dietpi@DietPi:~$ sudo modinfo spi_rockchip
name: spi_rockchip
filename: (builtin)
license: GPL v2
file: drivers/spi/spi-rockchip
description: ROCKCHIP SPI Controller Driver
author: Addy Ke <addy.ke@rock-chips.com>
dietpi@DietPi:~$ zgrep SPI_ROCKCHIP /proc/config.gz
CONFIG_SPI_ROCKCHIP=y
CONFIG_SPI_ROCKCHIP_MISCDEV=y
CONFIG_SPI_ROCKCHIP_SFC=y
dietpi@DietPi:~$ dmesg | grep -i spi
[ 8.603208] GICv3: 320 SPIs implemented
[ 8.603217] GICv3: 0 Extended SPIs implemented
[ 11.685782] rockchip-spi fe630000.spi: register misc device rkspi-dev2
[ 11.685856] rockchip-spi fe630000.spi: probed, poll=0, rsd=0, cs-inactive=0, ready=0
[ 11.689022] rockchip-spi fe640000.spi: register misc device rkspi-dev3
[ 11.689095] rockchip-spi fe640000.spi: probed, poll=0, rsd=0, cs-inactive=0, ready=0
dietpi@DietPi:~$ ls /dev/spidev*
/dev/spidev3.0
I have enabled SPI3 and attempted to connect the ST7735S display using the Adafruit-Blinka, Adafruit-PlatformDetect, and adafruit-circuitpython-st7735r libraries to display an image.
However, the screen remains completely white and does not show any activity. Can you help identify the issue?
st7735s example code (Introduction — Adafruit ST7735R Library 1.0 documentation)
import board
import displayio
import fourwire
from adafruit_st7735r import ST7735R
spi = board.SPI()
tft_cs = board.D5
tft_dc = board.D6
displayio.release_displays()
display_bus = fourwire.FourWire(spi, command=tft_dc, chip_select=tft_cs, reset=board.D9)
display = ST7735R(display_bus, width=128, height=128, colstart=2, rowstart=1)
# Make the display context
splash = displayio.Group()
color_bitmap = displayio.Bitmap(128, 128, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0xFF0000
bg_sprite = displayio.TileGrid(color_bitmap,
pixel_shader=color_palette,
x=0, y=0)
splash.append(bg_sprite)
while True:
pass