The sst7789 driver library has a method to display pictures in jpg format, which is very friendly to us who are learning for the first time.
¶ jpg method
jpg(jpg_filename, x, y)
Draws a JPG file at the given x and y coordinates, which are the upper left corner of the image.
This method requires an additional 3100 bytes of memory for its working buffer.
¶ Prepare jpg files of appropriate size
Choose any picture you like, and crop it to a picture with a length of 320 pixels and a width of 170 pixels, or a picture smaller than this size.
There are a large number of optional picture editing tools in various smart terminal devices and various operating systems, and you can use your favorite tools for editing.
Here is a random web online image editing tool that can be used for free, Pixlr X.
Put the cropped picture into our local MicroPython working folder, rename it to pic_1.jpg, and refer to the method of uploading the picture to the MicroPython device, How to use VScode + mpbridge tool.
A cropped image is prepared here.
¶ jpg method use case
Use the jpg method in the main.py script.
""" BPI-Centi-S3 170x320 ST7789 display """
import st7789
import tft_config
import gc
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
tft.jpg("pic_1.jpg", 0, 0)
tft. show()
gc. collect()
except BaseException as err:
err_type = err.__class__.__name__
print('Err type:', err_type)
from sys import print_exception
print_exception(err)
finally:
tft.deinit()
print("tft deinit")
main()After uploading main.py, reset the device and you can see the picture on the screen.
Let’s prepare a few more jpg files of appropriate size, and then we can design a loop, and play the pictures on the screen of BPI-Centi-S3 in a loop like a slide show.
""" BPI-Centi-S3 170x320 ST7789 display """
import st7789
import tft_config
import gc
import time
pic_list = ["pic_1.jpg", "pic_2.jpg", "pic_3.jpg", "pic_4.jpg", "pic_5.jpg"]
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
while True:
for pic in pic_list:
tft.jpg(pic, 0, 0)
tft.show()
gc.collect()
time.sleep(1)
except BaseException as err:
err_type = err.__class__.__name__
print('Err type:', err_type)
from sys import print_exception
print_exception(err)
finally:
tft.deinit()
print("tft deinit")
main()