Functions

General Description

Functions
void	Cy_SysClk_ExtClkSetFrequency (uint32_t freq)
	Sets the signal frequency of the External Clock Source (EXTCLK) into the internal storage to be used in Cy_SysClk_ClkHfGetFrequency. More...
uint32_t	Cy_SysClk_ExtClkGetFrequency (void)
	Returns the frequency of the External Clock Source (EXTCLK) from the internal storage. More...

Function Documentation

Cy_SysClk_ExtClkSetFrequency()

void Cy_SysClk_ExtClkSetFrequency

(

uint32_t

freq

)

Sets the signal frequency of the External Clock Source (EXTCLK) into the internal storage to be used in Cy_SysClk_ClkHfGetFrequency.

Parameters

freq	The frequency of the External Clock Source.

Function Usage

    /* Scenario: External precision 5MHz clock is needed to source clock path 1. */

    /* Configure the external clock input pin */
#if defined(CYT2BL5CAS) || defined(CYT2B75CAS) || defined(CY_DEVICE_SERIES_XMC7100) || defined(CY_DEVICE_SERIES_XMC7200)
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT21, 2, CY_GPIO_DM_HIGHZ, 0x00u, P21_2_SRSS_EXT_CLK);
#elif defined(CY_DEVICE_TVIIC2D6M)
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT15, 4, CY_GPIO_DM_HIGHZ, 0x00u, P15_4_SRSS_EXT_CLK);
#else
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT0, 5, CY_GPIO_DM_HIGHZ, 0x00u, P0_5_SRSS_EXT_CLK);
#endif
    /* Set the EXTCLK frequency to 5MHz */
    Cy_SysClk_ExtClkSetFrequency(5000000UL);
    /* Set the EXTCLK as the source for clock path 1 */
    (void)Cy_SysClk_ClkPathSetSource(1UL, CY_SYSCLK_CLKPATH_IN_EXT);

    /* In case if there is a need to get the EXT CLK frequency */
    uint32_t extClkFreq = Cy_SysClk_ExtClkGetFrequency();

Cy_SysClk_ExtClkGetFrequency()

uint32_t Cy_SysClk_ExtClkGetFrequency

(

void

)

Returns the frequency of the External Clock Source (EXTCLK) from the internal storage.

Returns

The frequency of the External Clock Source.

Function Usage

    /* Scenario: External precision 5MHz clock is needed to source clock path 1. */

    /* Configure the external clock input pin */
#if defined(CYT2BL5CAS) || defined(CYT2B75CAS) || defined(CY_DEVICE_SERIES_XMC7100) || defined(CY_DEVICE_SERIES_XMC7200)
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT21, 2, CY_GPIO_DM_HIGHZ, 0x00u, P21_2_SRSS_EXT_CLK);
#elif defined(CY_DEVICE_TVIIC2D6M)
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT15, 4, CY_GPIO_DM_HIGHZ, 0x00u, P15_4_SRSS_EXT_CLK);
#else
    (void)Cy_GPIO_Pin_FastInit(GPIO_PRT0, 5, CY_GPIO_DM_HIGHZ, 0x00u, P0_5_SRSS_EXT_CLK);
#endif
    /* Set the EXTCLK frequency to 5MHz */
    Cy_SysClk_ExtClkSetFrequency(5000000UL);
    /* Set the EXTCLK as the source for clock path 1 */
    (void)Cy_SysClk_ClkPathSetSource(1UL, CY_SYSCLK_CLKPATH_IN_EXT);

    /* In case if there is a need to get the EXT CLK frequency */
    uint32_t extClkFreq = Cy_SysClk_ExtClkGetFrequency();