Intermediate
30 min

Have smooth and precise movement control with 2765 and STM32F030R8

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Joystick 3 Click with Nucleo-64 with STM32F030R8 MCU

Published Feb 26, 2024

Click board™

Joystick 3 Click

Dev Board

Nucleo-64 with STM32F030R8 MCU

Compiler

NECTO Studio

MCU

STM32F030R8

Perform the full range of motion in all directions

A

A

Hardware Overview

How does it work?

Joystick 3 Click is based on 2765, a high-quality mini 2-axis analog-type thumbstick from Adafruit Industries. This type of joystick has a self-centering feature that allows it to center itself the moment when you release the joystick. It also contains a comfortable cup-type black knob/cap, which gives the feel of a thumbstick, making it very similar to the 'analog' joysticks on PSP joysticks, suitable for numerous applications as a human-machine interface. It comprises two 10kΩ potentiometers, one for up/down and another for left/right direction, used as dual adjustable voltage dividers providing 2-axis analog input in a control stick form. With the joystick fully assembled and functioning, the voltage will

follow the motion of the thumbstick as it is moved around. The measurements of the potentiometer resistance change are needed to read the joystick's physical position. For that reason, the MCP3204, a 12-bit A/D converter from Microchip, connects the joystick with mikroBUS™ using a simple serial interface compatible with the SPI protocol to determine the value of the joystick's X and Y. As the MCP3204 has a resolution of 12 bits, the values on each analog channel (axis) can vary from 0 to 4095. So, if the stick is moved on the X axis from one end to the other, the X values will change from 0 to 4095, and a similar thing happens when moved along the Y axis. The value of the joystick staying in its center

position is around 2048. Also, the MCP3204 is capable of conversion rates of up to 100ksps. This Click board™ can only be operated from a 3.3V logic voltage level. Therefore, the board must perform appropriate logic voltage 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 3 Click top side image
Joystick 3 Click lateral side image
Joystick 3 Click bottom side image

Features overview

Development board

Nucleo-64 with STM32F030R8 MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin

headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is

provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.

Nucleo 64 with STM32F030R8 MCU double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

ARM Cortex-M0

MCU Memory (KB)

64

Silicon Vendor

STMicroelectronics

Pin count

64

RAM (Bytes)

8192

You complete me!

Accessories

Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Click Shield for Nucleo-64 accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
SPI Chip Select
PB12
CS
SPI Clock
PB3
SCK
SPI Data OUT
PB4
MISO
SPI Data IN
PB5
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Schematic

Joystick 3 Click Schematic schematic

Step by step

Project assembly

Click Shield for Nucleo-64 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Nucleo-64 with STM32F030R8 MCU as your development board.

Click Shield for Nucleo-64 front image hardware assembly
Nucleo 64 with STM32F401RE MCU front image hardware assembly
EEPROM 13 Click front image hardware assembly
Prog-cut hardware assembly
Nucleo-64 with STM32XXX MCU MB 1 Mini B Conn - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Clicker 4 for STM32F4 HA MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output via Debug Mode

1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.

2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.

DEBUG_Application_Output

Software Support

Library Description

This library contains API for Joystick 3 Click driver.

Key functions:

  • joystick3_read_raw_adc This function reads the raw ADC for X and Y axis by using SPI serial interface.

  • joystick3_get_angle This function calculates and returns the joystick angle in degrees from raw ADC values for X and Y axis.

  • joystick3_get_position This function calculates and returns the joystick position flag from raw ADC values for X and Y axis.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * @file main.c
 * @brief Joystick 3 Click example
 *
 * # Description
 * This example demonstrates the use of the joystick 3 click board by reading
 * and displaying the raw ADC for X and Y axis, as well as the joystick angle and position
 * calculated from those ADC readings.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and logger.
 *
 * ## Application Task
 * Reads the raw ADC measurements for X and Y axis, and calculates the joystick angle and position
 * from those readings. The results will be displayed on the USB UART approximately every 100ms.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "joystick3.h"

static joystick3_t joystick3;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    joystick3_cfg_t joystick3_cfg;  /**< Click config object. */

    /** 
     * 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.
    joystick3_cfg_setup( &joystick3_cfg );
    JOYSTICK3_MAP_MIKROBUS( joystick3_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == joystick3_init( &joystick3, &joystick3_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    uint16_t raw_x, raw_y;
    if ( JOYSTICK3_OK == joystick3_read_raw_adc ( &joystick3, &raw_x, &raw_y ) )
    {
        log_printf ( &logger, " RAW X: %u\r\n RAW Y: %u\r\n", raw_x, raw_y );
        log_printf ( &logger, " Joystick angle: %.1f degrees\r\n", joystick3_get_angle ( raw_x, raw_y ) );
        log_printf ( &logger, " Joystick position: " );
        switch ( joystick3_get_position ( raw_x, raw_y ) )
        {
            case JOYSTICK3_POSITION_NEUTRAL:
            {
                log_printf ( &logger, "NEUTRAL" );
                break;
            }
            case JOYSTICK3_POSITION_UP:
            {
                log_printf ( &logger, "UP" );
                break;
            }
            case JOYSTICK3_POSITION_UPPER_RIGHT:
            {
                log_printf ( &logger, "UPPER-RIGHT" );
                break;
            }
            case JOYSTICK3_POSITION_RIGHT:
            {
                log_printf ( &logger, "RIGHT" );
                break;
            }
            case JOYSTICK3_POSITION_LOWER_RIGHT:
            {
                log_printf ( &logger, "LOWER-RIGHT" );
                break;
            }
            case JOYSTICK3_POSITION_DOWN:
            {
                log_printf ( &logger, "DOWN" );
                break;
            }
            case JOYSTICK3_POSITION_LOWER_LEFT:
            {
                log_printf ( &logger, "LOWER-LEFT" );
                break;
            }
            case JOYSTICK3_POSITION_LEFT:
            {
                log_printf ( &logger, "LEFT" );
                break;
            }
            case JOYSTICK3_POSITION_UPPER_LEFT:
            {
                log_printf ( &logger, "UPPER-LEFT" );
                break;
            }
            default:
            {
                log_printf ( &logger, "UNKNOWN" );
                break;
            }
        }
        log_printf ( &logger, "\r\n\n" );
        Delay_ms ( 100 );
    }
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

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

Additional Support

Resources

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