This is library for PCD8544 LCD controller. This lcd has been used in Nokia 5110/3310 phones. They are almost free on Ebay and are nice size to be used in your projects.
Features
- Resolution 84 x 48px
- Display string
- 2 font sizes 5 x 7 and 3 x 5
- Graphic library for lines, rectangles and circles
- algorithm to update only changed area of display to increase speed
- driven with SPI
- Software selectable contrast
Connection to Discovery board
| LCD board | Discovery | Description |
|---|---|---|
| RST | PC15 | Reset pin for LCD |
| CE | PC13 | Chip enable for SPI2 |
| DC | PC14 | Data/Command pin |
| DIN | PC3 | MOSI pin for SPI2 |
| CLK | PB10 | CLOCK pin for SPI2 |
| VCC | 3.3V | VCC Power |
| LIGHT | GND | If you connect this to GND, backlight is turned on |
| GND | GND | Ground |
Enums
Here are listed public enums, which are used in public functions:
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/** * Used for pixel "color" * LCD is 1 bit, so pixel can be just set or clear */ typedef enum { PCD8544_Pixel_Clear = 0, PCD8544_Pixel_Set = !PCD8544_Pixel_Clear } PCD8544_Pixel_t; /** * Font size for text * There are 2 sizes included */ typedef enum { PCD8544_FontSize_5x7 = 0, PCD8544_FontSize_3x5 = !PCD8544_FontSize_5x7 } PCD8544_FontSize_t; /** * Used to invert pixels */ typedef enum { PCD8544_Invert_Yes, PCD8544_Invert_No } PCD8544_Invert_t; |
Functions
Only public functions are described here
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/** * Initialize LCD * * Parameters * - unsigned char contrast: Contrast can be software selectable, from 0x00 to 0x7F */ extern void PCD8544_Init(unsigned char contrast); /** * Set contrast for LCD * * Parameters * - unsigned char contrast: Contrast can be software selectable, from 0x00 to 0x7F */ extern void PCD8544_SetContrast(unsigned char contrast); /** * Invert LCD * * Parameters * - PCD8544_Invert_t invert * - PCD8544_Invert_Yes: Invert pixels on lcd * - PCD8544_Invert_No: Return pixels to orignal */ extern void PCD8544_Invert(PCD8544_Invert_t invert); /** * Clear lcd */ extern void PCD8544_Clear(void); /** * Set/clear pixel at specific location * * Parameters * - unsigned char x: x position of pixel * - unsigned char y: y position of pixel * - PCD8544_PCD8544_Pixel_t pixel: Set or clear pixel * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawPixel(unsigned char x, unsigned char y, PCD8544_Pixel_t pixel); /** * Set cursor on lcd at 0, 0 location */ extern void PCD8544_Home(void); /** * Put data from internal buffer to lcd */ extern void PCD8544_Refresh(void); /** * Set cursor to desired position * * Parameters: * - unsigned char x: x from 0 to 83 * - unsigned char y: y from 0 to 47 */ extern void PCD8544_GotoXY(unsigned char x, unsigned char y); /** * Put character on LCD * * Parameters: * - char c: char to display * - PCD8544_FontSize_t size: Font size * - PCD8544_FontSize_5x7 * - PCD8544_FontSize_3x5 * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_Putc(char c, PCD8544_Pixel_t color, PCD8544_FontSize_t size); /** * Put string on LCD * * Parameters: * - char *c: pointer to first character of string * - PCD8544_FontSize_t size: Font size * - PCD8544_FontSize_5x7 * - PCD8544_FontSize_3x5 * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_Puts(char *c, PCD8544_Pixel_t color, PCD8544_FontSize_t size); /** * Draw line on LCD * * Parameters: * - unsigned char x0: X coordinate of starting point * - unsigned char y0: Y coordinate of starting point * - unsigned char x1: X coordinate of ending point * - unsigned char y1: Y coordinate of ending point * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawLine(unsigned char x0, unsigned char y0, unsigned char x1, unsigned char y1, PCD8544_Pixel_t color); /** * Draw rectangle on LCD * * Parameters: * - unsigned char x0: X coordinate of top left point * - unsigned char y0: Y coordinate of top left point * - unsigned char x1: X coordinate of bottom right point * - unsigned char y1: Y coordinate of bottom right point * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawRectangle(unsigned char x0, unsigned char y0, unsigned char x1, unsigned char y1, PCD8544_Pixel_t color); /** * Draw filled rectangle on LCD * * Parameters: * - unsigned char x0: X coordinate of top left point * - unsigned char y0: Y coordinate of top left point * - unsigned char x1: X coordinate of bottom right point * - unsigned char y1: Y coordinate of bottom right point * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawFilledRectangle(unsigned char x0, unsigned char y0, unsigned char x1, unsigned char y1, PCD8544_Pixel_t color); /** * Draw circle on LCD * * Parameters: * - char x0: X coordinate of center circle point * - char y0: Y coordinate of center circle point * - char r: circle radius * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawCircle(char x0, char y0, char r, PCD8544_Pixel_t color); /** * Draw filled circle on LCD * * Parameters: * - char x0: X coordinate of center circle point * - char y0: Y coordinate of center circle point * - char r: circle radius * - PCD8544_PCD8544_Pixel_t color * - PCD8544_Pixel_Set * - PCD8544_Pixel_Clear */ extern void PCD8544_DrawFilledCircle(char x0, char y0, char r, PCD8544_Pixel_t color); |
Example
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/** * PCD8544 LCD controller driver example * * @author Tilen Majerle * @email tilen@majerle.eu * @website http://stm32f4-discovery.net * @ide Keil uVision */ #include "defines.h" #include "stm32f4xx.h" #include "tm_stm32f4_pcd8544.h" int main(void) { //180MHz SystemInit(); //Initialize LCD with 0x38 software contrast PCD8544_Init(0x38); //Go to x=14, y=3 position PCD8544_GotoXY(14, 3); //Print data with Pixel Set mode and Fontsize of 5x7px PCD8544_Puts("STM32F429", PCD8544_Pixel_Set, PCD8544_FontSize_5x7); PCD8544_GotoXY(15, 13); PCD8544_Puts("Discovery", PCD8544_Pixel_Set, PCD8544_FontSize_5x7); PCD8544_GotoXY(30, 26); PCD8544_Puts("2014", PCD8544_Pixel_Set, PCD8544_FontSize_5x7); PCD8544_GotoXY(45, 42); //Put string with Pixel set mode and Fontsize of 3x5 PCD8544_Puts("majerle.eu", PCD8544_Pixel_Set, PCD8544_FontSize_3x5); //Display data on LCD PCD8544_Refresh(); while (1) { } } |
Result
Upload code to discovery board. If you did everything correct, then something similar to image on the left should be displayed.
Project is available on Github, download library below.
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