I have the same problem as this person: SPI enabled in device tree, but I can't use it
I tried commenting in the original thread but the community rules don't allow me to comment because I don't have 50 reputation points. The approved answer doesn't solve my problem.
I've verified the pin is correct and I can light an LED by setting it high. This is true for both SCLK (pin 23, GPIO11) and MOSI (pin 19, GPIO10). I'm trying to drive some Adafruit DotStar LED's. If I don't set the pins high or low, SCLK stays low, and MOSI stays high. SCLK should be emitting a stream of 1's and 0's so it should cause and LED to flicker, but it doesn't. I've been able to make everything work with an Adafruit Feather M0, and these tests worked with that device, so it should be the same with the pi.
I don't have a logic analyzer or oscilloscope.
Module Size Used by cmac 3134 1 bnep 11949 2 hci_uart 21222 1 btbcm 7917 1 hci_uart bluetooth 376017 24 hci_uart,bnep,btbcm spidev 7034 2 brcmfmac 269955 0 brcmutil 9911 1 brcmfmac cfg80211 527260 1 brcmfmac rfkill 21373 6 bluetooth,cfg80211 snd_bcm2835 23131 0 snd_pcm 97889 1 snd_bcm2835 snd_timer 22706 1 snd_pcm snd 68784 3 snd_timer,snd_bcm2835,snd_pcm i2c_bcm2835 6433 0 spi_bcm2835 7424 0 bcm2835_gpiomem 3791 0 uio_pdrv_genirq 3718 0 uio 10166 1 uio_pdrv_genirq fixed 3029 0 i2c_dev 6642 0 i2c_bcm2708 5740 0 ip_tables 12512 0 x_tables 20921 1 ip_tables ipv6 384901 20
# For more options and information see # http://rpf.io/configtxt # Some settings may impact device functionality. See link above for details # uncomment if you get no picture on HDMI for a default "safe" mode #hdmi_safe=1 # uncomment this if your display has a black border of unused pixels visible # and your display can output without overscan #disable_overscan=1 # uncomment the following to adjust overscan. Use positive numbers if console # goes off screen, and negative if there is too much border #overscan_left=16 #overscan_right=16 #overscan_top=16 #overscan_bottom=16 # uncomment to force a console size. By default it will be display's size minus # overscan. #framebuffer_width=1280 #framebuffer_height=720 # uncomment if hdmi display is not detected and composite is being output #hdmi_force_hotplug=1 # uncomment to force a specific HDMI mode (this will force VGA) #hdmi_group=1 #hdmi_mode=1 # uncomment to force a HDMI mode rather than DVI. This can make audio work in # DMT (computer monitor) modes #hdmi_drive=2 # uncomment to increase signal to HDMI, if you have interference, blanking, or # no display #config_hdmi_boost=4 # uncomment for composite PAL #sdtv_mode=2 #uncomment to overclock the arm. 700 MHz is the default. #arm_freq=800 # Uncomment some or all of these to enable the optional hardware interfaces #dtparam=i2c_arm=on #dtparam=i2s=on dtparam=spi=on dtoverlay=spi0-hw-cs # Uncomment this to enable the lirc-rpi module #dtoverlay=lirc-rpi # Additional overlays and parameters are documented /boot/overlays/README # Enable audio (loads snd_bcm2835) dtparam=audio=on # Enable UART enable_uart=1 dtparam=i2c_arm=on dtparam=i2c=on dtparam=i2c_arm_baudrate=100000
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)" NAME="Raspbian GNU/Linux" VERSION_ID="9" VERSION="9 (stretch)" ID=raspbian ID_LIKE=debian HOME_URL="http://www.raspbian.org/" SUPPORT_URL="http://www.raspbian.org/RaspbianForums" BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
I haven't yet tried running an older version of raspbian, that's what I'm starting on now. If that doesn't work, then I'm out of ideas.
Please help. Need to get this working ASAP.