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Diffstat (limited to 'lab3/RTDSP/intio.c')
| -rw-r--r-- | lab3/RTDSP/intio.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/lab3/RTDSP/intio.c b/lab3/RTDSP/intio.c new file mode 100644 index 0000000..32b539e --- /dev/null +++ b/lab3/RTDSP/intio.c @@ -0,0 +1,134 @@ +/************************************************************************************* + DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING + IMPERIAL COLLEGE LONDON + + EE 3.19: Real Time Digital Signal Processing + Dr Paul Mitcheson and Daniel Harvey + + LAB 3: Interrupt I/O + + ********* I N T I O. C ********** + + Demonstrates inputing and outputing data from the DSK's audio port using interrupts. + + ************************************************************************************* + Updated for use on 6713 DSK by Danny Harvey: May-Aug 2006 + Updated for CCS V4 Sept 10 + ************************************************************************************/ +/* + * You should modify the code so that interrupts are used to service the + * audio port. + */ +/**************************** Pre-processor statements ******************************/ + +#include <stdlib.h> +// Included so program can make use of DSP/BIOS configuration tool. +#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 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; + +short mono_in; + + /******************************* Function prototypes ********************************/ +void init_hardware(void); +void init_HWI(void); +void ISR_AIC(void); +/********************************** Main routine ************************************/ +void main(){ + + + // initialize board and the audio port + init_hardware(); + + /* initialize hardware interrupts */ + init_HWI(); + + /* loop indefinitely, waiting for interrupts */ + while(1) + {}; + +} + +/********************************** 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 + +} + +/******************** WRITE YOUR INTERRUPT SERVICE ROUTINE HERE***********************/ + + + +void ISR_AIC() +{ + short mono_out; + mono_in = mono_read_16Bit(); + mono_out = mono_in; //mono_in < 0 ? -mono_in : mono_in; + mono_write_16Bit(mono_out); +} |