65  * digits. The burst data consist of five characters (ten hex digits)
79  * burst synchronization. These digits are then repeated with the same
98  * By design, the last stop bit of the last character in the burst
111  * the driver produces one line for each burst in two formats
120  * where n is the number of characters in the burst (0-10), b the burst
122  * synchronization distance (0-16), m the burst number (2-9) and code
123  * the burst characters as received. Note that the hex digits in each
124  * character are reversed, so the burst
128  * is interpreted as containing 10 characters with burst distance 38,
129  * field alignment 0, synchronization distance 16 and burst number 9.
137  * where n is the number of characters in the burst (0-10), b the burst
139  * burst characters as received. Note that the hex digits in each
140  * character are reversed and the last ten digits inverted, so the burst
144  * is interpreted as containing 10 characters with burst distance 40.
155  * written to the clockstats file and debug score after the last burst
246 #define BURST		11	/* max characters per burst */  macro
247 #define MINCHARS		9	/* min characters per burst */
248 #define MINDIST		28	/* min burst distance (of 40)  */
272 #define RUNT		0x0001	/* runt burst */
273 #define NOISE		0x0002	/* noise burst */
289  * burst was received. SYNERR is raised if the AFRAME or BFRAME status
331 	l_fp	cstamp[BURST];	/* character timestamps */
348 	 * Character burst variables
350 	int	cbuf[BURST];	/* character buffer */
353 	int	prevsec;	/* previous burst second */
354 	int	burdist;	/* burst distance */
882 		 * phase of the entire burst from the phase of the first  in chu_rf()
1002 	 * longest burst, process the last burst and start a new one. If  in chu_decode()
1004 	 * characters, consider this a noise burst and reject it.  in chu_decode()
1012 	if (dtemp > BURST * CHAR) {  in chu_decode()
1020 	 * Append the character to the current burst and append the  in chu_decode()
1023 	if (up->ndx < BURST) {  in chu_decode()
1033  * chu_burst - search for valid burst format
1050 	 * five characters. The burst distance is defined as the number  in chu_burst()
1063 	 * If the burst distance is at least MINDIST, this must be a  in chu_burst()
1064 	 * format A burst; if the value is not greater than -MINDIST, it  in chu_burst()
1065 	 * must be a format B burst. If the B burst is perfect, we  in chu_burst()
1066 	 * believe it; otherwise, it is a noise burst and of no use to  in chu_burst()
1079 	 * If this is a valid burst, wait a guard time of ten seconds to  in chu_burst()
1090  * chu_b - decode format B burst
1112 	 * In a format B burst, a character is considered valid only if  in chu_b()
1113 	 * the first occurence matches the last occurence. The burst is  in chu_b()
1144 	 * Convert the burst data to internal format. Don't bother with  in chu_b()
1164  * chu_a - decode format A burst
1188 	 * Determine correct burst phase. There are three cases  in chu_a()
1193 	 * relative to the framing digits is maximum. The burst is valid  in chu_a()
1249 	 * A valid burst requires the first seconds number to match the  in chu_a()
1250 	 * last seconds number. If so, the burst timestamps are  in chu_a()
1253 	 * the previous burst to the current one.  in chu_a()
1340 	 * accumulated burst data. We do a bit of fancy footwork so that  in chu_second()
1341 	 * this doesn't run while burst data are being accumulated.  in chu_second()
1348 	 * Process the last burst, if still in the burst buffer.  in chu_second()
1446 	 * Majority decoder. Each burst encodes two replications at each  in chu_major()
1478 	 * minutes and the minute offset computed from the burst  in chu_major()