# CP_IsSqrtBusy

## C Specification

  `#include <nitro/cp.h>`
  `s32 CP_IsSqrtBusy( void );`

## Arguments

None.

## Return Values

Determines whether square root calculator is busy. 0 means ready state and non-0 means busy state.

## Description

Checks whether square root calculator is busy or not. After writing in a square root calculation register, it will be in a busy state for a fixed cycle period. When acquiring results of square root calculation, you need to read when it is no longer busy. The calculation cycle is as follows. (The calculation cycle is a cycle number based on 33.514 MHz. The CPU cycle conversion is a cycle number based on 67.028 MHz.):)

Division Mode | Calculation | Calculation Cycles | CPU Cycle Conversion
CP_SQRT_32BIT_MODE | Square root calculation of 32-bit value | 13 cycles | 26 cycles
CP_SQRT_64BIT_MODE | Square root calculation of 64-bit value | 13 cycles | 26 cycles

## Internal Operation

`Reference SQRTCNT(0x40002B0) of the IO register.
`

## See Also

`CP_SetSqrtImm*`, `CP_SetSqrt*`, `CP_WaitSqrt`, `CP_GetSqrtResult*`

## Revision History

11/02/2004 Corrected the error in cycle numbers. Changed the function type in the C Specification from int to s32.
06/16/2004 Added description of cycle number.
01/09/2004 Added content.
12/01/2003 Initial version.