Provide precise haptic feedback for a wide array of electronic applications with DA7280 and STM32F446RE
Capable of operating both linear resonant actuator (LRA) and eccentric rotating mass (ERM) actuators
Published Oct 08, 2024
Click board™
Haptic 4 Click
Dev. board
Nucleo 64 with STM32F446RE MCU
Compiler
NECTO Studio
MCU
STM32F446RE
LRA/ERM haptic driver with multiple input triggers, integrated waveform memory and wideband support
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Hardware Overview
How does it work?
Haptic 4 Click is based on the DA7280, a haptic driver designed to drive linear resonant actuator (LRA) and eccentric rotating mass (ERM) actuators from Renesas. The DA7280 stands out with its automatic closed-loop LRA resonant frequency tracking feature, ensuring consistent performance across various conditions, including production tolerances and mechanical coupling effects. Depending on the register configuration, its capability to drive both LRA and ERM actuators originates from its differential output drive architecture and continuous motion sensing, which foster calibration-free operation and reduce software complexity. The DA7280's architecture is optimized for wideband operation, unlocking the full potential of the latest wideband and multidirectional LRAs. This feature makes it ideal for many applications, from wearables and electronic
peripherals to automotive, industrial settings, and AR/VR controllers. The DA7280's unique ability to control the drive level across loads connected to the OUT terminal and to sense actuator movement via a current-regulated loop and high-frequency PWM modulation enhances its utility. With support for six independent haptic sequences triggered via the mikroBUS™ pins (GP0, GP1, and GP2) without host interaction and options for external control via I2C or PWM signal, the DA7280 ensures versatile haptic feedback configurations. Using the I2C interface, this Click board™ can communicate with the host MCU supporting frequency up to 1MHz. The DA7280 is also capable of closed-loop actuator monitoring while driving to enable calibration-free playback, frequency tracking (LRA only), Active Acceleration, Rapid Stop, and actuator diagnostics available on the IRQ pin of the mikroBUS™ socket.
Continuous resonant frequency tracking can be enabled while driving an LRA to track the mechanical resonance of the actuator through closed-loop control. This feature maximizes electrical to mechanical energy conversion efficiency for narrowband actuators and is especially useful in applications such as operating system notifications and alarms. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
Features overview
Development board
Nucleo-64 with STM32F446RE 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.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
512
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
131072
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.
Vibration ERM Motor 9K RPM 3V (VC1026B002F - old MPN C1026B002F) represents a compact-size Eccentric Rotating Mass (ERM) motor designed by Vybronics. This type of motor contains a small eccentric weight on its rotor, so while rotating, it also produces a vibration effect often used for haptic feedback on many small handheld devices. Due to its circular shape with a diameter of 10mm, the VC1026B002F is often referred to as a coin motor. The main characteristics of this vibration motor are its supply voltage, in this case, 3VDC, maximum rated current of 85mA, and the rated speed of 9000RPM, which produces the highest G force/vibration energy of 0.80GRMS. It can also be used with self-adhesive tape to mount it on your PCB or the inner wall of your product's housing.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 64 with STM32F446RE MCU as your development board.
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 Haptic 4 Click driver.
Key functions:
haptic4_check_communication- This function checks the communication by reading and verifying the chip IDhaptic4_set_vibration_level- This function sets the motor vibration levelhaptic4_get_vibration_level- This function reads the motor vibration level
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 main.c
* @brief Haptic 4 Click example
*
* # Description
* This example demonstrates the use of Haptic 4 click board by controlling
* the attached motor vibration level.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* Changes the motor vibration level every 2 seconds between MAX and MIN,
* and displays the currently set level on the USB UART.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "haptic4.h"
static haptic4_t haptic4;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
haptic4_cfg_t haptic4_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.
haptic4_cfg_setup( &haptic4_cfg );
HAPTIC4_MAP_MIKROBUS( haptic4_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == haptic4_init( &haptic4, &haptic4_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( HAPTIC4_ERROR == haptic4_default_cfg ( &haptic4 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float vibration_level;
if ( HAPTIC4_OK == haptic4_set_vibration_level ( &haptic4, HAPTIC4_VIBRATION_LEVEL_MAX ) )
{
if ( HAPTIC4_OK == haptic4_get_vibration_level ( &haptic4, &vibration_level ) )
{
log_printf( &logger, " Vibration level: %.3f \r\n\n", vibration_level );
}
}
Delay_ms ( 2000 );
if ( HAPTIC4_OK == haptic4_set_vibration_level ( &haptic4, HAPTIC4_VIBRATION_LEVEL_MIN ) )
{
if ( HAPTIC4_OK == haptic4_get_vibration_level ( &haptic4, &vibration_level ) )
{
log_printf( &logger, " Vibration level: %.3f \r\n\n", vibration_level );
}
}
Delay_ms ( 2000 );
}
int main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
