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Lauchmelder23§ 2020-11-19 22:12:36 +00:00
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example/example Executable file
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#include "../raspberrylcd.h"
int main(void)
{
LCDScreen screen;
configurePins(&screen, 7, 9, 8, 0, 0, 0, 0, 21, 22, 23, 24);
initScreen(&screen, HALF_BYTE_INTERFACE, TWO_LINES, FONT_5x7, CURSOR_ON | CURSOR_BLINK, LEFT_TO_RIGHT);
sendData(&screen, JAPANESE_QUOTE_START);
sendData(&screen, JAPANESE_QUOTE_END);
resetPins(&screen);
return 0;
}

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#include "raspberrylcd.h"
#include <wiringPi.h>
#include <stdio.h>
void waitMs(uint32_t ms)
{
delay(ms);
}
LCDScreen* configurePins(LCDScreen* screen, uint8_t RS, uint8_t RW, uint8_t E,
uint8_t D0, uint8_t D1, uint8_t D2, uint8_t D3,
uint8_t D4, uint8_t D5, uint8_t D6, uint8_t D7)
{
screen->RS = RS;
screen->RW = RW;
screen->E = E;
screen->D0 = D0;
screen->D1 = D1;
screen->D2 = D2;
screen->D3 = D3;
screen->D4 = D4;
screen->D5 = D5;
screen->D6 = D6;
screen->D7 = D7;
wiringPiSetup();
pinMode(screen->RS, OUTPUT);
pinMode(screen->RW, OUTPUT);
pinMode(screen->E, OUTPUT);
pinMode(screen->D0, OUTPUT);
pinMode(screen->D1, OUTPUT);
pinMode(screen->D2, OUTPUT);
pinMode(screen->D3, OUTPUT);
pinMode(screen->D4, OUTPUT);
pinMode(screen->D5, OUTPUT);
pinMode(screen->D6, OUTPUT);
pinMode(screen->D7, OUTPUT);
return screen;
}
void initScreen(LCDScreen* screen, uint8_t interface_bits, uint8_t num_lines, uint8_t fontType, uint8_t cursor, uint8_t writeDirection)
{
screen->interface_bits = interface_bits;
sendCommand(screen, (FUNCTION_SET | HALF_BYTE_INTERFACE) >> 4);
sendCommand(screen, FUNCTION_SET | num_lines | fontType);
sendCommand(screen, DISPLAY_SWITCH | DISPLAY_ON | cursor);
sendCommand(screen, SCREEN_CLEAR);
sendCommand(screen, INPUT_SET | writeDirection);
}
void resetPins(LCDScreen* screen)
{
digitalWrite(screen->D7, LOW);
digitalWrite(screen->D6, LOW);
digitalWrite(screen->D5, LOW);
digitalWrite(screen->D4, LOW);
digitalWrite(screen->D3, LOW);
digitalWrite(screen->D2, LOW);
digitalWrite(screen->D1, LOW);
digitalWrite(screen->D0, LOW);
digitalWrite(screen->E, LOW);
digitalWrite(screen->RW, LOW);
digitalWrite(screen->RS, LOW);
}
void helper_send(LCDScreen* screen, uint8_t byte)
{
digitalWrite(screen->E, HIGH);
digitalWrite(screen->D7, (byte >> 7) & 0x1);
digitalWrite(screen->D6, (byte >> 6) & 0x1);
digitalWrite(screen->D5, (byte >> 5) & 0x1);
digitalWrite(screen->D4, (byte >> 4) & 0x1);
if(screen->interface_bits == FULL_BYTE_INTERFACE)
{
digitalWrite(screen->D3, (byte >> 3) & 0x1);
digitalWrite(screen->D2, (byte >> 2) & 0x1);
digitalWrite(screen->D1, (byte >> 1) & 0x1);
digitalWrite(screen->D0, (byte >> 0) & 0x1);
}
else if(screen->interface_bits == HALF_BYTE_INTERFACE)
{
delayMicroseconds(1000);
digitalWrite(screen->E, LOW);
delayMicroseconds(10000);
digitalWrite(screen->E, HIGH);
digitalWrite(screen->D7, (byte >> 3) & 0x1);
digitalWrite(screen->D6, (byte >> 2) & 0x1);
digitalWrite(screen->D5, (byte >> 1) & 0x1);
digitalWrite(screen->D4, (byte >> 0) & 0x1);
}
delayMicroseconds(1000);
digitalWrite(screen->E, LOW);
delayMicroseconds(10000);
}
void sendCommand(LCDScreen* screen, uint8_t command)
{
digitalWrite(screen->RW, LOW);
digitalWrite(screen->RS, LOW);
helper_send(screen, command);
}
void sendData(LCDScreen* screen, uint8_t data)
{
digitalWrite(screen->RW, LOW);
digitalWrite(screen->RS, HIGH);
helper_send(screen, data);
}
void sendText(LCDScreen* screen, const char* text)
{
for(const char* c = text; *c != '\x00'; c++)
sendData(screen, *c);
}

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#ifndef RASPBERRY_LCD_H
#define RASPBERRY_LCD_H
// Commands
#define SCREEN_CLEAR 0b00000001
#define CURSOR_RETURN 0b00000010
#define INPUT_SET 0b00000100
#define DISPLAY_SWITCH 0b00001000
#define SHIFT 0b00010000
#define FUNCTION_SET 0b00100000
#define CGRAM_AD_SET 0b01000000
#define DDRAM_AD_SET 0b10000000
// Parameters
#define LEFT_TO_RIGHT 0b10
#define RIGHT_TO_LEFT 0b00
#define DISPLAY_ON 0b100
#define DISPLAY_OFF 0b000
#define CURSOR_ON 0b010
#define CURSOR_OFF 0b000
#define CURSOR_BLINK 0b001
#define CURSOR_STATIC 0b000
#define DISPLAY_SHIFT 0b1000
#define CURSOR_SHIFT 0b0000
#define RIGHT_SHIFT 0b0100
#define LEFT_SHIFT 0b0000
#define FULL_BYTE_INTERFACE 0b10000
#define HALF_BYTE_INTERFACE 0b00000
#define ONE_LINE 0b00000
#define TWO_LINES 0b01000
#define FONT_5x10 0b00100
#define FONT_5x7 0b00000
// Special characters supported by the LCD
#define YEN_CURRENCY 0b01011100
#define ARROW_RIGHT 0b01111110
#define ARROW_LEFT 0b01111111
#define JAPANESE_PERIOD 0b10100001
#define JAPANESE_QUOTE_START 0b10100010
#define JAPANESE_QUOTE_END 0b10100011
#include <stdint.h>
extern void waitMs(uint32_t ms);
typedef struct {
uint8_t RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7;
uint8_t interface_bits;
} LCDScreen;
extern LCDScreen* configurePins(LCDScreen* screen, uint8_t RS, uint8_t RW, uint8_t E,
uint8_t D0, uint8_t D1, uint8_t D2, uint8_t D3,
uint8_t D4, uint8_t D5, uint8_t D6, uint8_t D7);
extern void initScreen(LCDScreen* screen, uint8_t interface_bits, uint8_t num_lines, uint8_t fontType, uint8_t cursor, uint8_t writeDirection);
extern void resetPins(LCDScreen* screen);
extern void sendCommand(LCDScreen* screen, uint8_t command);
extern void sendData(LCDScreen* screen, uint8_t data);
extern void sendText(LCDScreen* screen, const char* text);
#endif // RASPBERRY_LCD_H