- void EPD_1IN54_Init(u8 Mode)
- {
- u16 i;
- EPD_1IN54_Reset();
- EPD_1IN54_SendCommand(0x01);
- EPD_1IN54_SendData((EPD_1IN54_HEIGHT - 1) & 0xFF);
- EPD_1IN54_SendData(((EPD_1IN54_HEIGHT - 1) >> 8) & 0xFF);
- EPD_1IN54_SendData(0x00);
- EPD_1IN54_SendCommand(0x0C);
- EPD_1IN54_SendData(0xD7);
- EPD_1IN54_SendData(0xD6);
- EPD_1IN54_SendData(0x9D);
- EPD_1IN54_SendCommand(0x2C);
- EPD_1IN54_SendData(0xA8);
- EPD_1IN54_SendCommand(0x3A);
- EPD_1IN54_SendData(0x1A);
- EPD_1IN54_SendCommand(0x3B);
- EPD_1IN54_SendData(0x08);
- EPD_1IN54_SendCommand(0x11);
- EPD_1IN54_SendData(0x03);
- EPD_1IN54_SendCommand(0x32);
- if(Mode == EPD_1IN54_FULL){
- for ( i = 0; i < 30; i++) {
- EPD_1IN54_SendData(EPD_1IN54_lut_full_update[i]);
- }
- }else if(Mode == EPD_1IN54_PART){
- for ( i = 0; i < 30; i++) {
- EPD_1IN54_SendData(EPD_1IN54_lut_partial_update[i]);
- }
- }else{
-
- }
- }
开启墨水屏显示的函数为：
- void EPD_1IN54_TurnOnDisplay(void)
- {
- EPD_1IN54_SendCommand(0x22);
- EPD_1IN54_SendData(0xC4);
- EPD_1IN54_SendCommand(0x20);
- EPD_1IN54_SendCommand(0xFF);
- EPD_1IN54_ReadBusy();
- }
至此，前面的努力是否会奏效呢？
方法就是先去验证一下，如果无效，恐怕前面的工作就算交学费。
怎么验证呢？
用清屏函数，通常情况下清屏函数是为清除屏幕内容服务的，这里是反其道而行之，就是让它在屏上留下一些痕迹来判别驱动程序是是否有效。
为此，需将清屏函数改造为一个绘制直线的函数，其内容如下：
- void EPD_1IN54_Clear(void)
- {
- u16 Width, Height,i,j;
- Width = (EPD_1IN54_WIDTH%8== 0)? (EPD_1IN54_WIDTH/8):(EPD_1IN54_WIDTH/8+1);
- Height = EPD_1IN54_HEIGHT;
- EPD_1IN54_SetWindow(0, 0, EPD_1IN54_WIDTH, EPD_1IN54_HEIGHT);
- for (j = 0; j < Height; j++) {
- EPD_1IN54_SetCursor(0, j);
- EPD_1IN54_SendCommand(0x24);
- for (i = 0; i < Width; i++) {
- EPD_1IN54_SendData(0XFE);
- }
- }
- EPD_1IN54_TurnOnDisplay();
- }
经程序的编译与下载，其运行效果如图2所示。这说明驱动是有效的，前期的工作没白费!
图2 绘制直线
有了清屏函数的基础，只需将固定的清屏数据改为图像数据就可以显示图片了。此外，在显示图像时还需选取绘图模式，其函数为：
- void Paint_SelectImage(u8 *image)
- {
- Paint.Image = image;
- }
进行图像绘制的函数为：
- void Paint_DrawBitMap(const unsigned char* image_buffer)
- {
- unsigned short int x, y;
- u32 Addr = 0;
- for (y = 0; y < Paint.HeightByte; y++) {
- for (x = 0; x < Paint.WidthByte; x++) {
- Addr = x + y * Paint.WidthByte;
- Paint.Image[Addr] = (unsigned char)image_buffer[Addr];
- }
- }
- }
在配以主程序的情况下，即可进行显示图片的测试，其主程序的内容为：
- u8 BlackImage[5000];
- int main(void) {
- EPD_CLK_init();
- EPD_MOSI_init();
- EPD_RST_init();
- EPD_DC_init();
- EPD_CS_init();
- SetDigitalInput();
- SetPullUp();
- DEV_Module_Init();
- EPD_1IN54_Init(EPD_1IN54_FULL);
- //EPD_1IN54_Clear();
- Paint_NewImage(BlackImage, EPD_1IN54_WIDTH, EPD_1IN54_HEIGHT, 270, WHITE);
- Paint_SelectImage(BlackImage);
- Paint_DrawBitMap(gImage_1in54);
- EPD_1IN54_Display(BlackImage);
- DEV_Delay_ms(2000);
- EPD_1IN54_Sleep();
- DEV_Delay_ms(2000);
- while(1);
- }
经编译下载，其测试效果就是图1的显示内容，证明绘图函数也成功了！
在添加图形绘制函数的情况下，可绘制点、直线、矩形及圆等并可以进行填充处理。此外，在配置字库的条件下，可实现字符和中文的显示，其实现的效果如图3和图4所示。
图3 绘制图形
图4 显示字符及数值
实现显示效果的主程序为：
- int main(void) {
- EPD_CLK_init();
- EPD_MOSI_init();
- EPD_RST_init();
- EPD_DC_init();
- EPD_CS_init();
- SetDigitalInput();
- SetPullUp();
- DEV_Module_Init();
- EPD_1IN54_Init(EPD_1IN54_FULL);
- Paint_NewImage(BlackImage, EPD_1IN54_WIDTH, EPD_1IN54_HEIGHT, 270, WHITE);
- Paint_SelectImage(BlackImage);
- Paint_DrawBitMap(gImage_1in54);
- Paint_Clear(WHITE);
- Paint_DrawPoint(5, 10, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
- Paint_DrawPoint(5, 25, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
- Paint_DrawPoint(5, 40, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
- Paint_DrawPoint(5, 55, WHITE, DOT_PIXEL_4X4, DOT_STYLE_DFT);
-
- Paint_DrawLine(20, 10, 70, 60, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
- Paint_DrawLine(70, 10, 20, 60, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
- Paint_DrawLine(170, 15, 170, 55, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
- Paint_DrawLine(150, 35, 190, 35, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
-
- Paint_DrawRectangle(20, 10, 70, 60, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
- Paint_DrawRectangle(85, 10, 130, 60, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
- Paint_DrawCircle(170, 35, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
- Paint_DrawCircle(170, 85, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
-
- EPD_1IN54_Display(BlackImage);
- DEV_Delay_ms(2000);
- EPD_1IN54_Sleep();
- DEV_Delay_ms(2000);
- while(1);
- }
这样在PIC的产品上，墨水屏也可以焕发出光彩了！
楼主
