# Using ARMâ€™s CMSIS DSP Library: arm_sqrt_q15

I continue the ARM CMSIS DSP series, this time demonstrating arm_sqrt_q15. This function takes the sqrt of a fractional input, and returns the value (by reference) and some error detection. Here is the function definition: “in” really is a Q Format of 1.15. 0 is represented as 0x0000. 1 is represented as 0x7FFF. This means[…]