SWI EEPROM Click

SWI EEPROM Click is a compact add-on board that provides a highly reliable memory solution. This board features the AT21CS01, a single-wire serial EEPROM with a unique, factory-programmed 64-bit serial number from Microchip Technology. The AT21CS01 has an ultra-high write endurance capability allowing more than one million cycles for each memory location to meet the requirements for today's high-write endurance applications. It is internally as 128 words of 8 bits each with achieved communication through a single I/O pin with Standard-Speed and High-Speed mode options. Also, it offers a security register with a factory-programmed serial number, which makes it the easiest way to add identification to various accessories and consumables.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Jun 2023.
• Type : GPIO type

Software Support

We provide a library for the SWI EEPROM 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 from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for SWI EEPROM Click driver.

Standard key functions :

• swieeprom_cfg_setup Config Object Initialization function.

  void swieeprom_cfg_setup ( swieeprom_cfg_t *cfg );

• swieeprom_init Initialization function.

  err_t swieeprom_init ( swieeprom_t *ctx, swieeprom_cfg_t *cfg );

Example key functions :

• swieeprom_mem_write_page This function writes data to the specified memory address page.

  err_t swieeprom_mem_write_page ( swieeprom_t *ctx, uint8_t start_addr, uint8_t *data_in, uint8_t len );

• swieeprom_mem_read This function reads data from the specified memory address.

  err_t swieeprom_mem_read ( swieeprom_t *ctx, uint8_t start_addr, uint8_t *data_out, uint8_t len );

• swieeprom_mem_clear This function clears the whole memory to zero.

  err_t swieeprom_mem_clear ( swieeprom_t *ctx );

Example Description

This example demonstrates the use of SWI EEPROM Click board by writing specified data to the memory and reading it back.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and checks the communication.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger 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.
    swieeprom.swi_reset = &swieeprom_reset;
    swieeprom.swi_start_stop = &swieeprom_start_stop;
    swieeprom.swi_logic_0 = &swieeprom_logic_write_0;
    swieeprom.swi_logic_1 = &swieeprom_logic_write_1;
    swieeprom.swi_logic_read = &swieeprom_logic_read;
    if ( SWIEEPROM_ERROR == swieeprom_init ( &swieeprom ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( SWIEEPROM_ERROR == swieeprom_check_communication ( &swieeprom ) )
    {
        log_error( &logger, " Check communication." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Writes the specified text message to the memory and reads it back. After that, erases the whole memory and tries to read the same message verifying that the memory is erased. All data is being displayed on the USB UART where you can track the program flow.

void application_task ( void )
{
    uint8_t data_buf[ 8 ] = { 0 };
    // Write data to the specified address
    log_printf ( &logger, " Memory address: 0x%.2X\r\n", ( uint16_t ) STARTING_ADDRESS );
    memcpy ( data_buf, DEMO_TEXT_MESSAGE, strlen ( DEMO_TEXT_MESSAGE ) );
    if ( SWIEEPROM_OK == swieeprom_mem_write_page ( &swieeprom, STARTING_ADDRESS, 
                                                    data_buf, strlen ( DEMO_TEXT_MESSAGE ) ) )
    {
        log_printf ( &logger, " Write data: %s\r\n", data_buf );
        Delay_ms ( 100 );
    }
    // Read data from the specified address to verify the previous memory write
    memset ( data_buf, 0, sizeof ( data_buf ) );
    if ( SWIEEPROM_OK == swieeprom_mem_read ( &swieeprom, STARTING_ADDRESS, 
                                              data_buf, sizeof ( data_buf ) ) )
    {
        log_printf ( &logger, " Read data: %s\r\n", data_buf );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
    // Clear whole memory
    if ( SWIEEPROM_OK == swieeprom_mem_clear ( &swieeprom ) )
    {
        log_printf ( &logger, " Memory clear\r\n" );
        Delay_ms ( 100 );
    }
    // Read data from the specified address to verify the previous memory clear
    memset ( data_buf, 0, sizeof ( data_buf ) );
    if ( SWIEEPROM_OK == swieeprom_mem_read ( &swieeprom, STARTING_ADDRESS, 
                                              data_buf, sizeof ( data_buf ) ) )
    {
        log_printf ( &logger, " Read data: %s\r\n\n", data_buf );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
}

Note

This application is written for the following MCUs and specifically for MIKROBUS 1: STM32F407ZG, MK64FN1M0VDC12, TM4C129XNCZAD, GD32VF103VBT6, PIC32MX795F512L In order to use it on another MCUs the pin_x functions must be defined in a way it matches the required timing specifications for the Single Wire interface.

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.SWIEEPROM

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. UART terminal is available in all MikroElektronika compilers.