2025b_fasttrack_source/Core/Src/ImC/ai.cc

/*
 * main_functions.cc
 *
 *  Created on: Feb 27, 2022
 *      Author: pgj
 */


#include "ImC/ai.h"
#include "tensorflow/lite/micro/all_ops_resolver.h"
#include "tensorflow/lite/micro/examples/hello_world/constants.h"
#include "tensorflow/lite/micro/examples/hello_world/output_handler.h"
#include "tensorflow/lite/micro/micro_error_reporter.h"
#include "tensorflow/lite/micro/micro_interpreter.h"
#include "tensorflow/lite/micro/recording_micro_interpreter.h"
#include "tensorflow/lite/micro/system_setup.h"
#include "tensorflow/lite/schema/schema_generated.h"
#include "stm32l496xx.h"
#include "ImC/new_model.h"






namespace {
tflite::ErrorReporter* error_reporter = nullptr;
const tflite::Model* model = nullptr;
tflite::MicroInterpreter* interpreter = nullptr;
TfLiteTensor* input = nullptr;
TfLiteTensor* output_tensor = nullptr;

}

uint8_t* setup(uint8_t* tensor_arena, int kTensorArenaSize, float *scale, int32_t* zero_point) {


  tflite::InitializeTarget();
  model = tflite::GetModel(resnet_quant_tflite);

  static tflite::MicroErrorReporter micro_error_reporter;
  error_reporter = &micro_error_reporter;

  static tflite::AllOpsResolver resolver;
  static tflite::MicroInterpreter static_interpreter( model, resolver, tensor_arena, kTensorArenaSize, error_reporter);
  interpreter = &static_interpreter;

  TfLiteStatus allocate_status = interpreter->AllocateTensors();
  if (allocate_status != kTfLiteOk) {
      TF_LITE_REPORT_ERROR(error_reporter, "AllocateTensors() failed");
      return NULL;
  }


  input  = interpreter->input(0);
  output_tensor = interpreter->output(0);

  *scale =  interpreter->input(0)->params.scale;
  *zero_point = interpreter->input(0)->params.zero_point;

  return input->data.uint8;
}

extern uint8_t* dst_image[120][160][3];

/*void preprocess_input(){
	printf("[AI ] input size: %d bytes \r\n", input->bytes);

	uint32_t index = 0;
	float temp = 0.0;

	for(uint32_t i = 0; i < 120; ++i){
	  for(uint32_t j = 0; j < 160; ++j){
		  for(uint32_t k = 0; k < 3; k++){
			  temp = (dst_image[i][j][k] / 255.0)  / interpreter->input(0)->params.scale + interpreter->input(0)->params.zero_point;
			  input->data.int8[index++] = (int8_t) ( temp);
		  }
	  }

	}

}
*/

void print_output(){
	uint32_t max_index = 0;
	float max_value = output_tensor->data.f[0];
	// output_tensor->bytes << int  ,  bytes/4 << float
	// printf("Output size is %d\r\n", output_tensor->bytes);

	for(uint32_t i = 0; i < (uint32_t)(output_tensor->bytes/4.0); ++i){
		if(output_tensor->data.f[i] > max_value){
		  max_value = output_tensor->data.f[i];
		  max_index = i;
		}
		// printf("[AI ] class %d: %f\r\n", (uint8_t)i, output_tensor->data.f[i]);
	}
	if(max_index >= 10 || max_index < 0){
	max_index = -1;
	}

	switch (max_index) {
	case 1:
		printf("[AI ] OK Person, %f\r\n",  output_tensor->data.f[1]);
		break;
	default:
		printf("[AI ] OK NOT person, %f\r\n",  output_tensor->data.f[1]);
		break;
	}
}


int perform_inference() {
  TfLiteStatus invoke_status = interpreter->Invoke();
  if (invoke_status != kTfLiteOk) {
    TF_LITE_REPORT_ERROR(error_reporter, "[AI ] FAILED invoke\n");
    return -1;
  }

  return 0;
}