Pi 2 SPI MOSI outputting < 0.5v - Raspberry Pi Forums

-

i'm working on developing c# mono class library drive st7735r screen without using framebuffer kernel driver. working perfectly, stopped working broke out oscilloscope check going down spi interface. imagine amazement when see mosi outputting right data @ wrong voltage - below 0.5v rather 3.3v.

if drive mosi pin gpio, outputs 3.3v no problem @ all. mystifying me, since thought @ base level, pin bitbanged spi driver can't see why happen. i'm accessing gpio , spi subsystems using wrappers bcm2835 c library , have had gpio, spi , i2c working different devices , i've not changed hardware-related code.

there bizarre pull-down configuration pin being mismanaged somewhere causing problem? spi clock pin still reading solid 3.3v both in spi , gpio configurations. i'm not using 5v anywhere in hardware can't see have accidentally passed 5v down mosi pin in error, , if had caused damage of type, wouldn't see bad output in gpio mode?

[edit] way, on stock pi 2 running raspian (noobs current version) newest firmware. [/edit]

suggestions gratefully received!

thanks,
mike

just know i'm not going crazy, here 2 screencaps oscilloscope...one mosi , spiclk pins driven high , low gpio pins, , other of spi data being sent using bcm2835 functions wrapped in c#.


raspberrypi



Comments

Post a Comment

Popular posts from this blog

Connecting Raspberry Pi 2 to P10(1R)-V706 LED Dot Matrix - Raspberry Pi Forums

-
Image
hello everyone, name kedi.. make system connecting raspberry pi 2 , arduino uno arduino adc of 1 dust sensor sharp gp2y1010au0f , 4 gas sensor. want show decision of air quality system in running text @ p10 16x32 led dot matrix display. in raspberry pi 2, connect p10 pins in gpio25, gpio12, gpio16, gpio13 & gpio26. now, i'm finish circuit , don't know must connect p10's vcc & ground (red & black wire). can me? , code in python controlling p10(1r)-v706 dot matrix?.. regards, kedi i can't python code (did mine in basic on risc os) regarding power, panels each require 2.5a, you'll need separate supply them. if attempted power them pi, pi's polyfuse blow immediately. alternatively, use supply capable of giving 10a supply both panels , pi. raspberrypi
Read more

TypeError: <unknown> is not a numpy array - Raspberry Pi Forums

-
hi, thank help. question simple: how convert raspistill data opencv processing. code: select all def capture(settings, width, height): command = "raspistill %s -w %s -h %s -t 200 -e bmp -n -o -" % (settings, width, height) imagedata = stringio.stringio() imagedata.write(subprocess.check_output(command, shell=true)) imagedata.seek(0) im = image.open(imagedata) buffer = im.load() imagedata.close() return im,buffer code: select all image1, buffer1 = capture(camerasettings, testwidth, testheight) cv2.imshow('image',image1) want use different opencv processing techniques, before need know doing wrong. bests svato raspberrypi
Read more

datso and removing imagetitle - Joomla! Forum - community, help and support

-
hello everybody i have installed datso v. 1.3.8 , remove imagetitles http://www.galleri-kbh.dk/index.php?opt ... ry&catid=2 on datsos  homepage there no names, can't find function in parameters in administration?? http://www.datso.fr/datsogallery/viewcategory/2.html can me. vh jan found way it  :d delete line 307 "$tle = ereg_replace('"', '', $row1->imgtitle);" in file components/com_datsogallery/datsogallery.php Board index Joomla! Older Version Support Joomla! 1.0 Extensions - 1.0.x Components
Read more