Diff: JPEGCamera.cpp

Revision:

0:f728b8e6bdf2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JPEGCamera.cpp	Fri Nov 15 14:02:01 2019 +0000
@@ -0,0 +1,144 @@
+/* Arduino JPEGCamera Library
+ * Copyright 2010 SparkFun Electronic
+ * Written by Ryan Owens
+ * Modified by arms22
+ * Ported to mbed by yamaguch
+ */
+
+#include "JPEGCamera.h"
+
+#define min(x, y) ((x) < (y)) ? (x) : (y)
+
+const int RESPONSE_TIMEOUT = 500;
+const int DATA_TIMEOUT = 1000;
+
+JPEGCamera::JPEGCamera(PinName tx, PinName rx) : Serial(tx, rx) {
+    printf("AA\r\n");
+    baud(38400);
+    state = READY;
+}
+
+bool JPEGCamera::setPictureSize(JPEGCamera::PictureSize size, bool doReset) {
+    char buf[9] = {0x56, 0x00, 0x31, 0x05, 0x04, 0x01, 0x00, 0x19, (char) size};
+    int ret = sendReceive(buf, sizeof buf, 5);
+
+    if (ret == 5 && buf[0] == 0x76) {
+        if (doReset)
+            reset();
+        return true;
+    } else
+        return false;
+}
+
+bool JPEGCamera::isReady() {
+    return state == READY;
+}
+
+bool JPEGCamera::isProcessing() {
+    return state == PROCESSING;
+}
+
+bool JPEGCamera::takePicture(char *filename) {
+    if (state == READY) {
+        fp = fopen(filename, "wb");
+        if (fp != 0) {
+            if (takePicture()) {
+                imageSize = getImageSize();
+                address = 0;
+                state = PROCESSING;
+            } else {
+                fclose(fp);
+                printf("takePicture(%s) failed", filename);
+                state = ERROR;
+            }
+        } else {
+            printf("fopen() failed");
+            state = ERROR;
+        }
+    }
+    return state != ERROR;
+}
+
+bool JPEGCamera::processPicture() {
+    if (state == PROCESSING) {
+        if (address < imageSize) {
+            char data[1024];
+            int size = readData(data, min(sizeof(data), imageSize - address), address);
+            int ret = fwrite(data, size, 1, fp);
+            if (ret > 0)
+                address += size;
+            if (ret == 0 || address >= imageSize) {
+                stopPictures();
+                fclose(fp);
+                wait(0.1); // ????
+                state = ret > 0 ? READY : ERROR;
+            }
+        }
+    }
+
+    return state == PROCESSING || state == READY;
+}
+
+bool JPEGCamera::reset() {
+    char buf[4] = {0x56, 0x00, 0x26, 0x00};
+    int ret = sendReceive(buf, sizeof buf, 4);
+    if (ret == 4 && buf[0] == 0x76) {
+        wait(4.0);
+        state = READY;
+    } else {
+        state = ERROR;
+    }
+    return state == READY;
+}
+
+bool JPEGCamera::takePicture() {
+    char buf[5] = {0x56, 0x00, 0x36, 0x01, 0x00};
+    int ret = sendReceive(buf, sizeof buf, 5);
+
+    return ret == 5 && buf[0] == 0x76;
+}
+
+bool JPEGCamera::stopPictures() {
+    char buf[5] = {0x56, 0x00, 0x36, 0x01, 0x03};
+    int ret = sendReceive(buf, sizeof buf, 5);
+
+    return ret == 4 && buf[0] == 0x76;
+}
+
+int JPEGCamera::getImageSize() {
+    char buf[9] = {0x56, 0x00, 0x34, 0x01, 0x00};
+    int ret = sendReceive(buf, sizeof buf, 9);
+
+    //The size is in the last 2 characters of the response.
+    return (ret == 9 && buf[0] == 0x76) ? (buf[7] << 8 | buf[8]) : 0;
+}
+
+int JPEGCamera::readData(char *dataBuf, int size, int address) {
+    char buf[16] = {0x56, 0x00, 0x32, 0x0C, 0x00, 0x0A, 0x00, 0x00,
+                    address >> 8, address & 255, 0x00, 0x00, size >> 8, size & 255, 0x00, 0x0A
+                   };
+    int ret = sendReceive(buf, sizeof buf, 5);
+
+    return (ret == 5 && buf[0] == 0x76) ? receive(dataBuf, size, DATA_TIMEOUT) : 0;
+}
+
+int JPEGCamera::sendReceive(char *buf, int sendSize, int receiveSize) {
+    while (readable()) getc();
+
+    for (int i = 0; i < sendSize; i++) putc(buf[i]);
+
+    return receive(buf, receiveSize, RESPONSE_TIMEOUT);
+}
+
+int JPEGCamera::receive(char *buf, int size, int timeout) {
+    timer.start();
+    timer.reset();
+
+    int i = 0;
+    while (i < size && timer.read_ms() < timeout) {
+        if (readable())
+            buf[i++] = getc();
+    }
+
+    return i;
+}
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