/*---------------------------------------------------------------------------------------------------------*/
uint32_t DrvI2S_GetSourceClockFreq(void)
{
uint8_t u8ClkSrcSel;
uint32_t u32Freq = __XTAL;
u8ClkSrcSel = SYSCLK->CLKSEL2.I2S_S;
switch (u8ClkSrcSel)
{
case DRVI2S_EXT_12M:
u32Freq = __XTAL;
break;
case DRVI2S_PLL:
u32Freq = DrvSYS_GetPLLClockFreq();
break;
case DRVI2S_HCLK:
u32Freq = SystemCoreClock;
break;
case DRVI2S_INTERNAL_22M:
u32Freq = __IRC22M;
break;
}
return u32Freq;
}
/*----------------------------------------------------------------------------
Clock functions
This function is used to update the variable SystemCoreClock
and must be called whenever the core clock is changed.
*----------------------------------------------------------------------------*/
void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
{
uint32_t u32Freq, u32ClkSrc;
uint32_t u32HclkDiv;
/* Update PLL Clock */
PllClock = DrvSYS_GetPLLClockFreq();
u32ClkSrc = SYSCLK->CLKSEL0 & SYSCLK_CLKSEL0_HCLK_S_Msk;
if(u32ClkSrc != SYSCLK_CLKSEL0_HCLK_PLL)
{
/* Use the clock sources directly */
u32Freq = gau32ClkSrcTbl[u32ClkSrc];
}
else
{
/* Use PLL clock */
u32Freq = PllClock;
}
u32HclkDiv = (SYSCLK->CLKDIV & SYSCLK_CLKDIV_HCLK_N_Msk) + 1;
/* Update System Core Clock */
SystemCoreClock = u32Freq/u32HclkDiv;
CyclesPerUs = (SystemCoreClock + 500000) / 1000000;
}
/*---------------------------------------------------------------------------------------------------------*/
static uint32_t GetUartClk(void)
{
uint32_t clk =0 , div;
/* Check UART Clock Source Setting */
if(SYSCLK->CLKSEL1.UART_S == 0)
{
clk = DrvSYS_GetExtClockFreq(); /* Get External Clock From DrvSYS Setting */
}
else if(SYSCLK->CLKSEL1.UART_S == 1)
{
div = SYSCLK->CLKDIV.UART_N; /* According PLL Clock and UART_Divider to get clock */
clk = DrvSYS_GetPLLClockFreq()/ (div+1);
}
else
clk = __IRC22M; /* Clock 22Mhz */
return clk;
}
