Test on 3 type of ST7735 SPI LCD with STM32F411/CircuitPython 7.0.0:
-
1.44" 128x128 (KMR1441_SPI V2)
- 0.96" 80x160 IPS
- 1.8" 128x160 TFT
It's assumed CircuitPython 7.0.0 is installed on STM32F411 minimum development board, a STM32F411CE Black Pill-like board. To install CircuitPython firmware on STM32F411, refer to the post "Flash CircuitPython to STM32F411, and install Thonny IDE on Ubuntu 20.10".
Library
adafruit_st7735, adafruit_st7735r and adafruit_display_text are needed in the following exercises.
Visit https://circuitpython.org/libraries, download the appropriate bundle (adafruit-circuitpython-bundle-7.x-mpy- here) for your version of CircuitPython. Unzip the file, copy adafruit_st7735.mpy, adafruit_st7735r.mpy and adafruit_display_text folder from the "lib" folder to the "lib" folder on your CIRCUITPY drive. (refer to the video in last post "CircuitPython 7 exercises on STM32F411, with SSD1306 I2C OLED")
Please notice that 1.44" 128x128 (KMR1441_SPI V2) and 1.8" 128x160 TFT have
same pin assignment, 0.96" 80x160 IPS have different pin order and pin name
but same function.
The connection refer to the exercise code, marked blue.
Exercise code
The code in red show the difference between
them.
"""
CircuitPython 7 exercise run on STM32F411
with 128x128 SPI ST7735
ref:
adafruit/Adafruit_CircuitPython_ST7735
https://github.com/adafruit/Adafruit_CircuitPython_ST7735
adafruit/Adafruit_CircuitPython_ST7735R
https://github.com/adafruit/Adafruit_CircuitPython_ST7735R
"""
from sys import implementation as sysImplementation
import time
import board
import busio
import displayio
import terminalio
from adafruit_st7735 import ST7735 as TFT_ST7735
from adafruit_st7735 import __name__ as ST7735_NAME
from adafruit_st7735 import __version__ as ST7735_VERSION
from adafruit_display_text import label
# Release any resources currently in use for the displays
displayio.release_displays()
#Connection between STM32F411 and SPI ST7735 display
#marking on display #128x128 #80x160
tft_sck = board.B13 #SCK #SCL
tft_mosi = board.A1 #SDA #SDA
tft_dc = board.A2 #A0 #DC
tft_reset = board.A3 #RESET #RES
tft_cs = board.A4 #CS #CS
#Backlight (LED/BLK) connect to STM32F411 3V3
#TFT VCC - STM32F411 3V3
#TFT GND - STM32F411 GND
tft_spi = busio.SPI(clock=tft_sck, MOSI=tft_mosi)
display_bus = displayio.FourWire(
tft_spi, command=tft_dc, chip_select=tft_cs, reset=tft_reset
)
# I find out colrstart/rowstart by try/error and retry
display = TFT_ST7735(display_bus, width=128, height=128,
rotation=90,
)
print(type(display))
print("display.width: ", display.width)
print("display.height: ", display.height)
# Make the display context
splash = displayio.Group()
display.show(splash)
color_bitmap = displayio.Bitmap(display.width, display.height, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0x000000
time.sleep(1)
bg_sprite = displayio.TileGrid(color_bitmap,
pixel_shader=color_palette, x=0, y=0)
splash.append(bg_sprite)
for c in [["RED", 0xFF0000],
["GREEN", 0x00FF00],
["BLUE", 0x0000FF]]:
print(c[0], " : ", hex(c[1]))
color_palette[0] = c[1]
time.sleep(2)
splash.remove(bg_sprite)
#---
# Make the display context
#splash = displayio.Group()
#display.show(splash)
color_bitmap = displayio.Bitmap(display.width, display.height, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0x00FF00
bg_sprite = displayio.TileGrid(color_bitmap,
pixel_shader=color_palette, x=0, y=0)
splash.append(bg_sprite)
# Draw a smaller inner rectangle
inner_bitmap = displayio.Bitmap(display.width-2, display.height-2, 1)
inner_palette = displayio.Palette(1)
inner_palette[0] = 0x0000FF
inner_sprite = displayio.TileGrid(inner_bitmap,
pixel_shader=inner_palette, x=1, y=1)
splash.append(inner_sprite)
# Draw a label
text_group1 = displayio.Group(scale=1, x=5, y=10)
text1 = "STM32F411"
text_area1 = label.Label(terminalio.FONT, text=text1, color=0xFF0000)
text_group1.append(text_area1) # Subgroup for text scaling
# Draw a label
strSys = sysImplementation[0] + ' ' + \
str(sysImplementation[1][0]) +'.'+ \
str(sysImplementation[1][1]) +'.'+ \
str(sysImplementation[1][2])
text_group2 = displayio.Group(scale=1, x=5, y=25)
text2 = strSys
text_area2 = label.Label(terminalio.FONT, text=text2, color=0xFFFFFF)
text_group2.append(text_area2) # Subgroup for text scaling
# Draw a label
text_group3 = displayio.Group(scale=1, x=5, y=40)
text3 = ST7735_NAME
text_area3 = label.Label(terminalio.FONT, text=text3, color=0x0000000)
text_group3.append(text_area3) # Subgroup for text scaling
# Draw a label
text_group4 = displayio.Group(scale=1, x=5, y=55)
text4 = ST7735_VERSION
text_area4 = label.Label(terminalio.FONT, text=text4, color=0x000000)
text_group4.append(text_area4) # Subgroup for text scaling
text_group5 = displayio.Group(scale=1, x=5, y=70)
text5 = str(display.width) + " x " + str(display.height)
text_area5 = label.Label(terminalio.FONT, text=text5, color=0x000000)
text_group5.append(text_area5) # Subgroup for text scaling
splash.append(text_group1)
splash.append(text_group2)
splash.append(text_group3)
splash.append(text_group4)
splash.append(text_group5)
time.sleep(3.0)
rot = 90
while True:
time.sleep(5.0)
rot = rot + 90
if (rot>=360):
rot =0
display.rotation = rot
cpyF411_st7735_80x160.py for 0.96" 80x160 IPS
"""
CircuitPython 7 exercise run on STM32F411
with 80x160 SPI ST7735 IPS
ref:
adafruit/Adafruit_CircuitPython_ST7735
https://github.com/adafruit/Adafruit_CircuitPython_ST7735
adafruit/Adafruit_CircuitPython_ST7735R
https://github.com/adafruit/Adafruit_CircuitPython_ST7735R
"""
from sys import implementation as sysImplementation
import time
import board
import busio
import displayio
import terminalio
from adafruit_st7735r import ST7735R as TFT_ST7735
from adafruit_st7735r import __name__ as ST7735_NAME
from adafruit_st7735r import __version__ as ST7735_VERSION
from adafruit_display_text import label
# Release any resources currently in use for the displays
displayio.release_displays()
#Connection between STM32F411 and SPI ST7735 display
#marking on display #128x128 #80x160
tft_sck = board.B13 #SCK #SCL
tft_mosi = board.A1 #SDA #SDA
tft_dc = board.A2 #A0 #DC
tft_reset = board.A3 #RESET #RES
tft_cs = board.A4 #CS #CS
#Backlight (LED/BLK) connect to STM32F411 3V3
#TFT VCC - STM32F411 3V3
#TFT GND - STM32F411 GND
tft_spi = busio.SPI(clock=tft_sck, MOSI=tft_mosi)
display_bus = displayio.FourWire(
tft_spi, command=tft_dc, chip_select=tft_cs, reset=tft_reset
)
# I find out colrstart/rowstart by try/error and retry
display = TFT_ST7735(display_bus, width=160, height=80,
colstart=26, rowstart=1,
rotation=90,
invert=True
)
print(type(display))
print("display.width: ", display.width)
print("display.height: ", display.height)
[... same as in cpyF411_st7735_128x128.py ...]
cpyF411_st7735_128x160.py for 1.8" 128x160 TFT
"""
CircuitPython 7 exercise run on STM32F411
with 128x160 SPI ST7735
ref:
adafruit/Adafruit_CircuitPython_ST7735
https://github.com/adafruit/Adafruit_CircuitPython_ST7735
adafruit/Adafruit_CircuitPython_ST7735R
https://github.com/adafruit/Adafruit_CircuitPython_ST7735R
"""
from sys import implementation as sysImplementation
import time
import board
import busio
import displayio
import terminalio
from adafruit_st7735r import ST7735R as TFT_ST7735
from adafruit_st7735r import __name__ as ST7735_NAME
from adafruit_st7735r import __version__ as ST7735_VERSION
from adafruit_display_text import label
# Release any resources currently in use for the displays
displayio.release_displays()
#Connection between STM32F411 and SPI ST7735 display
#marking on display #128x128 #80x160
#128x160
tft_sck = board.B13 #SCK #SCL
tft_mosi = board.A1 #SDA #SDA
tft_dc = board.A2 #A0 #DC
tft_reset = board.A3 #RESET #RES
tft_cs = board.A4 #CS #CS
#Backlight (LED/BLK) connect to STM32F411 3V3
#TFT VCC - STM32F411 3V3
#TFT GND - STM32F411 GND
tft_spi = busio.SPI(clock=tft_sck, MOSI=tft_mosi)
display_bus = displayio.FourWire(
tft_spi, command=tft_dc, chip_select=tft_cs, reset=tft_reset
)
# I find out colrstart/rowstart by try/error and retry
display = TFT_ST7735(display_bus, width=160, height=128,
rotation=90,
)
print(type(display))
print("display.width: ", display.width)
print("display.height: ", display.height)
[... same as in cpyF411_st7735_128x128.py ...]
Remark@2021-10-15
Fix color order
Noted that the color order (RED/GREEN/BLUE shown in the video) is in-correct. To fix it:
- Use adafruit_st7735r library.
- add the parameter bgr=True when you create display object.
it's fixed in next exercise to read SD Card, load bitmap and display on ST7735 LCD.
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