DSP程序含义

是的。

详见：C:\ti\controlSUITE\libs\math\IQmath\v160\doc\IQmath_Quickstart.pdf

This intrinsic saturates an IQ value to the given Positive and Negative limits. This operation is useful in areas where there is potential for overflow in a calculation.

Example:
Calculate the linear equation "Y = M*X + B", with saturation.
All variables are GLOBAL_Q = 26. However, there is a possibility that the variable ranges may cause overflow, so we must perform the calculation and saturate the result.
To do this, we perform the intermediate operations using IQ = 20 and then saturate before converting the result back to the appropriate GLOBAL_Q value:

#include “IQmathLib.h
void main(void)
{
    _iq Y, M, X, B; // GLOBAL_Q = 26 (+/- 32 range)
    _iq20 temp; // IQ = 20 (+/- 2048 range)
    temp = _IQ20mpy(_IQtoIQ20(M), _IQtoIQ20(X)) + _IQtoIQ20(B);
    temp = _IQsat(temp, _IQtoIQ20(MAX_IQ_POS), _IQtoIQ20(MAX_IQ_NEG));
    Y = _IQ20toIQ(temp);
}