OSD click

OSD Click features MAX7456 single-channel monochrome OSD module with integrated EEPROM memory as well as two RCA sockets. It is used to create on-screen menus and other video overlays, such as custom graphics, company logo, time and date using 256 user-programmable characters or pictographs.

click Product page

Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : SPI type

Software Support

We provide a library for the OSD 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for OSD Click driver.

Standard key functions :

• osd_cfg_setup Config Object Initialization function.

  void osd_cfg_setup ( osd_cfg_t *cfg ); 

• osd_init Initialization function.

  err_t osd_init ( osd_t *ctx, osd_cfg_t *cfg );

• osd_default_cfg Click Default Configuration function.

  void osd_default_cfg ( osd_t *ctx );

Example key functions :

• osd_clear_display_memory This function clears display memory.

  void osd_clear_display_memory( osd_t *ctx );

• osd_insert_custom_char This function writes custom character.

  void osd_insert_custom_char( osd_t *ctx, uint8_t chr_address, uint8_t custom_char );

• osd_enable_video_buffer This function enables video buffer.

  void osd_enable_video_buffer( osd_t *ctx );

Examples Description

This demo performs basic OSD Click functionality - write text on screen.

The demo application is composed of two sections :

Application Init

Device initialization.

void application_init ( void )
{
    log_cfg_t log_cfg;
    osd_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.
    osd_cfg_setup( &cfg );
    OSD_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    osd_init( &osd, &cfg );

    osd_default_cfg( &osd );
    osd_clears_char_places( &osd, 0, 0, 16, 30 );
    log_info( &logger, " Application Task " );
}

Application Task

Write text on the screen, write character per 1 second in the first, seventh and fifteenth row of the screen.

void application_task ( void )
{
    log_printf( &logger, "\r\n Writing characters on the screen...\r\n" );
    for ( uint8_t cnt = 0; cnt < 30; cnt++ )
    {
        if ( HEADER_TEXT[ cnt ] != ' ' )
        {
            osd_write_character( &osd, 1, cnt, HEADER_TEXT[ cnt ] );
        }

        if ( MESSAGE_TEXT[ cnt ] != ' ' )
        {
            osd_write_character( &osd, 7, cnt, MESSAGE_TEXT[ cnt ] );
        }

        if ( FOOTER_TEXT[ cnt ] != ' ' )
        {
            osd_write_character( &osd, 14, cnt, FOOTER_TEXT[ cnt ] );
        }

        Delay_ms ( 1000 );
    }

    log_printf( &logger, " Clear display\r\n" );
    osd_clears_char_places( &osd, 0, 0, 16, 30 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}  

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.OSD

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.