X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fnet%2Fafsk.h;h=2f1a2e08cecf56b99790b2e57aef45f843b71043;hb=a5d199ea6aed560d3b62c41b73d16d500ba51b99;hp=dc2cf73a81dcf69ec8669c7c9499f6dcd99ebade;hpb=75ffb2070346a144a9fa1c9301b789a7fc03f8fa;p=bertos.git

diff --git a/bertos/net/afsk.h b/bertos/net/afsk.h
index dc2cf73a..2f1a2e08 100644
--- a/bertos/net/afsk.h
+++ b/bertos/net/afsk.h
@@ -44,13 +44,81 @@
 #ifndef DRV_AFSK_H
 #define DRV_AFSK_H
 
+#include "cfg/cfg_afsk.h"
+#include "hw/hw_afsk.h"
+
 #include <kern/kfile.h>
 #include <cfg/compiler.h>
-#include "hw/hw_afsk.h"
+#include <struct/fifobuf.h>
+
+
+// Demodulator constants
+#define SAMPLERATE 9600
+#define BITRATE    1200
+
+#define SAMPLEPERBIT (SAMPLERATE / BITRATE)
+
 
 typedef struct Afsk
 {
-  KFile fd;
+	KFile fd;
+
+	/** Current sample of bit for output data. */
+	uint8_t sample_count;
+
+	/** Current character to be modulated */
+	uint8_t curr_out;
+
+	/** Mask of current modulated bit */
+	uint8_t tx_bit;
+
+	/** True if bit stuff is allowed, false otherwise */
+	bool bit_stuff;
+
+	/** Counter for bit stuffing */
+	uint8_t stuff_cnt;
+	/**
+	 * DDS phase accumulator for generating modulated data.
+	 */
+	uint16_t phase_acc;
+
+	/** Current phase increment for current modulated bit */
+	uint16_t phase_inc;
+
+	/** Delay line used to delay samples by (SAMPLEPERBIT / 2) */
+	FIFOBuffer delay_fifo;
+
+	/**
+	 * Buffer for delay FIFO.
+	 * The 1 is added because the FIFO macros need
+	 * 1 byte more to handle a buffer (SAMPLEPERBIT / 2) bytes long.
+	 */
+	int8_t delay_buf[SAMPLEPERBIT / 2 + 1];
+
+	FIFOBuffer rx_fifo;
+	uint8_t rx_buf[CONFIG_AFSK_RX_BUFLEN];
+
+	FIFOBuffer tx_fifo;
+	uint8_t tx_buf[CONFIG_AFSK_TX_BUFLEN];
+
+	int16_t iir_x[2];
+	int16_t iir_y[2];
+
+	uint8_t sampled_bits;
+	uint8_t found_bits;
+	int8_t curr_phase;
+
+	/* True while modem sends data */
+	volatile bool sending;
+
+
+	bool hdlc_rxstart;
+	uint8_t hdlc_currchar;
+	uint8_t hdlc_bit_idx;
+	uint8_t hdlc_demod_bits;
+
+	uint16_t preamble_len;
+	uint16_t trailer_len;
 } Afsk;
 
 #define KFT_AFSK MAKE_ID('A', 'F', 'S', 'K')
@@ -61,8 +129,11 @@ INLINE Afsk *AFSK_CAST(KFile *fd)
   return (Afsk *)fd;
 }
 
+void afsk_adc_isr(Afsk *af, int8_t curr_sample);
+void afsk_dac_isr(Afsk *af);
 void afsk_init(Afsk *af);
 
+
 /**
  * \name afsk filter type
  * $WIZ$ afsk_filter_list = "AFSK_BUTTERWORTH", "AFSK_CHEBYSHEV"