set system frequency in cces project

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Hi RuiZhang,

In Audio_passthrough_I2S and Audio_Loopback_TDM examples, the default system frequency is set  to the maximum frequency value (i.e SYSCLK Frequency=500 MHz, SCLK0=125 MHz, SCLK=250MHz) based on the configuration in preload code.

In most applications, the CGU and DMC initialization is only done once after the power up. This can be done with the help of “preload” code (when loading the application via emulator) or “init” code (when loading the application via booting). The CCES installation provides the “preload” and “init” code sources and dxes for the default CGU/DMC settings which can be modified as per the customized system requirements.

Please refer the "CGUPowerServiceConfig"  BSP example in the below path which demonstrates how to configure the PLL and CGU with multiple configurations.
<Installation path> :\Analog Devices\ADSP-2156x_EZ-KIT-Rel1.0.1\ADSP-2156x_EZ-KIT\Examples\services\pwr\CGUPowerServiceConfig

Regards,
Divya.P