Beginner
10 min

Achieve safety isolation from high voltage with ISOM8710 and PIC18F46K22

High voltage, low worries

Opto 7 Click with EasyPIC v7

Published Dec 22, 2023

Click board™

Opto 7 Click

Dev Board

EasyPIC v7

Compiler

NECTO Studio

MCU

PIC18F46K22

Safety shield that you can add to electronic systems, especially in applications like power supplies, electricity meters, motor drives, and automation systems

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Hardware Overview

How does it work?

Opto 7 Click is based on two ISOM8710s, high-speed single-channel opto-emulators from Texas Instruments. It can transmit data rates of up to 25Mbps and output 3.3V and 5V signals with a CMOS-compatible output. Compared to an optocoupler, the ISOM7810 has a high common mode transient immunity, low propagation delay, small pulse with distortion, low power consumption, and more. Opto 7 Click is equipped with two of these opto-emulators for receiving and transmitting

data. The external power supply can be connected to a VCC2 terminal and must be 3.3V or 5V. The three-pin terminal connects input and output data lines along with the common ground. Opto 7 Click can use general-purpose IO to communicate with the host MCU over the GP1 and GP2 pins. It can also be used for a standard UART communication isolation with commonly used UART RX and TX pins. The selection can be made over the OUT SEL and IN SEL jumpers. Both should be in a proper

position for the communication to work. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC 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.

Opto 7 Click hardware overview 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

PIC18F46K22

Architecture

PIC

MCU Memory (KB)

64

Silicon Vendor

Microchip

Pin count

40

RAM (Bytes)

3896

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
ID COMM
RE0
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
General-Purpose I/O
RC0
PWM
General-Purpose I/O
RB0
INT
UART TX
RC6
TX
UART RX
RC7
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Opto 7 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 via UART Mode

1. Once the code example is loaded, pressing the "FLASH" button initiates the build process, and programs it on the created setup.

2. After the programming is completed, click on the Tools icon in the upper-right panel, and select the UART Terminal.

3. After opening the UART Terminal tab, first check the baud rate setting in the Options menu (default is 115200). If this parameter is correct, activate the terminal by clicking the "CONNECT" button.

4. Now terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART_Application_Output

Software Support

Library Description

This library contains API for Opto 7 Click driver.

Key functions:

  • opto7_generic_write - Opto 7 data writing function.

  • opto7_set_gp1_pin - Opto 7 set GP1 pin function.

  • opto7_get_gp2_pin - Opto 7 get GP2 pin function.

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 Opto 7 Click Example.
 *
 * # Description
 * This example demonstrates the use of Opto 7 click board by processing
 * the incoming data and displaying them on the USB UART.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of UART LOG and GPIO pin, and UART drivers.
 *
 * ## Application Task
 * This example is made of two parts:
 * GPIO Example - The output pin is toggled every 5 seconds and input pin state is being tracked.
 * UART Example - Device assigned as transmitter is sending message and receiver is reading it and displaying it on USB UART.
 * 
 * ## Additional Function
 * - static void opto7_clear_app_buf ( void )
 * - static void opto7_log_app_buf ( void )
 * - static err_t opto7_process ( opto7_t *ctx )
 * 
 * @author Stefan Ilic
 *
 */

#include "board.h"
#include "log.h"
#include "opto7.h"

// Example selection macros
#define EXAMPLE_GPIO                1               // Example of using GPIO
#define EXAMPLE_UART                2               // Example of using UART
#define DEMO_EXAMPLE                EXAMPLE_GPIO    // Example selection macro

// Macros for UART example
#define TRANSMITTER                 // Comment out this line to place device into receiver mode
#define TX_MESSAGE                  "Opto 7 Click Example \r\n"

// Application buffer size
#define APP_BUFFER_SIZE             500
#define PROCESS_BUFFER_SIZE         200

static opto7_t opto7;
static log_t logger;


static uint8_t app_buf[ APP_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;

/**
 * @brief Test clearing application buffer.
 * @details This function clears memory of application buffer and reset its length.
 * @note None.
 */
static void opto7_clear_app_buf ( void );

/**
 * @brief Test log application buffer.
 * @details This function logs data from application buffer to USB UART.
 * @note None.
 */
static void opto7_log_app_buf ( void );

/**
 * @brief Test data reading function.
 * @details This function reads data from device and concatenates data to application buffer. 
 * @param[in] ctx : Click context object.
 * See #opto7_t object definition for detailed explanation.
 * @return @li @c  0 - Read some data.
 *         @li @c -1 - Nothing is read.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t opto7_process ( opto7_t *ctx );

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    opto7_cfg_t opto7_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.
    opto7_cfg_setup( &opto7_cfg );
    OPTO7_MAP_MIKROBUS( opto7_cfg, MIKROBUS_1 );
    
#if ( DEMO_EXAMPLE == EXAMPLE_GPIO )
    opto7_drv_interface_selection( &opto7_cfg, OPTO7_DRV_SEL_GPIO );
#else
    opto7_drv_interface_selection( &opto7_cfg, OPTO7_DRV_SEL_UART );
#endif
    
    if ( UART_ERROR == opto7_init( &opto7, &opto7_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
#if ( DEMO_EXAMPLE == EXAMPLE_GPIO )
    log_printf( &logger, " GP1 pin state HIGH \r\n" );
    opto7_set_gp1_pin( &opto7, OPTO7_PIN_STATE_HIGH );
     if ( OPTO7_PIN_STATE_HIGH == opto7_get_gp2_pin( &opto7 ) )
    {
        log_printf( &logger, " GP2 pin state HIGH \r\n" );
    }
    else
    {
        log_printf( &logger, " GP2 pin state LOW \r\n" );
    }
    log_printf( &logger, "- - - - - - - - - - - -\r\n" );
    Delay_ms( 5000 );
    
    log_printf( &logger, " GP1 pin state LOW \r\n" );
    opto7_set_gp1_pin( &opto7, OPTO7_PIN_STATE_LOW );
    if ( OPTO7_PIN_STATE_HIGH == opto7_get_gp2_pin( &opto7 ) )
    {
        log_printf( &logger, " GP2 pin state HIGH \r\n" );
    }
    else
    {
        log_printf( &logger, " GP2 pin state LOW \r\n" );
    }
    log_printf( &logger, "- - - - - - - - - - - -\r\n" );
    Delay_ms( 5000 );
#else
#if defined TRANSMITTER
    log_printf( &logger, " Message sent! \r\n" );
    opto7_generic_write( &opto7, TX_MESSAGE, strlen( TX_MESSAGE ) );
    Delay_ms( 2000 );
#else
    if ( OPTO7_OK == opto7_process( &opto7 ) ) 
    {
        opto7_log_app_buf( );
        opto7_clear_app_buf( );
    }
#endif

#endif
}

void main ( void ) 
{
    application_init( );

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

static void opto7_clear_app_buf ( void ) 
{
    memset( app_buf, 0, app_buf_len );
    app_buf_len = 0;
}

static void opto7_log_app_buf ( void )
{
    for ( int32_t buf_cnt = 0; buf_cnt < app_buf_len; buf_cnt++ )
    {
        log_printf( &logger, "%c", app_buf[ buf_cnt ] );
    }
}

static err_t opto7_process ( opto7_t *ctx ) 
{
    uint8_t rx_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
    int32_t overflow_bytes = 0;
    int32_t rx_cnt = 0;
    int32_t rx_size = opto7_generic_read( ctx, rx_buf, PROCESS_BUFFER_SIZE );
    if ( ( rx_size > 0 ) && ( rx_size <= APP_BUFFER_SIZE ) ) 
    {
        if ( ( app_buf_len + rx_size ) > APP_BUFFER_SIZE ) 
        {
            overflow_bytes = ( app_buf_len + rx_size ) - APP_BUFFER_SIZE;
            app_buf_len = APP_BUFFER_SIZE - rx_size;
            memmove ( app_buf, &app_buf[ overflow_bytes ], app_buf_len );
            memset ( &app_buf[ app_buf_len ], 0, overflow_bytes );
        }
        for ( rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ ) 
        {
            if ( rx_buf[ rx_cnt ] ) 
            {
                app_buf[ app_buf_len++ ] = rx_buf[ rx_cnt ];
            }
        }
        return OPTO7_OK;
    }
    return OPTO7_ERROR;
}

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

Additional Support

Resources

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