Atmel SAM3X8E - Frequenz bei Synchronen PWM Channels zu hoch

#include <Arduino.h>

void setup()

{

    PWMC_InitializeSync(6, 9, 1000, 1000, 250);

}

void loop()

{

}

void PWMC_InitializeSync(uint32_t ArduinoPin1, uint32_t ArduinoPin2, uint32_t PwmFrequency, uint16_t PwmPeriod, uint16_t PwmDutyCycle)

{

    if ( (PwmFrequency*PwmPeriod) < VARIANT_MCK )

    {

        pmc_enable_periph_clk(PWM_INTERFACE_ID);

        PWMC_ConfigureClocks(0, (PwmFrequency*PwmPeriod), VARIANT_MCK);

        PIO_Configure(

        g_APinDescription[ArduinoPin1].pPort,

        g_APinDescription[ArduinoPin1].ulPinType,

        g_APinDescription[ArduinoPin1].ulPin,

        g_APinDescription[ArduinoPin1].ulPinConfiguration);

        PIO_Configure(

        g_APinDescription[ArduinoPin2].pPort,

        g_APinDescription[ArduinoPin2].ulPinType,

        g_APinDescription[ArduinoPin2].ulPin,

        g_APinDescription[ArduinoPin2].ulPinConfiguration);

        /*PIO_Configure(

        g_APinDescription[0].pPort,

        g_APinDescription[0].ulPinType,

        g_APinDescription[0].ulPin,

        g_APinDescription[0].ulPinConfiguration);*/

        uint32_t channel1 = g_APinDescription[ArduinoPin1].ulPWMChannel;

        uint32_t channel2 = g_APinDescription[ArduinoPin2].ulPWMChannel;

        uint32_t channels = (1<<channel1) | (1<<channel2) | (1<<0);

        PWMC_ConfigureChannel(PWM_INTERFACE, 0, PWM_CMR_CPRE_CLKB, 0, 0);

        PWMC_ConfigureChannel(PWM_INTERFACE, channel1, PWM_CMR_CPRE_CLKB, 0, PWM_CMR_CPOL);

        PWMC_ConfigureChannel(PWM_INTERFACE, channel2, PWM_CMR_CPRE_CLKB, 0, 0);

        PWMC_SetPeriod(PWM_INTERFACE, channel1, PwmPeriod);

        PWMC_SetDutyCycle(PWM_INTERFACE, channel1, PwmDutyCycle);

        PWMC_SetPeriod(PWM_INTERFACE, channel2, PwmPeriod);

        PWMC_SetDutyCycle(PWM_INTERFACE, channel2, PwmDutyCycle);

        PWMC_SetPeriod(PWM_INTERFACE, 0, PwmPeriod);

        PWMC_SetDutyCycle(PWM_INTERFACE, 0, PwmDutyCycle);

        PWMC_ConfigureSyncChannel(PWM_INTERFACE, channels, PWM_SCM_UPDM_MODE1, 0, 0);

        PWMC_SetSyncChannelUpdatePeriod(PWM_INTERFACE, PwmPeriod);

        PWMC_EnableChannel(PWM_INTERFACE, 0);

    }

}