Header file for signal processing and FFT operations. More...

#include <stdint.h>
#include "arm_math.h"

Data Structures
struct	SIG_ADCRegister_t
	Structure to hold ADC conversion values from two channels. More...

struct	SIG_FreqDomain_t
	Structure representing a complex number in the frequency domain. More...

struct	SIG_PolarForm_t
	Structure representing the magnitude and phase of a frequency component. More...

struct	SIG_Handle_t
	Handle structure for managing signal processing tasks. More...

Macros
#define	OUTPUT_SINE_SIGNAL_LEN 10
	Length of the output sine wave signal array.

#define	OUTPUT_SINE_AUDIO_LEN 100
	Length of the output audio signal array.

#define	INPUT_BUFF_LEN 2048
	Length of the input buffer for ADC samples.

#define	BUFF_TO_DFT_LEN ( INPUT_BUFF_LEN / 2 )
	Number of samples to be used for the FFT (half of the input buffer length).

#define	FREQ_DOMAIN_LEN ( BUFF_TO_DFT_LEN / 2 )
	Number of frequency domain bins (quarter of the input buffer length).

#define	POLAR_FORM_LEN FREQ_DOMAIN_LEN
	Length of the polar form array (same as frequency domain length).

#define	ADC_MAX_VALUE 4095
	Maximum value of the ADC output (12-bit resolution).

#define	REF_VOLTAGE 3.3f
	Reference voltage for the ADC.

#define	ADC_HALF_COMPLETE_FLAG 0
	Flag indicating that the ADC conversion is complete for the first half of the buffer.

#define	ADC_FULL_COMPLETE_FLAG 1
	Flag indicating that the ADC conversion is complete for the entire buffer.

Typedefs
typedef struct SIG_Handle_t	SIG_Handle_t
	Handle structure for managing signal processing tasks.

Functions
void	sig_start (SIG_Handle_t *const handle)
	Starts the signal processing by initializing ADC and DAC, and starting timers.

void	sig_load_samples (SIG_Handle_t *const handle, uint8_t flag)
	Loads samples from the ADC buffer into the processing buffers.

size_t	sig_perform_fft (SIG_Handle_t *const handle)
	Performs FFT on the loaded signal data and computes magnitude and phase.

Variables
SIG_Handle_t	sig_handle

Detailed Description

Header file for signal processing and FFT operations.

This file contains the declarations for functions and data types used in signal processing tasks, including ADC and DAC setup, sample loading, and FFT operations. It defines constants, data structures, and function prototypes for managing and processing signals.

Created on: Jul 5, 2024 Author: Viktor

Function Documentation

◆ sig_load_samples()

void sig_load_samples	(	SIG_Handle_t *const	handle,
		uint8_t	flag )

Loads samples from the ADC buffer into the processing buffers.

Parameters

handle	Pointer to the SIG_Handle_t structure.
flag	Flag indicating the ADC conversion status (half or full completion).

Loads samples from the ADC buffer into the processing buffers.

This function copies samples from the input buffer to the processing buffers for further signal analysis. The samples are loaded based on the provided flag.

Parameters

handle	Pointer to the SIG_Handle_t structure containing the buffers.
flag	Flag indicating the completion status of ADC conversion.

◆ sig_perform_fft()

size_t sig_perform_fft ( SIG_Handle_t *const handle )

Performs FFT on the loaded signal data and computes magnitude and phase.

Parameters

handle Pointer to the SIG_Handle_t structure.

Returns: Index of the frequency with the maximum magnitude.

Performs FFT on the loaded signal data and computes magnitude and phase.

This function calculates the FFT of the input signals for both the receive and transmit coils. It then computes the magnitude and phase of the frequency domain data and returns the index of the maximum magnitude value.

Parameters

handle Pointer to the SIG_Handle_t structure containing the signal data.

Returns: size_t Index of the maximum magnitude value in the frequency domain.

◆ sig_start()

void sig_start ( SIG_Handle_t *const handle )

Starts the signal processing by initializing ADC and DAC, and starting timers.

Parameters

handle Pointer to the SIG_Handle_t structure.

Starts the signal processing by initializing ADC and DAC, and starting timers.

This function initializes the ADC and DAC peripherals, starts the ADC conversion in DMA mode, and begins the DAC output with a sine wave signal. It also starts the timer used for signal processing.

Parameters

handle Pointer to the SIG_Handle_t structure containing the configuration.

Variable Documentation

◆ sig_handle

SIG_Handle_t sig_handle

extern

Global handle for signal processing

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Function Documentation

◆ sig_load_samples()

◆ sig_perform_fft()

◆ sig_start()

Variable Documentation

◆ sig_handle