seniordesign-firmware Changeset - 9716361162e0

Changeset - 9716361162e0

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ethanzonca@CL-SEC241-08.cedarville.edu - 12 years ago 2012-11-08 15:40:33
ethanzonca@CL-SEC241-08.cedarville.edu

ax25 implementation complete (compiles)

5 files changed with 27 insertions and 6 deletions:

master/master/config.h

master/master/lib/afsk.c

master/master/lib/afsk.h

master/master/lib/ax25.c

master/master/lib/ax25.h

0 comments (0 inline, 0 general)

master/master/config.h

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 /*
  * config.h
+ *
  * Created: 10/25/2012 3:28:22 PM
  *  Author: ethanzonca
  */
 #ifndef CONFIG_H_
 #define CONFIG_H_
 #define F_CPU 11059200
 #define MODULE_ID '1'
 // --------------------------------------------------------------------------
 // AX.25 config (ax25.c)
 // --------------------------------------------------------------------------
 // TX delay in milliseconds
 #define TX_DELAY      300
 // Maximum packet delay
 #define MAX_PACKET_LEN 512  // bytes
 #endif /* CONFIG_H_ */
@@ \ No newline at end of file @@

master/master/lib/afsk.c

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 /*
  * fsk.c
+ *
  * Created: 10/29/2012 7:40:34 PM
  *  Author: ethanzonca
  */
 #define F_CPU 11059200
 #include "../config.h"
 #include <stdint.h>
 #include <stdbool.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <util/delay.h>
 #include <avr/pgmspace.h>
 PROGMEM extern const uint8_t afsk_sine_table[512] = {
 , 129, 130, 132, 133, 135, 136, 138, 139, 141, 143, 144, 146, 147, 149, 150, 152, 153, 155, 156, 158,
 , 161, 163, 164, 166, 167, 168, 170, 171, 173, 174, 176, 177, 179, 180, 182, 183, 184, 186, 187, 188,
 , 191, 193, 194, 195, 197, 198, 199, 200, 202, 203, 204, 205, 207, 208, 209, 210, 211, 213, 214, 215,
 , 217, 218, 219, 220, 221, 223, 224, 225, 226, 227, 228, 228, 229, 230, 231, 232, 233, 234, 235, 236,
 , 237, 238, 239, 239, 240, 241, 242, 242, 243, 244, 244, 245, 245, 246, 247, 247, 248, 248, 249, 249,
 , 250, 250, 251, 251, 251, 252, 252, 252, 253, 253, 253, 253, 254, 254, 254, 254, 254, 254, 254, 254,
 , 254, 255, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 253, 253, 253, 253, 252, 252, 252, 251,
 , 251, 250, 250, 249, 249, 249, 248, 248, 247, 247, 246, 245, 245, 244, 244, 243, 242, 242, 241, 240,
 , 239, 238, 237, 236, 236, 235, 234, 233, 232, 231, 230, 229, 228, 228, 227, 226, 225, 224, 223, 221,
 , 219, 218, 217, 216, 215, 214, 213, 211, 210, 209, 208, 207, 205, 204, 203, 202, 200, 199, 198, 197,
 , 194, 193, 191, 190, 188, 187, 186, 184, 183, 182, 180, 179, 177, 176, 174, 173, 171, 170, 168, 167,
 , 164, 163, 161, 159, 158, 156, 155, 153, 152, 150, 149, 147, 146, 144, 143, 141, 139, 138, 136, 135,
 , 132, 130, 129, 127, 125, 124, 122, 121, 119, 118, 116, 115, 113, 111, 110, 108, 107, 105, 104, 102,
 ,  99,  98,  96,  95,  93,  91,  90,  88,  87,  86,  84,  83,  81,  80,  78,  77,  75,  74,  72,  71,
 ,  68,  67,  66,  64,  63,  61,  60,  59,  57,  56,  55,  54,  52,  51,  50,  49,  47,  46,  45,  44,
 ,  41,  40,  39,  38,  37,  36,  35,  34,  33,  31,  30,  29,  28,  27,  26,  26,  25,  24,  23,  22,
 ,  20,  19,  18,  18,  17,  16,  15,  15,  14,  13,  12,  12,  11,  10,  10,   9,   9,   8,   7,   7,
 ,   6,   5,   5,   5,   4,   4,   3,   3,   3,   2,   2,   2,   1,   1,   1,   1,   0,   0,   0,   0,
 ,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   1,   1,   1,   1,
 ,   2,   2,   3,   3,   3,   4,   4,   5,   5,   5,   6,   6,   7,   7,   8,   9,   9,  10,  10,  11,
 ,  12,  13,  14,  15,  15,  16,  17,  18,  18,  19,  20,  21,  22,  23,  24,  25,  26,  26,  27,  28,
 ,  30,  31,  33,  34,  35,  36,  37,  38,  39,  40,  41,  43,  44,  45,  46,  47,  49,  50,  51,  52,
 ,  55,  56,  57,  59,  60,  61,  63,  64,  66,  67,  68,  70,  71,  72,  74,  75,  77,  78,  80,  81,
 ,  84,  86,  87,  88,  90,  91,  93,  95,  96,  98,  99, 101, 102, 104, 105, 107, 108, 110, 111, 113,
 , 116, 118, 119, 121, 122, 124, 125
 };
 static inline uint8_t afsk_read_sample(int phase)
+{
   return pgm_read_byte_near(afsk_sine_table + phase);
+}
 volatile uint16_t phase = 10;
 volatile uint16_t phasedelta = 3300;
 extern const uint16_t TABLE_SIZE = sizeof(afsk_sine_table);
 // constants
 #define MODEM_CLOCK_RATE F_CPU

master/master/lib/afsk.h

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 /*
  * afsk.h
+ *
  * Created: 10/29/2012 7:43:03 PM
  *  Author: ethanzonca
  */
 #ifndef AFSK_H_
 #define AFSK_H_
 // Private
 void afsk_output_sample(uint8_t s);
 void afsk_timer_stop();
 // Public
 void afsk_setup();
 void afsk_test();
 void afsk_send(const uint8_t *buffer, int len);
 int afsk_busy();
 void afsk_start();
 #endif /* AFSK_H_ */
@@ \ No newline at end of file @@

master/master/lib/ax25.c

➞

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 /*
  * ax25.c
+ *
  * Created: 10/30/2012 12:16:41 PM
  *  Author: ethanzonca
  */
-/*
 #include <inttypes.h>
 #include "../config.h"
 #include "ax25.h"
 #include "afsk.h"
 // Module constants
 #define MAX_PACKET_LEN 512  // bytes
 // Module globals
 static uint16_t crc;
 static uint8_t ones_in_a_row;
 static uint8_t packet[MAX_PACKET_LEN];
 static unsigned int packet_size;
 // Module functions
 void update_crc(uint8_t a_bit)
+{
 	crc ^= a_bit;
 	if (crc & 1)
 	crc = (crc >> 1) ^ 0x8408;  // X-modem CRC poly
 	else
 	crc = crc >> 1;
+}
 void send_byte(uint8_t a_byte)
+{
 	uint8_t i = 0;
 	while (i++ < 8) {
 		uint8_t a_bit = a_byte & 1;
 		a_byte >>= 1;
 		update_crc(a_bit);
 		if (a_bit) {
 			// Next bit is a '1'
 			if (packet_size >= MAX_PACKET_LEN * 8)  // Prevent buffer overrun
 			return;
 			packet[packet_size >> 3] |= (1 << (packet_size & 7));
 			packet_size++;
 			if (++ones_in_a_row < 5) continue;
+		}
 		// Next bit is a '0' or a zero padding after 5 ones in a row
 		if (packet_size >= MAX_PACKET_LEN * 8)    // Prevent buffer overrun
 		return;
 		packet[packet_size >> 3] &= ~(1 << (packet_size & 7));
 		packet_size++;
 		ones_in_a_row = 0;
+	}
+}
 // Exported functions
 void ax25_send_byte(uint8_t a_byte)
+{
 	// Wrap around send_byte, but prints debug info
 	send_byte(a_byte);
+}
 void ax25_send_flag()
@@ @@ -89,49 +88,48 @@ void ax25_send_header(const struct s_add @@
 	crc = 0xffff;
 	// Send flags during TX_DELAY milliseconds (8 bit-flag = 8000/1200 ms)
 	for (i = 0; i < TX_DELAY * 3 / 20; i++) {
 		ax25_send_flag();
+	}
 	for (i = 0; i < num_addresses; i++) {
 		// Transmit callsign
 		for (j = 0; addresses[i].callsign[j]; j++)
 		send_byte(addresses[i].callsign[j] << 1);
 		// Transmit pad
 		for ( ; j < 6; j++)
 		send_byte(' ' << 1);
 		// Transmit SSID. Termination signaled with last bit = 1
 		if (i == num_addresses - 1)
 		send_byte(('0' + addresses[i].ssid) << 1 | 1);
 		else
 		send_byte(('0' + addresses[i].ssid) << 1);
+	}
 	// Control field: 3 = APRS-UI frame
 	send_byte(0x03);
 	// Protocol ID: 0xf0 = no layer 3 data
 	send_byte(0xf0);
+}
 void ax25_send_footer()
+{
 	// Save the crc so that it can be treated it atomically
 	uint16_t final_crc = crc;
 	// Send the CRC
 	send_byte(~(final_crc & 0xff));
 	final_crc >>= 8;
 	send_byte(~(final_crc & 0xff));
 	// Signal the end of frame
 	ax25_send_flag();
+}
 void ax25_flush_frame()
+{
 	// Key the transmitter and send the frame
 	afsk_send(packet, packet_size);
 	afsk_start();
+}
 */
@@ \ No newline at end of file @@

master/master/lib/ax25.h

➞

Show inline comments

 /*
  * ax25.h
+ *
  * Created: 10/30/2012 12:14:05 PM
  *  Author: ethanzonca
  */
 #ifndef AX25_H_
 #define AX25_H_
 struct s_address {
 	char callsign[7];
 	unsigned char ssid;
 };
 void ax25_send_byte(uint8_t a_byte);
 void ax25_send_flag();
 void ax25_send_string(const char *string);
 void ax25_send_header(const struct s_address *addresses, int num_addresses);
 void ax25_send_footer();
 void ax25_flush_frame();
 #endif /* AX25_H_ */
@@ \ No newline at end of file @@

0 comments (0 inline, 0 general)