Beginner
10 min

Achieve limitless control with AS5013 and ATmega32

Tiny but mighty!

Joystick Click with EasyAVR v7

Published Nov 01, 2023

Click board™

Joystick Click

Dev. board

EasyAVR v7

Compiler

NECTO Studio

MCU

ATmega32

Control devices or systems by moving a knob in different directions

A

A

Hardware Overview

How does it work?

Joystick Click is based on the AS5013 and N50P105, a miniature magnetic joystick module, and a complete hall sensor IC from ams AG. The N50P105 represents a smart navigation key concept based on contactless magnetic movement detection. That's precisely why this Click board™ is characterized by high reliability due to magnetic contact-less sensing. On the other hand, the two-dimensional linear encoder AS5013, mounted into the joystick, directly provides the X and Y coordinate through an I2C interface, thus forming a high-quality joystick. The AS5013 includes five integrated Hall sensing elements for detecting up to

±2mm lateral displacement, high-resolution ADC, XY coordinate, and motion detection engine combined with a smart power management controller. The X and Y positions coordinate, and magnetic field information for each Hall sensor element is transmitted over a 2-wire I2C compliant interface to the host MCU with a maximum clock frequency of 3.4MHz. Also, the AS5013 allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labeled I2C ADD. Also, an additional feature of this board represents an integrated mechanical push button built into the N50P105 joystick providing a "Select"

function that can be digitally tracked via the CS pin on the mikroBUS™ socket marked as TST. Alongside its interrupt feature routed to the INT pin of the mikroBUS™ socket, the AS5013 also provides an active-low Reset function routed to the RST pin on the mikroBUS™ socket. This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Joystick Click hardware overview image

Features overview

Development board

EasyAVR v7 is the seventh generation of AVR development boards specially designed for the needs of rapid development of embedded applications. It supports a wide range of 16-bit AVR microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyAVR v7 allows you to connect accessory boards, sensors, and custom electronics more

efficiently than ever. Each part of the EasyAVR v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use a wide range of external power sources, including an external 12V power supply, 7-12V AC or 9-15V DC via DC connector/screw terminals, and a power source via the USB Type-B (USB-B)

connector. Communication options such as USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets which cover a wide range of 16-bit AVR MCUs. EasyAVR v7 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

EasyAVR v7 horizontal image

Microcontroller Overview

MCU Card / MCU

default

Architecture

AVR

MCU Memory (KB)

32

Silicon Vendor

Microchip

Pin count

40

RAM (Bytes)

2048

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Reset
PA6
RST
Pushbutton Detection
PA5
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Interrupt
PD2
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PC0
SCL
I2C Data
PC1
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

Joystick Click Schematic schematic

Step by step

Project assembly

EasyAVR v7 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyAVR v7 as your development board.

EasyAVR v7 front image hardware assembly
GNSS2 Click front image hardware assembly
MCU DIP 40 hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
EasyAVR v7 Access DIP MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
EasyPIC PRO v7a Display Selection Necto Step hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.

2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.

3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.

Software Support

Library Description

This library contains API for Joystick Click driver.

Key functions:

  • joystick_get_position - Get joystick position function

  • joystick_press_button - Get state of Joystick button function

  • joystick_soft_reset - General soft reset function

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * \file 
 * \brief Joystick Click example
 * 
 * # Description
 * This application configures and enables use of the joystick.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initialization driver enables - device,
 *  sets default configuration and starts write log.
 * 
 * ## Application Task  
 * (code snippet) This is a example which demonstrates the use of Joystick Click board.
 * Joystick Click communicates with register via I2C by write and read from register,
 * read joystick position and press button state.
 * Results are being sent to the Usart Terminal where you can track their changes.
 * All data logs on usb uart when the sensor is triggered.
 * 
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "joystick.h"

// ------------------------------------------------------------------ VARIABLES

static joystick_t joystick;
static log_t logger;

uint8_t position;
uint8_t button_state;
uint8_t position_old = 1;
uint8_t button_state_old = 1;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    joystick_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    joystick_cfg_setup( &cfg );
    JOYSTCIK_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    joystick_init( &joystick, &cfg );

    Delay_ms ( 100 );

    joystick_default_cfg( &joystick );

    log_printf( &logger,  "*********************\r\n" );
    log_printf( &logger,  "    Configuration    \r\n" );
    log_printf( &logger,  "*********************\r\n" );
    log_printf( &logger,  "    Joystick Click   \r\n" );
    log_printf( &logger,  "*********************\r\n" );

    Delay_ms ( 100 );
}

void application_task ( void ) 
{
    //  Task implementation.

    button_state = joystick_press_button( &joystick );

    position = joystick_get_position( &joystick );

    Delay_ms ( 10 );

    if ( ( button_state == 1 ) && ( button_state_old == 0 ) )
    {
        button_state_old = 1;

        log_printf( &logger, "  Button is pressed \r\n" );
        log_printf( &logger, "*********************\r\n" );
    }

    if ( ( button_state == 0 ) && ( button_state_old == 1 ) )
    {
        button_state_old = 0;
    }

    if ( position_old != position )
    {
        switch ( position )
        {
            case 0 :
            {
                log_printf( &logger,"    Start position    \r\n" );
                break;
            }
            case 1 :
            {
                log_printf( &logger, "         Top    \r\n" );
                break;
            }
            case 2 :
            {
                log_printf( &logger, "      Top-Right    \r\n" );
                break;
            }
            case 3 :
            {
                log_printf( &logger, "        Right    \r\n" );
                break;
            }
            case 4 :
            {
                log_printf( &logger, "     Bottom-Right    \r\n" );
                break;
            }
            case 5 :
            {
                log_printf( &logger, "        Bottom    \r\n" );
                break;
            }
            case 6 :
            {
                log_printf( &logger, "     Bottom-Left    \r\n" );
                break;
            }
            case 7 :
            {
                log_printf( &logger, "         Left    \r\n" );
                break;
            }
            case 8 :
            {
                log_printf( &logger, "       Top-Left    \r\n" );
                break;
            }
        }

        log_printf( &logger, "*********************\r\n" );

        position_old = position;

        Delay_ms ( 100 );
    }
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}


// ------------------------------------------------------------------------ END

Additional Support

Resources

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