Template:STM32 Guides for SPI e-Paper

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Hardware connection

The demo codes we provide are based on STM32F103ZET6, the connection table is also based on STM32F103ZET6, if you want to use other chip, you need to port the codes yourself and change the connection according to actual situation.

Connect to STM32F103ZET
e-Paper STM32
Vcc 3.3V
GND GND
DIN PA7
CLK PA5
CS PA4
DC PA2
RST PA1
BUSY PA3
E-paper driver hat to stm32 connet.png

If the STM32 board you have is STM32F103RB, you can refer to the guides of E-Paper Shield

Softawre settings

The codes are based on HAL library. Download the codes and the project files are saved under the STM32\STM32-F103ZET6\MDK-ARM directory.
E-paper stm32 code1.png

Modify main.c, define the line according to the e-paper type and re-compile project and download.
E-paper stm32 code2.png

Supports type

1.02inch(128×80):

EPD_1in02d_test():Example for 1.02inch e-Paper/1.02inch e-Paper Module

1.54inch(1.54inch e-paper c:152×152,others:200×200):

EPD_1in54_test(): Example for 1.54inch e-paper V1(Balck/White): This version is stop production which can be bought before 2019-11-22;
EPD_1in54_V2_test():Example for 1.54inch e-paper V2(Balck/White): This is the current version which can be buy now (2020-07-29). The e-Paper has V2 sticker on the backside.
EPD_1in54b_test(): Example for 1.54inch e-paper B(Black/White/Red);
EPD_1in54c_test(): Example for 1.54inch e-paper C(Black/White/Red);br />

2.7inch(264×176):

EPD_2in7_test(): Example for 2.7inch e-paper(Black/White);
EPD_2in7b_test(): Example for 2.7inch e-paper B(Black.White/Red);

2.9inch(296×128):

EPD_2in9_test(): Example for 2.9inch e-paper(Black/White);
EPD_2in9bc_test(): Example for 2.9inch e-paper B(Balck/White/Red) and 2.9inch e-paper C(Black/White/Yellow);
EPD_2in9d_test(): Example for 2.9inch e-paper D(Black/White);

2.13inch(2.13inch e-Paper:250×122,others:212×104)

EPD_2in13_test(): Example for 2.13inch e-paper V1(Black/White), this version is stop production and it can be bought before 019-05-15;
EPD_2in13_V2_test():Example for 2.13inch e-paper V2(Black/White) This is the current version with sticker V2 on the backside (2020-07-29);
EPD_2in13bc_test():Example for 2.13inch e-paper B(Black/White/Red)and 2.13inch e-paper C(Blackj/White/Yellow);
EPD_2in13d_test(): Example for 2.13inch e-paper D(Black/White);

4.01inch(640×400)

EPD_4in01f_test(): Example for 4.01inch e-paper HAT (F)(Seven-color);

4.2inch(400×300)

EPD_4in2_test(): Example for 4.2inch e-paper(Black/White);
EPD_4in2bc_test(): Example for 4.2inch e-paper B(Black/White/Red);

5.65inch (600x448)

EPD_5in65f_test(): Example for for 5.65inch e-Paper F (Seven-color);

5.83inch(600×448):

EPD_5in83_test(): Example for 5.83inch e-paper(Black/White);
EPD_5in83bc_test(): Example for 5.83inch e-paper B(Black/White/Red)and 5.83inch e-paper C(Black/White/Yellow);

7.5inch(V1:640×384,V2:800×480):

EPD_7in5_test(): Example for 7.5inch e-paper(Black/White), this version is stop production and it can be bought before 2019-12-07;
EPD_7in5bc_test(): Example for 7.5inch e-paper B(Black/White/Red)and 7.5inch e-paper C(Black/White/Yellow),7.5inch e-paper B V1 version is stop production and it can be bought before 2019-12-07;
EPD_7in5_V2_test(): Example for 7.5inch e-paper V2(Black/White), This is the current version with V2 sticker on the backside (2020-07-29)
EPD_7in5bc_V2_test():Example for 7.5inch e-paper B V2(Black/White/Red); This is the current version with V2 sticker on the backside. (2020-07-29);

Codes description

Bottom hardware interface

We package the bottom for different hardware platforms.
You can check the DEV_Config.c(.h) file which is located in \STM32\STM32-F103ZET6\User\Config

  • Data type:
#define UBYTE   uint8_t
#define UWORD   uint16_t
#define UDOUBLE uint32_t
  • Module initialized and exit:
void DEV_Module_Init(void);
void DEV_Module_Exit(void);

Note: 1.The functions are used to set GPIP before and after driving e-Paper.
2..If the board you have is printed with Rev2.1, the module enters low-ultra mode after DEV_Module_Exit(). (as we test, the current is about 0 in this mode);

  • GPIO Read/Write:
void DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE DEV_Digital_Read(UWORD Pin);
  • SPI Write data
void DEV_SPI_WriteByte(UBYTE Value);

Middle EPD driver

The epd driver are saved in: STM32\STM32-F103ZET6\User\e-Paper
Open .h file, functions are declarated here

  • Initialization: It should be used to initialize e-Paper or wakeup e-Paper from sleep mode.
//1.54inch e-Paper、1.54inch e-Paper V2、2.13inch e-Paper、2.13inch e-Paper  V2、2.13inch e-Paper (D)、2.9inch e-Paper、2.9inch e-Paper (D)
void EPD_xxx_Init(UBYTE Mode); //ode = 0 Initialize full refresh; Mode = 1 Initilize partial refresh 
//Other type
void EPD_xxx_Init(void);

xxx is the type of e-paper

  • Clear display: This function is used to clear the e-paper to white
void EPD_xxx_Clear(void); 

xxx is the type of e-Paper.

  • Transmit a frame of image and display
//Black/White e-Paper
void EPD_xxx_Display(UBYTE *Image);
Because controllers of 1.54inch e-paper V2 and 2.13inch e-paper V2 were updated, you need to use EPD_xxx_DisplayPartBaseImage to display static image and ten use EPD_xxx_displayPart() to dymatic display when partial refreshing.
void EPD_2IN13_V2_DisplayPart(UBYTE *Image);
void EPD_2IN13_V2_DisplayPartBaseImage(UBYTE *Image);
  • Enter sleep mode
void EPD_xxx_Sleep(void);

Note, You should hardware reset or use initialize function to wake up e-Paper from sleep mode
xxx is the type of e-Paper

Application function

Basic drawing functions are provided here. You can find they in:\STM32\STM32-F103ZET6\User\GUI\GUI_Paint.c(.h)

The fonts are saved in the directory:\STM32\STM32-F103ZET6\User\Fonts

  • Create a new image buffer: This function is used to create a new image with width, height, Rotate degree and its color.
void Paint_NewImage(UBYTE *image, UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameter:
 	image: The buffer of the image, this is a pointer of buffer address;
 	Width: width of the image;
 	Height: Height of the image;
 	Rotate: Rotate degree;
 	Color: Initial color of the image;
  • Select image buffer: this function is used to select the image buffer. You can create multiple image buffers with the last function, then select the buffer for every image.
void Paint_SelectImage(UBYTE *image)
Parameter:
 	image: The name of image buffer, it is a pointer of buffer address;
  • Set display orientation: This function is used to set the rotate degree, it is generally be used after Paint_SelectImage(). You can set the rotate degree to 0、90、180、270 degree.
void Paint_SetRotate(UWORD Rotate)
Parameter:
 	Rotate: Rotate degree, you can choose ROTATE_0、ROTATE_90、ROTATE_180、ROTATE_270 which stands for 0、90、180、270 degree repetitively.
SPI-epaper-C-0.pngSPI-epaper-C-90.pngSPI-epaper-C-180.pngSPI-epaper-C-270.png
  • Image mirroring: This function is used to mirror image.
void Paint_SetMirroring(UBYTE mirror)
Parameter:
 	mirror: You can set it to MIRROR_NONE、MIRROR_HORIZONTAL、MIRROR_VERTICAL、MIRROR_ORIGIN
  • Set pixel: this function is used to set the position and color of pixels in the buffer. This is the basic function of GUI.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameter:
 	Xpoint: X-axes in the buffer;
 	Ypoint: Y-axes in buffer;
 	Color: color
  • Clear: This function is used to clear the screen to certain color.
void Paint_Clear(UWORD Color)
Parameter:
 	Color: 
  • Clear windows: this function is used to clear a window. It is generally used for time display.
void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameter:
 	Xstart: Start coordinate of X-axes of the window;
 	Ystart: Start coordinate of Y-axes of the window;
 	Xend: End coordinate of X-axes of the window;
 	Yend: End coordinate of Y-axes of the window;
 	Color:
  • Draw point: Draw a point on the position (Xpoint, Ypoint)in buffer
void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameter:
 	Xpoint: X coordinate of point;
 	Ypoint: Y coordinate of point;
 	Color: color of point;
 	Dot_Pixel: the size of point, there are 8 sizes available;
 	 	 typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  , 	 	// 3 X 3
 	 	 	 DOT_PIXEL_4X4  , 	 	// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Dot_Style: style of point. 
 	 	typedef enum {
 	 	   DOT_FILL_AROUND  = 1,		
 	 	   DOT_FILL_RIGHTUP,
 	 	} DOT_STYLE;
  • Draw line: draw a line for (Xstart, Ystart) to (Xend, Yend)
void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style , LINE_STYLE Line_Style)
Parameter:
 	Xstart: Start coordinate of X-axes of line;
 	Ystart: Start coordinate of Y-axes of line;
 	Xend: End coordinate of X-axes of line;
 	Yend: End coordinate of Y-axes of line
 	Color:
 	Line_width: the width of line, 8 sizes are avalilable;
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	 Line_Style: Style of the line;
 	 	typedef enum {
 	 	 	 LINE_STYLE_SOLID = 0,
 	 	 	 LINE_STYLE_DOTTED,
 	 	} LINE_STYLE;
  • Draw rectangle: Draw a rectangle from (Xstart, Ystart) to (Xend, Yend).
void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameter:
 	Xstart: Start coordinate of X-axes of rectangle
 	Ystart: Start coordinate of Y-axes of rectangle
 	Xend: End coordinate of X-end of rectangle
 	Yend: End coordinate of Y-end of rectangle
 	Color: color of rectangle
 	Line_width: The width of edges, 8 sides are available;
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Draw_Fill: set the rectangle full or empty.
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;
  • Draw circle:Draw a circle, use (X_Center Y_Center) as center;
void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameter:
 	X_Center: X coordinate of center
 	Y_Center: Y coordinate of center
 	Radius:Radius of circle
 	Color: color of circle
 	Line_width: width of circle, 8 sizes are avalilable
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Draw_Fill: style of circle
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;
  • Draw character (ASCII): Set(Xstart Ystart) as letf-top point, draw a ASCII character.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameter:
 	Xstart: X coordinate of left-top pixel of character;
 	Ystart: Y coordinate of left-top pixel of character;
 	Ascii_Char:Ascii character;
 	Font: 5 fonts are available;
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: color of character;
 	Color_Background: color of background;
  • Draw String: Set point (Xstart Ystart) as the left-top pixel, draw a string.
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameter:
 	Xstart: X coordinate of left-top pixel of characters;
 	Ystart: Y coordinate of left-top pixel of characters;
 	pString:Pointer of string
 	Font: 5 fonts are available:
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: color of string
 	Color_Background: color of background
  • Draw Chinese charactgers: this function is used to draw Chinese fonts based ON GB2312 fonts.
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground, UWORD Color_Background)
Parameter:
 	Xstart: Coordinate of left-top pixel of characters;
 	Ystart: Coordinate of left-top pixel of characters;
 	pString:Pointer of string
 	Font: GB2312 fonts
 	 	font12CN:11*21(ascii),16*21 (Chinese)
 	 	font24CN:24*41(ascii),32*41 (Chinese)
 	Color_Foreground: color of string
 	Color_Background: color of background
  • Draw number: Draw a string of numbers, (Xstart, Ystart) is the left-top pixel.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, int32_t Nummber, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameter:
 	Xstart: X coordinate of left-top pixel;
 	Ystart: Y coordicate of left-to pixel;
 	Nummber:the numbers displayed. the numbers are saved in int format, the maximum is 2147483647;
 	Font: 5 fonts are available:
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: color of font;
 	Color_Background: color of background;
  • Display time:Display time, (Xstart, Ystart) is the left-top pixel. This function is used for e-Paper which supports partial refresh
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background, UWORD Color_Foreground)
Parameter:
 	Xstart: X coordinate of left-top pixel of character;
 	Ystart: Y coordinate of left-top pixel of character;
 	pTime:Pointer of time displayed;
 	Font: 5 fonts are available;
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: color of fonts
 	Color_Background: color of background
  • Draw image:send image data of bmp file to buffer
void Paint_DrawBitMap(const unsigned char* image_buffer)
Parameter:
 	image_buffer: adrress of image data in buffer