------------------
1 IN1 IO0_MUX Select NO1 or NC1 as IO on COM1 = IO0
2 NO1 LVL_RXD IN=L, IO0=RXD
3 NC1 IO0_GPIO IN=H, IO0=GPIO
--- ---- --------- -------------------------------------
5 IN2 IO1_MUX Select NO1 or NC1 as IO on COM2 = IO1
4 NO2 IO1_GPIO IN=L, IO1=GPIO
7 NC2 LVL_TXD IN=H, IO2=TXD
--- ---- --------- -------------------------------------
The LVL_RXD/LVL_TXD driver from UART0_TXD/UART0_RXD via a TXS0108E
voltage level translator that brings the which brings 1.2-3.6V signals
to 165-5.5V.
2) In addition, a second UART provides RS-232 support via a MAX3232 driver
and is connected via a 3.5mm jack: Sleeve = GND, RING=SERIAL1_RXD, and
TIP=SERIAL1_TXD.
UART1 may be convenient because of its built-in RS232 drivers. But if you
have a standard RS-232 shield, then UART0 may be the better choice.
Configurations
==============