Module: Epaper

Defined in:
lib/epaper.rb,
lib/epaper/version.rb,
ext/epaper/epaper.c

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"0.1.3"

Class Method Summary collapse

Class Method Details

.display_image(file_name:) ⇒ Object 



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/epaper.rb', line 12

def display_image(file_name:)
  Epaper.init

  image = Magick::ImageList.new(file_name)

  image.flop!
  image.scale!(800, 480)
  image.rotate!(180)

  # check and convert if not bmp
  blob = image.to_blob.each_byte.map { |byte| byte ^ 255 }.pack('C*')

  start =  blob.length - 48_000

  Epaper.render_image(blob[start..])
end

.exit ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
 
# File 'ext/epaper/epaper.c', line 34

VALUE rb_epd_exit() {
  printf("Clear...\r\n");
  EPD_7IN5_V2_Clear();

  printf("Goto Sleep...\r\n");
  EPD_7IN5_V2_Sleep();

  DEV_Delay_ms(2000);//important, at least 2s

  DEV_Module_Exit();

  return Qnil;
}

.init ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'ext/epaper/epaper.c', line 17

VALUE rb_epd_init() {
  signal(SIGINT, Handler);

  printf("EPD_7IN5_V2_test Demo\r\n");
  if(DEV_Module_Init()!=0){
      return -1;
  }

  printf("e-Paper Init and Clear...\r\n");
  EPD_7IN5_V2_Init();

  EPD_7IN5_V2_Clear();
  DEV_Delay_ms(500);

  return Qnil;
}

.render_image(img) ⇒ Object 



48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'ext/epaper/epaper.c', line 48

VALUE rb_epd_render_image(VALUE self, VALUE img)
{
  //Create a new image cache
  UBYTE *BlackImage;
  /* you have to edit the startup_stm32fxxx.s file and set a big enough heap size */
  UWORD Imagesize = ((EPD_7IN5_V2_WIDTH % 8 == 0)? (EPD_7IN5_V2_WIDTH / 8 ): (EPD_7IN5_V2_WIDTH / 8 + 1)) * EPD_7IN5_V2_HEIGHT;
  if((BlackImage = (UBYTE *)malloc(Imagesize)) == NULL) {
      printf("Failed to apply for black memory...\r\n");
      return -1;
  }

  printf("Paint_NewImage\r\n");
  Paint_NewImage(BlackImage, EPD_7IN5_V2_WIDTH, EPD_7IN5_V2_HEIGHT, 0, WHITE);

  printf("show image for array\r\n");
  Paint_SelectImage(BlackImage);
  Paint_Clear(WHITE);

  Paint_DrawBitMap(StringValuePtr(img));

  EPD_7IN5_V2_Display(BlackImage);
  DEV_Delay_ms(2000);

  free(BlackImage);
  BlackImage = NULL;
}