Capture, track, and manage information with ease using LV3296 and ATmega1284
Streamline inventory management with precision
Published Oct 02, 2023
Click board™
Barcode Click
Dev Board
EasyAVR v7
Compiler
NECTO Studio
MCU
ATmega1284
The purpose of this scanner is to enhance retail efficiency by quickly and accurately capturing product information
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Hardware Overview
How does it work?
Barcode Click is based on the LV3296 from Rakinda. This is the advanced barcode scanner/reader module which features the patented UIMG®, a computerized image recognition system technology that supports all mainstream 1D and standard 2D barcode types (for example - PDF417, QR Code M1/M2/Micro and Data Matrix) as well as GS1-DataBar™(RSS) (Limited/Stacked/Expanded versions). It can read barcodes on virtually any medium, including paper, plastic, mobile phones, LCD displays, etc. Thanks to the used area-imaging and UIMG® technologies, the device is able to scan barcodes rotated to any angle, with great speed and precision. The LV3296 scanner module uses a flat cable to connect to the click board™, via the ZIF FPC connector on the back side of the PCB. This flat cable carries all the signals used in communication between the LV3296 module and the host MCU, such as the RX, TX, buzzer, USB, interrupt, reset, and scanning trigger lines. The communication with Barcode click is done by utilizing two types of connection it offers - UART (TTL232) and USB. When the click board™ is placed into the mikroBUS™ socket, it will be able to exchange data with the UART module of the
MCU, via the standard mikroBUS™ RX and TX pins. When the USB cable is connected to the micro USB port on the click board itself, it can be identified either as the virtual USB port, a HID keyboard device or an HID POS device. HID devices do not require any special PC drivers, while the virtual USB device does. Many options and parameters of the Barcode click are configurable. Barcode click configuration is very easy and intuitive - it is enough to read special configuration messages, encoded into barcodes that can be found in the LV3296 user's guide. It is not even necessary to print them on paper - it is enough to show them on screen and scan them from there. Enter Setup message should be scanned first, followed by the desired configuration message. After successful configuration indicated by a short beep sound, the Exit Setup message should be scanned. The device features a very extensive set of encoded configuration commands, which include storing and recal of user default values, along with the factory defaults. When the Barcode device is first powered up, it will sound a greeting message, which indicates the successful initialization. The device is now ready to scan. Pressing the onboard TRIG button or pulling the
PWM pin of the mikroBUS™ slot to a LOW logic level for at least 10ms, will trigger the barcode scan. It will turn on two LEDs and project a circle shaped aiming pattern on the surface it is aimed at, scanning it for a valid barcode. Both LEDs and the aiming pattern can be turned off in the configuration. A short beep sound and a blink of the Good Read indication onboard LED (GR) will indicate a successful barcode decoding and after releasing the TRIG line (configurable), the device will send the decoded information to the selected interface. Barcode click can report errors, with a distinctive error message sound - e.g. when the device is configured to use onboard micro USB, but it is not connected to the host USB device, it will sound an error if scanning is attempted. The RST button is used to reset the device. Pressing the RST button or pulling the RST line, routed to the mikroBUS™ RST pin to a LOW logic level for 100us to 500us will cause a device reset, followed by the greeting message sound. It should be noted that the device should not be reset too frequently; at least 2 seconds delay should exist between the reset cycles.
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.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
128
Silicon Vendor
Microchip
Pin count
40
RAM (Bytes)
16384
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 EasyAVR v7 as your development board.
Track your results in real time
Application Output
This Click board can be interfaced and monitored in two ways:
Application Output- Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
UART Terminal- Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.
Software Support
Library Description
This library contains API for Barcode Click driver.
Key functions:
barcode_enable_scaning- Set PWM pin statebarcode_generic_read- Generic read 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 Barcode Click example
*
* # Description
* This example reads and processes data from Barcode clicks.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes driver.
*
* ## Application Task
* Reads the received data.
*
* ## Additional Function
* - barcode_process( ) - The general process of collecting presponce
* that sends a module.
*
* \author Nemanja Medakovic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "barcode.h"
#include "string.h"
#define PROCESS_COUNTER 2000
#define PROCESS_RX_BUFFER_SIZE 300
// ------------------------------------------------------------------ VARIABLES
static barcode_t barcode;
static log_t logger;
// ------------------------------------------------------- ADDITIONAL FUNCTIONS
static void barcode_process ( void )
{
uint16_t rsp_size;
uint16_t rsp_cnt = 0;
char uart_rx_buffer[ PROCESS_RX_BUFFER_SIZE ] = { 0 };
uint16_t check_buf_cnt;
uint16_t process_cnt = PROCESS_COUNTER;
while( process_cnt > 0 )
{
rsp_size = barcode_generic_read( &barcode, &uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );
if ( rsp_size > 0 )
{
// Validation of the received data
for ( check_buf_cnt = 0; check_buf_cnt < rsp_size; check_buf_cnt++ )
{
if ( uart_rx_buffer[ check_buf_cnt ] == 0 )
{
uart_rx_buffer[ check_buf_cnt ] = 13;
}
}
log_printf( &logger, "%s", uart_rx_buffer );
// Clear RX buffer
memset( uart_rx_buffer, 0, PROCESS_RX_BUFFER_SIZE );
}
else
{
process_cnt--;
// Process delay
Delay_ms( 1 );
}
}
}
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
barcode_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, "---> BarCode Click Init <---" );
// Click initialization.
barcode_cfg_setup( &cfg );
BARCODE_MAP_MIKROBUS( cfg, MIKROBUS_1 );
barcode_init( &barcode, &cfg );
Delay_ms( 500 );
}
void application_task ( void )
{
barcode_enable_scaning( &barcode, BARCODE_LOGIC_ON );
barcode_process( );
barcode_enable_scaning( &barcode, BARCODE_LOGIC_OFF );
Delay_ms( 2000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
