expand12  2.0.0.0
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Expand 12 click

Expand 12 Click is a compact add-on board that contains a multi-port I/O expander. This board features the MAX7300, a general-purpose I/O expander providing remote I/O expansion for most MCU’s families from Maxim Integrated, now part of Analog Devices. The MAX7300 comes in a 28-port configuration and allows easy addition of I/O through a standard I2C serial interface. Each port is user-configurable to either a logic input or logic output, capable of sinking 10mA and sourcing 4.5mA.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Sep 2021.
  • Type : I2C type

Software Support

We provide a library for the Expand12 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Expand12 Click driver.

Standard key functions :

Example key functions :

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.

void application_init ( void )
{
log_cfg_t log_cfg;
expand12_cfg_t expand12_cfg;
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 " );
}

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.

void application_task ( void )
{
static uint8_t port_value = 0;
static uint32_t pins_status = 0;
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 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Expand12

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.


EXPAND12_PORT_8_15
#define EXPAND12_PORT_8_15
Definition: expand12.h:182
expand12_cfg_setup
void expand12_cfg_setup(expand12_cfg_t *cfg)
Expand 12 configuration object setup function.
expand12_set_pin_value
err_t expand12_set_pin_value(expand12_t *ctx, uint8_t pin, uint8_t pin_value)
Expand 12 set pin value function.
expand12_init
err_t expand12_init(expand12_t *ctx, expand12_cfg_t *cfg)
Expand 12 initialization function.
expand12_t
Expand 12 Click context object.
Definition: expand12.h:246
application_task
void application_task(void)
Definition: main.c:65
EXPAND12_PORT_4_7
#define EXPAND12_PORT_4_7
Definition: expand12.h:181
EXPAND12_PORT_16_23
#define EXPAND12_PORT_16_23
Definition: expand12.h:183
expand12_set_pin_direction
err_t expand12_set_pin_direction(expand12_t *ctx, uint8_t pin, uint8_t direction)
Expand 12 set pin direction function.
expand12_set_port_value
err_t expand12_set_port_value(expand12_t *ctx, uint8_t port, uint8_t clr_mask, uint8_t set_mask)
Expand 12 set port value function.
expand12_read_all_pins_value
err_t expand12_read_all_pins_value(expand12_t *ctx, uint32_t *pins_value)
Expand 12 read all pins value function.
EXPAND12_MAP_MIKROBUS
#define EXPAND12_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: expand12.h:234
application_init
void application_init(void)
Definition: main.c:29
expand12_cfg_t
Expand 12 Click configuration object.
Definition: expand12.h:260
EXPAND12_ERROR
@ EXPAND12_ERROR
Definition: expand12.h:276
EXPAND12_ALL_PINS
#define EXPAND12_ALL_PINS
Definition: expand12.h:179
expand12_default_cfg
err_t expand12_default_cfg(expand12_t *ctx)
Expand 12 default configuration function.