Functions

Functions
int32_t	Cy_SysClk_ImoTrim (uint32_t imoFreq, cy_en_sysclk_calib_formula_t order)
	Trims the IMO to be as close to requested frequency as possible. More...
int32_t	Cy_SysClk_PiloTrim (uint32_t piloFreq, cy_en_sysclk_calib_formula_t order)
	Trims the PILO to be as close to 32,768 Hz as possible. More...

Detailed Description

Function Documentation

Cy_SysClk_ImoTrim()

int32_t Cy_SysClk_ImoTrim	(	uint32_t	imoFreq,
		cy_en_sysclk_calib_formula_t	order
	)

Trims the IMO to be as close to requested frequency as possible.

Parameters

imoFreq	current IMO frequency. Call Cy_SysClk_CalibStart and other measurement functions to obtain the current frequency of the IMO.
order	type of the calibration cy_en_sysclk_calib_formula_t which will be executed.

Returns

Change in trim value - 0 if done; that is, no change in trim value.

Function Usage

    #define CLOCK1_VALUE (0xFFFEUL)
    /* set clock1 (time window) as HPOSC
     * set clock2 (measured frequency) as IMO
     * set time window as 0xFFFE counts of the HPOSC
     */
    retVal = Cy_SysClk_CalibStart(CY_SYSCLK_MEAS_CLK_HPOSC, CLOCK1_VALUE, CY_SYSCLK_MEAS_CLK_IMO);
    if (retVal == CY_SYSCLK_SUCCESS)
    {
        /* wait until calibration is done */
        while(!Cy_SysClk_CalibDone());
        /* get calculated IMO frequency */
        /*
         * measured clock is clock2 = true,
         * time window was 0xFFFE counts of the clock1
         */
        imo = Cy_SysClk_CalibGetFreq(true, CLOCK1_VALUE);
        trim = Cy_SysClk_ImoTrim(imo, CY_SYSCLK_CALIB_FIRST_ORDER);
    }

Cy_SysClk_PiloTrim()

int32_t Cy_SysClk_PiloTrim	(	uint32_t	piloFreq,
		cy_en_sysclk_calib_formula_t	order
	)

Trims the PILO to be as close to 32,768 Hz as possible.

Parameters

piloFreq	current PILO frequency. Call Cy_SysClk_CalibStart and other measurement functions to obtain the current frequency of the PILO.
order	type of the calibration cy_en_sysclk_calib_formula_t which will be executed

Returns

Change in trim value; 0 if done, that is, no change in trim value.

Function Usage

    #define CLOCK1_VALUE (0xFFFEUL)
    /* set clock1 (time window) as HPOSC
     * set clock2 (measured frequency) as PILO
     * set time window as 0xFFFE counts of the HPOSC
     */
    retVal = Cy_SysClk_CalibStart(CY_SYSCLK_MEAS_CLK_HPOSC, CLOCK1_VALUE, CY_SYSCLK_MEAS_CLK_PILO);
    if (retVal == CY_SYSCLK_SUCCESS)
    {
        /* wait until calibration is done */
        while(!Cy_SysClk_CalibDone());
        /* get calculated PILO frequency */
        /*
         * measured clock is clock2 = true,
         * time window was 0xFFFE counts of the clock1
         */
        pilo = Cy_SysClk_CalibGetFreq(true, CLOCK1_VALUE);
        trim = Cy_SysClk_PiloTrim(pilo, CY_SYSCLK_CALIB_FIRST_ORDER);
    }