Merge pull request #27 from arduino-libraries/marqdevx/vision-shield/…

…bitmap-SD

Add Vision Shield bitmap to SD sketch

.github/workflows/compile-examples.yml

@@ -45,6 +45,7 @@ jobs:
               - examples/Portenta H7 as a USB Host/LEDKeyboardController
               - examples/Portenta H7 as a WiFi Access Point/SimpleWebServer
               - examples/Setting Up Portenta H7 For Arduino/Blink
+              - examples/Vision Shield to SD Card bmp/visionShieldBitmap
 
           - fqbn: arduino:mbed_portenta:envie_m4
             sketch-paths: |

examples/Vision Shield to SD Card bmp/visionShieldBitmap/visionShieldBitmap.ino

@@ -0,0 +1,126 @@
+#include "SDMMCBlockDevice.h" // Multi Media Card APIs
+#include "FATFileSystem.h"    // Mbed API for portable  and embedded systems
+SDMMCBlockDevice blockDevice;
+mbed::FATFileSystem fileSystem("fs");
+
+#include "camera.h" // Arduino Mbed Core Camera APIs
+#include "himax.h"  // Exclusive Camera library for the Portenta Vision Shield
+HM01B0 himax;
+Camera cam(himax);
+
+FrameBuffer fb; // Buffer to save the capture
+
+// Settings for our setup
+#define RES_H (unsigned int)240
+#define RES_W (unsigned int)320
+#define IMAGE_MODE CAMERA_GRAYSCALE
+#define IMAGE_BPP (unsigned int)8
+// Headers info
+#define HEADER_FILE_HEADER (unsigned int)14
+#define HEADER_DIB_SIZE (unsigned int)40
+#define HEADER_FULL_SIZE (HEADER_FILE_HEADER + HEADER_DIB_SIZE)
+#define PALETTE_SIZE (2 ^ IMAGE_BPP) * 4 // 4 bytes per color
+
+void setup()
+{
+    Serial.begin(115200);
+    while (!Serial)
+        ;
+
+    // Mount SD Card
+    mountSD();
+
+    // Init the cam QVGA, 30FPS, Grayscale
+    if (!cam.begin(CAMERA_R320x240, IMAGE_MODE, 30))
+    {
+        Serial.println("Unable to find the camera");
+    }
+
+    // Save the headers and the image data into the .bmp file
+    parseData();
+}
+
+void loop()
+{
+    while (1)
+        ;
+}
+
+// Mount File system block
+void mountSD()
+{
+    Serial.println("Mounting SD Card...");
+
+    int error = fileSystem.mount(&blockDevice);
+    if (error)
+    {
+        Serial.println("No SD Card found");
+        while (1)
+            ;
+    }
+}
+
+void parseData()
+{
+    unsigned char *imgData = NULL;
+    int fileSize = HEADER_FILE_HEADER + RES_W * RES_H;
+
+    FILE *file = fopen("/fs/image.bmp", "w+");
+
+    // Get a Frame
+    if (cam.grabFrame(fb, 3000) == 0)
+    {
+        // Save the raw image data (8bpp grayscale)
+        imgData = fb.getBuffer();
+    }
+    else
+    {
+        Serial.println("could not grab the frame");
+        while (1)
+            ;
+    }
+    // Bitmap structure (Head + DIB Head + ColorMap + binary image)
+    unsigned char bitmapFileHeader[HEADER_FILE_HEADER];
+    unsigned char bitmapDIBHeader[HEADER_DIB_SIZE];
+    unsigned char colorMap[PALETTE_SIZE]; // Needed for <=8bpp grayscale bitmaps
+
+    // Set the file headers to 0
+    memset(bitmapFileHeader, (unsigned char)(0), HEADER_FILE_HEADER);
+    memset(bitmapDIBHeader, (unsigned char)(0), HEADER_DIB_SIZE);
+    memset(colorMap, (unsigned char)(0), PALETTE_SIZE);
+
+    // Write the headers info
+    // File header
+    bitmapFileHeader[0] = 'B';
+    bitmapFileHeader[1] = 'M';
+    bitmapFileHeader[2] = (unsigned char)(fileSize);
+    bitmapFileHeader[3] = (unsigned char)(fileSize >> 8);
+    bitmapFileHeader[4] = (unsigned char)(fileSize >> 16);
+    bitmapFileHeader[5] = (unsigned char)(fileSize >> 24);
+    bitmapFileHeader[10] = (unsigned char)HEADER_FULL_SIZE + PALETTE_SIZE;
+
+    // Info header
+    bitmapDIBHeader[0] = (unsigned char)(HEADER_DIB_SIZE);
+    bitmapDIBHeader[4] = (unsigned char)(RES_W);
+    bitmapDIBHeader[5] = (unsigned char)(RES_W >> 8);
+    bitmapDIBHeader[8] = (unsigned char)(RES_H);
+    bitmapDIBHeader[8] = (unsigned char)(RES_H >> 8);
+    bitmapDIBHeader[14] = (unsigned char)(IMAGE_BPP);
+
+    // Color palette for grayscale Bitmaps (8bpp)
+    for (int i = 0; i < (2 ^ IMAGE_BPP); i++)
+    {
+        colorMap[i * 4] = i;
+        colorMap[i * 4 + 1] = i;
+        colorMap[i * 4 + 2] = i;
+    }
+
+    // Write theh bitmap file
+    fwrite(bitmapFileHeader, 1, HEADER_FILE_HEADER, file);
+    fwrite(bitmapDIBHeader, 1, HEADER_DIB_SIZE, file);
+    fwrite(colorMap, 1, PALETTE_SIZE, file); // Color map
+    fwrite(imgData, 1, RES_H * RES_W, file);
+
+    // Close the stream (bitmap file)
+    fclose(file);
+}