Ensure clear and visible information presentation with JS1-5213AE and PIC18F47K42

Illuminate your data with decimal precision

Published Jun 18, 2023

Click board™

7seg Click

Dev. board

EasyPIC v8

Compiler

NECTO Studio

MCU

PIC18F47K42

Straightforward solution for incorporating numeric or hexadecimal displays into electronic applications

Hardware Overview

How does it work?

7seg Click is based on two seven-segment red LED displays, the JS1-5213AE from Ningbo Junsheng Electronics, driven by the SN74HC595D, an 8-bit serial-in, parallel-out shift register module from Texas Instruments. The JS1-5213AE display consists of seven LEDs arranged in a rectangular fashion, where each of the seven LEDs is called a segment because when illuminated, the segment forms part of a numerical digit (both decimal and hex) to be displayed. With dimensions of 17.5x12.4x8.4mm and a decimal point, these displays are also characterized by a wide viewing

range and ultra-segment intensity. This board is suitable for numeric or hexadecimal displays, such as clocks, timers, counters, or similar applications. As mentioned, this Click board™ communicates with MCU through a standard SPI interface across SN74HC595D with a maximum frequency of 5MHz. In addition to the SPI communication, the 7seg Click uses two additional pins for the direct shift register override function and display activation routed to the RST and PWM pins of the mikroBUS™ socket. Setting the PWM pin to logic high state turns the displays ON. After that, users

can see the functionality of the 7seg click by showing numbers or characters on the left and right displays. 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

EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 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

PIC

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

8192

Used MCU Pins

mikroBUS™ mapper

RE1

RST

SPI Chip Select

RE0

SPI Clock

RC3

SCK

SPI Data OUT

RC4

MISO

SPI Data IN

RC5

MOSI

Power Supply

3.3V

Ground

GND

PWM Signal

RC0

PWM

INT

SCL

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

EasyPIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.

NECTO Output Selection Step Image hardware assembly

In the advanced settings, pay special attention to the Redirect standard output field. By default, it is set to Application output as the method of displaying final results. To show results via a UART terminal, select the “UART” option in that field and click the “SAVE” button. You will be returned to the Compiler field, and now you can move on to the next step by pressing the “NEXT” button.

GNSS2 Click front image hardware assembly

EasyPIC v8 Access DIPMB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

Necto DIP image step 7 hardware assembly

Software Support

Library Description

This library contains API for 7seg Click driver.

Key functions:

c7seg_display_mode - This function sets display state for 7seg Click
c7seg_write_data_number - This function writes left and right number on 7seg display
c7seg_write_data_character - This function writes left and right character on 7seg display

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 7seg Click example
 * 
 * # Description
 * Example code consist of two sections: AppInit and AppTask,
 * and shows number or character on 7seg display.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Application Init performs Logger and Click Initialization.
 * 
 * ## Application Task  
 * Application Task shows functionality of the 7seg Click,
 * shows number or character on left and right display.
 *  
 * \author Mihajlo Djordjevic
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "c7seg.h"

// ------------------------------------------------------------------ VARIABLES

static c7seg_t c7seg;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    c7seg_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, "---- Application Init ----" );

    //  Click initialization.

    c7seg_cfg_setup( &cfg );
    C7SEG_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    c7seg_init( &c7seg, &cfg );
    
    c7seg_default_cfg ( &c7seg );
    Delay_ms ( 1000 );
}

void application_task ( void )
{
    uint8_t counter;

    c7seg_display_mode( &c7seg, C7SEG_DISPLAY_ON );
    Delay_ms ( 1000 );
    
    for ( counter = 0; counter < 9; counter ++ )
    {
        c7seg_write_data_number( &c7seg, counter, counter + 1 );
        Delay_ms ( 1000 );
    }
    Delay_ms ( 1000 );

    for ( counter = 65; counter < 90; counter ++ )
    {
        c7seg_write_data_character( &c7seg, counter, counter + 1 );
        Delay_ms ( 1000 );
    }
    Delay_ms ( 1000 );

    c7seg_display_mode( &c7seg, C7SEG_DISPLAY_OFF );
    Delay_ms ( 1000 );
}

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