Hallo liebe RPi-Freunde :thumbs1:
hoffentlich könnt ihr mir helfen. Und zwar habe ich ein vierzeiliges HD44780 Display am RPi angeschlossen und es funktioniert auch schon, zwar noch nicht wie gewollt, aber zumindest etwas
Mit folgendem Code wird der im Video zu sehende Text ausgegeben.
#!/usr/bin/python
# The wiring for the LCD is as follows:
# 1 : GND
# 2 : 5V
# 3 : Contrast (0-5V)*
# 4 : RS (Register Select)
# 5 : R/W (Read Write) - GROUND THIS PIN
# 6 : Enable or Strobe
# 7 : Data Bit 0 - NOT USED
# 8 : Data Bit 1 - NOT USED
# 9 : Data Bit 2 - NOT USED
# 10: Data Bit 3 - NOT USED
# 11: Data Bit 4
# 12: Data Bit 5
# 13: Data Bit 6
# 14: Data Bit 7
# 15: LCD Backlight +5V**
# 16: LCD Backlight GND
#import
import RPi.GPIO as GPIO
import time
# Define GPIO to LCD mapping
LCD_RS = 7
LCD_E = 8
LCD_D4 = 25
LCD_D5 = 24
LCD_D6 = 23
LCD_D7 = 18
LED_ON = 15
# Define some device constants
LCD_WIDTH = 20 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line
LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line
# Timing constants
E_PULSE = 0.00005
E_DELAY = 0.00005
def main():
# Main program block
GPIO.setmode(GPIO.BCM) # Use BCM GPIO numbers
GPIO.setup(LCD_E, GPIO.OUT) # E
GPIO.setup(LCD_RS, GPIO.OUT) # RS
GPIO.setup(LCD_D4, GPIO.OUT) # DB4
GPIO.setup(LCD_D5, GPIO.OUT) # DB5
GPIO.setup(LCD_D6, GPIO.OUT) # DB6
GPIO.setup(LCD_D7, GPIO.OUT) # DB7
GPIO.setup(LED_ON, GPIO.OUT) # Backlight enable
# Initialise display
lcd_init()
# Toggle backlight off-on
GPIO.output(LED_ON, False)
time.sleep(1)
GPIO.output(LED_ON, True)
time.sleep(1)
# Send some centred test
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("********************",2)
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string("Rasbperry Pi",2)
lcd_byte(LCD_LINE_3, LCD_CMD)
lcd_string("Model B",2)
lcd_byte(LCD_LINE_4, LCD_CMD)
lcd_string("********************",2)
time.sleep(5) # 5 second delay
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("Nintendo",2)
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string("SEGA",2)
lcd_byte(LCD_LINE_3, LCD_CMD)
lcd_string("",2)
lcd_byte(LCD_LINE_4, LCD_CMD)
lcd_string("Copyright is nothing",2)
time.sleep(3) # 3 second delay
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("*RetroPie*",2)
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string("*EmulationStation*",2)
lcd_byte(LCD_LINE_3, LCD_CMD)
lcd_string("********************",2)
lcd_byte(LCD_LINE_4, LCD_CMD)
lcd_string("Raspberry Pi inside!",2)
time.sleep(3) # 3 second delay
def lcd_init():
# Initialise display
lcd_byte(0x33,LCD_CMD)
lcd_byte(0x32,LCD_CMD)
lcd_byte(0x28,LCD_CMD)
lcd_byte(0x0C,LCD_CMD)
lcd_byte(0x06,LCD_CMD)
lcd_byte(0x01,LCD_CMD)
def lcd_string(message,style):
# Send string to display
# style=1 Left justified
# style=2 Centred
# style=3 Right justified
if style==1:
message = message.ljust(LCD_WIDTH," ")
elif style==2:
message = message.center(LCD_WIDTH," ")
elif style==3:
message = message.rjust(LCD_WIDTH," ")
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
def lcd_byte(bits, mode):
# Send byte to data pins
# bits = data
# mode = True for character
# False for command
GPIO.output(LCD_RS, mode) # RS
# High bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x10==0x10:
GPIO.output(LCD_D4, True)
if bits&0x20==0x20:
GPIO.output(LCD_D5, True)
if bits&0x40==0x40:
GPIO.output(LCD_D6, True)
if bits&0x80==0x80:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
# Low bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x01==0x01:
GPIO.output(LCD_D4, True)
if bits&0x02==0x02:
GPIO.output(LCD_D5, True)
if bits&0x04==0x04:
GPIO.output(LCD_D6, True)
if bits&0x08==0x08:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
if __name__ == '__main__':
main()
Alles anzeigen
Und jetzt kommt das schwierige: nach genau diesem Text soll das LCD anzeigen in welcher Spieleübersicht ich mich befinde, also NES, GameBoy, MegaDrive usw und welches Spiel ausgewählt ist. Und sobald ein Spiel gestartet ist hätte ich gern so was wie:
(1.Zeile) Playing
(2.Zeile) Nintendo
(3.Zeile) GameBoy
(4.Zeile) Super Mario Land
Wenn ich das Spiel beendet habe, soll es dann wieder die Spieleübersicht anzeigen.
Hoffentlich findet sich hier jemand der mir hilft. Wer will kann von mir auch alle config Dateien oder ähnliches bekommen.