Simplify complex I/O challenges with CY8C9520A and STM32F031K6
Unlocking connectivity
Published Oct 01, 2024
Click board™
EXPAND 6 Click
Dev. board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
Navigate the challenges of limited I/O resources with confidence, as our port expander technology offers real-time pin expansion, precision control, and adaptability for diverse electronic systems
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Hardware Overview
How does it work?
EXPAND 6 Click is based on the CY8C9520A, 20-bit I/O expander with EEPROM, and four independently configurable 8-bit PWM outputs from Infineon. The main blocks of the CY8C9520A include the control unit, PWMs, EEPROM, and I/O ports. The I/O expander's data pins can be independently assigned as inputs, outputs, or PWM outputs and can be configured as open-drain or collector, strong drive (10 mA source, 25 mA sink), resistively pulled up or down, or high impedance which can be selected in the Port Drive Mode register. It operates as two I2C peripheral devices, where the first device is a multi-port I/O expander (single I2C address to access all ports through registers), and the second is a serial EEPROM with 3 Kbyte address space. Configuration and output register settings are storable as the user defaults in a dedicated section
of the EEPROM. If user defaults were stored in EEPROM, they are restored to the ports at the Power-Up sequence. The EEPROM is byte-readable and supports byte-by-byte writing. A pin 3 of Port 2 on this Click board™ can be configured as an EEPROM Write Disable (WD) input that blocks write operations when set high. The configuration registers can also turn off EEPROM operations. EXPAND 6 Click communicates with MCU using the standard I2C 2-Wire interface with a maximum frequency of 100kHz. The CY8C9520A has, by default, two possible I2C slave address formats: the first is used to access the multi-port device, and the second to access the EEPROM. This selection of I2C slave addresses is performed by setting the logic level on the A0 pin of the CY8C9520A, which can be done using the SMD jumper labeled ADDR SEL. It also generates a
programmable interrupt signal routed on the INT pin of the mikroBUS™, which can inform the system master that there is incoming data on its ports or that the PWM output state has changed. The reset signal routed on the RST pin of the mikroBUS™ socket is similar to the POR (Power-ON Reset) function. When the CY8C9520A is held in Reset, all In and Out pins are held at their default High-Z State. 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
Nucleo 32 with STM32F031K6 MCU board provides an affordable and flexible platform for experimenting with STM32 microcontrollers in 32-pin packages. Featuring Arduino™ Nano connectivity, it allows easy expansion with specialized shields, while being mbed-enabled for seamless integration with online resources. The
board includes an on-board ST-LINK/V2-1 debugger/programmer, supporting USB reenumeration with three interfaces: Virtual Com port, mass storage, and debug port. It offers a flexible power supply through either USB VBUS or an external source. Additionally, it includes three LEDs (LD1 for USB communication, LD2 for power,
and LD3 as a user LED) and a reset push button. The STM32 Nucleo-32 board is supported by various Integrated Development Environments (IDEs) such as IAR™, Keil®, and GCC-based IDEs like AC6 SW4STM32, making it a versatile tool for developers.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
32
Silicon Vendor
STMicroelectronics
Pin count
32
RAM (Bytes)
4096
You complete me!
Accessories
Click Shield for Nucleo-32 is the perfect way to expand your development board's functionalities with STM32 Nucleo-32 pinout. The Click Shield for Nucleo-32 provides two mikroBUS™ sockets to add any functionality from our ever-growing range of Click boards™. We are fully stocked with everything, from sensors and WiFi transceivers to motor control and audio amplifiers. The Click Shield for Nucleo-32 is compatible with the STM32 Nucleo-32 board, providing an affordable and flexible way for users to try out new ideas and quickly create prototypes with any STM32 microcontrollers, choosing from the various combinations of performance, power consumption, and features. The STM32 Nucleo-32 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/programmer and come with the STM32 comprehensive software HAL library and various packaged software examples. This development platform provides users with an effortless and common way to combine the STM32 Nucleo-32 footprint compatible board with their favorite Click boards™ in their upcoming projects.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 32 with STM32F031K6 MCU as your development board.
Software Support
Library Description
This library contains API for EXPAND 6 Click driver.
Key functions:
expand6_write_port- Set all OUTPUT pins' logic levels in one port functionexpand6_reset- Reset functionexpand6_write_pin- Set a single OUTPUT pin's logic level function
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
* \brief Expand6 Click example
*
* # Description
* This example demonstrates the use of EXPAND 6 Click board.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initalizes I2C driver and makes an initial log.
*
* ## Application Task
* This example shows the capabilities of the EXPAND 6 Click by toggling
* each of the 20 available pins.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "expand6.h"
// ------------------------------------------------------------------ VARIABLES
static expand6_t expand6;
static log_t logger;
uint8_t pin_num;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
expand6_cfg_t cfg;
/**
* 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.
expand6_cfg_setup( &cfg );
EXPAND6_MAP_MIKROBUS( cfg, MIKROBUS_1 );
expand6_init( &expand6, &cfg );
expand6_reset ( &expand6 );
Delay_ms ( 1000 );
log_printf( &logger, "------------------- \r\n" );
log_printf( &logger, " EXPAND 6 Click \r\n" );
log_printf( &logger, "------------------- \r\n" );
}
void application_task ( void )
{
expand6_write_port( &expand6, EXPAND6_PORT_0, 0xFF );
expand6_write_port( &expand6, EXPAND6_PORT_1, 0xFF );
expand6_write_port( &expand6, EXPAND6_PORT_2, 0xFF );
log_printf( &logger, "All pins set to HIGH logic level!\r\n" );
log_printf( &logger, "---------------------------------\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
for ( pin_num = 0; pin_num < 20; pin_num++ )
{
expand6_write_pin( &expand6, pin_num, EXPAND6_LOW );
log_printf( &logger, "Pin %u is set to LOW logic level!\r\n", ( uint16_t) pin_num );
Delay_ms ( 300 );
}
log_printf( &logger, "---------------------------------\r\n" );
Delay_ms ( 1000 );
}
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
Additional Support
Resources
Category:Port expander
