OLED display driver

dcexpert

OLED display driver [Copy link]

 

 

Improved the OLED driver to support multiple fonts. Currently supports:

• 6x8
• 8x16
• 12x24
• 16x32

Drivers:

游客，如果您要查看本帖隐藏内容请回复

This content is originally created by dcexpert , a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

dcexpert

Demo

from machine import I2C, Pin
from oled import OLED12864_I2C

i2c = I2C(-1, scl = Pin(27, pull = Pin.PULL_UP), sda = Pin(13, pull = Pin.PULL_UP))

oled = OLED12864_I2C(i2c)
oled.text(0, 0, '0123456789')
oled.Font('Font_8x16')
oled.text(0, 1, '0123456789')
oled.Font('Font_12x24')
oled.text(0, 3, '0123456789')

lovelds

All the masters show their magical powers

stategrid

Thanks, I registered to see it.

dcexpert

stategrid posted on 2020-2-4 16:44 Thank you, I registered to take a look

Welcome to learn and communicate together

Ediwin

Good things should be collected

zhnwd

OLED display driver[ edit ]

小莉莉

Good things need to be collected

stategrid

Some analysis of the code, I am a novice and a layman, please give me some advice

First of all, the screen resolution is 128*64. The dot matrix display mode is from left to right from def text_6x8. After the horizontal coordinate scans to 128, it turns to the starting point of the next line, that is, x=0, y+1.

x > 120 instead of x > 126, I think to avoid going out of range?

Then the display method of these displays is to open a buffer, some are in the display controller, some are in the MCU memory, and some are both. The size of the buffer is the same as the screen, 128*64, that is, corresponding to each point on the screen.

By rewriting the buffer and sending the rewriting result to the hardware interface, the characters can be displayed.

The next step is to find the corresponding character position in font to see what content to rewrite. This part of the code is not clear

def char_6x8(self, x=0, y=0, ch=32, c=1):
try:
ind = x + y * 128 + 1
n = (min(127, max(ord(ch), 32)) -32)*5
for i in range(5):
screen[ind+i] = Font_6x8[n+i] if c else Font_6x8[n+i]^0xFF
screen[ind+5] = 0 if c else 0xFF
self .set_pos(x, y)
self.i2c.writeto(self.ADDR, b'\x40' + screen[ind:ind + 6])
except:
return

def text_6x8(self, x=0, y=0, s='', c=1, wrap=0):
for i in range(len(s)):
self.char(x, y, s[i] , c)
x += 6
if wrap and x > 120:
x = 0
y += 1

stone528

See if this works.

dcexpert

stategrid posted on 2020-2-8 04:58 Some analysis of the code, I am a novice and a layman, please give me some advice. First of all, the screen resolution is 128*64, and the dot matrix display mode is from def text_6 ...

When using the i2c or spi method, because the internal cache data of the oled cannot be read, a 128x64/8=1024-byte buffer needs to be opened externally.

Because the font is not large, it is faster to put it directly into RAM. If you want to display Chinese, the font library is large, it is best to put it in flash, or use a dedicated font chip.

hupozhao

Awesome. Let's learn

sblpp

Thanks for sharing

798365837

Thank you, I'll learn from you.

TANGYOUQIAN

Good things should be collected

eon_xyz

study

qwqwqw2088

See what's going on

avista

study

sanxiawu

Take a look and learn

raymond88

Thank you for sharing