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Revolutionize your data presentation with MCP23S17 and PIC18F45K22

See it in 2x16: Clear, Concise, Captivating!

LCD mini Click with EasyPIC v7

Published Jul 01, 2023

Click board™

LCD mini Click

Development board

EasyPIC v7

Compiler

NECTO Studio

MCU

PIC18F45K22

Elevate your solution's display capabilities, enhance the user experience, and unleash the full potential of an LCD display through seamless integration with an SPI adapter!

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Hardware Overview

How does it work?

LCD Mini Click is based on the MCP23S17, a 16-bit I/O expander with a serial interface from Microchip. The MCP23S17 has an external reset input and a configurable interrupt source, which can also be configured as active-high or active-low. This bidirectional I2C expander acts as a bridge between the host MCU to four data bit pins, an enable control pin, and a register select pin of the display. In order to work, the enable pin should be held HIGH. The register-select pin toggles between command mode (logic LOW) and data mode (logic HIGH). The brightness of the backlight LED can be controlled directly over the

host MCU, but for the contrast of the LCD, there is the MCP4161, an 8-bit single SPI digital POT with non-volatile memory from Microchip. LCD Mini Click uses a standard 4-wire SPI serial interface from both the I2C expander and the digital potentiometer to communicate with the host MCU. The MCP23S17 supports a high-speed SPI interface of up to 10MHz and can be selected over the CS pin and reset over the RST pin. It sends interrupts over the INT pin. The MCP4161 also supports high-speed SPI of up to 10MHz and can be selected over the CS2 pin. The PWM pin can control the brightness of the LCD's backlight LED.

The LMB162XFW display with an appropriate cable does not come with the LCD Mini Click adapter board and is offered separately. However, the LCD Mini Click has an appropriate connector to interface the LCD. 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.

LCD mini Click top side image
LCD mini Click bottom side image

Features overview

Development board

EasyPIC v7 is the seventh generation of PIC development boards specially designed to develop embedded applications rapidly. It supports a wide range of 8-bit PIC microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB-B. 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, EasyPIC v7 allows you to connect accessory boards, sensors, and custom electronics more efficiently than ever. Each part of

the EasyPIC 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 various external power sources, including an external 12V power supply, 7-23V AC or 9-32V 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. These sockets cover a wide range of 8-bit PIC MCUs, from PIC10F, PIC12F, PIC16F, PIC16Enh, PIC18F, PIC18FJ, and PIC18FK families. EasyPIC 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.

EasyPIC v7 horizontal image

Microcontroller Overview

MCU Card / MCU

PIC18F45K22

Architecture

PIC

MCU Memory (KB)

32

Silicon Vendor

Microchip

Pin count

40

RAM (Bytes)

1536

You complete me!

Accessories

LCD mini display, based on the LMB162XFW, is a compact and versatile SPI-controlled LCD mini display featuring a sharp 2x16 pixel resolution. Its striking deep blue display color contrasts beautifully with the light yellow-green display data, ensuring clear and vibrant visuals. With a compact form factor, the display measures just 53.0x20.0x9.1mm (maximum dimensions), making it suitable for space-constrained applications. This mini display's SPI control enables seamless integration into various electronic projects, while its elegant color combination enhances visibility. Whether used in industrial instruments, consumer devices, or DIY electronics, the LCD mini display offers a sleek and functional solution for presenting essential data and information in a visually appealing manner.

LCD mini Click accessories image

Used MCU Pins

mikroBUS™ mapper

DIGIPOT Chip Select
RA2
AN
Expander Reset
RE1
RST
SPI Chip Select
RE0
CS
SPI Slock
RC3
SCK
SPI Data OUT
RC4
MISO
SPI Data IN
RC5
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
PWM Signal
RC0
PWM
Expander Interrupt
RB0
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

LCD mini Click Schematic schematic

Step by step

Project assembly

EasyPIC v7 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v7 as your development board.

EasyPIC v7 front image hardware assembly
GNSS2 Click front image hardware assembly
MCU DIP 40 hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
EasyPIC v7 Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
EasyPIC PRO v7a Display Selection Necto Step hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for LCD mini Click driver.

Key functions:

  • lcdmini_set_backlight - Set backlight function

  • lcdmini_set_contrast - Set contrast function

  • lcdmini_display_text - LCD mini display text

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * @file main.c
 * @brief LCDmini Click example
 *
 * # Description
 * This is an example that demonstrates the use of the LCD mini Click board.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization driver enables - SPI, performing hardware reset, default config, 
 * setting up the backlight, and entering text to be written.
 *
 * ## Application Task
 * This example shows the written text, then the text is moved left, 
 * with changing between rows of the LCD screen.
 *
 * @note If the screen isn't initialized you may need to restart the device.
 * 
 * @author Stefan Ilic
 *
 */

#include "board.h"
#include "log.h"
#include "lcdmini.h"

static lcdmini_t lcdmini;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lcdmini_cfg_t lcdmini_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.
    lcdmini_cfg_setup( &lcdmini_cfg );
    LCDMINI_MAP_MIKROBUS( lcdmini_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == lcdmini_init( &lcdmini, &lcdmini_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    lcdmini_hw_reset( &lcdmini );
    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "   SPI LCD Config    \r\n" );
    log_printf( &logger, " Clear LCD display   \r\n" );
    log_printf( &logger, "     Cursor OFF      \r\n" );
    
    if ( LCDMINI_ERROR == lcdmini_default_cfg ( &lcdmini ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "  Setting Backlight  \r\n" );
    lcdmini_set_backlight ( &lcdmini, 1 );
    Delay_ms( 100 );
    
    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "  Set Contrast: 200  \r\n" );
    lcdmini_set_contrast( &lcdmini, 200 );
    Delay_ms( 100 );
    
    log_info( &logger, " Application Task " );
    
    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "     Display text    \r\n" );
    log_printf( &logger, "---------------------\r\n" );
    
    lcdmini_display_text ( &lcdmini, 1, 6, "Mikro E" );
    lcdmini_display_text ( &lcdmini, 2, 2, "LCD mini Click" ); 
    lcdmini_display_text ( &lcdmini, 3, 2, "LCD mini Click" ); 
    lcdmini_display_text ( &lcdmini, 4, 6, "Mikro E" );
    Delay_ms( 500 );
}

void application_task ( void )
{
    Delay_ms( 500 );
    lcdmini_send_cmd( &lcdmini, LCDMINI_SHIFT_LEFT ); 
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END

Additional Support

Resources