Create a versatile solution for connecting and controlling various peripherals with MAX7300 and TM4C129ENCPDT

Expand and conquer: I/O magic for your projects!

Published Oct 07, 2023

Click board™

Expand 12 Click

Dev. board

Fusion for Tiva v8

Compiler

NECTO Studio

MCU

TM4C129ENCPDT

Empower industrial automation systems and embedded solutions with our I/O expander, providing a compact and versatile solution for expanding input and output capabilities

Hardware Overview

How does it work?

Expand 12 Click is based on the MAX7300, a general-purpose input/output (GPIO) expander from Analog Devices, now part of Analog Devices. This port expander is a simple solution when additional I/Os are needed while keeping interconnections to a minimum. It is particularly great for system monitoring applications, industrial controllers, and portable equipment. The MAX7300 comes in a 28-port configuration, which can be configured to any combination of logic inputs and logic outputs and default to logic inputs on Power-Up. Any I/O port can be configured as a push-pull output (sinking 10mA,

sourcing 4.5mA) or a Schmitt-trigger logic input. Each input has an individually selectable internal pull-up resistor. Additionally, transition detection allows seven ports (from port 24 up to port 30) to be monitored in any maskable combination for changes in their logic status. A detected transition is flagged through a status register bit and an interrupt pin (port 31) if desired. Expand 12 Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings with a maximum frequency of 400kHz. Besides, it also allows the choice of the least significant bit of its I2C slave address by

positioning the SMD jumpers labeled ADDR SEL to an appropriate position marked as 1 and 0. This way, the MAX7300 provides the opportunity of the 16 possible different I2C addresses by positioning the SMD jumper to an appropriate position. 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.

Features overview

Development board

Fusion for TIVA v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different 32-bit ARM® Cortex®-M based MCUs from Texas Instruments, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over a WiFi network. 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, Fusion for TIVA v8 provides a fluid and immersive working experience, allowing access

anywhere and under any circumstances at any time. Each part of the Fusion for TIVA v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it 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 HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. Fusion for TIVA 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

Type

8th Generation

Architecture

ARM Cortex-M4

MCU Memory (KB)

1024

Silicon Vendor

Texas Instruments

Pin count

128

RAM (Bytes)

262144

Used MCU Pins

mikroBUS™ mapper

RST

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM

INT

I2C Clock

PD2

SCL

I2C Data

PD3

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Fusion for Tiva 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

SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly

GNSS2 Click complete accessories setup image hardware assembly

Board mapper by product7 hardware assembly

NECTO Compiler Selection Step Image 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 Expand 12 Click driver.

Key functions:

expand12_set_pin_direction - This function sets the direction of the selected pin
expand12_set_pin_value - This function sets the logic level of the selected pin
expand12_read_all_pins_value - This function reads all pins logic levels

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 Expand12 Click example
 *
 * # Description
 * This example demonstrates the use of Expand 12 Click board.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and performs the Click default configuration which sets 
 * the first three ports (pins 4-23) as output and the fourth port (pins 24-31) as input with pull-ups.
 *
 * ## Application Task
 * Sets the pins of the first three ports and then reads the status of all pins and 
 * displays the result on the USB UART approximately every 100 miliseconds.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "expand12.h"

static expand12_t expand12;
static log_t logger;

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    expand12_cfg_t expand12_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.
    expand12_cfg_setup( &expand12_cfg );
    EXPAND12_MAP_MIKROBUS( expand12_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == expand12_init( &expand12, &expand12_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( EXPAND12_ERROR == expand12_default_cfg ( &expand12 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
    static uint8_t port_value = 0;
    static uint32_t pins_status = 0;
    
    expand12_set_port_value( &expand12, EXPAND12_PORT_4_7, EXPAND12_ALL_PINS, port_value );
    expand12_set_port_value( &expand12, EXPAND12_PORT_8_15, EXPAND12_ALL_PINS, port_value );
    expand12_set_port_value( &expand12, EXPAND12_PORT_16_23, EXPAND12_ALL_PINS, port_value++ );
        
    expand12_read_all_pins_value( &expand12, &pins_status );
    log_printf( &logger, " Pins status (32-bit) : 0x%.8LX\r\n\n", pins_status );
    Delay_ms ( 100 );
}

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