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DiddyDevelopment

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  1. Hello, I try to setup my Orange Pi Lite with a thermal printer (http://www.ebay.de/itm/122418910118?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT). With my Arduino the printer works perfect, so it is actually ok. I just can't figure out how to use the ttl connection. I installed pyA20 and try to implement a kind of SoftwareSerial and it didn't worked really well: #!/usr/bin/env python """Basic blinking led example. The led on A20-OLinuXino-MICRO blinks with rate of 1Hz like "heartbeat". """ import os import sys import time if not os.getegid() == 0: sys.exit('Script must be run as root') from time import sleep from pyA20.gpio import gpio from pyA20.gpio import port from pyA20.gpio import connector tx = port.PA11 rx = port.PA12 baud = 1.0/9600.0 def sendTx(sendCharASCII): sendByte = '{0:b}'.format(sendCharASCII).zfill(8) sendByte = sendByte[::-1] print(sendByte) sendByteInt = [int(bit) for bit in sendByte] gpio.output(tx,0) time.sleep(baud) for bit in sendByteInt: #print('sending '+bit) gpio.output(tx,bit) time.sleep(baud) gpio.output(tx,1) time.sleep(0.01) gpio.init() gpio.setcfg(tx, gpio.OUTPUT) gpio.setcfg(rx, gpio.OUTPUT) gpio.output(tx,1) gpio.output(rx,0) sleep(1) sendTx(ord('a')) sendTx(ord('b')) sendTx(ord('c')) sendTx(ord('d')) sendTx(ord('e')) sendTx(ord('f')) sendTx(ord('g')) sendTx(ord('h')) sendTx(ord('i')) sendTx(ord('j')) sendTx(ord('k')) sendTx(ord('l')) sendTx(ord('m')) sendTx(ord('n')) sendTx(ord('o')) sendTx(ord('p')) sendTx(ord('q')) sendTx(ord('r')) sendTx(ord('s')) sendTx(ord('t')) sendTx(ord('u')) sendTx(ord('v')) sendTx(ord('w')) sendTx(ord('x')) sendTx(ord('y')) sendTx(ord('z')) sendTx(10) sendTx(10) sendTx(10) I printed out some cryptic signes. The cool thing is, that if i change the baud sleep time to something smaller, it actually prints sometimes the right letters. That means python is just too slow. Can anyone help to setup a ttl connection to the printer? I've googled alot, but I just can't find anything helpfull Currently I use pins PA11 and PA12, is this right? Greets, Chris
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