Expand 8 Click Board
Expand 8 Click Board
Key Features:
- 10-Port I/O expander, overvoltage protection, support hot-insertion, SPI, QSPI™, MICROWIRE™ compatible serial interface, low power consumption, and more.
- Based on the MAX7317 - 10-Port SPI-interfaced I/O expander with overvoltage and hot-insertion protection from Maxim Integrated
- Intended for use as a port expander in system monitoring applications, industrial controllers, portable equipment, and many more
- mikroBUS: SPI Interface
The Expand 8 Click Board™ is a compact add-on board that contains a multi-port I/O expander with bi-directional input/outputs. This board features the MAX7317, 10-Port SPI-interfaced I/O expander with overvoltage and hot-insertion protection from Maxim Integrated. The MAX7317 provides microprocessors with 10 I/O ports rated to 7V. Each port can be individually configured as either an open-drain output or an overvoltage-protected Schmitt input that supports hot insertion. All port pins remain high impedance in Power-Down mode with up to 8V asserted on them. This Click Board™ is intended for use as a port expander in system monitoring applications, industrial controllers, portable equipment, and many more.
Expand 8 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click Board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
Software Support
We provide a library for the Expand 8 Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
The library covers all the necessary functions to control Expand 8 click board. The library performs a standard SPI interface communication.
Key Functions
void expand8_write_data ( uint8_t addr, uint8_t tx_data )
- Generic write data function.uint8_t expand8_read_data ( uint8_t addr )
- Generic read data function.EXPAND8_RETVAL_T expand8_set_port ( uint8_t sel_port, uint8_t sel_imped )
- Set port function.
Example Description
The application is composed of three sections :
- System Initialization - Initializes SPI, set the CS pin as outputs and begins to write log.
- Application Initialization - Initialization driver enables - SPI, also write log.
- Application Task - (code snippet) This is an example that demonstrates the use of the Expand 8 click board. Expand 8 clicks by toggling each of 10 available ports every 1 second. Results are being sent to the Usart Terminal where you can track their changes.
void application_task ( ) { expand8_set_port( select_port, EXPAND8_SET_LOW_IMPEDANCE ); mikrobus_logWrite( " Port P", _LOG_TEXT ); ByteToStr( select_port, demo_text ); Ltrim( demo_text ); mikrobus_logWrite( demo_text, _LOG_TEXT ); mikrobus_logWrite( " ON", _LOG_LINE ); mikrobus_logWrite( "- - - - - - - - - - -", _LOG_LINE ); Delay_ms( 1000 ); expand8_set_port( select_port, EXPAND8_SET_HIGH_IMPEDANCE ); mikrobus_logWrite( " Port P", _LOG_TEXT ); ByteToStr( select_port, demo_text ); Ltrim( demo_text ); mikrobus_logWrite( demo_text, _LOG_TEXT ); mikrobus_logWrite( " OFF", _LOG_LINE ); mikrobus_logWrite( "---------------------", _LOG_LINE ); Delay_ms( 1000 ); select_port++; if ( select_port > EXPAND8_ADDR_OUT_LVL_PORT_P9 ) { select_port = EXPAND8_ADDR_OUT_LVL_PORT_P0; } }
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- SPI
- UART
- Conversions
Additional Notes and Information
Depending on the development board you are using, you may need a 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.
MIKROSDK
This Click board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Expand 8 Click Board
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