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Diffstat (limited to 'Project/RTDSP/frame.c')
| -rw-r--r-- | Project/RTDSP/frame.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/Project/RTDSP/frame.c b/Project/RTDSP/frame.c deleted file mode 100644 index a8fd350..0000000 --- a/Project/RTDSP/frame.c +++ /dev/null @@ -1,207 +0,0 @@ -/************************************************************************************* - DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING - IMPERIAL COLLEGE LONDON - - EE 3.19: Real Time Digital Signal Processing - Dr Paul Mitcheson and Daniel Harvey - - LAB 6: Frame Processing - - ********* F R A M E. C ********** - - Demonstrates Frame Processing (Interrupt driven) on the DSK. - - ************************************************************************************* - Updated for use on 6713 DSK by Danny Harvey: May-Aug 2006 - Updated for ccsV4 Sept 2010 - ************************************************************************************/ -/* - * You should modify the code so that an FFT is applied to an input frame - * which is then IFFT'd and sent to the audio port. - */ -/**************************** Pre-processor statements ******************************/ - -// Included so program can make use of DSP/BIOS configuration tool. -#include <stdlib.h> -#include "dsp_bios_cfg.h" - -/* The file dsk6713.h must be included in every program that uses the BSL. This - example also includes dsk6713_aic23.h because it uses the - AIC23 codec module (audio interface). */ -#include "dsk6713.h" -#include "dsk6713_aic23.h" - -// math library (trig functions) -#include <math.h> - -/* Some functions to help with Complex algebra and FFT. */ -#include "cmplx.h" -#include "fft_functions.h" - -// Some functions to help with writing/reading the audio ports when using interrupts. -#include <helper_functions_ISR.h> - - - -/******************************* Global declarations ********************************/ - -/* Audio port configuration settings: these values set registers in the AIC23 audio - interface to configure it. See TI doc SLWS106D 3-3 to 3-10 for more info. */ -DSK6713_AIC23_Config Config = { \ - /**********************************************************************/ - /* REGISTER FUNCTION SETTINGS */ - /**********************************************************************/\ - 0x0017, /* 0 LEFTINVOL Left line input channel volume 0dB */\ - 0x0017, /* 1 RIGHTINVOL Right line input channel volume 0dB */\ - 0x01f9, /* 2 LEFTHPVOL Left channel headphone volume 0dB */\ - 0x01f9, /* 3 RIGHTHPVOL Right channel headphone volume 0dB */\ - 0x0011, /* 4 ANAPATH Analog audio path control DAC on, Mic boost 20dB*/\ - 0x0000, /* 5 DIGPATH Digital audio path control All Filters off */\ - 0x0000, /* 6 DPOWERDOWN Power down control All Hardware on */\ - 0x0043, /* 7 DIGIF Digital audio interface format 16 bit */\ - 0x008d, /* 8 SAMPLERATE Sample rate control 8 KHZ */\ - 0x0001 /* 9 DIGACT Digital interface activation On */\ - /**********************************************************************/ -}; - -// Codec handle:- a variable used to identify audio interface -DSK6713_AIC23_CodecHandle H_Codec; - -// PI defined here for use in your code -#define PI 3.141592653589793 - -#define BUFLEN 128 /* Frame buffer length must be even for real fft */ - - -/* Pointers to data buffers */ -float *input; -float *intermediate; -float *output; -volatile int index = 0; - - - /******************************* Function prototypes *******************************/ -void init_hardware(void); -void init_HWI(void); -void ISR_AIC(void); -void init_arrays(void); -void wait_buffer(void); - -/********************************** Main routine ************************************/ -void main() -{ - - /* setup arrays */ - init_arrays(); - - /* initialize board and the audio port */ - init_hardware(); - - /* initialize hardware interrupts */ - init_HWI(); - - - /* loop indefinitely, waiting for interrupts */ - while(1) - { - wait_buffer(); - }; - -} - - - -/********************************** init_hardware() *********************************/ -void init_hardware() -{ - // Initialize the board support library, must be called first - DSK6713_init(); - - // Start the AIC23 codec using the settings defined above in config - H_Codec = DSK6713_AIC23_openCodec(0, &Config); - - /* Function below sets the number of bits in word used by MSBSP (serial port) for - receives from AIC23 (audio port). We are using a 32 bit packet containing two - 16 bit numbers hence 32BIT is set for receive */ - MCBSP_FSETS(RCR1, RWDLEN1, 32BIT); - - /* Configures interrupt to activate on each consecutive available 32 bits - from Audio port hence an interrupt is generated for each L & R sample pair */ - MCBSP_FSETS(SPCR1, RINTM, FRM); - - /* These commands do the same thing as above but applied to data transfers to - the audio port */ - MCBSP_FSETS(XCR1, XWDLEN1, 32BIT); - MCBSP_FSETS(SPCR1, XINTM, FRM); - - -} -/********************************** init_HWI() **************************************/ -void init_HWI(void) -{ - IRQ_globalDisable(); // Globally disables interrupts - IRQ_nmiEnable(); // Enables the NMI interrupt (used by the debugger) - IRQ_map(IRQ_EVT_RINT1,4); // Maps an event to a physical interrupt - IRQ_enable(IRQ_EVT_RINT1); // Enables the event - IRQ_globalEnable(); // Globally enables interrupts - -} -/************************** Allocate memory for arrays *******************************/ -void init_arrays(void) -{ - input = (float *) calloc(BUFLEN, sizeof(float)); /* Input array */ - output = (float *) calloc(BUFLEN, sizeof(float)); /* Output array */ - intermediate = (float *) calloc(BUFLEN, sizeof(float)); /* Array for processing*/ -} - -/*************************** INTERRUPT SERVICE ROUTINE ******************************/ - -// Map this to the appropriate interrupt in the DSP BIOS - -void ISR_AIC(void) -{ - short sample; - float scale = 11585; - - sample = mono_read_16Bit(); - - /* add new data to input buffer - and scale so that 1v ~= 1.0 */ - input[index] = ((float)sample)/scale; - - /* write new output data */ - mono_write_16Bit((short)(output[index]*scale)); - - /* update index and check for full buffer */ - if (++index == BUFLEN) - index=0; -} - -/******************* Wait for buffer of data to be input/output **********************/ -void wait_buffer(void) -{ - float *p; - - /* wait for array index to be set to zero by ISR */ - while(index); - - /* rotate data arrays */ - p = input; - input = output; - output = intermediate; - intermediate = p; - - /************************* DO PROCESSING OF FRAME HERE **************************/ - - - /*please add your code */ - - - /**********************************************************************************/ - - /* wait here in case next sample has not yet been read in */ - while(!index); -} - - - |