Nokia5110 LCD顯示

原理介紹

NOKIA 5110 是一款基於圖形顯示的LCD螢幕（如下圖所示），主要這款螢幕，被手機大廠NOKIA 用來裝置在5110 系列手機，因而大受歡迎並且有很多的應用。

Nokia 5110 LCD使用的PCD8544控制器，NOKIA 3110用的也是這款控制器，PCD8554是一款低功耗的CMOS LCD控制器，用於驅動48行84列的圖形顯示，並且採用串列匯流排界面與微控制器相連，大大減少了週邊控制線的數量，在使用時十分的方便，而且相對於LCD1602、LCD12864 都有著自己的獨特優勢。可利用NOKIA 5110單色圖形LCD來顯示資料、文字、畫出幾何圖形等在顯示幕幕上。

電路圖

程式列表

Python – pcd8544.py

"""

MicroPython Nokia 5110 PCD8544 84x48 LCD driver

Reference: https://github.com/mcauser/micropython-pcd8544

"""

from micropython import const

from utime import sleep_us

# Function set 0010 0xxx

FUNCTION_SET = const(0x20)

POWER_DOWN = const(0x04)

ADDRESSING_VERT = const(0x02)

EXTENDED_INSTR = const(0x01)

# Display control 0000 1x0x

DISPLAY_BLANK = const(0x08)

DISPLAY_ALL = const(0x09)

DISPLAY_NORMAL = const(0x0c)

DISPLAY_INVERSE = const(0x0d)

# Temperature control 0000 01xx

TEMP_COEFF_0 = const(0x04)

TEMP_COEFF_1 = const(0x05)

TEMP_COEFF_2 = const(0x06) # default

TEMP_COEFF_3 = const(0x07)

# Bias system 0001 0xxx

BIAS_1_100 = const(0x10)

BIAS_1_80 = const(0x11)

BIAS_1_65 = const(0x12)

BIAS_1_48 = const(0x13)

BIAS_1_40 = const(0x14) # default

BIAS_1_24 = const(0x15)

BIAS_1_18 = const(0x16)

BIAS_1_10 = const(0x17)

class PCD8544:

def __init__(self, spi, cs, dc, rst=None):

self.width = 84

self.height = 48

self.bufferSize = (self.height * self.width // 8)

self.spi = spi

self.cs = cs # chip enable, active LOW

self.dc = dc # data HIGH, command LOW

self.rst = rst # reset, active LOW

self.cs.value(1)

self.dc.value(0)

if self.rst:

self.rst.value(1)

self.reset()

self.init()

def init(self):

# Initialise the display

self.LCDWrite(0, FUNCTION_SET|EXTENDED_INSTR) # extended command mode

self.LCDWrite(0, SET_VOP|49) # write VOP to register

self.LCDWrite(0, TEMP_COEFF_0) # set Temperature Coefficient(TCx)

self.LCDWrite(0, BIAS_1_40) # set Bias System (BSx)

self.LCDWrite(0, FUNCTION_SET) # basic command mode

self.LCDWrite(0, DISPLAY_NORMAL) # b/w mode, horizontal addressing

def reset(self):

# issue reset impulse to reset the display

self.rst.value(1)

sleep_us(100)

self.rst.value(0)

sleep_us(100) # reset impulse has to be >100 ns and <100 ms

self.rst.value(1)

sleep_us(100)

def power_on(self):

self.cs.value(1)

self.fn &= ~POWER_DOWN

self.LCDWrite(0, self.fn)

def power_off(self):

self.fn |= POWER_DOWN

self.LCDWrite(0, self.fn)

def invert(self, invert):

self.LCDWrite(0, DISPLAY_INVERSE if invert else DISPLAY_NORMAL)

def clear(self):

for i in range(0,self.bufferSize):

self.LCDWrite(1, 0x00)

def position(self, x, y):

self.LCDWrite(0, FUNCTION_SET) # basic command mode

# set cursor to column x (0~83), bank y (0~5)

self.LCDWrite(0, COL_ADDR | x) # set x pos (0~83)

self.LCDWrite(0, BANK_ADDR | y) # set y pos (0~5)

def LCDWrite(self, dcval, data):

self.dc.value(dcval)

self.cs.value(0)

self.spi.write(bytearray([data]))

self.cs.value(1)

def LCDShow(self, data):

self.position(0,0)

for i in range(0,self.bufferSize):

self.LCDWrite(1,data[i])

Python – Nokia_5110_Test_SW.py

"""

Filename: Nokia_5110_Test_SW.py

Reference: http://www.multiwingspan.co.uk/micro.php?page=nokia

Connections:

腳位定義 Nokia 5110 LCD

3V3 -> 1.VCC 3.3V logic voltage (0=off, 1=on)

GND -> 2.GND

P9(CS) -> 3.SCE Chip Enable (0=listen for input, 1=ignore input)

P10 -> 4.RST Reset pin (0=reset, 1=normal)

P11 -> 5.DC Data/Command (0=commands, 1=data)

P6(MOSI) -> 6.DIN data flow (Master out, Slave in)

P8(CLK) -> 7.SCK

3V3 -> 8.LED LIGHT Light (0=on, 1=off)

P7(MISO) ->

"""

from micropython import const

from machine import Switch #Get button KEY library

from machine import SPI, Pin

from machine import delay,RTC

from framebuf import FrameBuffer1

import utime

import pcd8544

# draw a 84x48 picture

EPYlogo_NEW_84x48 = bytearray([