expand  2.0.0.0
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Expand click

< Expand click is an accessory board in mikroBUS form factor. It includes a 16-bit I/O expander MCP23S17 with SPI clock speeds up to 10 MHz for higher throughput applications >

click Product page


Click library

  • Author : MikroE Team
  • Date : Feb 2020.
  • Type : SPI type

Software Support

We provide a library for the Expand 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Expand Click driver.

Standard key functions :

  • Config Object Initialization function.

    void expand_cfg_setup ( expand_cfg_t *cfg );

  • Initialization function.

    EXPAND_RETVAL expand_init ( expand_t *ctx, expand_cfg_t *cfg );

Example key functions :

  • Set expander PORTA direction function.

    void expand_set_direction_port_a ( expand_t *ctx, uint8_t mod_cmd, uint8_t write_data );

  • Write one byte of data to register for PORTA function.

    void expand_write_port_a ( expand_t *ctx, uint8_t mod_cmd, uint8_t write_data );

  • Reset function.

    void expand_reset ( expand_t *ctx );

Examples Description

This applicatioin use for expansion I/O lines.

The demo application is composed of two sections :

Application Init

Initialization driver enable's - GPIO, reset MCP23S17 chip, set PORTA to be output and PORTB to be input, set default configuration and start write log.

void application_init ( void )
{
log_cfg_t log_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
EXPAND_MAP_MIKROBUS( cfg, MIKROBUS_1 );
expand_init( &expand, &cfg );
}

Application Task

This is a example which demonstrates the use of Expand Click board. Expand Click communicates with register via SPI protocol by write and read from register, set configuration and state and read configuration and state. Results are being sent to the Usart Terminal where you can track their changes. All data logs on usb uart for aproximetly every 500 ms.

void application_task ( void )
{
pin_position = 1;
for ( position = 0; position < 8; position++ )
{
log_printf( &logger, " PA%d set\r\n", (uint16_t) position );
log_printf( &logger, " Status PB (input) : %d \r\n", (uint16_t) port_status );
log_printf( &logger, "----------------\r\n" );
pin_position <<= 1;
Delay_ms( 500 );
}
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Expand

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.


EXPAND_SPI_MODULE_POSITION_0
#define EXPAND_SPI_MODULE_POSITION_0
Definition: expand.h:86
expand_cfg_setup
void expand_cfg_setup(expand_cfg_t *cfg)
Config Object Initialization function.
expand_write_port_a
void expand_write_port_a(expand_t *ctx, uint8_t mod_cmd, uint8_t write_data)
Write one byte of data to register for PORTA function.
EXPAND_PORT_DIRECTION_OUTPUT
#define EXPAND_PORT_DIRECTION_OUTPUT
Definition: expand.h:100
EXPAND_PORT_DIRECTION_INPUT
#define EXPAND_PORT_DIRECTION_INPUT
Definition: expand.h:101
expand_set_pull_ups_port_b
void expand_set_pull_ups_port_b(expand_t *ctx, uint8_t mod_cmd, uint8_t write_data)
Set pull-ups of the expander for PORTB pins function.
expand_read_port_b
uint8_t expand_read_port_b(expand_t *ctx, uint8_t mod_cmd)
Read one byte of data from PORTB function.
application_task
void application_task(void)
Definition: main.c:73
expand_init
EXPAND_RETVAL expand_init(expand_t *ctx, expand_cfg_t *cfg)
Initialization function.
expand_default_configuration
void expand_default_configuration(expand_t *ctx, uint8_t mod_cmd)
Generic write one bayt to register function.
expand_set_direction_port_a
void expand_set_direction_port_a(expand_t *ctx, uint8_t mod_cmd, uint8_t write_data)
Set expander PORTA direction function.
expand_cfg_t
Click configuration structure definition.
Definition: expand.h:222
EXPAND_MAP_MIKROBUS
#define EXPAND_MAP_MIKROBUS(cfg, mikrobus)
Definition: expand.h:54
application_init
void application_init(void)
Definition: main.c:40
expand_set_direction_port_b
void expand_set_direction_port_b(expand_t *ctx, uint8_t mod_cmd, uint8_t write_data)
Set expander PORTB direction function.