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29 * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
33 * \brief AFSK1200 modem.
36 * \author Francesco Sacchi <asterix@develer.com>
38 * $WIZ$ module_name = "afsk"
39 * $WIZ$ module_configuration = "bertos/cfg/cfg_afsk.h"
40 * $WIZ$ module_depends = "timer", "kfile"
41 * $WIZ$ module_hw = "bertos/hw/hw_afsk.h"
47 #include "cfg/cfg_afsk.h"
48 #include "hw/hw_afsk.h"
50 #include <kern/kfile.h>
51 #include <cfg/compiler.h>
52 #include <struct/fifobuf.h>
55 // Demodulator constants
56 #define SAMPLERATE 9600
59 #define SAMPLEPERBIT (SAMPLERATE / BITRATE)
66 /** Current sample of bit for output data. */
69 /** Current character to be modulated */
72 /** Mask of current modulated bit */
75 /** True if bit stuff is allowed, false otherwise */
78 /** Counter for bit stuffing */
81 * DDS phase accumulator for generating modulated data.
85 /** Current phase increment for current modulated bit */
88 /** Delay line used to delay samples by (SAMPLEPERBIT / 2) */
89 FIFOBuffer delay_fifo;
92 * Buffer for delay FIFO.
93 * The 1 is added because the FIFO macros need
94 * 1 byte more to handle a buffer (SAMPLEPERBIT / 2) bytes long.
96 int8_t delay_buf[SAMPLEPERBIT / 2 + 1];
99 uint8_t rx_buf[CONFIG_AFSK_RX_BUFLEN];
102 uint8_t tx_buf[CONFIG_AFSK_TX_BUFLEN];
107 uint8_t sampled_bits;
111 /* True while modem sends data */
112 volatile bool sending;
116 uint8_t hdlc_currchar;
117 uint8_t hdlc_bit_idx;
118 uint8_t hdlc_demod_bits;
120 uint16_t preamble_len;
121 uint16_t trailer_len;
124 #define KFT_AFSK MAKE_ID('A', 'F', 'S', 'K')
126 INLINE Afsk *AFSK_CAST(KFile *fd)
128 ASSERT(fd->_type == KFT_AFSK);
132 void afsk_adc_isr(Afsk *af, int8_t curr_sample);
133 void afsk_dac_isr(Afsk *af);
134 void afsk_init(Afsk *af);
138 * \name afsk filter type
139 * $WIZ$ afsk_filter_list = "AFSK_BUTTERWORTH", "AFSK_CHEBYSHEV"
142 #define AFSK_BUTTERWORTH 0
143 #define AFSK_CHEBYSHEV 1
146 int afsk_testSetup(void);
147 int afsk_testRun(void);
148 int afsk_testTearDown(void);