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Lauchmelder23§
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example/example
Executable file
BIN
example/example
Executable file
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14
example/example.c
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14
example/example.c
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#include "../raspberrylcd.h"
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int main(void)
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{
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LCDScreen screen;
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configurePins(&screen, 7, 9, 8, 0, 0, 0, 0, 21, 22, 23, 24);
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initScreen(&screen, HALF_BYTE_INTERFACE, TWO_LINES, FONT_5x7, CURSOR_ON | CURSOR_BLINK, LEFT_TO_RIGHT);
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sendData(&screen, JAPANESE_QUOTE_START);
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sendData(&screen, JAPANESE_QUOTE_END);
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resetPins(&screen);
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return 0;
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}
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127
raspberrylcd.c
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127
raspberrylcd.c
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#include "raspberrylcd.h"
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#include <wiringPi.h>
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#include <stdio.h>
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void waitMs(uint32_t ms)
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{
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delay(ms);
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}
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LCDScreen* configurePins(LCDScreen* screen, uint8_t RS, uint8_t RW, uint8_t E,
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uint8_t D0, uint8_t D1, uint8_t D2, uint8_t D3,
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uint8_t D4, uint8_t D5, uint8_t D6, uint8_t D7)
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{
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screen->RS = RS;
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screen->RW = RW;
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screen->E = E;
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screen->D0 = D0;
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screen->D1 = D1;
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screen->D2 = D2;
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screen->D3 = D3;
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screen->D4 = D4;
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screen->D5 = D5;
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screen->D6 = D6;
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screen->D7 = D7;
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wiringPiSetup();
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pinMode(screen->RS, OUTPUT);
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pinMode(screen->RW, OUTPUT);
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pinMode(screen->E, OUTPUT);
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pinMode(screen->D0, OUTPUT);
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pinMode(screen->D1, OUTPUT);
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pinMode(screen->D2, OUTPUT);
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pinMode(screen->D3, OUTPUT);
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pinMode(screen->D4, OUTPUT);
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pinMode(screen->D5, OUTPUT);
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pinMode(screen->D6, OUTPUT);
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pinMode(screen->D7, OUTPUT);
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return screen;
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}
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void initScreen(LCDScreen* screen, uint8_t interface_bits, uint8_t num_lines, uint8_t fontType, uint8_t cursor, uint8_t writeDirection)
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{
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screen->interface_bits = interface_bits;
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sendCommand(screen, (FUNCTION_SET | HALF_BYTE_INTERFACE) >> 4);
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sendCommand(screen, FUNCTION_SET | num_lines | fontType);
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sendCommand(screen, DISPLAY_SWITCH | DISPLAY_ON | cursor);
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sendCommand(screen, SCREEN_CLEAR);
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sendCommand(screen, INPUT_SET | writeDirection);
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}
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void resetPins(LCDScreen* screen)
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{
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digitalWrite(screen->D7, LOW);
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digitalWrite(screen->D6, LOW);
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digitalWrite(screen->D5, LOW);
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digitalWrite(screen->D4, LOW);
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digitalWrite(screen->D3, LOW);
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digitalWrite(screen->D2, LOW);
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digitalWrite(screen->D1, LOW);
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digitalWrite(screen->D0, LOW);
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digitalWrite(screen->E, LOW);
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digitalWrite(screen->RW, LOW);
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digitalWrite(screen->RS, LOW);
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}
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void helper_send(LCDScreen* screen, uint8_t byte)
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{
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digitalWrite(screen->E, HIGH);
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digitalWrite(screen->D7, (byte >> 7) & 0x1);
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digitalWrite(screen->D6, (byte >> 6) & 0x1);
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digitalWrite(screen->D5, (byte >> 5) & 0x1);
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digitalWrite(screen->D4, (byte >> 4) & 0x1);
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if(screen->interface_bits == FULL_BYTE_INTERFACE)
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{
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digitalWrite(screen->D3, (byte >> 3) & 0x1);
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digitalWrite(screen->D2, (byte >> 2) & 0x1);
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digitalWrite(screen->D1, (byte >> 1) & 0x1);
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digitalWrite(screen->D0, (byte >> 0) & 0x1);
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}
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else if(screen->interface_bits == HALF_BYTE_INTERFACE)
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{
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delayMicroseconds(1000);
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digitalWrite(screen->E, LOW);
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delayMicroseconds(10000);
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digitalWrite(screen->E, HIGH);
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digitalWrite(screen->D7, (byte >> 3) & 0x1);
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digitalWrite(screen->D6, (byte >> 2) & 0x1);
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digitalWrite(screen->D5, (byte >> 1) & 0x1);
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digitalWrite(screen->D4, (byte >> 0) & 0x1);
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}
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delayMicroseconds(1000);
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digitalWrite(screen->E, LOW);
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delayMicroseconds(10000);
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}
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void sendCommand(LCDScreen* screen, uint8_t command)
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{
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digitalWrite(screen->RW, LOW);
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digitalWrite(screen->RS, LOW);
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helper_send(screen, command);
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}
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void sendData(LCDScreen* screen, uint8_t data)
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{
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digitalWrite(screen->RW, LOW);
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digitalWrite(screen->RS, HIGH);
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helper_send(screen, data);
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}
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void sendText(LCDScreen* screen, const char* text)
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{
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for(const char* c = text; *c != '\x00'; c++)
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sendData(screen, *c);
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}
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62
raspberrylcd.h
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62
raspberrylcd.h
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#ifndef RASPBERRY_LCD_H
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#define RASPBERRY_LCD_H
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// Commands
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#define SCREEN_CLEAR 0b00000001
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#define CURSOR_RETURN 0b00000010
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#define INPUT_SET 0b00000100
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#define DISPLAY_SWITCH 0b00001000
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#define SHIFT 0b00010000
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#define FUNCTION_SET 0b00100000
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#define CGRAM_AD_SET 0b01000000
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#define DDRAM_AD_SET 0b10000000
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// Parameters
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#define LEFT_TO_RIGHT 0b10
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#define RIGHT_TO_LEFT 0b00
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#define DISPLAY_ON 0b100
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#define DISPLAY_OFF 0b000
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#define CURSOR_ON 0b010
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#define CURSOR_OFF 0b000
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#define CURSOR_BLINK 0b001
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#define CURSOR_STATIC 0b000
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#define DISPLAY_SHIFT 0b1000
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#define CURSOR_SHIFT 0b0000
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#define RIGHT_SHIFT 0b0100
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#define LEFT_SHIFT 0b0000
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#define FULL_BYTE_INTERFACE 0b10000
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#define HALF_BYTE_INTERFACE 0b00000
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#define ONE_LINE 0b00000
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#define TWO_LINES 0b01000
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#define FONT_5x10 0b00100
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#define FONT_5x7 0b00000
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// Special characters supported by the LCD
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#define YEN_CURRENCY 0b01011100
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#define ARROW_RIGHT 0b01111110
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#define ARROW_LEFT 0b01111111
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#define JAPANESE_PERIOD 0b10100001
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#define JAPANESE_QUOTE_START 0b10100010
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#define JAPANESE_QUOTE_END 0b10100011
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#include <stdint.h>
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extern void waitMs(uint32_t ms);
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typedef struct {
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uint8_t RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7;
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uint8_t interface_bits;
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} LCDScreen;
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extern LCDScreen* configurePins(LCDScreen* screen, uint8_t RS, uint8_t RW, uint8_t E,
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uint8_t D0, uint8_t D1, uint8_t D2, uint8_t D3,
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uint8_t D4, uint8_t D5, uint8_t D6, uint8_t D7);
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extern void initScreen(LCDScreen* screen, uint8_t interface_bits, uint8_t num_lines, uint8_t fontType, uint8_t cursor, uint8_t writeDirection);
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extern void resetPins(LCDScreen* screen);
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extern void sendCommand(LCDScreen* screen, uint8_t command);
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extern void sendData(LCDScreen* screen, uint8_t data);
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extern void sendText(LCDScreen* screen, const char* text);
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#endif // RASPBERRY_LCD_H
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