Develop reliable and durable nonvolatile memory solution with FT24C08A and STM32F732IE
Retain stored data even when the power is turned off
Published Jun 18, 2023
Click board™
EEPROM Click
Dev Board
Fusion for ARM v8
Compiler
NECTO Studio
MCU
STM32F732IE
Dependable and long-lasting way to store information in electronic devices with enhanced write protection
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Hardware Overview
How does it work?
EEPROM Click is based on the FT24C08A, 8Kb EEPROM with an I2C interface and Write Protection Mode from Fremont Micro Devices. The FT24C08A is organized as 1024 words of 8 bits (1 byte) each. The FT24C08A has 64 pages, respectively. Since each page has 16 bytes, random word addressing to FT24C08A will require 10 bits of data word addresses, respectively. It benefits from a wide power supply range and 100 years of data retention combining high reliability and lasting one million full-memory read/write/erase cycles. This Click board™ communicates with
MCU using the standard I2C 2-Wire interface with clock frequency that supports a Fast-Plus (1MHz) mode of operation. The FT24C08A also has a 7-bit slave address with the first five MSBs fixed to 1010. The address pins A0, A1, and A2 are programmed by the user and determine the value of the last three LSBs of the slave address, which can be selected by positioning onboard SMD jumpers labeled as ADDR SEL to an appropriate position marked as 0 or 1. Also, the configurable Write Protection function, labeled WP routed to the PWM pin of the mikroBUS™ socket, allows the
user to protect the whole EEPROM array from programming, thus protecting it from Write instructions. 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. However, the 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
Fusion for ARM v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different ARM® Cortex®-M based MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, Fusion for ARM v8 provides a fluid and immersive working experience, allowing access anywhere and under any
circumstances at any time. Each part of the Fusion for ARM v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.
Communication options such as USB-UART, USB HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. Fusion for ARM v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Type
8th Generation
Architecture
ARM Cortex-M7
MCU Memory (KB)
512
Silicon Vendor
STMicroelectronics
Pin count
176
RAM (Bytes)
262144
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 Fusion for ARM v8 as your development board.
Track your results in real time
Application Output
After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.
Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.
In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".
The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.
Software Support
Library Description
This library contains API for EEPROM Click driver.
Key functions:
eeprom_write_page- Page Write functioneeprom_read_sequential- Sequential Read functioneeprom_write_protect- Write Protect function
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 Click example
*
* # Description
* This is a example which demonstrates the use of EEPROM Click board.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes peripherals and pins used by EEPROM Click.
* Initializes SPI serial interface and puts a device to the initial state.
*
* ## Application Task
* First page of memory block 1 will be written with data values starting from
* 1 to 16. This memory page will be read by the user, to verify successfully
* data writing. Data writing to memory will be protected upon memory writing,
* and before memory reading.
*
* \author Nemanja Medakovic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include <string.h>
#include "board.h"
#include "log.h"
#include "eeprom.h"
// ------------------------------------------------------------------ VARIABLES
static eeprom_t eeprom;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init( void )
{
eeprom_cfg_t eeprom_cfg;
log_cfg_t log_cfg;
// Click initialization.
eeprom_cfg_setup( &eeprom_cfg );
EEPROM_MAP_MIKROBUS( eeprom_cfg, MIKROBUS_1 );
eeprom_init( &eeprom, &eeprom_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 ----" );
}
void application_task( void )
{
uint8_t transfer_data[ EEPROM_NBYTES_PAGE ];
uint8_t read_buff[ EEPROM_NBYTES_PAGE ] = { 0 };
uint8_t cnt;
uint8_t tmp = EEPROM_BLOCK_ADDR_START;
transfer_data[ EEPROM_BLOCK_ADDR_START ] = 1;
for (cnt = EEPROM_BLOCK_ADDR_START + 1; cnt < EEPROM_NBYTES_PAGE; cnt++)
{
transfer_data[ cnt ] = transfer_data[ cnt - 1 ] + 1;
}
eeprom_write_enable( &eeprom );
eeprom_write_page( &eeprom, tmp, transfer_data );
eeprom_write_protect( &eeprom );
Delay_ms( 1000 );
memset( transfer_data, 0, sizeof(transfer_data) );
eeprom_read_sequential( &eeprom, EEPROM_BLOCK_ADDR_START, EEPROM_NBYTES_PAGE, read_buff );
for (cnt = EEPROM_BLOCK_ADDR_START; cnt < EEPROM_NBYTES_PAGE; cnt++)
{
log_printf( &logger, " %u", ( uint16_t )read_buff[ cnt ] );
Delay_ms( 300 );
}
log_printf( &logger, "\r\n" );
}
void main( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
