Create arm_fir_decimate_f64 based on arm_fir_decimate_f32

Include/dsp/filtering_functions.h

@@ -820,7 +820,7 @@ extern "C"
  } arm_fir_decimate_instance_q31;
 
 /**
- @brief Instance structure for floating-point FIR decimator.
+ @brief Instance structure for single precision floating-point FIR decimator.
  */
 typedef struct
  {
@@ -830,8 +830,53 @@ typedef struct
  float32_t *pState; /**< points to the state variable array. The array is of length numTaps+blockSize-1. */
  } arm_fir_decimate_instance_f32;
 
+ /**
+ @brief Instance structure for double precision floating-point FIR decimator.
+ */
+ typedef struct
+ {
+ uint8_t M; /**< decimation factor. */
+ uint16_t numTaps; /**< number of coefficients in the filter. */
+ const float64_t *pCoeffs; /**< points to the coefficient array. The array is of length numTaps.*/
+ float64_t *pState; /**< points to the state variable array. The array is of length numTaps+blockSize-1. */
+ } arm_fir_decimate_instance_f64;
 
-/**
+ /**
+ @brief Processing function for floating-point FIR decimator.
+ @param[in] S points to an instance of the floating-point FIR decimator structure
+ @param[in] pSrc points to the block of input data
+ @param[out] pDst points to the block of output data
+ @param[in] blockSize number of samples to process
+ */
+ void arm_fir_decimate_f64(
+ const arm_fir_decimate_instance_f64 * S,
+ const float64_t * pSrc,
+ float64_t * pDst,
+ uint32_t blockSize);
+
+
+ /**
+ @brief Initialization function for the floating-point FIR decimator.
+ @param[in,out] S points to an instance of the floating-point FIR decimator structure
+ @param[in] numTaps number of coefficients in the filter
+ @param[in] M decimation factor
+ @param[in] pCoeffs points to the filter coefficients
+ @param[in] pState points to the state buffer
+ @param[in] blockSize number of input samples to process per call
+ @return execution status
+ - \ref ARM_MATH_SUCCESS : Operation successful
+ - \ref ARM_MATH_LENGTH_ERROR : <code>blockSize</code> is not a multiple of <code>M</code>
+ */
+ arm_status arm_fir_decimate_init_f64(
+ arm_fir_decimate_instance_f64 * S,
+ uint16_t numTaps,
+ uint8_t M,
+ const float64_t * pCoeffs,
+ float64_t * pState,
+ uint32_t blockSize);
+
+
+ /**
  @brief Processing function for floating-point FIR decimator.
  @param[in] S points to an instance of the floating-point FIR decimator structure
  @param[in] pSrc points to the block of input data