FRDM KL25Z - FFT

nithinkumar — Fri, 05 Dec 2014 00:32:57 GMT

Does the FRDM KL25Z (Arm Cortex M0+) support this DSP instruction "arm_rfft_init_q15" ? This function throws me some errors when I try to build.. The error that I got "Too many arguments passing"

Re: FRDM KL25Z - FFT

Jorge_Gonzalez — Tue, 09 Dec 2014 23:24:31 GMT

Hello Nithin Kumar:

Yes, I think that function is supported. I tried to use it in a project for KL25 with CW v10.6 and it compiled without errors, just a couple of warnings since I used random parameters.

As the error implies, you may be including more parameters than required, it should only receive 5 parameters as the description indicates:

arm_status arm_rfft_init_q15(

arm_rfft_instance_q15 * S,

arm_cfft_radix4_instance_q15 * S_CFFT,

uint32_t fftLenReal,

uint32_t ifftFlagR,

uint32_t bitReverseFlag);

* @param[in, out] *S points to an instance of the Q15 RFFT/RIFFT structure.

* @param[in] *S_CFFT points to an instance of the Q15 CFFT/CIFFT structure.

* @param[in] fftLenReal length of the FFT.

* @param[in] ifftFlagR flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.

* @param[in] bitReverseFlag flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.

The next threads in the community might also be useful:

https://community.freescale.com/thread/329163

https://community.freescale.com/thread/324740

Regards!,
Jorge Gonzalez

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