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linux-st7735
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Dejvino 3 years ago
parent
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commit
93eda44559
10 changed files with 326 additions and 244 deletions
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  1. +7
    -0
      README.md
  2. +79
    -47
      main.c
  3. +1
    -1
      meson.build
  4. +80
    -0
      spilcd.h
  5. +37
    -0
      spilcd_font.c
  6. +5
    -0
      spilcd_font.h
  7. +41
    -0
      spilcd_gfx.c
  8. +50
    -0
      spilcd_gfx.h
  9. +24
    -98
      st7735.c
  10. +2
    -98
      st7735.h

+ 7
- 0
README.md View File

@@ -0,0 +1,7 @@
# ST7735 SPI Display Toolkit

Built and tested with OrangePi Zero and ST7735 128x160 v1.1 SPI display.

## Resources
* [https://github.com/orangepi-xunlong/WiringOP](orangepi-xunlong/WiringOP) - GPIO controlling library compatible with Raspberry Pi's WiringPi
* [https://github.com/dhepper/font8x8](dhepper/font8x8) - 8x8 pixels monospaced font

+ 79
- 47
main.c View File

@@ -1,74 +1,106 @@
#include <stdio.h>
#include "st7735.h"
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <wiringPi.h>
#include "spilcd.h"
#include "spilcd_gfx.h"
#include "spilcd_font.h"

uint8 random_color_r(int seed);
uint8 random_color_g(int seed);
uint8 random_color_b(int seed);
inline uint8 random_color_r(int seed) { return seed % (256 / 7) * 7; }
inline uint8 random_color_g(int seed) { return seed % (256 / 13) * 13; }
inline uint8 random_color_b(int seed) { return seed % (256 / 23) * 23; }

int main(int argc, char *argv[])
{
setbuf(stdout, NULL);
srand(time(NULL));

wiringPiSetup();

lcd_t* lcd = lcd_init(40000000, 10, 2, 0);
lcd_t* lcd = lcd_init(40000000, 1, 10, 7, 8);

printf("Fill display...");
printf("blue...");
lcd_fillScreen(0, 70, 160);
delay(1000);
lcd_fillScreen(lcd, 0, 70, 160);
printf("...waiting 1 second...");
sleep(1);
printf("black...");
lcd_fillScreen(0, 0, 0);
lcd_fillScreen(lcd, 0, 0, 0);
printf("DONE\n");
delay(1000);

/* Draw the lines */
/*printf("Lines...");
lcdst_drawHLine(0, 149, 128, 0, 255, 255);
lcdst_drawHLine(0, 139, 128, 255, 255, 0);
lcdst_drawVLine(117, 0, 160, 0, 255, 255);
lcdst_drawVLine(107, 0, 160, 255, 255, 0);
printf("DONE\n");*/

/*printf("Points...");
for (int i = 1; i < 20; i++) {
lcdst_drawPx(5 - 1, 70 + i, 100, 100, 100);
lcdst_drawPx(5 + i + 1, 70 + i, 100, 100, 100);

printf("...waiting 1 second...\n");
sleep(1);

printf("Points...");
for (int i = 1; i < 2000; i++) {
int r = rand();
lcd_drawPixel(lcd, r % 128, i % 160,
random_color_r(i),
random_color_g(i),
random_color_b(i));
}
printf("DONE\n");
printf("Triangle...");
for (int i = 1; i < 20; i++) {
lcdst_drawHLine(5, 70 + i, i, 255, 0, 0);

printf("...waiting 1 second...\n");
sleep(1);

printf("Regions...");
int w = 15;
int h = 20;
for (int i = 1; i < 200; i++) {
int x = rand() % (128 - w);
int y = rand() % (160 - h);
lcd_setWindow(lcd, x, y, x + w - 1, y + h - 1);
uint8 r = rand();
uint8 g = rand();
uint8 b = rand();
for (int p = 0; p < w*h; p++) {
lcd_pushPixel(lcd, r * p / (w*h), g * (w*h-p) / (w*h), b);
}
}
printf("DONE\n");*/
printf("DONE\n");

printf("...waiting 1 second...\n");
sleep(1);

printf("Rectangles...");
//printf("outline...");
//lcd_drawRect(10, 10, 10, 10, 0, 255, 255);
//lcd_drawRect(10, 30, 10, 10, 255, 255, 0);
printf("filled...");
lcd_fillRect(30, 10, 10, 10, 0, 255, 255);
lcd_fillRect(30, 30, 10, 10, 255, 255, 0);
printf("bunch...");
for (int i = 0; i < 40; i++) {
lcd_fillRect(40 + (i%13) * 4, 40 + (i%19) * 4, 20, 20, i % 5 * 15, i % 7 * 17, i % 3 * 23);
}
lcd_fillScreen(lcd, 0, 0, 0);
lcd_fillRect(lcd, 30, 10, 10, 10, 0, 255, 255);
lcd_fillRect(lcd, 30, 30, 10, 10, 255, 255, 0);
printf("DONE\n");

printf("...waiting 1 second...\n");
sleep(1);

printf("Text...");
lcd_printChar(10, 90, 'A');
lcd_printText(10, 50, "Ahoj!");
lcd_printChar(10, 100, 'Z');
lcd_fillScreen(lcd, 0, 0, 0);
lcd_printChar(lcd, 10, 90, 'A');
lcd_printText(lcd, 10, 50, "Hello, world!");
lcd_printChar(lcd, 10, 100, 'Z');
printf("DONE\n");

/* Send the raw data */
/* printf("Raw...");
lcdst_setWindow(20, 20, 29, 29);
for(uint8 i=0; i<100; i++) lcdst_pushPx(255, 0, 255);
lcdst_setWindow(0, 0, 127, 159);
printf("DONE\n");*/
printf("...waiting 2 seconds...\n");
sleep(2);

/* Uninitialize the display */
//lcd_deinit(lcd);
printf("Pulsing color...");
for (int i = 0; i < 256; i++) {
lcd_fillScreen(lcd,
random_color_r(i),
random_color_g(i),
random_color_b(i));
}
printf("DONE\n");
printf("...waiting 2 seconds before shutdown...\n");
sleep(2);
printf("Terminating...\n");
lcd_fillScreen(lcd, 0, 0, 0);
lcd_deinit(lcd);
printf("DONE\n");
return 0;
}


+ 1
- 1
meson.build View File

@@ -1,3 +1,3 @@
project('dejvino-ST7735', 'c')
src = ['main.c', 'st7735.c']
src = ['main.c', 'spilcd_gfx.c', 'spilcd_font.c', 'st7735.c']
executable('st7735', src, link_args: '-lwiringPi')

+ 80
- 0
spilcd.h View File

@@ -0,0 +1,80 @@
#ifndef uint8
#define uint8 unsigned char
#endif

#ifndef __SPILCD_H__
#define __SPILCD_H__
typedef struct
{
int channel;
int cs, a0, rs;
uint8 width, height;
} lcd_t;

/*
* Initialize the display.
*
* Parameters:
* spiSpeed - Speed of the SPI interface.
* channel - SPI channel
* cs - Chip selection pin.
* a0 - Data/Command pin.
* rs - Optional reset pin. Use -1 when not connected.
*
* Return: Pointer to the structure with display data.
*
*/
lcd_t *lcd_init(int spiSpeed, int channel, int cs, int a0, int rs);

/*
* Reset the specified display and clear the previously assigned memory.
*
* Parameters:
* lcd - display to use
*
* Return: void
*/
void lcd_deinit(lcd_t *lcd);

/*
* Set the drawing area.
*
* Parameters:
* lcd - display to use
* x1 - The X parameter of the starting point.
* y1 - The Y parameter of the starting point.
* x2 - The X parameter of the ending point.
* y2 - The Y parameter of the ending point.
*
* Return: 0 for success, 1 for error.
*
*/
uint8 lcd_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2);

/*
* Push a pixel into the previously set drawing area.
*
* Parameters:
* lcd - display to use
* r - red color (0 to 255)
* g - green color (0 to 255)
* b - blue color (0 to 255)
*/
void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b);

/*
* Push an array of pixels into the previously set drawing area.
* Significantly faster than pushing pixels individually.
*
* Parameters:
* lcd - display to use
* pixels - array of pixels where:
* pixels[i * 3 + 0] = i-th red color (0 to 255)
* pixels[i * 3 + 1] = i-th green color (0 to 255)
* pixels[i * 3 + 2] = i-th blue color (0 to 255)
* count - number of pixels in the array
*/
void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count);

#endif // __SPILCD_H__


+ 37
- 0
spilcd_font.c View File

@@ -0,0 +1,37 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "spilcd_font.h"
#include "font8x8_basic.h"

static void lcd_pushChar(lcd_t* lcd, char c)
{
char* bitmap = font8x8_basic[(unsigned int) c];
int x,y;
int set;
for (x=0; x < 8; x++) {
for (y=0; y < 8; y++) {
set = bitmap[x] & 1 << y;
if (set) {
lcd_pushPixel(lcd, 200, 0, 0);
} else {
lcd_pushPixel(lcd, 0, 0, 0);
}
}
}
}

void lcd_printChar(lcd_t* lcd, uint8 x, uint8 y, char c)
{
lcd_setWindow(lcd, x, y, x+8 - 1, y+8 - 1);
lcd_pushChar(lcd, c);
}

void lcd_printText(lcd_t* lcd, uint8 x, uint8 y, char* text)
{
for (int i = 0; i < strlen(text); i++) {
lcd_printChar(lcd, x + i * 8, y, text[i]);
}
}


+ 5
- 0
spilcd_font.h View File

@@ -0,0 +1,5 @@
#include "spilcd.h"

void lcd_printChar(lcd_t* lcd, uint8 x, uint8 y, char c);
void lcd_printText(lcd_t* lcd, uint8 x, uint8 y, char* text);


+ 41
- 0
spilcd_gfx.c View File

@@ -0,0 +1,41 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "spilcd_gfx.h"

void lcd_drawPixel(lcd_t* lcd, uint8 x, uint8 y, uint8 r, uint8 g, uint8 b)
{
if(lcd_setWindow(lcd, x, y, x, y)) return;
lcd_pushPixel(lcd, r, g, b);
}

void lcd_fillRect(lcd_t* lcd, uint8 x, uint8 y, uint8 w, uint8 h,
uint8 r, uint8 g, uint8 b)
{
if((w == 0) || (h == 0)) return;
if((x+w-1) >= lcd->width) w = lcd->width - x;
if((y+h-1) >= lcd->height) h = lcd->height - y;
if(lcd_setWindow(lcd, x, y, x+w-1, y+h-1)) return;

#define BUFFER_PIXELS 64
int wh = w*h;
uint8 buffer[BUFFER_PIXELS * sizeof(uint8) * 3];
for (int p = 0; p < wh; p += BUFFER_PIXELS) {
for(int pb = 0; pb < BUFFER_PIXELS; pb++) {
buffer[pb * 3 + 0] = r;
buffer[pb * 3 + 1] = g;
buffer[pb * 3 + 2] = b;
}
int rem = wh - p;
lcd_pushPixels(lcd, buffer, ((rem < BUFFER_PIXELS) ? rem : BUFFER_PIXELS));
}
}

void lcd_fillScreen(lcd_t* lcd, uint8 r, uint8 g, uint8 b)
{
lcd_fillRect(lcd, 0, 0,
lcd->width, lcd->height,
r, g, b);
}


+ 50
- 0
spilcd_gfx.h View File

@@ -0,0 +1,50 @@
#include "spilcd.h"

/*
* Draw one pixel on the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* x - The X parameter of the pixel.
* y - The Y parameter of the pixel.
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_drawPixel(lcd_t* lcd, uint8 x, uint8 y, uint8 r, uint8 g, uint8 b);

/*
* Draw a filled rectangle on the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* x - Parameter X of the upper left corner of the rectangle.
* y - Parameter Y of the upper left corner of the rectangle.
* w - The width of the rectangle.
* h - The height of the rectangle.
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_fillRect(lcd_t* lcd, uint8 x, uint8 y, uint8 w, uint8 h, uint8 r, uint8 g, uint8 b);

/*
* Fill the entire screen with one color of the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_fillScreen(lcd_t* lcd, uint8 r, uint8 g, uint8 b);


+ 24
- 98
st7735.c View File

@@ -1,8 +1,8 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "st7735.h"
#include "font8x8_basic.h"

/********************************** EASY PORT *********************************/
/*
@@ -28,9 +28,6 @@ struct
};
/****************************** END EASY PORT END *****************************/

/* The global variable that stores the pointer to the structure,
* with the current active display.
*/
static lcd_t *activeDisplay;

/*
@@ -57,11 +54,10 @@ static inline void *safeMalloc(size_t size)
} /* safeMalloc */


void lcd_setOrientation(uint8 orientation);
void lcd_setGamma(uint8 state);
void lcd_pushPx(uint8 r, uint8 g, uint8 b);
void lcd_pushPixels(uint8* pixels, size_t count);
void lcd_pushChar(char c);
void lcd_setOrientation(lcd_t* lcd, uint8 orientation);
void lcd_setGamma(lcd_t* lcd, uint8 state);
void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b);
void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count);

/*
* Write the command to the display driver.
@@ -72,7 +68,7 @@ void lcd_pushChar(char c);
static inline void writeCommand(uint8 cmd)
{
gpio.digitalWrite(activeDisplay->a0, LOW);
gpio.spiDataRW(activeDisplay->cs, &cmd, 1);
gpio.spiDataRW(activeDisplay->channel, &cmd, 1);
} /* writeCommand */

/*
@@ -84,17 +80,17 @@ static inline void writeCommand(uint8 cmd)
static inline void writeData(uint8 data)
{
gpio.digitalWrite(activeDisplay->a0, HIGH);
gpio.spiDataRW(activeDisplay->cs, &data, 1);
gpio.spiDataRW(activeDisplay->channel, &data, 1);
} /* writeData */

lcd_t *lcd_init(int spiSpeed, int cs, int a0, int rs)
lcd_t *lcd_init(int spiSpeed, int channel, int cs, int a0, int rs)
{
/* Create the one instance of the lcdst_t structure and activate it */
lcd_t *instance = (lcd_t *) safeMalloc(sizeof(lcd_t));
activeDisplay = instance;

/* Assign specific pins */
instance->channel = channel;
instance->cs = cs;
instance->a0 = a0;
instance->rs = rs;
@@ -116,7 +112,7 @@ lcd_t *lcd_init(int spiSpeed, int cs, int a0, int rs)
}
/* Configure the SPI interface */
if(gpio.spiSetup(instance->cs, spiSpeed) == -1)
if(gpio.spiSetup(instance->channel, spiSpeed) == -1)
{
fprintf(stderr, "Failed to setup the SPI interface!\n");
exit(EXIT_FAILURE);
@@ -131,8 +127,8 @@ lcd_t *lcd_init(int spiSpeed, int cs, int a0, int rs)
gpio.delay(150);
/* Set the orientation and the gamma */
lcd_setOrientation(0);
lcd_setGamma(2); /* Optional */
lcd_setOrientation(instance, 0);
lcd_setGamma(instance, 2); /* Optional */
/* Set the pixel format */
writeCommand(0x3A);
@@ -152,7 +148,7 @@ void lcd_deinit(lcd_t *display)
free(display);
} /* lcdst_uninit */

void lcd_setOrientation(uint8 orientation)
void lcd_setOrientation(lcd_t* lcd, uint8 orientation)
{
writeCommand(0x36); /* Memory Data Access Control */

@@ -162,33 +158,33 @@ void lcd_setOrientation(uint8 orientation)
writeData(0x60); /* MX + MV */
activeDisplay->width = 160;
activeDisplay->height = 128;
lcd_setWindow(0, 0, 159, 127);
lcd_setWindow(lcd, 0, 0, 159, 127);
break;

case 2:
writeData(0xC0); /* MY + MX */
activeDisplay->width = 128;
activeDisplay->height = 160;
lcd_setWindow(0, 0, 127, 159);
lcd_setWindow(lcd, 0, 0, 127, 159);
break;

case 3:
writeData(0xA0); /* MY + MV */
activeDisplay->width = 160;
activeDisplay->height = 128;
lcd_setWindow(0, 0, 159, 127);
lcd_setWindow(lcd, 0, 0, 159, 127);
break;

default:
writeData(0x00); /* None */
activeDisplay->width = 128;
activeDisplay->height = 160;
lcd_setWindow(0, 0, 127, 159);
lcd_setWindow(lcd, 0, 0, 127, 159);
break;
}
} /* lcdst_setOrientation */

void lcd_setGamma(uint8 state)
void lcd_setGamma(lcd_t* lcd, uint8 state)
{
/* The status (0 or 1) of the GS pin can only be empirically tested */
switch(state)
@@ -204,13 +200,13 @@ void lcd_setGamma(uint8 state)
writeData(state);
} /* lcdst_setGamma */

void lcd_setInversion(uint8 state)
void lcd_setInversion(lcd_t* lcd, uint8 state)
{
/* Display inversion ON/OFF */
writeCommand(state ? 0x21 : 0x20);
} /* lcdst_setInversion */

uint8 lcd_setWindow(uint8 x1, uint8 y1, uint8 x2, uint8 y2)
uint8 lcd_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2)
{
/* Accept: 0 <= x1 <= x2 < activeDisplay->width */
if(x2 < x1) return 1;
@@ -245,88 +241,18 @@ void lcd_activateRamWrite(void)

uint8 pixel[3];

inline void lcd_pushPx(uint8 r, uint8 g, uint8 b)
inline void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b)
{
gpio.digitalWrite(activeDisplay->a0, HIGH);
pixel[0] = r;
pixel[1] = g;
pixel[2] = b;
gpio.spiDataRW(activeDisplay->cs, pixel, 3);
gpio.spiDataRW(activeDisplay->channel, pixel, 3);
} /* lcdst_pushPx */

void lcd_pushPixels(uint8* pixels, size_t count)
void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count)
{
gpio.digitalWrite(activeDisplay->a0, HIGH);
gpio.spiDataRW(activeDisplay->cs, pixels, count * 3);
}

void lcd_drawPx(uint8 x, uint8 y, uint8 r, uint8 g, uint8 b)
{
if(lcd_setWindow(x, y, x, y)) return;
lcd_pushPx(r, g, b);
} /* lcdst_drawPx */

void lcd_fillRect(uint8 x, uint8 y, uint8 w, uint8 h,
uint8 r, uint8 g, uint8 b)
{
/* Draw only in the display space */
if((w == 0) || (h == 0)) return;
if((x+w-1) >= activeDisplay->width) w = activeDisplay->width - x;
if((y+h-1) >= activeDisplay->height) h = activeDisplay->height - y;
/* Draw the filled rectangle */
if(lcd_setWindow(x, y, x+w-1, y+h-1)) return;

#define BUFFER_PIXELS 64
int wh = w*h;
uint8 buffer[BUFFER_PIXELS * sizeof(uint8) * 3];
for (int p = 0; p < wh; p += BUFFER_PIXELS) {
for(int pb = 0; pb < BUFFER_PIXELS; pb++) {
buffer[pb * 3 + 0] = r;
buffer[pb * 3 + 1] = g;
buffer[pb * 3 + 2] = b;
}
int rem = wh - p;
lcd_pushPixels(buffer, ((rem < BUFFER_PIXELS) ? rem : BUFFER_PIXELS));
}
}

void lcd_fillScreen(uint8 r, uint8 g, uint8 b)
{
/* Fill the whole screen with one color */
lcd_fillRect(0, 0, activeDisplay->width, activeDisplay->height, r, g, b);
} /* lcdst_drawScreen */

void lcd_pushChar(char c)
{
char* bitmap = font8x8_basic[(unsigned int) c];
int x,y;
int set;
int mask;
for (x=0; x < 8; x++) {
for (y=0; y < 8; y++) {
set = bitmap[x] & 1 << y;
printf("%c", set ? 'X' : ' ');
if (set) {
lcd_pushPx(200, 0, 0);
} else {
lcd_pushPx(0, 0, 0);
}
}
printf("\n");
}
}

void lcd_printChar(uint8 x, uint8 y, char c)
{
lcd_setWindow(x, y, x+8 - 1, y+8 - 1);
lcd_pushChar(c);
}

void lcd_printText(uint8 x, uint8 y, char* text)
{
for (int i = 0; i < strlen(text); i++) {
lcd_printChar(x + i * 8, y, text[i]);
}
gpio.spiDataRW(activeDisplay->channel, pixels, count * 3);
}


+ 2
- 98
st7735.h View File

@@ -1,100 +1,4 @@
#ifndef uint8
#define uint8 unsigned char
#endif
typedef struct
{
int cs, a0, rs;
uint8 width, height;
} lcd_t;
#include "spilcd.h"

/*
* Initialize the display and create a data structure for it.
* The last initialized display is active.
*
* Parameters:
* spiSpeed - Speed of the SPI interface.
* cs - Chip selection pin.
* a0 - Data/Command pin.
* rs - Optional reset pin. If you do not use it, enter -1.
*
* Return: Pointer to the structure with display data.
*
*/
lcd_t *lcd_init(int spiSpeed, int cs, int a0, int rs);
// TODO: optional HW-specific functions

/*
* Reset the specified display and clear the previously assigned memory.
*
* Parameters:
* display - Pointer to the structure with display data.
*
* Return: void
*/
void lcd_deinit(lcd_t *display);

/*
* Set the drawing area on the currently active display.
*
* Parameters:
* x1 - The X parameter of the first point.
* y1 - The Y parameter of the first point.
* x2 - The X parameter of the second point.
* y2 - The Y parameter of the second point.
*
* Return: Confirmation of the occurrence or non-occurrence of an error.
* 0 - The error did not occur; 1 - The error occurred.
*
*/
uint8 lcd_setWindow(uint8 x1, uint8 y1, uint8 x2, uint8 y2);

/*
* Draw one pixel on the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* x - The X parameter of the pixel.
* y - The Y parameter of the pixel.
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_drawPx(uint8 x, uint8 y, uint8 r, uint8 g, uint8 b);

/*
* Draw a filled rectangle on the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* x - Parameter X of the upper left corner of the rectangle.
* y - Parameter Y of the upper left corner of the rectangle.
* w - The width of the rectangle.
* h - The height of the rectangle.
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_fillRect(uint8 x, uint8 y, uint8 w, uint8 h, uint8 r, uint8 g, uint8 b);

/*
* Fill the entire screen with one color of the currently active display.
* The color intensity scale for a normal pixel is from 0 to 255.
* The color intensity scale for the reduced pixel is from 0 to 15.
*
* Parameters:
* r - The intensity of the red color.
* g - The intensity of the green color.
* b - The intensity of the blue color.
*
* Return: void
*/
void lcd_fillScreen(uint8 r, uint8 g, uint8 b);

void lcd_printChar(uint8 x, uint8 y, char c);
void lcd_printText(uint8 x, uint8 y, char* text);

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