Sample Code For The Initial Configuration Of Eco Prescaler Settings - Infineon TRAVEO T2G family CYT4D Series Manual

Clock configuration setup in TRAVEO™ T2G family CYT4D series MCUs
Configuring the internal clock
5.10.3

Sample code for the initial configuration of ECO prescaler settings

Code Listing 44 to Code Listing 50
Code Listing 44 General configuration of ECO prescaler settings
#define ECO_PRESCALER_TARGET_FREQ (1234567ul)
#define CLK_FREQ_ECO
#define PATH_SOURCE_CLOCK_FREQ CLK_FREQ_ECO
/** Wait time definition **/
#define WAIT_FOR_STABILIZATION (10000ul)
int main(void)
{
:
/* Set Clock Configuring registers */
AllClockConfiguration();
:
/* Please check clock output using oscilloscope after CPU reached here. */
for(;;);
}
Code Listing 45 AllClockConfiguration() function
static void AllClockConfiguration(void)
{
/***** ECO prescaler setting ******/
{
:
cy_en_sysclk_status_t ecoPreStatus;
ecoPreStatus = Cy_SysClk_SetEcoPrescale(CLK_FREQ_ECO, ECO_PRESCALER_TARGET_FREQ);
CY_ASSERT(ecoPreStatus == CY_SYSCLK_SUCCESS);
ecoPreStatus = Cy_SysClk_EcoPrescaleEnable(WAIT_FOR_STABILIZATION);
CY_ASSERT(ecoPreStatus == CY_SYSCLK_SUCCESS);
}
return;
}
Code Listing 46 Cy_SysClk_SetEcoPrescale() function
cy_en_sysclk_status_t Cy_SysClk_SetEcoPrescale(uint32_t ecoFreq, uint32_t targetFreq)
{
// Frequency of ECO (4MHz ~ 33.33MHz) might exceed 32bit value if shifted 8 bit.
// So, it uses 64 bit data for fixed point operation.
// Lowest 8 bit are fractional value. Next 10 bit are integer value.
uint64_t fixedPointEcoFreq = ((uint64_t)ecoFreq << 8ull);
uint64_t fixedPointDivNum64;
uint32_t fixedPointDivNum;
// Culculate divider number
fixedPointDivNum64 = fixedPointEcoFreq / (uint64_t)targetFreq;
// Dividing num should be larger 1.0, and smaller than maximum of 10bit number.
if((fixedPointDivNum64 < 0x100ull) && (fixedPointDivNum64 > 0x40000ull))
{
return CY_SYSCLK_BAD_PARAM;
}
fixedPointDivNum = (uint32_t)fixedPointDivNum64;
Cy_SysClk_SetEcoPrescaleManual(
return CY_SYSCLK_SUCCESS;
}
Application Note
show the sample code.
(16000000ul)
Define waiting for stabilization.
(((fixedPointDivNum & 0x0003FF00ul) >> 8ul) - 1ul),
(fixedPointDivNum & 0x000000FFul)
);
ECO prescaler setting. See Code Listing
ECO prescaler setting. See Code Listing
Configure the ECO prescaler. See
59 of 80
Define the ECO prescaler target frequency.
Define the ECO clock frequency.
45.
46.
ECO prescaler enable. See Code Listing
Code Listing 47.
002-26071 Rev. *B
48.
2021-09-07