PLL click

PLL click is a frequency multiplier which uses the Phase-Locked Loop (PLL) techniques to provide a high-frequency clock output from a cheap, standard fundamental mode crystal oscillator.

click Product page

Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : GPIO type

Software Support

We provide a library for the Pll 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 Pll Click driver.

Standard key functions :

• pll_cfg_setup Config Object Initialization function.

  void pll_cfg_setup ( pll_cfg_t *cfg ); 

• pll_init Initialization function.

  err_t pll_init ( pll_t *ctx, pll_cfg_t *cfg );

Example key functions :

• pll_set_clock_output This function settings clock output.

  void pll_set_clock_output ( pll_t *ctx, uint8_t mode );

• pll_set_pll_4x This function settings PLL x4.

  void pll_set_pll_4x ( pll_t *ctx );

• pll_set_pll_6x This function settings PLL x6.

  void pll_set_pll_6x ( pll_t *ctx );

Examples Description

This app sets PLL signals.

The demo application is composed of two sections :

Application Init

Initializes device.

void application_init ( void )
{
    log_cfg_t log_cfg;
    pll_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.
    pll_cfg_setup( &cfg );
    PLL_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pll_init( &pll, &cfg );
    pll_set_clock_output( &pll, PLL_CLOCK_ENABLE );
}

Application Task

Every 2 seconds, the PLL increases the input clock from min (x2) to max (x8) level.

void application_task ( void )
{
    log_printf( &logger, " PLL level: x2\r\n\n" );
    pll_set_pll_2x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x3\r\n\n" );
    pll_set_pll_3x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x3.125\r\n\n" );
    pll_set_pll_3_125x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x4\r\n\n" );
    pll_set_pll_4x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x5\r\n\n" );
    pll_set_pll_5x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x5.3125\r\n\n" );
    pll_set_pll_5_3125x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x6\r\n\n" );
    pll_set_pll_6x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x6.25\r\n\n" );
    pll_set_pll_6_25x( &pll );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, " PLL level: x8\r\n\n" );
    pll_set_pll_8x( &pll );
    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.Pll

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.