PMP21529: Current Controling with MCO of PMP21529 4-Switch buck-boost bi-directional DC-DC converter

The existing code in PMP21529 does not support this feature, however, you can add this feature by developing your own code.  

Do you mean that the UCD3138 controller IC (which includes a fully programmable 31.25 MHz, 32-bit ARM7TDMI-S processor) can communicate with an external MCU via I2C or UART, and can also be configured to set current limits while operating the unit?

ill check and let you know thanks 

and do you have any kind of reference code?

please, thank you