Comments (6)
rm-hull
commented on June 7, 2024
2
To be honest I would just source a different LCD board from ebay or aliexpress ... one where you wire it yourself
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rm-hull
commented on June 7, 2024
By default PCD8544 driver is SPI compatible, hence the reason it is fixed to use the RPIs SPI interface pins.. this allows us to use the SPI hardware and the Linux kernel to drive the device efficiently. If you have bought a board which interfaces those lines to non-SPI griot header pins, then that is a poor decision by the board designer!
The only choice you have really is therefore to do what is called bit-banging in software .. this is what
https://github.com/pevandenburie/node-pcd8544-rpi/blob/master/src/PCD8544.cc#L812 does.
Luma.lcd will support bitbanging but I haven’t tried it for a while. Instead of SPI, you would need to look at using this serial interface instead:
https://github.com/rm-hull/luma.core/blob/master/luma/core/interface/serial.py#L118
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duchenpaul
commented on June 7, 2024
Thank you for your quick reply! 😄
I tried bitbang in your core before, seems not working.
I will take another look when I have time.
Below is my pin config, I think it is correct
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duchenpaul
commented on June 7, 2024
Hi @rm-hull
Hope it is something wrong on my side, I used below code, but no luck, nothing shows on my screen
please checkout Front pic to see what front looks like.
from luma.core.interface.serial import spi, bitbang
from luma.core.render import canvas
from luma.lcd.device import pcd8544
# serial = spi(port=0, device=1, gpio_DC=27, gpio_RST=23)
serial = bitbang(SCLK=17, SDA=18, CE=22 , DC=27 ,RST=23)
device = pcd8544(serial, rotate=1)
with canvas(device) as draw:
draw.rectangle(device.bounding_box, outline="white", fill="black")
draw.text((30, 40), "Hello World", fill="red")Now that I won't use stock hardware SPI, I think below operation is meaningless, but I want to show you still
[ 22:22 - 192.168.2.107 ]
pi@Saturn ~/projects/PCD_8544_screen/python/test $ ls -l /dev/spi*
crw-rw---- 1 root spi 153, 0 Dec 5 23:19 /dev/spidev0.0
crw-rw---- 1 root spi 153, 1 Dec 5 23:19 /dev/spidev0.1
[ 22:23 - 192.168.2.107 ]
pi@Saturn ~/projects/PCD_8544_screen/python/test $ lsmod
Module Size Used by
cmac 3239 1
bnep 12051 2
hci_uart 20020 1
btbcm 7916 1 hci_uart
bluetooth 365780 24 hci_uart,bnep,btbcm
spidev 7373 0
brcmfmac 292632 0
brcmutil 9863 1 brcmfmac
cfg80211 544545 1 brcmfmac
rfkill 20851 6 bluetooth,cfg80211
snd_bcm2835 24427 0
snd_pcm 98501 1 snd_bcm2835
snd_timer 23968 1 snd_pcm
snd 70032 3 snd_timer,snd_bcm2835,snd_pcm
bcm2835_gpiomem 3940 0
spi_bcm2835 7596 0
uio_pdrv_genirq 3923 0
fixed 3285 0
uio 10204 1 uio_pdrv_genirq
i2c_dev 6913 0
ip_tables 13161 0
x_tables 20578 1 ip_tables
ipv6 408900 43
[ 22:23 - 192.168.2.107 ]
pi@Saturn ~/projects/PCD_8544_screen/python/test $
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thijstriemstra
commented on June 7, 2024
@duchenpaul got it to work?
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duchenpaul
commented on June 7, 2024
Yes, I will close it.
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Related Issues (20)
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