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Create KL720 Single Model Example

1. Download Source Code

  1. Download the latest kneron_plus_vXXX.zip into Windows from https://www.kneron.com/tw/support/developers/. It is located at Kneron PLUS section.

  2. Unzip kneron_plus_vXXX.zip

Note: {PLUS_FOLDER_PATH} will be used below for representing the unzipped folder path of PLUS.

2. PLUS (Software) Development

  1. Create my_kl720_sin_example folder

    $ cd {PLUS_FOLDER_PATH}/examples/
$ mkdir my_kl720_sin_example

  2. Add CMakelists.txt

    # build with current *.c/*.cpp plus common source files in parent folder
# executable name is current folder name.

get_filename_component(app_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
string(REPLACE " " "_" app_name ${app_name})

file(GLOB local_src
    "*.c"
    "*.cpp"
    )

set(common_src
    ../../ex_common/helper_functions.c
    )

add_executable(${app_name}
    ${local_src}
    ${common_src})

target_link_libraries(${app_name} ${KPLUS_LIB_NAME} ${USB_LIB} ${MATH_LIB} pthread)

  3. Add my_kl720_sin_example.h

    • Please define the customized header structure and customized result structure in this file.

    • Header (my_kl720_sin_example_header_t) is used for sending data to SCPU firmware. What kind of data should be contained can be customized based on the your requirement.

    • Result (my_kl720_sin_example_result_t) is used for receiving data from SCPU firmware. What kind of data should be contained can be customized based on the output of model inference.

    • kp_inference_header_stamp_t must be contained in both header and result structures.

    • The JOB_ID describes the unique id of the task you want to execute in firmware, and it must be unique and above 1000.

    • This file should be synchronized with the .h file in SCPU firmware.

    #pragma once

#define MY_KL720_SIN_EXAMPLE_JOB_ID     2002
#define YOLO_BOX_MAX                    100

typedef struct {
    uint32_t class_count;
    uint32_t box_count;
    kp_bounding_box_t boxes[YOLO_BOX_MAX];
} __attribute__((aligned(4))) my_kl720_sin_example_yolo_result_t;

typedef struct {
    /* header stamp is necessary */
    kp_inference_header_stamp_t header_stamp;

    uint32_t img_width;
    uint32_t img_height;
} __attribute__((aligned(4))) my_kl720_sin_example_header_t;

typedef struct {
    /* header stamp is necessary */
    kp_inference_header_stamp_t header_stamp;

    my_kl720_sin_example_yolo_result_t yolo_result;
} __attribute__((aligned(4))) my_kl720_sin_example_result_t;

  4. Add my_kl720_sin_example.c

    • There are 5 steps for inferencing in Kneron AI device:

      1. Connect Kneron AI device.

      2. Upload the model to AI device.

      3. Prepare data for the header.

      4. Send the header and image buffer to SCPU firmware via kp_customized_inference_send().

      5. Receive the result from SCPU firmware via kp_customized_inference_receive().

    • In this example, the image is transcoded into RGB565, and the width and height of the image is carried by the header.

    • Sending header and receiving result can be executed sequentially or on two different threads.

    #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "kp_core.h"
#include "kp_inference.h"
#include "helper_functions.h"

#include "my_kl720_sin_example.h"

static char _model_file_path[128] = "../../res/models/KL720/YoloV5s_640_640_3/models_720.nef";
static char _image_file_path[128] = "../../res/images/one_bike_many_cars_608x608.bmp";
static int _loop = 10;

int main(int argc, char *argv[])
{
    kp_devices_list_t *device_list;
    kp_device_group_t device;
    kp_model_nef_descriptor_t model_desc;
    int ret;

    // each device has a unique port ID, 0 for auto-search
    int port_id = (argc > 1) ? atoi(argv[1]) : 0;
    int error_code;

    /******* check the device USB speed *******/
    {
        int link_speed;
        device_list = kp_scan_devices();

        helper_get_device_usb_speed_by_port_id(device_list, port_id, &link_speed);
        if (KP_USB_SPEED_SUPER != link_speed)
            printf("[warning] device is not run at super speed.\n");
    }

    /******* connect the device *******/
    {
        // connect device
        device = kp_connect_devices(1, &port_id, &error_code);
        if (!device) {
            printf("connect device failed, port ID = '%d', error = '%d'\n", port_id, error_code);
            exit(0);
        }

        kp_set_timeout(device, 5000);
        printf("connect device ... OK\n");
    }

    /******* upload model to device *******/
    {
        ret = kp_load_model_from_file(device, _model_file_path, &model_desc);
        if (ret != KP_SUCCESS) {
            printf("upload model failed, error = %d\n", ret);
            exit(0);
        }

        printf("upload model ... OK\n");
    }

    /******* prepare the image buffer read from file *******/
    // here convert a bmp file to RGB565 format buffer

    int img_width, img_height;
    char *img_buf = helper_bmp_file_to_raw_buffer(_image_file_path, &img_width, &img_height, KP_IMAGE_FORMAT_RGB565);

    if (!img_buf) {
        printf("read image file failed\n");
        exit(0);
    }

    printf("read image ... OK\n");
    printf("\nstarting inference loop %d times:\n", _loop);

    /******* prepare input and output header/buffers *******/
    my_kl720_sin_example_header_t input_header;
    my_kl720_sin_example_result_t output_result;

    input_header.header_stamp.job_id = MY_KL720_SIN_EXAMPLE_JOB_ID;
    input_header.header_stamp.total_image = 1;
    input_header.header_stamp.image_index = 0;
    input_header.img_width = img_width;
    input_header.img_height = img_height;

    int header_size = sizeof(my_kl720_sin_example_header_t);
    int image_size = img_width * img_height * 2; // RGB565
    int result_size = sizeof(my_kl720_sin_example_result_t);
    int recv_size = 0;

    /******* starting inference work *******/

    for (int i = 0; i < _loop; i++)
    {
        ret = kp_customized_inference_send(device, (void *)&input_header, header_size, (uint8_t *)img_buf, image_size);

        if (ret != KP_SUCCESS) {
            break;
        }

        ret = kp_customized_inference_receive(device, (void *)&output_result, result_size, &recv_size);

        if (ret != KP_SUCCESS) {
            break;
        }

        printf("\n[loop %d]\n", i + 1);
        helper_print_yolo_box_on_bmp((kp_yolo_result_t *)&output_result.yolo_result, _image_file_path);
    }

    printf("\n");

    if (ret != KP_SUCCESS) {
        printf("\ninference failed, error = %d\n", ret);
        return -1;
    }

    free(img_buf);
    kp_release_model_nef_descriptor(&model_desc);
    kp_disconnect_devices(device);

    return 0;
}

3. SCPU Firmware Development

  1. Go to SCPU App Folder {PLUS_FOLDER_PATH}/firmware_development/KL720/firmware/app

  2. Add my_kl720_sin_example_inf.h into include folder

    • The content of this file should be synchronized with my_kl720_sin_example.h in PLUS.
    #pragma once

#define MY_KL720_SIN_EXAMPLE_JOB_ID     2002
#define YOLO_BOX_MAX                    100

typedef struct {
    uint32_t class_count;
    uint32_t box_count;
    kp_bounding_box_t boxes[YOLO_BOX_MAX];
} __attribute__((aligned(4))) my_kl720_sin_example_yolo_result_t;

typedef struct {
    /* header stamp is necessary */
    kp_inference_header_stamp_t header_stamp;

    uint32_t img_width;
    uint32_t img_height;
} __attribute__((aligned(4))) my_kl720_sin_example_header_t;

typedef struct {
    /* header stamp is necessary */
    kp_inference_header_stamp_t header_stamp;

    my_kl720_sin_example_yolo_result_t yolo_result;
} __attribute__((aligned(4))) my_kl720_sin_example_result_t;

void my_kl720_sin_example_inf(int job_id, int num_input_buf, void **inf_input_buf_list);

  3. Add my_kl720_sin_example_inf.c

    • There are four steps for inferencing in one model:

      1. Prepare the memory space for the result.

      2. Prepare kmdw_inference_app_config_t, which is used for configure the inference in NCPU firmware.

      3. Activate NCPU firmware via kmdw_inference_app_execute().

      4. Send the result to PLUS via kmdw_fifoq_manager_result_enqueue().

    • For the customized model, model_id of kmdw_inference_app_config_t should be set to the id of the customized model.

    • The inference result of NCPU will be written to ncpu_result_buf of kmdw_inference_app_config_t. Therefore, you must provide a memory space for it (In this example, ncpu_result_buf is pointed to yolo_result in output_result.)

    #include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "model_type.h"
#include "kmdw_console.h"

#include "kmdw_inference_app.h"
#include "kmdw_fifoq_manager.h"
#include "my_kl720_sin_example_inf.h"

/**
 * @brief describe a yolo post-process configurations for yolo v5 series
*/
typedef struct
{
    float prob_thresh;
    float nms_thresh;
    uint32_t max_detection_per_class;
    uint16_t anchor_row;
    uint16_t anchor_col;
    uint16_t stride_size;
    uint16_t reserved_size;
    uint32_t data[40];
} __attribute__((aligned(4))) kp_app_yolo_post_proc_config_t;

static kp_app_yolo_post_proc_config_t post_proc_params_v5s = {
    .prob_thresh = 0.15,
    .nms_thresh = 0.5,
    .max_detection_per_class = 20,
    .anchor_row = 3,
    .anchor_col = 6,
    .stride_size = 3,
    .reserved_size = 0,
    .data = {
        // anchors[3][6]
        10, 13, 16, 30, 33, 23,
        30, 61, 62, 45, 59, 119,
        116, 90, 156, 198, 373, 326,
        // strides[3]
        8, 16, 32,
    },
};

void my_kl720_sin_example_inf(int job_id, int num_input_buf, void **inf_input_buf_list)
{
    if (1 != num_input_buf) {
        kmdw_inference_app_send_status_code(job_id, KP_FW_WRONG_INPUT_BUFFER_COUNT_110);
        return;
    }

    int output_result_buf_size;
    void *inf_result_buf = kmdw_fifoq_manager_result_get_free_buffer(&output_result_buf_size);

    my_kl720_sin_example_header_t *input_header = (my_kl720_sin_example_header_t *)inf_input_buf_list[0];
    my_kl720_sin_example_result_t *output_result = (my_kl720_sin_example_result_t *)inf_result_buf;

    // config image preprocessing and model settings
    kmdw_inference_app_config_t inf_config;
    memset(&inf_config, 0, sizeof(kmdw_inference_app_config_t)); // for safety let default 'bool' to 'false'

    // image buffer address should be just after the header
    inf_config.num_image = 1;

    inf_config.image_list[0].image_buf = (void *)((uint32_t)input_header + sizeof(my_kl720_sin_example_header_t));
    inf_config.image_list[0].image_width = input_header->width;
    inf_config.image_list[0].image_height = input_header->height;
    inf_config.image_list[0].image_channel = 3;                                     // assume RGB565
    inf_config.image_list[0].image_format = KP_IMAGE_FORMAT_RGB565;                 // assume RGB565
    inf_config.image_list[0].image_norm = KP_NORMALIZE_KNERON;                      // this depends on model
    inf_config.image_list[0].image_resize = KP_RESIZE_ENABLE;                       // enable resize
    inf_config.image_list[0].image_padding = KP_PADDING_CORNER;                     // enable padding on corner
    inf_config.model_id = KNERON_YOLOV5S_COCO80_640_640_3;                          // this depends on model
    inf_config.ncpu_result_buf = (void *)&(output_result->yolo_result);             // give result buffer for ncpu/npu, callback will carry it
    inf_config.user_define_data = (void *)&post_proc_params_v5s;                    // yolo post-process configurations for yolo v5 series

    // run preprocessing and inference, trigger ncpu/npu to do the work
    // if enable_parallel=true (works only for single model), result callback is needed
    // however if inference error then no callback will be invoked
    int inf_status = kmdw_inference_app_execute(&inf_config);

    // header_stamp is a must to correctly transfer result data back to host SW
    output_result->header_stamp.magic_type = KDP2_MAGIC_TYPE_INFERENCE;
    output_result->header_stamp.total_size = sizeof(my_kl720_sin_example_result_t);
    output_result->header_stamp.job_id = job_id;
    output_result->header_stamp.status_code = inf_status;

    // send output result buffer back to host SW
    kmdw_fifoq_manager_result_enqueue((void *)output_result, output_result_buf_size, false);
}

  4. Go to SCPU Project Main Folder {PLUS_FOLDER_PATH}/firmware_development/KL720/firmware/build/solution_kdp2_user_ex/main_scpu

  5. Edit application_init.c

    • _app_func is the entry interface for all inference request.

    • Inference jobs will be dispatched to the coresponding function based on the job_id in kp_inference_header_stamp_t in the header.

    • You need to establish a switch case for MY_KL720_SIN_EXAMPLE_JOB_ID and corespond the switch case to my_kl720_sin_example_inf().

    #include <stdio.h>
#include "cmsis_os2.h"

// inference core
#include "kp_struct.h"
#include "kmdw_console.h"
#include "kmdw_inference_app.h"

// inference app
#include "kdp2_inf_app_yolo.h"
#include "demo_customize_inf_single_model.h"
#include "demo_customize_inf_multiple_models.h"
/* ======================================== */
/*              Add Line Begin              */
/* ======================================== */
#include "my_kl720_sin_example_inf.h"
/* ======================================== */
/*               Add Line End               */
/* ======================================== */
// inference client
#include "kdp2_usb_companion.h"

#define MAX_IMAGE_COUNT   10          /**< MAX inference input  queue slot count */
#define MAX_RESULT_COUNT  10          /**< MAX inference output queue slot count */

/**
 * @brief To register AI applications
* @param[in] num_input_buf number of data inputs in list
* @param[in] inf_input_buf_list list of data input for inference task
* @return N/A
* @note Add a switch case item for a new inf_app application
*/
static void _app_func(int num_input_buf, void **inf_input_buf_list);

static void _app_func(int num_input_buf, void **inf_input_buf_list)
{
    // check header stamp
    if (0 >= num_input_buf) {
        kmdw_printf("No input buffer for app function\n");
        return;
    }

    void *first_inf_input_buf = inf_input_buf_list[0];
    kp_inference_header_stamp_t *header_stamp = (kp_inference_header_stamp_t *)first_inf_input_buf;
    uint32_t job_id = header_stamp->job_id;

    switch (job_id) {
    case KDP2_INF_ID_APP_YOLO:
        kdp2_app_yolo_inference(job_id, num_input_buf, inf_input_buf_list);
        break;
    case KDP2_JOB_ID_APP_YOLO_CONFIG_POST_PROC:
        kdp2_app_yolo_config_post_process_parameters(job_id, num_input_buf, inf_input_buf_list);
        break;
    case DEMO_KL720_CUSTOMIZE_INF_SINGLE_MODEL_JOB_ID: // a demo code implementation in SCPU for user-defined/customized inference from one model
        demo_customize_inf_single_model(job_id, num_input_buf, inf_input_buf_list);
        break;
    case DEMO_KL720_CUSTOMIZE_INF_MULTIPLE_MODEL_JOB_ID: // a demo code implementation in SCPU for user-defined/customized inference from multiple model
    demo_customize_inf_multiple_model(job_id, num_input_buf, inf_input_buf_list);
    break;
    /* ======================================== */
    /*              Add Line Begin              */
    /* ======================================== */
    case MY_KL720_SIN_EXAMPLE_JOB_ID:
        my_kl720_sin_example_inf(job_id, num_input_buf, inf_input_buf_list);
        break;
    /* ======================================== */
    /*               Add Line End               */
    /* ======================================== */
    default:
        kmdw_inference_app_send_status_code(job_id, KP_FW_ERROR_UNKNOWN_APP);
        break;
    }
}

void app_initialize(void)
{
    info_msg(">> Start running KL720 KDP2 companion mode ...\n");

    /* initialize inference app */
    /* register APP functions */
    /* specify depth of inference queues */
    kmdw_inference_app_init(_app_func, MAX_IMAGE_COUNT, MAX_RESULT_COUNT);

    /* companion mode init */
    kdp2_usb_companion_init();

    return;
}

4. NCPU Firmware Development for The Pre-process and Post-process

If the customized model need a customized pre-process or post-process, you can add the pre-process and post-process in the following files.

  1. Go to NCPU Project Main Folder {PLUS_FOLDER_PATH}/firmware_development/KL720/firmware/platform/kl720/ncpu/ncpu_main/src

  2. Add your customized pre-process function into user_pre_process.c

  3. Add your customized post-process function into user_post_process.c

  4. You may reference the pre_post_proc_template.c for guidance of how to access from input/output node of the model

  5. Edit model_ftr_table.c

    • Add your customized pre-process into model_pre_proc_fns table with the ID of your model.

    • Add your customized post-process into model_post_proc_fns talbe with the ID of your model.

    • Once pre-process and post-process are registered, they will automatically execute before and after the inference of model.

    • The pre-process and post-process for certain model are specified by the model Id.

Note: During developing the post-processing, you must be aware of what pre-process has done, including image resize, image padding, and image cropping.

Note: In post-processing, the memory layout of data in raw_cnn_res_t for KL520 and KL720 are different. Please reference Kneron NPU Raw Output Channel Order.