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Configurare Raspberry Pi pentru utilizarea interfetei seriale
- 08 Octombrie 2012
- , autor Ovidiu Vatafu
Descarca pyserial-2.6.tar.gz de aici pypi.python.org/pypi/pyserial, dezarhiveaza-l si instaleaza-l:
wget http://pypi.python.org/packages/source/p/pyserial/pyserial-2.6.tar.gz tar -zxvf pyserial-2.6.tar.gz cd pyserial/pyserial-2.6 sudo python setup.py install
Editeaza fisierul de configurare /boot/cmdline.txt: sudo nano /boot/cmdline.txtsi eliminia urmatoarele linii:
console=ttyAMA0,115200 kgdboc =ttyAMA0,115200
Editeaza fisierul /etc/inittab sudo nano /etc/inittabsi elimina urmatoarea linie:
#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
Exemplu de utilizare port serial pe Raspberry Pi in Python
import serial
serialPort = serial.Serial(port="/dev/ttyAMA0", baudrate=115200, timeout=0.5, rtscts=False, dsrdtr=False, xonxoff=False, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE)
if not serialPort.isOpen():
serialPort.open()
#write to serial port
serialPort.write(txdatabuffer)
serialPort.flush()
#read from serial port
while serialPort.inWaiting()>0:
#inWaiting() returns characters in receive buffer
rxdatabuffer += serialPort.read([receivebytescount])
#if receivebytescount missing, will read until EOF
#alternatively you can use readline()
serialPort.readline()
rxdatabuffer = rxdatabuffer.decode( "UTF-8" )
serialPort.close()
Nota: ai nevoie de un transceiver de nivel (ex. SP3223), de la 3.3V acceptat de pinii GPIO ai lui Rapsberry Pi la nivel +12V ("0" logic") / -12V ("1" logic) conform standardului RS-232
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