Beginner
10 min

Enhance industrial device communication with the DS2485 and PIC18F57Q43

An advanced 1-Wire master with EEPROM memory

I2C 1-Wire 2 Click with Curiosity Nano with PIC18F57Q43

Published May 16, 2024

Click board™

I2C 1-Wire 2 Click

Dev. board

Curiosity Nano with PIC18F57Q43

Compiler

NECTO Studio

MCU

PIC18F57Q43

Simplify communication by allowing I2C devices to talk to 1-Wire devices easily, especially in industrial settings.

A

A

Hardware Overview

How does it work?

I2C 1-Wire 2 Click is based on the DS2485, an advanced 1-Wire master with memory from Analog Devices. The core function of the DS2485 involves facilitating the protocol transition between the I2C master interface and any connected 1-Wire slave devices. It is equipped with internal, adjustable timers that manage the 1-Wire signaling, thereby offloading the host processor of the duty to produce timing-sensitive 1-Wire signals. This feature allows for both regular and accelerated 1-Wire communication rates. An internal weak pull-up can pull the 1-Wire line up, an external resistor by populating R6 with a chosen resistance value, or combining internal and external pull-up methods for enhanced flexibility. This Click board™ is predominantly utilized in industrial sensor and tool

applications, temporary consumables, and for identifying printer cartridges. Upon receiving commands and data, the DS2485's input/output management unit takes over the execution of crucial 1-Wire operations such as the reset/presence-detection cycle, byte reading and writing, block reading and writing, single-bit read/write operations, executing triplets for ROM search activities, and handling complete command sequences for 1-Wire authenticators—all without the need for continuous host processor intervention. Featuring a 0.75Kb EEPROM array, the DS2485 offers general-purpose, reprogrammable memory distributed across three 32-byte pages at even-numbered addresses, while odd-numbered pages are locked and inaccessible.

Each of these even-numbered pages comes with optional security settings. For communication with the host processor, the DS2485 uses an I2C interface, supporting both standard and fast modes, with communication speeds up to 1MHz. Additionally, the device's general-purpose I/O pin, available on the GPO terminal, can be managed independently via specific commands. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

I2C 1-Wire 2 Click hardware overview image

Features overview

Development board

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.

PIC18F57Q43 Curiosity Nano double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

48

RAM (Bytes)

8196

You complete me!

Accessories

Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.

Curiosity Nano Base for Click boards accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
ID COMM
PD4
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB2
SCL
I2C Data
PB1
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

I2C 1-Wire 2 Click Schematic schematic

Step by step

Project assembly

Curiosity Nano Base for Click boards front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F57Q43 as your development board.

Curiosity Nano Base for Click boards front image hardware assembly
Charger 27 Click front image hardware assembly
PIC18F47Q10 Curiosity Nano front image hardware assembly
Prog-cut hardware assembly
Charger 27 Click complete accessories setup image hardware assembly
Board mapper by product8 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
PIC18F57Q43 Curiosity MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

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 I2C 1-Wire 2 Click driver.

Key functions:

  • i2c1wire2_master_reset - This function is used to reset device, and return all configuration registers to the default values.

  • i2c1wire2_write_port_cfg - This function is used to write a 1-Wire configuration register.

  • i2c1wire2_search - This function is used to perform 1-Wire Search algorithm and return one device ROMID.

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 I2C 1-Wire 2 Click example
 *
 * # Description
 * This example demonstrates the use of the I2C 1-Wire 2 Click board
 * by searching if a device is connected and reading its ROMID.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of I2C module, log UART and perform Click default configuration.
 *
 * ## Application Task
 * Performing 1-Wire Search algorithm to find if any device is connected.
 * If a device is connected and detected, its ROMID will be read and displayed.
 *
 * @author Stefan Ilic
 *
 */

#include "board.h"
#include "log.h"
#include "i2c1wire2.h"

static i2c1wire2_t i2c1wire2;
static log_t logger;

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2c1wire2_cfg_t i2c1wire2_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.
    i2c1wire2_cfg_setup( &i2c1wire2_cfg );
    I2C1WIRE2_MAP_MIKROBUS( i2c1wire2_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == i2c1wire2_init( &i2c1wire2, &i2c1wire2_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( I2C1WIRE2_ERROR == i2c1wire2_default_cfg ( &i2c1wire2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
    err_t error_flag;
    uint8_t flag;
    uint8_t last_flag;
    uint8_t rom_id[ 8 ] = { 0 };
    #define I2C1WIRE2_DEVICE_SEARCH_CODE            0xF0

    error_flag = i2c1wire2_search ( &i2c1wire2, &flag, rom_id, &last_flag, I2C1WIRE2_SEARCH_RESET | 
                                    I2C1WIRE2_SEARCH_1WIRE_RESET, I2C1WIRE2_DEVICE_SEARCH_CODE );
    if ( I2C1WIRE2_OK == error_flag )
    {   
        if ( I2C1WIRE2_RESULT_BYTE_OK == flag )
        {
            log_printf( &logger, " Device found: \r\n" );
            log_printf( &logger, " Device ROMID: 0x" );
            for ( uint8_t n_cnt = 0; n_cnt < 8; n_cnt++ )
            {
                log_printf( &logger, "%.2X", ( uint16_t ) rom_id[ n_cnt ] );
            }
            log_printf( &logger, " \r\n" );
            log_printf( &logger, " Last device flag %d \r\n", last_flag );
        }
        else if ( I2C1WIRE2_NO_DEVICE_DETECTED == flag )
        {
            log_printf( &logger, " No device detected \r\n" );
        }
        else if ( I2C1WIRE2_NO_PRESENCE_PULS == flag )
        {
            log_printf( &logger, " No presence puls \r\n" );
        }
    }
    else 
    {
        log_printf( &logger, " ERROR \r\n" );
    }
    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

Additional Support

Resources

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