expand14  2.0.0.0
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Expand 14 Click

Expand 14 Click is a compact add-on board that contains a multi-port I/O expander. This board features the CAT9555, a CMOS device that provides 16-bit parallel input/output port expansion from ON Semiconductor. The CAT9555 contains two 8-bit configuration ports (input or output), input, output, and polarity inversion registers, alongside an I2C-compatible serial interface. Any of the sixteen I/Os can be configured as an input or output by writing to the configuration register. It also features an active-low interrupt output, indicating to the host controller that an input state has been changed.

Click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jun 2022.
  • Type : I2C type

Software Support

We provide a library for the Expand 14 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 Expand 14 Click driver.

Standard key functions :

Example key functions :

Example Description

This example demonstrates the use of Expand 14 Click board by setting and reading the ports state.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration which sets the port 0 as output and the port 1 as input.

void application_init ( void )
{
log_cfg_t log_cfg;
expand14_cfg_t expand14_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
expand14_cfg_setup( &expand14_cfg );
EXPAND14_MAP_MIKROBUS( expand14_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == expand14_init( &expand14, &expand14_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( EXPAND14_ERROR == expand14_default_cfg ( &expand14 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

Sets the pins of the port 0 and then reads the status of both ports and displays the results on the USB UART approximately once per second.

void application_task ( void )
{
uint8_t port_value = 0;
for ( uint16_t pin_num = EXPAND14_PIN_0_MASK; pin_num <= EXPAND14_PIN_7_MASK; pin_num <<= 1 )
{
expand14_set_all_pins_value( &expand14, pin_num );
expand14_read_port_value( &expand14, EXPAND14_PORT_0, &port_value );
log_printf( &logger, " Status port 0 (output): 0x%.2X\r\n", ( uint16_t ) port_value );
expand14_read_port_value( &expand14, EXPAND14_PORT_1, &port_value );
log_printf( &logger, " Status port 1 (input) : 0x%.2X\r\n\n", ( uint16_t ) port_value );
Delay_ms ( 1000 );
}
}

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.Expand14

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.


EXPAND14_PORT_0
#define EXPAND14_PORT_0
Expand 14 port values.
Definition: expand14.h:113
expand14_t
Expand 14 Click context object.
Definition: expand14.h:173
expand14_set_all_pins_value
err_t expand14_set_all_pins_value(expand14_t *ctx, uint8_t set_mask)
Expand 14 set all pins value function.
expand14_cfg_setup
void expand14_cfg_setup(expand14_cfg_t *cfg)
Expand 14 configuration object setup function.
application_task
void application_task(void)
Definition: main.c:66
expand14_init
err_t expand14_init(expand14_t *ctx, expand14_cfg_t *cfg)
Expand 14 initialization function.
EXPAND14_PORT_1
#define EXPAND14_PORT_1
Definition: expand14.h:114
EXPAND14_ERROR
@ EXPAND14_ERROR
Definition: expand14.h:208
EXPAND14_PIN_0_MASK
#define EXPAND14_PIN_0_MASK
Definition: expand14.h:99
expand14_read_port_value
err_t expand14_read_port_value(expand14_t *ctx, uint8_t port, uint8_t *data_out)
Expand 14 read port value function.
application_init
void application_init(void)
Definition: main.c:30
EXPAND14_PIN_7_MASK
#define EXPAND14_PIN_7_MASK
Definition: expand14.h:106
EXPAND14_MAP_MIKROBUS
#define EXPAND14_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: expand14.h:160
expand14_cfg_t
Expand 14 Click configuration object.
Definition: expand14.h:190
expand14_set_pin_direction
err_t expand14_set_pin_direction(expand14_t *ctx, uint8_t direction, uint8_t port, uint8_t pin_mask)
Expand 14 set pin direction function.
expand14_default_cfg
err_t expand14_default_cfg(expand14_t *ctx)
Expand 14 default configuration function.