PROCESSOR-SDK-AM68A: Request an example to use an AF feature

Hello,

As I know, TI H3A system supports an AF feature. But I couldn't find proper information to set the AF.
Would you provide an information to use AF feature?
Why I am asking, our system has a MFZ(Motorized Focus and Zoom) lens to support an auto focus function. And it should be worked in real time.

Belows are what I tried to set AF. But It seems that the ROI for AF was not set. Please check whether I tried to setup properly. 

What I tried : 

1. configured the ROI for AF/AEWB in "imx415_h3a_aewb_dcc.xml"

   <h3a_aewb_dcc type="iss_h3a_grid_size">
                {
                       1,     // enable:   u8
                       2,     // mode:     u8

                    920,     // v_start:  u16
                    1600,     // h_start:  u16

                      32,     // v_size:   u8
                      64,     // h_size:   u8

                      10,     // v_count:  u8
                      10,     // h_count:  u8

                       2,     // v_skip:   u8
                       2,     // h_skip:   u8

                    1000,     // saturation_limit: u16

                       2,     // blk_win_numlines: u16
                    2158,     // blk_row_vpos:     u16

                       2,     // Sum Shift:   u8

                       0,     // ALaw_En:     u8
                       0,     // MedFilt_En:  u8
                }

2. changed the "h3a_aewb_af_mode" to  "TIVX_VPAC_VISS_H3A_MODE_AF" in "/edgeai-tiovx-modules/src/tiovx_viss_module.c"

static vx_status tiovx_viss_module_configure_params(vx_context context, TIOVXVISSModuleObj *obj)
{                                                                                         
    vx_status status = VX_SUCCESS;                                                              
                                                                                        
    SensorObj *sensorObj = obj->sensorObj;                                            
                                                                                     
    obj->params.sensor_dcc_id       = sensorObj->sensorParams.dccId;  

..........................
                                                                       
    //obj->params.h3a_aewb_af_mode = TIVX_VPAC_VISS_H3A_MODE_AEWB;             
    obj->params.h3a_aewb_af_mode = TIVX_VPAC_VISS_H3A_MODE_AF;      
..........................

3. added print out to check the ROI in "/edgeai-gst-plugins/ext/tiovx/gsttiovxisp.c"

static gboolean                                                          
gst_tiovx_isp_postprocess (GstTIOVXMiso * miso)                          
{                                                                           
  GstTIOVXISP *self = NULL;                                                     
  GList *sink_pads_list = NULL;                                                 
  GList *l = NULL;                                                              
  gboolean ret = FALSE;                                                  
  struct v4l2_control control;                                        
  gchar *video_dev = NULL;                                                  
  vx_map_id h3a_buf_map_id;                                                  
  vx_map_id aewb_buf_map_id;                      
  gint i = 0;      

..........................  
  ti_2a_wrapper_ret = TI_2A_wrapper_process (&sink_pad->ti_2a_wrapper, &sink_pad->aewb_config, h3a_data, &sink_pad->sensor_in_data, ae_awb_result, &sink_pad->sensor_out_data);
  if (ti_2a_wrapper_ret) {
    GST_ERROR_OBJECT (self, "Unable to process TI 2A wrapper: %d",
    ti_2a_wrapper_ret);
    goto out;
  }
  GST_LOG_OBJECT (sink_pad, "Exposure time output from TI 2A library: %d",
    sink_pad->sensor_out_data.aePrms.exposureTime[0]);
  GST_LOG_OBJECT (sink_pad, "Analog gain output from TI 2A library: %d",
    sink_pad->sensor_out_data.aePrms.analogGain[0]);


  printf("H3A aewwin1_WINH:%d aewwin1_WINW:%d aewwin1_WINVC:%d, aewwin1_WINHC:%d\n", h3a_data->aew_config.aewwin1_WINH , h3a_data->aew_config.aewwin1_WINW , h3a_data->aew_config.aewwin1_WINVC , h3a_d
  printf("H3A aew_af_mode:%d channel_id:%d cpu_id:%d, size:%d\n", h3a_data->aew_af_mode, h3a_data->channel_id, h3a_data->cpu_id, h3a_data->size);
    
..........................  

Print Out :

H3A aewwin1_WINH:0 aewwin1_WINW:0 aewwin1_WINVC:0, aewwin1_WINHC:0      => ROI was not set
H3A aew_af_mode:1 channel_id:0 cpu_id:3, size:2112

Thanks, 

Jang.