Mercurial > ~darius > hgwebdir.cgi > avr

changeset 21:e82d15fa9a1a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Re-format the code.
author darius
date Mon, 12 Dec 2005 23:01:00 +1030
parents 59c7fcf10ea0
children bd792ebf813d
files 1wire.c
diffstat 1 files changed, 115 insertions(+), 114 deletions(-) [+]
line wrap: on
line diff
--- a/1wire.c	Mon Dec 12 22:57:46 2005 +1030
+++ b/1wire.c	Mon Dec 12 23:01:00 2005 +1030
@@ -33,7 +33,7 @@
 #include <stdio.h>
 #include <avr/io.h>
 #include <avr/pgmspace.h>
-
+#include <util/delay.h>
 #include "1wire.h"
 #include "1wire-delay.h"
 
@@ -41,7 +41,7 @@
 void		uart_putsP(const char *addr);
 void		uart_puts(const char *addr);
 void		uart_getc();
-int		uart_putc(char c);
+char		uart_putc(char c);
 #endif
 
 static uint8_t OW_LastDevice = 0;
@@ -56,6 +56,7 @@
 /*-----------------------------------------------------------------------------
  * Generate a 1-Wire reset, return 0 if presence pulse was found,
  * return 1 otherwise.
+ * 
  * (NOTE: Does not handle alarm presence from DS2404/DS1994)
  */
 uint8_t
@@ -221,147 +222,147 @@
     int8_t	next_result;
 
     /* Init for search */
-   bit_number = 1;
-   last_zero = 0;
-   rom_byte_number = 0;
-   rom_byte_mask = 1;
-   next_result = OW_NOMODULES;
-   lastcrc8 = 0;
-   crcaccum = 0;
+    bit_number = 1;
+    last_zero = 0;
+    rom_byte_number = 0;
+    rom_byte_mask = 1;
+    next_result = OW_NOMODULES;
+    lastcrc8 = 0;
+    crcaccum = 0;
 
-   /* if the last call was not the last one */
-   if (!OW_LastDevice) {
-       /* check if reset first is requested */
-       if (do_reset) {
-	   /* reset the 1-wire
-	    * if there are no parts on 1-wire, return 0 */
+    /* if the last call was not the last one */
+    if (!OW_LastDevice) {
+	/* check if reset first is requested */
+	if (do_reset) {
+	    /* reset the 1-wire
+	     * if there are no parts on 1-wire, return 0 */
 #if OW_DEBUG
-	   uart_putsP(PSTR("Resetting\n\r"));
+	    uart_putsP(PSTR("Resetting\n\r"));
 #endif
-         if (OWTouchReset()) {
-	     /* reset the search */
-	     OW_LastDiscrepancy = 0;
-	     OW_LastFamilyDiscrepancy = 0;
+	    if (OWTouchReset()) {
+		/* reset the search */
+		OW_LastDiscrepancy = 0;
+		OW_LastFamilyDiscrepancy = 0;
 #if OW_DEBUG
-	     uart_putsP(PSTR("No devices on bus\n\r"));
+		uart_putsP(PSTR("No devices on bus\n\r"));
 #endif
-	     return OW_NOPRESENCE;
-         }
-       }
+		return OW_NOPRESENCE;
+	    }
+	}
 
-       /* If finding alarming devices issue a different command */
-      if (alarm_only)
-	  OWWriteByte(OW_SEARCH_ALRM_CMD);	/* issue the alarming search command */
-      else
-	  OWWriteByte(OW_SEARCH_ROM_CMD);	/* issue the search command */
+	/* If finding alarming devices issue a different command */
+	if (alarm_only)
+	    OWWriteByte(OW_SEARCH_ALRM_CMD);	/* issue the alarming search command */
+	else
+	    OWWriteByte(OW_SEARCH_ROM_CMD);	/* issue the search command */
 
-      /* pause before beginning the search */
-      OWdelay();
-      OWdelay();
-      OWdelay();
+	/* pause before beginning the search */
+	OWdelay();
+	OWdelay();
+	OWdelay();
       
-      /* loop to do the search */
-      do {
-	  /* read a bit and its compliment */
-	  bit_test = OWReadBit() << 1;
-	  bit_test |= OWReadBit();
+	/* loop to do the search */
+	do {
+	    /* read a bit and its compliment */
+	    bit_test = OWReadBit() << 1;
+	    bit_test |= OWReadBit();
 
 #if OW_DEBUG
-	  sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
-	  uart_puts(errstr);
+	    sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
+	    uart_puts(errstr);
 #endif
 
-	  /* check for no devices on 1-wire */
-	  if (bit_test == 3) {
+	    /* check for no devices on 1-wire */
+	    if (bit_test == 3) {
 #if OW_DEBUG
-	      sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
-	      uart_puts(errstr);
+		sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
+		uart_puts(errstr);
 #endif
-	      return(OW_BADWIRE);
-	  }
-	  else {
-	      /* all devices coupled have 0 or 1 */
-	      if (bit_test > 0)
-		  search_direction = !(bit_test & 0x01);  /* bit write value for search */
-	      else {
-		  /* if this discrepancy is before the Last Discrepancy
-		   * on a previous OWNext then pick the same as last time */
-		  if (bit_number < OW_LastDiscrepancy)
-		      search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
-		  else
-		      /* if equal to last pick 1, if not then pick 0 */
-			 search_direction = (bit_number == OW_LastDiscrepancy);
+		return(OW_BADWIRE);
+	    }
+	    else {
+		/* all devices coupled have 0 or 1 */
+		if (bit_test > 0)
+		    search_direction = !(bit_test & 0x01);  /* bit write value for search */
+		else {
+		    /* if this discrepancy is before the Last Discrepancy
+		     * on a previous OWNext then pick the same as last time */
+		    if (bit_number < OW_LastDiscrepancy)
+			search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
+		    else
+			/* if equal to last pick 1, if not then pick 0 */
+			search_direction = (bit_number == OW_LastDiscrepancy);
 
-		  /* if 0 was picked then record its position in LastZero */
-		  if (search_direction == 0) {
-		      last_zero = bit_number;
+		    /* if 0 was picked then record its position in LastZero */
+		    if (search_direction == 0) {
+			last_zero = bit_number;
 
-		      /* check for Last discrepancy in family */
-		      if (last_zero < 9)
-			  OW_LastFamilyDiscrepancy = last_zero;
-		  }
-	      }
+			/* check for Last discrepancy in family */
+			if (last_zero < 9)
+			    OW_LastFamilyDiscrepancy = last_zero;
+		    }
+		}
 
-	      /* set or clear the bit in the ROM byte rom_byte_number
-	       * with mask rom_byte_mask */
-	      if (search_direction == 1)
-		  ROM[rom_byte_number] |= rom_byte_mask;
-	      else
-		  ROM[rom_byte_number] &= ~rom_byte_mask;
+		/* set or clear the bit in the ROM byte rom_byte_number
+		 * with mask rom_byte_mask */
+		if (search_direction == 1)
+		    ROM[rom_byte_number] |= rom_byte_mask;
+		else
+		    ROM[rom_byte_number] &= ~rom_byte_mask;
 
-	      /* serial number search direction write bit */
-	      OWWriteBit(search_direction);
+		/* serial number search direction write bit */
+		OWWriteBit(search_direction);
 
-	      /* increment the byte counter bit_number
-	       * and shift the mask rom_byte_mask */
-	      bit_number++;
-	      rom_byte_mask <<= 1;
+		/* increment the byte counter bit_number
+		 * and shift the mask rom_byte_mask */
+		bit_number++;
+		rom_byte_mask <<= 1;
 
-	      /* if the mask is 0 then go to new ROM byte rom_byte_number
-	       * and reset mask */
-	      if (rom_byte_mask == 0) {
-		  OWCRC(ROM[rom_byte_number], &crcaccum);  /* accumulate the CRC */
-		  lastcrc8 = crcaccum;
+		/* if the mask is 0 then go to new ROM byte rom_byte_number
+		 * and reset mask */
+		if (rom_byte_mask == 0) {
+		    OWCRC(ROM[rom_byte_number], &crcaccum);  /* accumulate the CRC */
+		    lastcrc8 = crcaccum;
 		  
-		  rom_byte_number++;
-		  rom_byte_mask = 1;
-	      }
-	  }
-      } while (rom_byte_number < 8);  /* loop until through all ROM bytes 0-7 */
+		    rom_byte_number++;
+		    rom_byte_mask = 1;
+		}
+	    }
+	} while (rom_byte_number < 8);  /* loop until through all ROM bytes 0-7 */
 
-      /* if the search was successful then */
-      if (!(bit_number < 65) || lastcrc8) {
-	  if (lastcrc8) {
+	/* if the search was successful then */
+	if (!(bit_number < 65) || lastcrc8) {
+	    if (lastcrc8) {
 #if OW_DEBUG
-	      sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8);
-	      uart_puts(errstr);
+		sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8);
+		uart_puts(errstr);
 #endif
-	      next_result = OW_BADCRC;
-	  } else {
-	      /*  search successful so set LastDiscrepancy,LastDevice,next_result */
-	      OW_LastDiscrepancy = last_zero;
-	      OW_LastDevice = (OW_LastDiscrepancy == 0);
+		next_result = OW_BADCRC;
+	    } else {
+		/*  search successful so set LastDiscrepancy,LastDevice,next_result */
+		OW_LastDiscrepancy = last_zero;
+		OW_LastDevice = (OW_LastDiscrepancy == 0);
 #if OW_DEBUG
-	      sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice);
-	      uart_puts(errstr);
+		sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice);
+		uart_puts(errstr);
 #endif
-	      next_result = OW_FOUND;
-	  }
-      }
-   }
+		next_result = OW_FOUND;
+	    }
+	}
+    }
 
-   /* if no device found then reset counters so next 'next' will be
-    * like a first */
-   if (next_result != OW_FOUND || ROM[0] == 0) {
-       OW_LastDiscrepancy = 0;
-       OW_LastDevice = 0;
-       OW_LastFamilyDiscrepancy = 0;
-   }
+    /* if no device found then reset counters so next 'next' will be
+     * like a first */
+    if (next_result != OW_FOUND || ROM[0] == 0) {
+	OW_LastDiscrepancy = 0;
+	OW_LastDevice = 0;
+	OW_LastFamilyDiscrepancy = 0;
+    }
 
-   if (next_result == OW_FOUND && ROM[0] == 0x00)
-       next_result = OW_BADWIRE;
+    if (next_result == OW_FOUND && ROM[0] == 0x00)
+	next_result = OW_BADWIRE;
    
-   return next_result;
+    return next_result;
 
 }