Start with C
================
    There are several steps to get camera data: 
        1. create a camera instance.
        2. start the camera.
        3. request a frame.
        4. get frame data
        5. release frame space
        6. stop the camera

----------        
example
----------
    ::

        #include "ArducamDepthCamera.h"
        #include <stdlib.h>
        #include <stdio.h>

        void getPreview(uint8_t *preview_ptr, float *phase_image_ptr, float *amplitude_image_ptr)
        {
            unsigned long int len = 240 * 180;
            for (unsigned long int i = 0; i < len; i++)
            {
                uint8_t amplitude = *(amplitude_image_ptr + i) > 30 ? 254 : 0;
                float phase = ((1 - (*(phase_image_ptr + i) / 2)) * 255);
                uint8_t depth = phase > 255 ? 255 : phase;
                *(preview_ptr + i) = depth & amplitude;
            }
        }

        int main()
        {   
            ArducamDepthCamera tof = createArducamDepthCamera();
            ArducamFrameBuffer frame;
            if (init(tof,CSI,0))
                exit(-1);
            if (start(tof,DEPTH_FRAME))
                exit(-1);

            FrameFormat format;
            if ((frame = requestFrame(tof,200)) != 0x00){
                getFormat(frame,DEPTH_FRAME,format);
            }
            releaseFrame(tof,frame);  
            uint8_t *preview_ptr = malloc(format.width*format.height*sizeof(uint8_t)) ;
            float* depth_ptr = 0;
            int16_t *raw_ptr = 0;
            float *amplitude_ptr = 0;
            while (1)
            {
                if ((frame = requestFrame(tof,200)) != 0x00)
                {
                    depth_ptr = (float*)getDepthData(frame);
                    printf("Center distance:%.2f.\n",depth_ptr[21600]);
                    amplitude_ptr = (float*)getAmplitudeData(frame);
                    getPreview(preview_ptr,depth_ptr,amplitude_ptr);
                    releaseFrame(tof,frame);  
                }
            }
            free(preview_ptr);
            if (stop(tof))
                exit(-1);
            return 0;
        }

.. note:: For specific function usage details, please refer to the API

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Test Results
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.. image:: ../_static/images/c_test.png
   :alt: c_test
   :align: center