12 years, 3 months ago.

Some additional information see https://community.freescale.com/thread/301328

/*

• init_clocks()
• Set the PLL to 48MUz from the 8Mz xtal on the
• Freedom board.
• Returns:
• The freequency set from the divide/multiply register values.
• /

int init_clocks() { signed char prdiv; signed char vdiv; Set the core/system clock to divide by 2. SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1);

12.2.3 Selects the MCGPLLCLK or MCGFLLCLK clock for various peripheral clocking options. SIM_SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK;

12.2.1 Set OSC32KSEL to 00 to select the System oscillator SIM_SOPT1 &= (SIM_SOPT1_OSC32KSEL(3));

Select MCGFLLCLK clock or MCGPLLCLK/2 fpr TPM SIM_SOPT2 &= SIM_SOPT2_TPMSRC(3); SIM_SOPT2 |= SIM_SOPT2_TPMSRC(1);

Set up for external XTAL. 10.3.1 KL25 Signal Multiplexing and Pin Assignments Set pin function to EXTAL - Clear to 0 (pin 40) PORTA_PCR18 &= (PORT_PCR_ISF_MASK | PORT_PCR_MUX(7));

Set pin function to XTAL - Clear to 0 PORTA_PCR19 &= (PORT_PCR_ISF_MASK | PORT_PCR_MUX(7));

FBE Mode OSC0_CR = OSC_CR_ERCLKEN_MASK; MCG_C2 = (MCG_C2_RANGE0(2) | MCG_C2_EREFS0_MASK); MCG_C1 = (MCG_C1_CLKS(2) | MCG_C1_FRDIV(3) | MCG_C1_IRCLKEN_MASK); MCG_C4 &= (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(3)); MCG_C5 = MCG_C5_PRDIV0(3); MCG_C6 = 0x00U;

Wait for FLL extern ref. while((MCG_S & MCG_S_IREFST_MASK) != 0)

Wait for external ref. select. while((MCG_S & MCG_S_CLKST_MASK) != 8)

PBE MCG_C2 = (MCG_C2_RANGE0(2) | MCG_C2_EREFS0_MASK); MCG_C6 = MCG_C6_PLLS_MASK;

Wait for lock. while((MCG_S & MCG_S_LOCK0_MASK) == 0)

PEE Mode MCG_C1 = (MCG_C1_FRDIV(3) | MCG_C1_IRCLKEN_MASK);

Wait for PLL select. while((MCG_S &MCG_S_CLKST_MASK) !=MCG_S_CLKST_MASK)

Use actual PLL settings to calculate PLL frequency prdiv = ((MCG_C5 & MCG_C5_PRDIV0_MASK) + 1); vdiv = ((MCG_C6 & MCG_C6_VDIV0_MASK) + 24); return ((8000000 / prdiv) * vdiv); }

Can anybody transfer this code to something which we can use to change the conversion rate of the ADC?