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NanoPi M4V2: SPI - SSD1351 1.5 Inch RGB OLED Display

TCB13

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TCB13

TCB13

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Hello,

 

I'm trying to find out how to use a 1.5 Inch RGB OLED Display that uses the SSD1351 IC on a NanoPi M4 however I don't seem to be able to turn on the SPI.

 

I used armbian-config to enable the gpio overlay:

  

[ ] dwc3-0-host
[ ] i2c7
[ ] i2c8
[*] pcie-gen2
[ ] rk3328-opp-1.4ghz
[ ] rk3328-opp-1.5ghz
[ ] rk3399-opp-2ghz
[ ] spi-jedec-nor
[*] spi-spidev
[ ] uart4
[ ] w1-gpio

 

And the SPI isn't showing up on /dev:

  

ls /dev/spi*
ls: cannot access '/dev/spi*': No such file or directory

 

Wasn't this enough to be able to use the SPI1 on this board?

 

SBC: NanoPi M4V2

System: 5.10.35-rockchip64 #21.05.1 SMP PREEMPT Fri May 7 13:53:11 UTC 2021 aarch64 GNU/Linux

Display: https://www.ebay.com/itm/203101646517

Datasheet: https://www.waveshare.com/w/upload/5/5b/1.5inch_RGB_OLED_Module_User_Manual_EN.pdf

 

Thank you.

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tparys

tparys

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Posted

So the M4V2 is a supported board. that the SPI isn't working is probably worth a post by itself in the Rockchip 3399 Subforum.

 

At a glance, I tried turning on the SPI on my M4V2 and didn't see any spidev devices pop up, but might need to pull out the serial console to see if u-boot is throwing any warnings about the overlay.

 

Taking a look at the overlay, I'm not sure it looks correct, as it looks like even if it applies the SPI channel is disabled.

  

        fragment@4 {
                target = <0xffffffff>;

                __overlay__ {
                        #address-cells = <0x01>;
                        #size-cells = <0x00>;

                        spidev {
                                compatible = "spidev";
                                status = "disabled";
                                reg = <0x00>;
                                spi-max-frequency = <0x989680>;
                        };
                };
        };

 

 

1
TCB13

TCB13

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Posted
7 hours ago, tparys said:

So the M4V2 is a supported board. that the SPI isn't working is probably worth a post by itself in the Rockchip 3399 Subforum.

 

At a glance, I tried turning on the SPI on my M4V2 and didn't see any spidev devices pop up, but might need to pull out the serial console to see if u-boot is throwing any warnings about the overlay.

 

Taking a look at the overlay, I'm not sure it looks correct, as it looks like even if it applies the SPI channel is disabled.

  


        fragment@4 {
                target = <0xffffffff>;

                __overlay__ {
                        #address-cells = <0x01>;
                        #size-cells = <0x00>;

                        spidev {
                                compatible = "spidev";
                                status = "disabled";
                                reg = <0x00>;
                                spi-max-frequency = <0x989680>;
                        };
                };
        };

 

 

 

Thank you for your feedback!

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TCB13

TCB13

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@piter75,

 

On 6/6/2021 at 9:21 AM, piter75 said:

@TCB13 I am a bit late to the party but I figured it may still be needed ;-)

 

spi-spidev is a special / dynamic overlay. Besides enabling it you need to also configure it and armbian-config cannot currently do that.

 

For configuration options have a look here:

https://github.com/armbian/build/blob/master/patch/kernel/archive/rockchip64-5.10/general-rockchip-overlays.patch#L98-L126

You can also consult the local README file located in: /boot/dtb/rockchip/overlay/README.rockchip-overlays

 

Your comment was crucial to fix my "issue". I enabled the overlay and then as described on the file edited `/boot/armbianEnv.txt` in order to include:

  

param_spidev_spi_bus=1
param_spidev_max_freq=100000000

 

Now the SPI shows up: 

~# ls -la /dev/spi*
crw------- 1 root root 153, 0 Sep 16 18:51 /dev/spidev1.0

 

Also passes the spidev_test (https://raw.githubusercontent.com/torvalds/linux/master/tools/spi/spidev_test.c) 

~# ./spidev_test
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)

 

(Had to adjust the path)

 

Thank you for the tip!


 

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TCB13

TCB13

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Now unfortunately luma-oled seems to be yet another problem. I wired up my LCD as:


MOSI > GPIO1_A7 > SPI1_RXD > M4 Pin 21   > LCD DIN Pin (blue)
SCK > GPIO1_B1 > SPI1_CLK > M4 Pin 23     > LCD CLK Pin (yellow)
CS > GPIO1_B2  > SPI1_CSn0 > M4 Pin 24    > LCD CS Pin (orange)

 

DC > GPIO1_A0(3V) > M4 Pin 7        >   LCD DC Pin (green)

RST > GPIO1_A1(3V) > M4 Pin 11    >   LCD RST Pin (white)

 

Display: https://www.ebay.com/itm/203101646517

Datasheet: https://www.waveshare.com/w/upload/5/5b/1.5inch_RGB_OLED_Module_User_Manual_EN.pdf

 

From my understanding I had to get GPIO1_A0 and GPIO1_A1 in the system so the lib could use them.

According to this https://hev.cc/2927.html GPIO mapping I tried:

  

ls -la /dev/spi*
crw------- 1 root root 153, 0 Sep 16 18:51 /dev/spidev1.0

echo 32 > /sys/class/gpio/export
echo 33 > /sys/class/gpio/export

ls -la /sys/class/gpio/
total 0
drwxr-xr-x  2 root root       0 Jan 18  2013 .
drwxr-xr-x 76 root root       0 Jan 18  2013 ..
--w--w----  1 root dialout 4096 Sep 16 20:51 export
lrwxrwxrwx  1 root root       0 Sep 16 20:50 gpio32 -> ../../devices/platform/pinctrl/gpiochip1/gpio/gpio32
lrwxrwxrwx  1 root root       0 Sep 16 20:50 gpio33 -> ../../devices/platform/pinctrl/gpiochip1/gpio/gpio33
lrwxrwxrwx  1 root root       0 Jan 18  2013 gpiochip0 -> ../../devices/platform/pinctrl/gpio/gpiochip0
lrwxrwxrwx  1 root root       0 Jan 18  2013 gpiochip128 -> ../../devices/platform/pinctrl/gpio/gpiochip128
lrwxrwxrwx  1 root root       0 Jan 18  2013 gpiochip32 -> ../../devices/platform/pinctrl/gpio/gpiochip32
lrwxrwxrwx  1 root root       0 Jan 18  2013 gpiochip64 -> ../../devices/platform/pinctrl/gpio/gpiochip64
lrwxrwxrwx  1 root root       0 Jan 18  2013 gpiochip96 -> ../../devices/platform/pinctrl/gpio/gpiochip96
--w--w----  1 root dialout 4096 Sep 16 19:19 unexport

 

Now I tried the luma-oled examples (running as root):

  

python3 3d_box.py --display ssd1351 --interface spi --spi-port 0 --spi-device 1 --gpio-reset 33 --gpio-data-command 32 --width 128 --height 128
usage: 3d_box.py >(....)
3d_box.py: error: GPIO access not available

 

I'm not even sure if this part "--gpio-reset 33 --gpio-data-command 32" is correct. I've tried both the virtual pin number and the hardware number without luck.

 

Also tried to install https://github.com/friendlyarm/RPi.GPIO_NP without much luck:

  

apt-get update
apt-get install python-dev
git clone https://github.com/friendlyarm/RPi.GPIO_NP
cd RPi.GPIO_NP
python3 setup.py install
python3 setup.py install

python3 luma.examples/examples/3d_box.py --display=ssd1351 --interface=spi --width=128 --height=128 --spi-bus-speed=16000000 --bgr --spi-device=1 --spi-port=0 --gpio-reset=33 --gpio-data-command=32 --gpio RPi.GPIO

Traceback (most recent call last):
(...)
RuntimeError: It is not NanoPi based board.


 

0
TCB13

TCB13

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Posted

Following my lack of knowledge of the subject I found out another GPIO implementation that seems to have mappings for the NanoPi M4 called OPi.GPIO.

 

Rewired the LCD, I was unsure about the GPIO pin I picked for the DC pin:

  

MOSI > GPIO1_A7 > SPI1_RXD > M4 Pin 21   > LCD DIN Pin (blue)
SCK > GPIO1_B1 > SPI1_CLK > M4 Pin 23     > LCD CLK Pin (yellow)
CS > GPIO1_B2  > SPI1_CSn0 > M4 Pin 24    > LCD CS Pin (orange)

RST > GPIO1_A1(3V) > M4 Pin 11    >   LCD RST Pin (white)
DC > GPIO1_A3(3V)  > M4 Pin 13        >   LCD DC Pin (green)

 

Installed and run the thing without much success:

  

pip3 install --upgrade OPi.GPIO

ls /dev/spi*
/dev/spidev1.0

python3 luma.examples/examples/3d_box.py  \
--display=ssd1351 \
--interface=spi \
--width=128 --height=128 \
--spi-bus-speed=16000000 \
--bgr \
--spi-device=1 --spi-port=0 \
--gpio-reset=35 \
--gpio-data-command=33 \
--gpio OPi.GPIO \
--gpio-mode nanopi.m4.BOARD

Traceback (most recent call last):
  File "luma.examples/examples/3d_box.py", line 129, in <module>
    device = get_device()
  File "/root/luma.examples/examples/demo_opts.py", line 61, in get_device
    device = cmdline.create_device(args)
  File "/usr/local/lib/python3.7/dist-packages/luma/core/cmdline.py", line 246, in create_device
    device = Device(serial_interface=interface(), **params)
  File "/usr/local/lib/python3.7/dist-packages/luma/core/cmdline.py", line 161, in spi
    gpio=self.gpio or GPIO)
  File "/usr/local/lib/python3.7/dist-packages/luma/core/interface/serial.py", line 299, in __init__
    bitbang.__init__(self, gpio, transfer_size, reset_hold_time, reset_release_time, DC=gpio_DC, RST=gpio_RST)
  File "/usr/local/lib/python3.7/dist-packages/luma/core/interface/serial.py", line 187, in __init__
    self._DC = self._configure(kwargs.get("DC"))
  File "/usr/local/lib/python3.7/dist-packages/luma/core/interface/serial.py", line 200, in _configure
    self._gpio.setup(pin, self._gpio.OUT)
  File "/usr/local/lib/python3.7/dist-packages/OPi/GPIO.py", line 470, in setup
    pin = get_gpio_pin(_mode, channel)
  File "/usr/local/lib/python3.7/dist-packages/OPi/pin_mappings.py", line 80, in get_gpio_pin
    return _pin_map[mode][channel]
KeyError: 33

 

From what I understand of https://github.com/rm-hull/OPi.GPIO/blob/master/nanopi/m4.py my physical pin 11 maps to GPIO 33 and physical pin 13 to GPIO 35. Is this even correct?

 

Either way it still fails.

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TCB13

TCB13

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 I finally managed to get this work. Things I was doing wrong:

  1. Not using the OPi.GPIO replacement library - others aren't compatible with the NanoPi M4;
  2. DIN LCD pin was connected to the SBC RXD instead of TXD;
  3. Passed wrong pin numbers to the libraries (should be the real physical pins numers);
  4. Mistaking SPI port with device...

Here the full guide on how to it properly. Start by installing:

  

apt-get install python3 python3-pip python3-pil libjpeg-dev zlib1g-dev libfreetype6-dev liblcms2-dev libopenjp2-7 libtiff5 -y
pip3 install luma.oled
apt-get remove python3-rpi.gpio rpi.gpio-common
pip3 install --upgrade OPi.GPIO

 

Wire up your LCD as:

  

MISO > GPIO1_B0 > SPI1_TXD > 19    > LCD DIN | Blue 
SCK > GPIO1_B1 > SPI1_CLK > 23     > LCD CLK | Yellow
CS > GPIO1_B2  > SPI1_CSn0 > 24    > LCD CS | Orange

RST > GPIO1_A1(3V) > M4 Pin 11     >  LCD RST Pin | White
DC > GPIO1_A3(3V)  > M4 Pin 13     >  LCD DC Pin | Green

 

Download an run an example:

  

git clone https://github.com/rm-hull/luma.examples.git

python3 luma.examples/examplebounce.py 
--display=ssd1351 \
--interface=spi \
--width=128 --height=128 \
--spi-bus-speed=50000000 \
--spi-device=0 \
--spi-port=1 \
--gpio-reset=11 \
--gpio-data-command=13 \
--gpio OPi.GPIO \
--gpio-mode nanopi.m4.BOARD

 

And you should get something like this:

 

nanopim4v2-ssd1351.jpg

 

It seems to be able to drive the display up to around 45fps without noises like I've experienced before in an Arduino.

 

Enjoy.

 

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