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This commit is contained in:
Mark Qvist 2014-04-06 20:26:24 +02:00
parent b4de1f73ea
commit 19cca9487a
6 changed files with 66 additions and 26 deletions
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41
Modem/afsk.h
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@ -1,19 +1,35 @@
//////////////////////////////////////////////////////
// First things first, all the includes we need //
//////////////////////////////////////////////////////
#ifndef FSK_MODEM_H
#define FSK_MODEM_H
#include "config.h"
#include "hardware.h"
#include "config.h" // Various configuration values
#include "hardware.h" // Hardware functions
#include <cfg/compiler.h>
#include <io/kfile.h>
#include <struct/fifobuf.h>
#include <cfg/compiler.h> // Compiler info from BertOS
#include <struct/fifobuf.h> // FIFO buffer implementation from BertOS
#include <io/kfile.h> // The BertOS KFile interface. This is
// used for letting other functions read
// from or write to the modem like a
// file descriptor.
//////////////////////////////////////////////////////
// Our type definitions and function declarations //
//////////////////////////////////////////////////////
#define SAMPLERATE 9600 // The rate at which we are sampling and synthesizing
#define BITRATE 1200 // The actual bitrate at baseband. This is the baudrate.
#define SAMPLESPERBIT (SAMPLERATE / BITRATE) // How many DAC/ADC samples constitute on bit (8).
#define SAMPLESPERBIT (SAMPLERATE / BITRATE) // How many DAC/ADC samples constitute one bit (8).
// This defines an errortype for a receive-
// buffer overrun.
#define RX_OVERRUN BV(0)
// This struct defines a Hdlc parser. It will let
// us parse the raw bits coming in from the modem
// and synchronise to byte boundaries.
typedef struct Hdlc
{
uint8_t demodulatedBits; // Incoming bitstream from demodulator
@ -22,11 +38,13 @@ typedef struct Hdlc
bool receiving; // Whether or not where actually receiving data (or just noise ;P)
} Hdlc;
#define RX_OVERRUN BV(0)
// This is our primary modem struct. It defines
// all the values we need to modulate and
// demodulate data from the physical medium.
typedef struct Afsk
{
KFile fd;
KFile fd; // A file descriptor for reading from and
// writing to the modem
// I/O hardware pins
int adcPin; // Pin for incoming signal
@ -94,9 +112,10 @@ INLINE Afsk *AFSK_CAST(KFile *fd) {
return (Afsk *)fd;
}
// Declare ISRs and initialization functions
// Declare Interrupt Service Routines
// and initialization functions
void afsk_adc_isr(Afsk *af, int8_t sample);
uint8_t afsk_dac_isr(Afsk *af);
void afsk_init(Afsk *af, int adc_ch, int dac_ch);
#endif
#endif