SPI Touchscreen Support
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Jan Bernrader
New Member Posts: 6 ✭
I was wondering if anyone managed to successfully interfaced a Touchscreen like this one (The touch input)(https://www.waveshare.com/wiki/4inch_HDMI_LCD) over the SPI Pins.
So far i have successfully installed the ads7846_device module (as far as I can tell) and the irqs are correctly registered in /proc/interrupts , but there is no reaction what so ever like pointer movements etc.
Here are some of the used commands:
This is the Output of dmesg | grep spi
And of dmesg | grep ads:
And of lsmod | grep spi:
Help would be very much appreciated thanks in advance!
So far i have successfully installed the ads7846_device module (as far as I can tell) and the irqs are correctly registered in /proc/interrupts , but there is no reaction what so ever like pointer movements etc.
Here are some of the used commands:
modprobe -v -i ads7846_device model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=2 verbose=2
This is the Output of dmesg | grep spi
[ 0.000000] ACPI: SSDT ACPI table found in initrd [kernel/firmware/acpi/spidev1.1.aml][0xb6] [ 0.000000] ACPI: SSDT ACPI table found in initrd [kernel/firmware/acpi/spidev1.0.aml][0xb6] [ 6.045943] spidev spi-SPT0001:00: do not use this driver in production systems! [ 6.046200] spidev spi-SPT0001:01: do not use this driver in production systems! [ 38.729091] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 38.729095] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 38.729371] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 38.729374] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 38.729377] ads7846_device: ads7846 spi2.1 50kHz 8 bits mode=0x00 [ 38.735587] ads7846 spi2.1: touchscreen, irq 245 [ 38.758222] input: ADS7846 Touchscreen as /devices/pci0000:00/0000:00:19.1/pxa2xx-spi.12/spi_master/spi2/spi2.1/input/input7
And of dmesg | grep ads:
[ 38.727276] ads7846_device: loading out-of-tree module taints kernel.
ads7846_device: ads7846_device_init()
[ 38.729081] ads7846_device: SPI devices registered:
[ 38.729091] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00
[ 38.729095] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00
[ 38.729096] ads7846_device:
[ 38.729102] ads7846_device: Settings:
[ 38.729104] ads7846_device: model = 7846
[ 38.729105] ads7846_device: gpio_pendown = 402
[ 38.729107] ads7846_device: swap_xy = 1
[ 38.729109] ads7846_device: x_min = 200
[ 38.729110] ads7846_device: x_max = 3900
[ 38.729112] ads7846_device: y_min = 200
[ 38.729114] ads7846_device: y_max = 3900
[ 38.729115] ads7846_device: x_plate_ohms = 150
[ 38.729117] ads7846_device: pressure_min = 0
[ 38.729119] ads7846_device: pressure_max = 255
[ 38.729120] ads7846_device: keep_vref_on = 0
[ 38.729122] ads7846_device: vref_delay_usecs = 0
[ 38.729124] ads7846_device: vref_mv = 0
[ 38.729125] ads7846_device: settle_delay_usecs = 0
[ 38.729127] ads7846_device: penirq_recheck_delay_usecs = 0
[ 38.729129] ads7846_device: y_plate_ohms = 0
[ 38.729130] ads7846_device: debounce_max = 0
[ 38.729132] ads7846_device: debounce_tol = 0
[ 38.729134] ads7846_device: debounce_rep = 0
[ 38.729367] ads7846_device: SPI devices registered:
[ 38.729371] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00
[ 38.729374] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00
[ 38.729377] ads7846_device: ads7846 spi2.1 50kHz 8 bits mode=0x00
[ 38.729379] ads7846_device:
[ 38.735587] ads7846 spi2.1: touchscreen, irq 245
And of lsmod | grep spi:
spi_pxa2xx_platform 24576 0 spidev 20480 0
Help would be very much appreciated thanks in advance!
Comments
-
You're trying to use SPI-bus 2, but only SPI-bus 0 (spidev 1) is brought out on the 40-pin GPIO-header -- https://up-community.org/wiki/Pinout_UP2 Changing busnum to 0 should fix it.
-
Hi WereCatf,
I tried that, but it throws an error, when using busnum=1 or busnum=0:root@portable:~# modprobe -v -i ads7846_device model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=1 verbose=2 insmod /lib/modules/4.9.18-ubilinux+/kernel/drivers/spi/ads7846_device.ko model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=1 verbose=2 modprobe: ERROR: could not insert 'ads7846_device': Operation not permitted
root@portable:~# modprobe -v -i ads7846_device model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=0 verbose=2 insmod /lib/modules/4.9.18-ubilinux+/kernel/drivers/spi/ads7846_device.ko model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=0 verbose=2 modprobe: ERROR: could not insert 'ads7846_device': Invalid argument
root@portable:~# dmesg | grep spi [ 0.000000] ACPI: SSDT ACPI table found in initrd [kernel/firmware/acpi/spidev1.1.aml][0xb6] [ 0.000000] ACPI: SSDT ACPI table found in initrd [kernel/firmware/acpi/spidev1.0.aml][0xb6] [ 4.838278] spidev spi-SPT0001:00: do not use this driver in production systems! [ 4.838517] spidev spi-SPT0001:01: do not use this driver in production systems! [ 156.587845] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 156.587850] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 156.587910] pxa2xx-spi pxa2xx-spi.11: chipselect 1 already in use [ 156.594804] ads7846_device: spi_new_device() returned NULL [ 403.439774] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 403.439778] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 403.439822] ads7846_device: spi_busnum_to_master(0) returned NULL.
root@portable:~# dmesg | grep ads [ 156.586111] ads7846_device: loading out-of-tree module taints kernel. ads7846_device: ads7846_device_init() [ 156.587838] ads7846_device: SPI devices registered: [ 156.587845] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 156.587850] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 156.587851] ads7846_device: [ 156.587857] ads7846_device: Settings: [ 156.587859] ads7846_device: model = 7846 [ 156.587860] ads7846_device: gpio_pendown = 402 [ 156.587862] ads7846_device: swap_xy = 1 [ 156.587864] ads7846_device: x_min = 200 [ 156.587865] ads7846_device: x_max = 3900 [ 156.587867] ads7846_device: y_min = 200 [ 156.587869] ads7846_device: y_max = 3900 [ 156.587870] ads7846_device: x_plate_ohms = 150 [ 156.587872] ads7846_device: pressure_min = 0 [ 156.587874] ads7846_device: pressure_max = 255 [ 156.587875] ads7846_device: keep_vref_on = 0 [ 156.587877] ads7846_device: vref_delay_usecs = 0 [ 156.587879] ads7846_device: vref_mv = 0 [ 156.587880] ads7846_device: settle_delay_usecs = 0 [ 156.587882] ads7846_device: penirq_recheck_delay_usecs = 0 [ 156.587884] ads7846_device: y_plate_ohms = 0 [ 156.587885] ads7846_device: debounce_max = 0 [ 156.587887] ads7846_device: debounce_tol = 0 [ 156.587888] ads7846_device: debounce_rep = 0 [ 156.594804] ads7846_device: spi_new_device() returned NULL ads7846_device: ads7846_device_init() [ 403.439766] ads7846_device: SPI devices registered: [ 403.439774] ads7846_device: SPT0001 spi-SPT0001:00 1000kHz 8 bits mode=0x00 [ 403.439778] ads7846_device: SPT0001 spi-SPT0001:01 1000kHz 8 bits mode=0x00 [ 403.439780] ads7846_device: [ 403.439784] ads7846_device: Settings: [ 403.439786] ads7846_device: model = 7846 [ 403.439788] ads7846_device: gpio_pendown = 402 [ 403.439790] ads7846_device: swap_xy = 1 [ 403.439792] ads7846_device: x_min = 200 [ 403.439793] ads7846_device: x_max = 3900 [ 403.439795] ads7846_device: y_min = 200 [ 403.439797] ads7846_device: y_max = 3900 [ 403.439798] ads7846_device: x_plate_ohms = 150 [ 403.439800] ads7846_device: pressure_min = 0 [ 403.439802] ads7846_device: pressure_max = 255 [ 403.439803] ads7846_device: keep_vref_on = 0 [ 403.439805] ads7846_device: vref_delay_usecs = 0 [ 403.439806] ads7846_device: vref_mv = 0 [ 403.439808] ads7846_device: settle_delay_usecs = 0 [ 403.439810] ads7846_device: penirq_recheck_delay_usecs = 0 [ 403.439812] ads7846_device: y_plate_ohms = 0 [ 403.439813] ads7846_device: debounce_max = 0 [ 403.439815] ads7846_device: debounce_tol = 0 [ 403.439816] ads7846_device: debounce_rep = 0 [ 403.439822] ads7846_device: spi_busnum_to_master(0) returned NULL. -
Okay, I finally got around to checking this on my own board and the problem is: the spi-enable - script has already claimed that cs-pin you're trying to use. You have to delete the file /lib/firmware/acpi-upgrades/spidev1.0.aml if you want to use cs0, or /lib/firmware/acpi-upgrades/spidev1.1.aml if you want to use cs1, and run
sudo update-initramfs -u -k all
to update the initramfs, followed by a reboot. After that you should be able to use SPI-bus 1, ie.sudo modprobe -v -i ads7846_device model=7846 cs=1 gpio_pendown=402 speed=50000 keep_vref_on=0 swap_xy=1 pressure_max=255 x_plate_ohms=150 x_min=200 x_max=3900 y_min=200 y_max=3900 busnum=1 verbose=2
PS. Your kernel is also outdated. The current Ubilinux-one is 4.9.45. -
That worked perfectly! Thanks a lot
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