API tools faq
paste
Advertisement
Guest User

Sunfounder1

a guest
May 25th, 2018
73
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
text 7.26 KB | None | 0 0
raw download clone embed print report
  1. #!/usr/bin/env python
  2.  
  3. #
  4. # based on code from lrvick and LiquidCrystal
  5. # lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py
  6. # LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp
  7. #
  8.  
  9. from time import sleep
  10.  
  11. class Adafruit_CharLCD:
  12.  
  13. # commands
  14. LCD_CLEARDISPLAY = 0x01
  15. LCD_RETURNHOME = 0x02
  16. LCD_ENTRYMODESET = 0x04
  17. LCD_DISPLAYCONTROL = 0x08
  18. LCD_CURSORSHIFT = 0x10
  19. LCD_FUNCTIONSET = 0x20
  20. LCD_SETCGRAMADDR = 0x40
  21. LCD_SETDDRAMADDR = 0x80
  22.  
  23. # flags for display entry mode
  24. LCD_ENTRYRIGHT = 0x00
  25. LCD_ENTRYLEFT = 0x02
  26. LCD_ENTRYSHIFTINCREMENT = 0x01
  27. LCD_ENTRYSHIFTDECREMENT = 0x00
  28.  
  29. # flags for display on/off control
  30. LCD_DISPLAYON = 0x04
  31. LCD_DISPLAYOFF = 0x00
  32. LCD_CURSORON = 0x02
  33. LCD_CURSOROFF = 0x00
  34. LCD_BLINKON = 0x01
  35. LCD_BLINKOFF = 0x00
  36.  
  37. # flags for display/cursor shift
  38. LCD_DISPLAYMOVE = 0x08
  39. LCD_CURSORMOVE = 0x00
  40.  
  41. # flags for display/cursor shift
  42. LCD_DISPLAYMOVE = 0x08
  43. LCD_CURSORMOVE = 0x00
  44. LCD_MOVERIGHT = 0x04
  45. LCD_MOVELEFT = 0x00
  46.  
  47. # flags for function set
  48. LCD_8BITMODE = 0x10
  49. LCD_4BITMODE = 0x00
  50. LCD_2LINE = 0x08
  51. LCD_1LINE = 0x00
  52. LCD_5x10DOTS = 0x04
  53. LCD_5x8DOTS = 0x00
  54.  
  55.  
  56.  
  57. def __init__(self, pin_rs=27, pin_e=22, pins_db=[25, 24, 23, 18], GPIO = None):
  58. # Emulate the old behavior of using RPi.GPIO if we haven't been given
  59. # an explicit GPIO interface to use
  60. if not GPIO:
  61. import RPi.GPIO as GPIO
  62. self.GPIO = GPIO
  63. self.pin_rs = pin_rs
  64. self.pin_e = pin_e
  65. self.pins_db = pins_db
  66.  
  67. self.GPIO.setmode(GPIO.BCM)
  68. self.GPIO.setup(self.pin_e, GPIO.OUT)
  69. self.GPIO.setup(self.pin_rs, GPIO.OUT)
  70.  
  71. for pin in self.pins_db:
  72. self.GPIO.setup(pin, GPIO.OUT)
  73.  
  74. self.write4bits(0x33) # initialization
  75. self.write4bits(0x32) # initialization
  76. self.write4bits(0x28) # 2 line 5x7 matrix
  77. self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor
  78. self.write4bits(0x06) # shift cursor right
  79.  
  80. self.displaycontrol = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF
  81.  
  82. self.displayfunction = self.LCD_4BITMODE | self.LCD_1LINE | self.LCD_5x8DOTS
  83. self.displayfunction |= self.LCD_2LINE
  84.  
  85. """ Initialize to default text direction (for romance languages) """
  86. self.displaymode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT
  87. self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) # set the entry mode
  88.  
  89. self.clear()
  90.  
  91.  
  92. def begin(self, cols, lines):
  93.  
  94. if (lines > 1):
  95. self.numlines = lines
  96. self.displayfunction |= self.LCD_2LINE
  97. self.currline = 0
  98.  
  99.  
  100. def home(self):
  101.  
  102. self.write4bits(self.LCD_RETURNHOME) # set cursor position to zero
  103. self.delayMicroseconds(3000) # this command takes a long time!
  104.  
  105.  
  106. def clear(self):
  107.  
  108. self.write4bits(self.LCD_CLEARDISPLAY) # command to clear display
  109. self.delayMicroseconds(3000) # 3000 microsecond sleep, clearing the display takes a long time
  110.  
  111.  
  112. def setCursor(self, col, row):
  113.  
  114. self.row_offsets = [ 0x00, 0x40, 0x14, 0x54 ]
  115.  
  116. if ( row > self.numlines ):
  117. row = self.numlines - 1 # we count rows starting w/0
  118.  
  119. self.write4bits(self.LCD_SETDDRAMADDR | (col + self.row_offsets[row]))
  120.  
  121.  
  122. def noDisplay(self):
  123. """ Turn the display off (quickly) """
  124.  
  125. self.displaycontrol &= ~self.LCD_DISPLAYON
  126. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  127.  
  128.  
  129. def display(self):
  130. """ Turn the display on (quickly) """
  131.  
  132. self.displaycontrol |= self.LCD_DISPLAYON
  133. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  134.  
  135.  
  136. def noCursor(self):
  137. """ Turns the underline cursor on/off """
  138.  
  139. self.displaycontrol &= ~self.LCD_CURSORON
  140. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  141.  
  142.  
  143. def cursor(self):
  144. """ Cursor On """
  145.  
  146. self.displaycontrol |= self.LCD_CURSORON
  147. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  148.  
  149.  
  150. def noBlink(self):
  151. """ Turn on and off the blinking cursor """
  152.  
  153. self.displaycontrol &= ~self.LCD_BLINKON
  154. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  155.  
  156.  
  157. def noBlink(self):
  158. """ Turn on and off the blinking cursor """
  159.  
  160. self.displaycontrol &= ~self.LCD_BLINKON
  161. self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
  162.  
  163.  
  164. def DisplayLeft(self):
  165. """ These commands scroll the display without changing the RAM """
  166.  
  167. self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT)
  168.  
  169.  
  170. def scrollDisplayRight(self):
  171. """ These commands scroll the display without changing the RAM """
  172.  
  173. self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT);
  174.  
  175.  
  176. def leftToRight(self):
  177. """ This is for text that flows Left to Right """
  178.  
  179. self.displaymode |= self.LCD_ENTRYLEFT
  180. self.write4bits(self.LCD_ENTRYMODESET | self.displaymode);
  181.  
  182.  
  183. def rightToLeft(self):
  184. """ This is for text that flows Right to Left """
  185. self.displaymode &= ~self.LCD_ENTRYLEFT
  186. self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
  187.  
  188.  
  189. def autoscroll(self):
  190. """ This will 'right justify' text from the cursor """
  191.  
  192. self.displaymode |= self.LCD_ENTRYSHIFTINCREMENT
  193. self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
  194.  
  195.  
  196. def noAutoscroll(self):
  197. """ This will 'left justify' text from the cursor """
  198.  
  199. self.displaymode &= ~self.LCD_ENTRYSHIFTINCREMENT
  200. self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
  201.  
  202.  
  203. def write4bits(self, bits, char_mode=False):
  204. """ Send command to LCD """
  205.  
  206. self.delayMicroseconds(1000) # 1000 microsecond sleep
  207.  
  208. bits=bin(bits)[2:].zfill(8)
  209.  
  210. self.GPIO.output(self.pin_rs, char_mode)
  211.  
  212. for pin in self.pins_db:
  213. self.GPIO.output(pin, False)
  214.  
  215. for i in range(4):
  216. if bits[i] == "1":
  217. self.GPIO.output(self.pins_db[::-1][i], True)
  218.  
  219. self.pulseEnable()
  220.  
  221. for pin in self.pins_db:
  222. self.GPIO.output(pin, False)
  223.  
  224. for i in range(4,8):
  225. if bits[i] == "1":
  226. self.GPIO.output(self.pins_db[::-1][i-4], True)
  227.  
  228. self.pulseEnable()
  229.  
  230.  
  231. def delayMicroseconds(self, microseconds):
  232. seconds = microseconds / float(1000000) # divide microseconds by 1 million for seconds
  233. sleep(seconds)
  234.  
  235.  
  236. def pulseEnable(self):
  237. self.GPIO.output(self.pin_e, False)
  238. self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns
  239. self.GPIO.output(self.pin_e, True)
  240. self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns
  241. self.GPIO.output(self.pin_e, False)
  242. self.delayMicroseconds(1) # commands need > 37us to settle
  243.  
  244.  
  245. def message(self, text):
  246. """ Send string to LCD. Newline wraps to second line"""
  247.  
  248. for char in text:
  249. if char == '\n':
  250. self.write4bits(0xC0) # next line
  251. else:
  252. self.write4bits(ord(char),True)
  253.  
  254. def loop():
  255. lcd = Adafruit_CharLCD()
  256. while True:
  257. lcd.clear()
  258. lcd.message(" LCD 1602 Test \n123456789ABCDEF")
  259. sleep(2)
  260. lcd.clear()
  261. lcd.message(" SUNFOUNDER \nHello World ! :)")
  262. sleep(2)
  263. lcd.clear()
  264. lcd.message("Welcom to --->\n sunfounder.com")
  265. sleep(2)
  266.  
  267. if __name__ == '__main__':
  268. loop()
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement
Public Pastes
Advertisement
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!