Hi, I encounter the same problem as you and i would like know if you had returns or if you had to find the solution to send more than 8 bits with this library ?
thank you and good day Clément Le lundi 4 août 2014 00:36:16 UTC+2, [email protected] a écrit : > > Hello everybody, > > I am not sure if this is the correct place to post my problem. I am very > new to the > Beaglebone and embedded systems under Linux. > > I am currently trying to get a 16bit ADC running via SPI1 on my Beaglebone > Black. > My OS is Debian Wheezy with the 3.8.13 kernel. So far I have disabled the > HDMI > interface and got the spidev1.0 and spidev1.1 running. (Aside from my > actual > problem I am not sure what the last number represents.) > > I have shot wired the P9_29 and P9_30 pins to test the communication. My > program is written > in Python 2.7 and I am using the Adafruit_BBIO modul to control the SPI > (https://github.com/adafruit/adafruit-beaglebone-io-python). The SPI > part of this module > seems to derive from the spidev module (http://tightdev.net/SpiDev_Doc.pdf > ). > > When trying to send and receive one 16-bit word with the following code: > > import Adafruit_BBIO.SPI as SPI > print "Testing SPI: P9_29 and P9_30 need to be short wired" > spi = SPI.SPI() > spi.open(1,0) > spi.bpw = 16 > print "Word length is : " + str(spi.bpw) > resp = spi.xfer([0x1234]) # transfer one word of two bytes length > print "Sending 0x1234 via xfer - receiving: " + str(resp) > spi.close() #close the port before exit > > I only receive 8 bit, being the 8 LBS "34". The same goes for the xfer2 > method. > > Does somebody have any experience with this type of problem, or am I > missing something obvious? > Any help would be appreciated! > > Best Regards, > Bumin > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
