CCS: About usDelay( ) function in instaSPIN-FOC

Tool/software: Code Composer Studio

What are the differences between usDelay( ) function in usDelay.h and adc.c ?

in usDelay.h:

//! \brief     Provides a prescribes micro-second delay
//! \param[in] delay_usec  The delay, usec
extern void usDelay(const uint_least32_t delay_usec);

in adc.c:

// assembly file
extern void usDelay(uint32_t Count);