apo/LoRa-Workshop
1
0
Fork 0
forked from Telos4/LoRa-Workshop
Code Issues Pull Requests Releases Wiki Activity

added ssd1306 display library

Browse Source
This commit is contained in:
Simon Pirkelmann 2019-11-21 16:39:54 +01:00
parent 88c6d94a78
commit c00c001009
2 changed files with 257 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

162
micropython/uPySensors/ssd1306.py Normal file
View File

@ -0,0 +1,162 @@
# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
from micropython import const
import time
import framebuf
# register definitions
SET_CONTRAST = const(0x81)
SET_ENTIRE_ON = const(0xa4)
SET_NORM_INV = const(0xa6)
SET_DISP = const(0xae)
SET_MEM_ADDR = const(0x20)
SET_COL_ADDR = const(0x21)
SET_PAGE_ADDR = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP = const(0xa0)
SET_MUX_RATIO = const(0xa8)
SET_COM_OUT_DIR = const(0xc0)
SET_DISP_OFFSET = const(0xd3)
SET_COM_PIN_CFG = const(0xda)
SET_DISP_CLK_DIV = const(0xd5)
SET_PRECHARGE = const(0xd9)
SET_VCOM_DESEL = const(0xdb)
SET_CHARGE_PUMP = const(0x8d)
class SSD1306:
def __init__(self, width, height, external_vcc):
self.width = width
self.height = height
self.external_vcc = external_vcc
self.pages = self.height // 8
self.buffer = bytearray(self.pages * self.width)
fb = framebuf.FrameBuffer(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
self.framebuf = fb
# Provide methods for accessing FrameBuffer graphics primitives. This is a
# workround because inheritance from a native class is currently unsupported.
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
self.fill = fb.fill
self.pixel = fb.pixel
self.hline = fb.hline
self.vline = fb.vline
self.line = fb.line
self.rect = fb.rect
self.fill_rect = fb.fill_rect
self.text = fb.text
self.scroll = fb.scroll
self.blit = fb.blit
self.poweron()
self.init_display()
def init_display(self):
for cmd in (
SET_DISP | 0x00, # off
# address setting
SET_MEM_ADDR, 0x00, # horizontal
# resolution and layout
SET_DISP_START_LINE | 0x00,
SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
SET_MUX_RATIO, self.height - 1,
SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
SET_DISP_OFFSET, 0x00,
SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
# timing and driving scheme
SET_DISP_CLK_DIV, 0x80,
SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
SET_VCOM_DESEL, 0x30, # 0.83*Vcc
# display
SET_CONTRAST, 0xff, # maximum
SET_ENTIRE_ON, # output follows RAM contents
SET_NORM_INV, # not inverted
# charge pump
SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
SET_DISP | 0x01): # on
self.write_cmd(cmd)
self.fill(0)
self.show()
def poweroff(self):
self.write_cmd(SET_DISP | 0x00)
def contrast(self, contrast):
self.write_cmd(SET_CONTRAST)
self.write_cmd(contrast)
def invert(self, invert):
self.write_cmd(SET_NORM_INV | (invert & 1))
def show(self):
x0 = 0
x1 = self.width - 1
if self.width == 64:
# displays with width of 64 pixels are shifted by 32
x0 += 32
x1 += 32
self.write_cmd(SET_COL_ADDR)
self.write_cmd(x0)
self.write_cmd(x1)
self.write_cmd(SET_PAGE_ADDR)
self.write_cmd(0)
self.write_cmd(self.pages - 1)
self.write_data(self.buffer)
class SSD1306_I2C(SSD1306):
def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
self.i2c = i2c
self.addr = addr
self.temp = bytearray(2)
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.temp[0] = 0x80 # Co=1, D/C#=0
self.temp[1] = cmd
self.i2c.writeto(self.addr, self.temp)
def write_data(self, buf):
self.temp[0] = self.addr << 1
self.temp[1] = 0x40 # Co=0, D/C#=1
self.i2c.start()
self.i2c.write(self.temp)
self.i2c.write(buf)
self.i2c.stop()
def poweron(self):
pass
class SSD1306_SPI(SSD1306):
def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
self.rate = 10 * 1024 * 1024
dc.init(dc.OUT, value=0)
res.init(res.OUT, value=0)
cs.init(cs.OUT, value=1)
self.spi = spi
self.dc = dc
self.res = res
self.cs = cs
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs(1)
self.dc(0)
self.cs(0)
self.spi.write(bytearray([cmd]))
self.cs(1)
def write_data(self, buf):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs(1)
self.dc(1)
self.cs(0)
self.spi.write(buf)
self.cs(1)
def poweron(self):
self.res(1)
time.sleep_ms(1)
self.res(0)
time.sleep_ms(10)
self.res(1)

95
micropython/uPySensors/ssd1306_i2c.py Normal file
View File

@ -0,0 +1,95 @@
# https://learn.adafruit.com/micropython-hardware-ssd1306-oled-display/software
import time
from machine import I2C, Pin
from .ssd1306 import SSD1306_I2C
class Display:
def __init__(self,
width = 128, height = 64,
scl_pin_id = 15, sda_pin_id = 4,
freq = 400000):
self.width = width
self.height = height
self.poweron()
self.i2c = I2C(scl = Pin(scl_pin_id, Pin.OUT),
sda = Pin(sda_pin_id),
freq = freq)
self.display = SSD1306_I2C(width, height, self.i2c)
self.show = self.display.show
def poweron(self, pin=16):
pin_reset = Pin(pin, mode=Pin.OUT)
pin_reset.value(0)
time.sleep_ms(50)
pin_reset.value(1)
def clear(self):
self.display.fill(0)
self.display.show()
def show_text(self, text, x = 0, y = 0, clear_first = True, show_now = True, hold_seconds = 0):
if clear_first: self.display.fill(0)
self.display.text(text, x, y)
if show_now:
self.display.show()
if hold_seconds > 0: time.sleep(hold_seconds)
def wrap(self, text, start_line = 0,
height_per_line = 8, width_per_char = 8,
start_pixel_each_line = 0):
chars_per_line = self.width//width_per_char
max_lines = self.height//height_per_line - start_line
lines = [(text[chars_per_line*line: chars_per_line*(line+1)], start_pixel_each_line, height_per_line*(line+start_line))
for line in range(max_lines)]
return lines
def draw_logo(self, x_pos=0):
font_height = 50
min_x = x_pos
min_y = 10
self.display.fill(0)
self.display.fill_rect(min_x, min_y + font_height//2, 5, font_height//2, 1)
self.display.fill_rect(min_x, min_y + font_height//4, 5, 5, 1)
xshift = 10
self.display.rect(xshift + min_x, min_y, 5, font_height, 1)
self.display.rect(xshift + min_x + 4, min_y, font_height//2, font_height//2, 1)
self.display.line(xshift + min_x + 5, min_y + font_height//2, xshift + min_x + 5 + font_height//2, min_y + font_height, 1)
self.display.show()
def show_text_wrap(self, text,
start_line = 0, height_per_line = 8, width_per_char = 8, start_pixel_each_line = 0,
clear_first = True, show_now = True, hold_seconds = 0):
if clear_first: self.clear()
for line, x, y in self.wrap(text, start_line, height_per_line, width_per_char, start_pixel_each_line):
self.show_text(line, x, y, clear_first = False, show_now = False)
if show_now:
self.display.show()
if hold_seconds > 0: time.sleep(hold_seconds)
def show_datetime(self, year, month, day, hour, minute, second):
datetime = [year, month, day, hour, minute, second]
datetime_str = ["{0:0>2}".format(d) for d in datetime]
self.show_text(text = '-'.join(datetime_str[:3]),
x = 0, y = 0, clear_first = True, show_now = False)
self.show_text(text = ':'.join(datetime_str[3:6]),
x = 0, y = 10, clear_first = False, show_now = True)
def show_time(self, year, month, day, hour, minute, second):
self.show_datetime(year, month, day, hour, minute, second)