Preserve user settings and preferences with DS28EC20 and STM32F091RC
Future-proofing solutions with EEPROM innovation
Published Feb 26, 2024
Click board™
EEPROM 6 Click
Dev Board
Nucleo-64 with STM32F091RC MCU
Compiler
NECTO Studio
MCU
STM32F091RC
Through the strategic use of EEPROM memory, our solution addresses the challenges of data persistence and management, enabling you to focus on innovation and growth
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Hardware Overview
How does it work?
EEPROM 6 Click is based on the DS28EC20, a 20Kb data EEPROM with a fully featured 1-Wire interface in a single chip from Analog Devices. The memory is organized as 80 pages of 256 bits each. In addition, the device has one page for control functions such as permanent write protection and EPROM-Emulation mode for individual 2048-bit (8-page) memory blocks. A volatile 256-bit memory page called the scratchpad acts as a buffer when writing data to the EEPROM to ensure data integrity. Data is first written to the scratchpad, from which it can be read back for verification before transferring it to the EEPROM. Each DS28EC20 has its own unalterable and unique 64-bit registration number.
The registration number guarantees unique identification and addresses the device in a multidrop 1-Wire net environment. In addition to the EEPROM, the device has a 32-byte volatile scratchpad. Writes to the EEPROM array are a two-step process. First, data is written to the scratchpad and then copied into the main array. The user can verify the data in the scratchpad before copying. The EEPROM 6 Click communicates with MCU using the 1-Wire interface, which supports a Standard and Overdrive communication speed of 15.4kbps (max) and 90kbps (max). If not explicitly set into the Overdrive mode, the DS28EC20 communicates at Standard speed. The 1-Wire communication line is
routed to the SMD jumper labeled GP SEL, which allows routing of the 1-Wire communication either to the PWM pin or the AN pin of the mikroBUS™ socket. These pins are labeled GP0 and GP1, respectively, the same as the SMD jumper positions, making the selection of the desired pin simple and straightforward. 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-64 with STM32F091RC MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
256
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
32768
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo-64 with STM32F091RC MCU as your development board.
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for EEPROM 6 Click driver.
Key functions:
eprom6_write_mem- This function writes a sequential data starting of the targeted 16b register address of the targeted 16-bit register address of the DS28EC20eeprom6_read_mem- This function reads a sequential data starting from the targeted 16-bit register address of the DS28EC20.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file main.c
* @brief EEPROM 6 Click Example.
*
* # Description
* This example demonstrates the use of EEPROM6 click board by writing
* string to a memory at some specific location and then reading it back.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* This example shows capabilities of EEPROM 6 Click board by writting a string
* into memory location from a specific address, and then reading it back every 5 seconds.
*
* @author Nikola Citakovic
*
*/
#include "board.h"
#include "log.h"
#include "eeprom6.h"
static eeprom6_t eeprom6;
static log_t logger;
#define EEPROM6_DEMO_TEXT "MikroE - EEPROM 6 click board"
#define EEPROM6_TEXT_ADDRESS 0x0000
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
eeprom6_cfg_t eeprom6_cfg; /**< Click config object. */
/**
* 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.
eeprom6_cfg_setup( &eeprom6_cfg );
EEPROM6_MAP_MIKROBUS( eeprom6_cfg, MIKROBUS_1 );
if ( ONE_WIRE_ERROR == eeprom6_init( &eeprom6, &eeprom6_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( EEPROM6_ERROR == eeprom6_default_cfg ( &eeprom6 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
log_printf( &logger, "Writing \"%s\" to memory address 0x%.4X\r\n",
( uint8_t * ) EEPROM6_DEMO_TEXT, EEPROM6_TEXT_ADDRESS );
eeprom6_write_mem( &eeprom6, EEPROM6_TEXT_ADDRESS, ( char * ) EEPROM6_DEMO_TEXT,
strlen ( EEPROM6_DEMO_TEXT ) );
Delay_ms( 100 );
uint8_t read_buf[ 100 ] = { 0 };
eeprom6_read_mem ( &eeprom6, EEPROM6_TEXT_ADDRESS,read_buf,
strlen ( EEPROM6_DEMO_TEXT ) );
log_printf( &logger, "Reading \"%s\" from memory address 0x%.4X\r\n\n",
read_buf, ( uint16_t ) EEPROM6_TEXT_ADDRESS );
Delay_ms( 5000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
