NanoComputer Picture SlideShow Application Reference Design

From NanoComputerWiki

Contents 1 Overview 2 Installation 3 Source Code 4 Known Issues 5 NanoComputer Application Source Code Listing 6 Navigation

Overview

This page contains a simple reference design for a NanoComputer application which displays a slideshow of pictures. The application loads the NanoSlideShow.config file and parses it. The config file should contain a list of filenames of pictures delimited by \r\n. For example

Balloon.pic
Bird.pic
Cow.pic
Landscape.pic

To exit, the application, press and hold any key on the keypad for 2 seconds.

Installation

Hint: You may need to right click on the links below and select "Save As"

NanoComputer Application: NanoSlideShow.ihx
Config File: NanoSlideShow.config
Picture: Balloon.pic
Picture: Bird.pic
Picture: Cow.pic
Picture: Landscape.pic

1. Install the NanoSlideShow application onto the NanoComputer
2. Upload the NanoSlideShow.config file onto the NanoComputer
3. Upload the Balloon.pic file onto the NanoComputer
4. Upload the Bird.pic file onto the NanoComputer
5. Upload the Cow.pic file onto the NanoComputer
6. Upload the Landscape.pic file onto the NanoComputer

Source Code

The source code for the NanoComputer Application is available for download here

NanoSlideShowSource.zip

The NanoComputer SDK was used to build the NanoComputer application.

Known Issues

None

NanoComputer Application Source Code Listing

// --------------------------------------------------
//  Includes                                          
// --------------------------------------------------
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "NanoComputer.h"    
    #include "PICTURE.h"

// --------------------------------------------------
//  Defines
// --------------------------------------------------
    #define E_NO_MORE_DATA -100

// --------------------------------------------------
//  Functions
// --------------------------------------------------
    char ReadNextLineFromFile(NCFS_FileHandle *FileHandle, long* Offset, char* Buf) {
        // Variables
            unsigned short chunkSize;
            char*          pBuf;
            char           retVal;
            
        // Compute chunkSize
            chunkSize = 0x100;
            if (chunkSize > (FileHandle->Header.Size - *Offset)) chunkSize = FileHandle->Header.Size - *Offset;
                    
        // Read in a chunk
            memset(Buf, 0x00, 0x100);
            retVal = NCFS_ReadFile(FileHandle, *Offset, chunkSize, Buf);
            if (retVal != E_OK) return retVal;
            
        // Replace \r\n with 0x00 if \r\n found
            pBuf = strstr(Buf, "\r\n");
            if (pBuf) *pBuf = 0x00;
            
        // Increment the offset
            *Offset = *Offset + strlen(Buf) + 2;
            
        // Check if no more data
            if (*Offset > FileHandle->Header.Size) return E_NO_MORE_DATA;
            
        // Success!
            return E_OK;
    }

    void ShowCaption(char* Caption) {
        // Variables
            unsigned short lcdHeight;
            unsigned short lcdWidth;
        
        // Get the LCD Height and Width            
            BIOS_GetProp(LCD_PROP_HEIGHT, &lcdHeight);
            BIOS_GetProp(LCD_PROP_WIDTH,  &lcdWidth);
        
        // Write the Background for the caption
            LCD_SetColor(BLACK);
            LCD_Rect((lcdWidth - strlen(Caption) * 8) / 2, lcdHeight - 22, (lcdWidth + strlen(Caption) * 8) / 2, lcdHeight - 8);
            
        // Write the caption
            LCD_SetColor(WHITE);
            LCD_Printf((lcdWidth - strlen(Caption) * 8) / 2, lcdHeight - 20, "%s", Caption);
    }
    
    void ShowPicture(char* Filename) {
        // Variables
            COLOR        colorBuf[0x800];
            PICTURE_Info pictureInfo;
                        
        // Clear the Display and show the caption
            LCD_ClearDisplay(LCD_MakeColor(0xF0, 0xF0, 0xF0));
            
        // Get the Picture Info
            if (PICTURE_GetInfo(Filename, &pictureInfo) == E_OK) {
                // Draw the Picture
                    PICTURE_DrawEx(&pictureInfo, 0, 0, colorBuf, 0x800);
            }
            
        // Show the Caption
            ShowCaption(Filename);
    }

// --------------------------------------------------
//  Main                                              
// --------------------------------------------------
    void main() {
        // Variables
            char            buf[0x100];
            NCFS_FileHandle filehConfig;
            long            offset;
            
        // Init by making display landscape mode and clearing it with black color
            BIOS_SetPropVal(LCD_PROP_MODE, LCD_MODE_ROTATE_90_DEGREES);
            LCD_ClearDisplay(BLACK);
            
        // Main Loop
            while (1) {
                // Load config file
                    if (NCFS_GetFileHandle("NanoSlideShow.config", &filehConfig) != E_OK) {
                        // Error Message
                            LCD_Printf(10, 10, "Missing config file");
                            LCD_Printf(10, 20, "'NanoSlideShow.config'");
                            return;
                    }
                
                // Loop through the picture file names in the config file
                    offset = 0;
                    while (ReadNextLineFromFile(&filehConfig, &offset, buf) == E_OK) {
                        // Show the Picture
                            ShowPicture(buf);
                            
                        // Exit if keypad is pressed
                            if (KEYPAD_IsPressed(KEYPAD_VOL_DOWN) ||
                                KEYPAD_IsPressed(KEYPAD_VOL_UP) ||
                                KEYPAD_IsPressed(KEYPAD_MENU) ||
                                KEYPAD_IsPressed(KEYPAD_NEXT) ||
                                KEYPAD_IsPressed(KEYPAD_PREV) ||
                                KEYPAD_IsPressed(KEYPAD_PLAY)) {
                                    return;
                                }
                    }
            }
    }

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