Create a custom voice-activated system with IA611 and STM32F031K6
Say it, and it shall be done!
Published Oct 01, 2024
Click board™
Smart Mic Click
Dev. board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
Identify a particular spoken keyword or trigger phrase within a larger sentence or command to wake up any embedded system
A
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Hardware Overview
How does it work?
Smart Mic Click is based on the IA611, a flexible, low-power, highly integrated voice and audio processor system from Knowles Electronics. The IA611 includes an advanced Knowles audio-optimized DSP sub-system designed to calculate intensive audio-processing algorithms with low power consumption. It also comprises a System Control Unit (SCU) that handles power management states such as sleep mode and generates internal clock signals. The IA611, “Always-On” Acoustic Processor, features a voice wake and voice ID keyword detector, a three-second buffer, and Knowles’ proven high-performance acoustic SiSonicTM MEMS technology in a single package. The IA611 can be in one of the following operating modes. The Bootloader is a mode where, after Power-Up, the IA611 waits for firmware download or use case setup. In Instruction mode, the IA611 waits for use case setup after firmware download, while in Open DSP Mode, the IA611 enables third-party algorithms. In Normal operational mode, the IA611 can be in software or hardware pass-through mode, which acts as a mic to the host.
The Voice Wake Mode allows low-power voice wake-up based on the detection of either a built-in keyword (OEM keyword), a user-trained keyword (user keyword), or a user-conditioned OEM keyword (Voice ID). In this mode, the IA611 monitors the microphone stream for acoustic activity. When acoustic activity is detected, the IA611 automatically enters a slightly higher power mode to analyze the speech utterance for the presence of the wake-up keyword. When a valid keyword is detected, the IA611 asserts an interrupt routed to the INT pin of the mikroBUS™ socket to trigger a complete system wake-up. If a keyword is not detected, the device returns to the ultra-low-power mode until the acoustic activity is detected again. The IA611 implements various control interfaces, including UART, SPI, and an I2C slave interface with a control interface and audio interface port. Depending on the desired interface, the user must populate the selected jumper to activate that interface (SPI, I2C, or UART). Using an I2C interface, the user is given the option of additional activation of 4.7kΩ pull-up resistors on I2C lines,
populating jumpers marked with PULL-UP. The IA611 does not require a specific Power-Up sequence but requires a voltage of 1.8V for its supply and logic part to work correctly. Therefore, a small regulating LDO is used, the TC1015, providing a 1.8V out of 3.3V mikroBUS™ power rail, alongside Enable feature through the EN pin routed to the RST pin of the mikroBUS™ socket offering a switch operation to turn ON/OFF power delivery to the TC1015. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the TXS0108E voltage-level translator. The interface lines are routed to the voltage-level translator allowing this Click board™ to work with 3.3V MCUs properly. 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.
Features overview
Development board
Nucleo 32 with STM32F031K6 MCU board provides an affordable and flexible platform for experimenting with STM32 microcontrollers in 32-pin packages. Featuring Arduino™ Nano connectivity, it allows easy expansion with specialized shields, while being mbed-enabled for seamless integration with online resources. The
board includes an on-board ST-LINK/V2-1 debugger/programmer, supporting USB reenumeration with three interfaces: Virtual Com port, mass storage, and debug port. It offers a flexible power supply through either USB VBUS or an external source. Additionally, it includes three LEDs (LD1 for USB communication, LD2 for power,
and LD3 as a user LED) and a reset push button. The STM32 Nucleo-32 board is supported by various Integrated Development Environments (IDEs) such as IAR™, Keil®, and GCC-based IDEs like AC6 SW4STM32, making it a versatile tool for developers.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
32
Silicon Vendor
STMicroelectronics
Pin count
32
RAM (Bytes)
4096
You complete me!
Accessories
Click Shield for Nucleo-32 is the perfect way to expand your development board's functionalities with STM32 Nucleo-32 pinout. The Click Shield for Nucleo-32 provides two mikroBUS™ sockets to add any functionality from our ever-growing range of Click boards™. We are fully stocked with everything, from sensors and WiFi transceivers to motor control and audio amplifiers. The Click Shield for Nucleo-32 is compatible with the STM32 Nucleo-32 board, providing an affordable and flexible way for users to try out new ideas and quickly create prototypes with any STM32 microcontrollers, choosing from the various combinations of performance, power consumption, and features. The STM32 Nucleo-32 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/programmer and come with the STM32 comprehensive software HAL library and various packaged software examples. This development platform provides users with an effortless and common way to combine the STM32 Nucleo-32 footprint compatible board with their favorite Click boards™ in their upcoming projects.
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 32 with STM32F031K6 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 Smart Mic Click driver.
Key functions:
smartmic_wait_keywordThis function waits for a keyword event, reads it, and returns the keyword ID number.smartmic_download_keywordThis function downloads keyword models to the module.smartmic_voice_makeThis function performs the voice-make feature. It stops the route, then sets the digital gain to 20db, sample rate to 16K, frame size to 16 ms, and finally, it selects route 6 and configures algorithm parameters.
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 SmartMic Click example
*
* # Description
* This example demonstrates the use of Smart Mic click board by programming
* it with 4 different keywords, and then waiting for a keyword event,
* parsing it and displaying on the USB UART.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration
* which programs the device with system config, firmware, and 4 keywords
* ("Hello VoiceQ","Switch The Light","Next Song","Baidu Yixia") binaries.
*
* ## Application Task
* Waits for a keyword event, parses it and displays on the USB UART
* an appropriate message for the detected keyword.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "smartmic.h"
static smartmic_t smartmic;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
smartmic_cfg_t smartmic_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.
smartmic_cfg_setup( &smartmic_cfg );
SMARTMIC_MAP_MIKROBUS( smartmic_cfg, MIKROBUS_1 );
if ( SMARTMIC_OK != smartmic_init( &smartmic, &smartmic_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_printf( &logger, " Configuring device... \r\n" );
if ( SMARTMIC_OK != smartmic_default_cfg ( &smartmic ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
switch ( smartmic_wait_keyword ( &smartmic ) )
{
case SMARTMIC_OEM1_KWD_DETECTED:
{
log_printf ( &logger, " Hello VoiceQ keyword detected!\r\n" );
break;
}
case SMARTMIC_OEM2_KWD_DETECTED:
{
log_printf ( &logger, " Switch The Light keyword detected!\r\n" );
break;
}
case SMARTMIC_OEM3_KWD_DETECTED:
{
log_printf ( &logger, " Next Song keyword detected!\r\n" );
break;
}
case SMARTMIC_OEM4_KWD_DETECTED:
{
log_printf ( &logger, " Baidu YiXia keyword detected!\r\n" );
break;
}
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
