Improve data representation with STM32F031K6 and TLC5926
Bring life to your app's numbers and codes
Published Oct 01, 2024
Click board™
AlphaNum G Click
Dev. board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
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Hardware Overview
How does it work?
AlphaNum G Click is based on one green two digits 14-segment alphanumeric display with leading dots and two TLC5926s, 16-bit constant-current LED-sink drivers from Texas Instruments. This display consists of two sets of 14 LEDs arranged in a rectangular starburst fashion, where each of the 14 LEDs is called a segment. The segment forms part of a numerical digit (decimal and hex) or ISO basic Latin alphabet to be displayed when illuminated. The fifteenth segment of each set is a comma, suitable for displaying a decimal number. Two TLC5926s drive this display with constant currents in the sink
configuration. The TLC5926 is a 256-step programmable global current gain with constant current adjusted by an external resistor; in this case, it is kept around 8mA per segment. This Click board™ uses the SPI serial interface of the mikroBUS™ socket to communicate with the host MCU. There are four additional pins, two for each TLC5926: data latch pins marked as LE1 and LE2, routed to the CS and RST pins of the mikroBUS™ socket, and display segment select pins labeled as NS and NS# routed to the INT and PWM pins of the mikroBUS™ socket. Those latch pins are data strobe input pins where serial data is transferred to
the respective latch when they are in a high logic state. The data is latched when those pins are in a low logic state. Output enable pins are active LOW with enabled output drivers; otherwise, with a high state, the display is turned OFF. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the 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 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 AlphaNum G Click driver.
Key functions:
alphanumg_write_character- This function displays characters on the left and right LED segmentsalphanumg_write_number- This function displays numbers on the left and right LED segments
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 AlphaNumG Click example
*
* # Description
* This example showcases the initialization and configuration of the logger and Click modules
* and shows how to display characters and numbers on both LED segments of the Click.
*
* The demo application is composed of two sections :
*
* ## Application Init
* This function initializes and configures the logger and Click modules.
*
* ## Application Task
* This function sets the time interval at which the symbols are displayed on the LED
* segments and shows a few characters and numbers.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "alphanumg.h"
static alphanumg_t alphanumg;
static log_t logger;
void application_init ( void ) {
log_cfg_t log_cfg; /**< Logger config object. */
alphanumg_cfg_t alphanumg_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.
alphanumg_cfg_setup( &alphanumg_cfg );
ALPHANUMG_MAP_MIKROBUS( alphanumg_cfg, MIKROBUS_1 );
err_t init_flag = alphanumg_init( &alphanumg, &alphanumg_cfg );
if ( SPI_MASTER_ERROR == init_flag ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void ) {
alphanumg_set_display_interval( &alphanumg, 1000 );
alphanumg_write_character( &alphanumg, 'M', 'E' );
alphanumg_write_character( &alphanumg, '@', '?' );
alphanumg_write_number( &alphanumg, 0, 1 );
alphanumg_write_number( &alphanumg, 1, 2 );
alphanumg_write_number( &alphanumg, 2, 3 );
alphanumg_write_number( &alphanumg, 3, 4 );
}
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
Category:LED Segment
