[SOLVED] Problem displaying 320*240 image from SD card

This site uses cookies. By continuing to browse this site, you are agreeing to our Cookie Policy.

  • [SOLVED] Problem displaying 320*240 image from SD card

    Hi,

    I am working on displaying images from external memory. I am having problems displaying the complete picture. I can display image up until 170*240, after which when I try to expand x value I see white background and nothing else on the LCD.
    Please see the below code and image attached with this thread.
    Could someone tell me what I could be doing wrong?

    P.S: I have tried displaying images on buttons using the same functions and it works.


    C Source Code

    1. /*********************************************************************
    2. * *
    3. * SEGGER Microcontroller GmbH *
    4. * Solutions for real time microcontroller applications *
    5. * *
    6. **********************************************************************
    7. * *
    8. * C-file generated by: *
    9. * *
    10. * GUI_Builder for emWin version 5.48 *
    11. * Compiled Jun 13 2018, 10:51:02 *
    12. * (c) 2018 Segger Microcontroller GmbH *
    13. * *
    14. **********************************************************************
    15. * *
    16. * Internet: www.segger.com Support: support@segger.com *
    17. * *
    18. **********************************************************************
    19. */
    21. // USER START (Optionally insert additional includes)
    22. // USER END
    24. #include "project.h"
    25. #include <stddef.h>
    26. #include <string.h>
    27. #include "WIDGET.h"
    28. #include "WM.h"
    29. #include "BUTTON.h"
    30. #include "DIALOG.h"
    31. #include "FS.h"
    33. /*********************************************************************
    34. *
    35. * Defines
    36. *
    37. **********************************************************************
    38. */
    39. #define ID_WINDOW_0 (GUI_ID_USER + 0x00)
    40. #define RECOMMENDED_MEMORY (1024L * 5)
    41. //extern void _OnPaint();
    42. //extern void DrawDTA();
    44. // USER START (Optionally insert additional defines)
    45. // USER END
    47. /*********************************************************************
    48. *
    49. * Static data
    50. *
    51. **********************************************************************
    52. */
    54. // USER START (Optionally insert additional static data)
    55. // USER END
    57. /*********************************************************************
    58. *
    59. * _aDialogCreate
    60. */
    61. static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = {
    62. { WINDOW_CreateIndirect, "Window", ID_WINDOW_0, 0, 0, 320, 240, 0, 0x0, 0 },
    63. { IMAGE_CreateIndirect, "SplashScreen", GUI_ID_IMAGE0, 0, 0, 320, 240, 0, 0x0, 0 },
    64. // USER START (Optionally insert additional widgets)
    65. // USER END
    66. };
    68. /*********************************************************************
    69. *
    70. * Static code
    71. *
    72. **********************************************************************
    73. */
    74. int APP_GetDataBMP(void * p, const U8 ** ppData, unsigned NumBytes, U32 Off)
    75. {
    76. static U8 acBuffer[512];
    78. FS_FILE * pFile;
    79. int NumBytesRead;
    81. pFile = (FS_FILE *)p;
    82. //
    83. // Check buffer size
    84. //
    85. if (NumBytes > sizeof(acBuffer))
    86. {
    87. NumBytes = sizeof(acBuffer);
    89. }
    90. //
    91. // Set file pointer to the required position
    92. //
    93. FS_SetFilePos(pFile, Off, FS_FILE_BEGIN);
    94. //
    95. // Read data into buffer
    96. //
    97. NumBytesRead = FS_FRead(acBuffer, 1, NumBytes, pFile);
    98. //
    99. // Set data pointer to the beginning of the buffer
    100. //
    101. *ppData = (const U8 *)acBuffer;
    102. //
    103. // Return number of available bytes
    104. //
    105. return NumBytesRead;
    107. }
    110. /*********************************************************************
    111. *
    112. * MainTask
    113. */
    114. void _OnPaint(const char * filename)
    115. {
    116. FS_FILE * pFile;
    117. char acVolumeName[10];
    118. //
    119. // Enable long file name support
    120. //
    121. FS_FAT_SupportLFN();
    122. //
    123. // Mount volume
    124. //
    125. FS_GetVolumeName(0, acVolumeName, sizeof(acVolumeName));
    127. if (FS_Mount(acVolumeName) > 0)
    128. {
    129. //
    130. // Open file
    131. //
    132. pFile = FS_FOpen(filename, "rb");
    134. }
    135. //
    136. // Draw the bmp image by passing a pointer to the file handle and the GetData function
    137. //
    138. GUI_BMP_DrawEx(APP_GetDataBMP, pFile,0, 0);
    139. //
    140. // Close file
    141. //
    142. FS_FClose(pFile);
    144. }
    145. static void _cbDrawSplashScreen(WM_MESSAGE * pMsg)
    146. {
    147. switch (pMsg->MsgId)
    148. {
    149. case WM_PAINT:
    151. _OnPaint("Tree.dta");
    153. // USER START (Optionally insert additional message handling)
    154. // USER END
    155. break;
    156. default:
    157. IMAGE_Callback(pMsg);
    158. break;
    159. }
    160. }
    161. // USER START (Optionally insert additional static code)
    162. // USER END
    164. /*********************************************************************
    165. *
    166. * _cbDialog
    167. */
    168. static void _cbDialog(WM_MESSAGE * pMsg)
    169. {
    170. WM_HWIN hItem;
    171. IMAGE_Handle hImage;
    172. hItem = pMsg -> hWin;
    173. switch (pMsg->MsgId)
    174. {
    176. case WM_INIT_DIALOG:
    178. hImage = WM_GetDialogItem(pMsg -> hWin,GUI_ID_IMAGE0);
    179. WM_SetCallback(hImage, _cbDrawSplashScreen);
    182. // USER START (Optionally insert additional message handling)
    183. // USER END
    184. break;
    185. default:
    186. WM_DefaultProc(pMsg);
    187. }
    188. }
    190. /*********************************************************************
    191. *
    192. * Public code
    193. *
    194. **********************************************************************
    195. */
    196. /*********************************************************************
    197. *
    198. * CreateWindow
    199. */
    200. void CreateSplashScreen(void)
    201. {
    202. //
    203. // Check if recommended memory for the sample is available
    204. //
    205. if (GUI_ALLOC_GetNumFreeBytes() < RECOMMENDED_MEMORY)
    206. {
    207. GUI_ErrorOut("Not enough memory available.");
    208. return;
    209. }
    210. //
    211. // Use memory devices for all windows
    212. //
    213. #if GUI_SUPPORT_MEMDEV
    214. WM_SetCreateFlags(WM_CF_MEMDEV);
    215. WM_EnableMemdev(WM_HBKWIN);
    216. #endif
    217. WM_SetDesktopColor(GUI_BLACK);
    218. while(1)
    219. {
    220. GUI_ExecDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), &_cbDialog, 0, 0, 0);
    221. GUI_Delay(10);
    222. }
    224. }
    226. // USER START (Optionally insert additional public code)
    227. // USER END
    229. /*************************** End of file ****************************/
    Display All
    Thanks and regards,
    BMD
    Files

    • Tree.bmp

      (230.45 kB, downloaded 345 times, last: )

  • Florian/Sven,

    Could you please help me understand this behavior? I tried different things but nothing seems to work.
    I am trying to display 320x240 Image from SD card on the 320x240 LCD and I can see Image only when the x value is <= 170 and y = 240. Any value above 170 shows blank screen.
    I have been using the same code to display images on buttons and it works well but those are very small images. If you could please check/ help me understand where I could be going wrong, that would really help me a lot.

    Looking forward to hear from you.

    Best regards,
    BMD

  • Okay, so I just found out that images of larger sizes are the problem. I am compressing the images before i convert them using bitmap converter but no matter how small the image size is before conversion to .bmp/.dta, at the end of conversion the sizes of images are more than 200kB. Is there a way to convert images to lower size using bitmap converter?

    Regards,
    BMD

  • I finally figured it out. The problem was I wasn't allocating enough memory.
    Solution:

    1. Increased the memory allocation in GUIConf.c - #define GUI_NUMBYTES 0x4000 ( i increased it from 2000 to 4000).
    2. Increased the buffer size in Getdata function.


    Best regards,
    BMD