Add ability to specify the state of the power and reset pins on

program exit.  Default to leaving the pins in the state they were when
we found them.

Contributed by: Joerg Wunsch


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@37 81a1dc3b-b13d-400b-aceb-764788c761c2

avrprog.c

@@ -237,6 +237,10 @@ char * usage_text =
 "\n"
 "    -t            : enter terminal mode (or read commands from stdin)\n"
 "\n"
+"    -E exitspec[,...]: specify which bits to set/reset on exit\n"
+"                     \"[no]reset\" = [don't] activate /RESET\n"
+"                     \"[no]vcc\"   = [don't] activate Vcc\n"
+"\n"
 "    -e            : perform a chip erase (required before programming)\n"
 "\n";
 
@@ -383,7 +387,6 @@ int ppi_get ( int fd, int reg, int bit )
   return (v == bit);
 }
 
-
 /*
  * toggle the indicated bit of the specified register.
  */
@@ -405,6 +408,43 @@ int ppi_toggle ( int fd, int reg, int bit )
 }
 
 
+/*
+ * get all bits of the specified register.
+ */
+int ppi_getall ( int fd, int reg )
+{
+  unsigned char v;
+  unsigned long get, set;
+  int rc;
+
+  rc = ppi_getops ( reg, &get, &set );
+  if (rc)
+    return -1;
+
+  ioctl(fd, get, &v);
+
+  return (int)v;
+}
+
+/*
+ * set all bits of the specified register to val.
+ */
+int ppi_setall ( int fd, int reg, int val )
+{
+  unsigned char v;
+  unsigned long get, set;
+  int rc;
+
+  rc = ppi_getops ( reg, &get, &set );
+  if (rc)
+    return -1;
+
+  v = val;
+  ioctl(fd, set, &v);
+
+  return 0;
+}
+
 /*
  * pulse the indicated bit of the specified register.
  */
@@ -1816,6 +1856,8 @@ int go_interactive ( int fd, struct avrpart * p )
   rc = 0;
   while ((cmdbuf = readline("avrprog> ")) != NULL) {
     len = strlen(cmdbuf);
+    if (len > 1)
+      add_history(cmdbuf);
 
     /* 
      * find the start of the command, skipping any white space
@@ -1930,6 +1972,26 @@ void display_part ( FILE * f, struct avrpart * p, char * prefix )
           prefix, p->e_readback[0], p->e_readback[1]);
 }
 
+/*
+ * parse the -E string
+ */
+int getexitspecs ( char *s, int *set, int *clr )
+{
+  char *cp;
+
+  while ((cp = strtok(s, ","))) {
+    if (strcmp(cp, "reset") == 0) { *clr |= AVR_RESET; }
+    else if (strcmp(cp, "noreset") == 0) { *set |= AVR_RESET; }
+    else if (strcmp(cp, "vcc") == 0) { *set |= AVR_POWER; }
+    else if (strcmp(cp, "novcc") == 0) { *clr |= AVR_POWER; }
+    else
+      return -1;
+    s = 0; /* strtok() should be called with the actual string only once */
+  }
+
+  return 0;
+}
+
 /*
  * main routine
  */
@@ -1949,6 +2011,7 @@ int main ( int argc, char * argv [] )
   struct avrpart * p, ap1;      /* which avr part we are programming */
   struct avrpart * v, ap2;     /* used for verify */
   int              readorwrite; /* true if a chip read/write op was selected */
+  int              ppidata;	/* cached value of the ppi data register */
 
   /* options / operating mode variables */
   int     memtype;     /* AVR_FLASH or AVR_EEPROM */
@@ -1962,6 +2025,8 @@ int main ( int argc, char * argv [] )
   FILEFMT filefmt;     /* FMT_AUTO, FMT_IHEX, FMT_SREC, FMT_RBIN */
   int     nowrite;     /* don't actually write anything to the chip */
   int     verify;      /* perform a verify operation */
+  int     ppisetbits;  /* bits to set in ppi data register at exit */
+  int     ppiclrbits;  /* bits to clear in ppi data register at exit */
 
   readorwrite = 0;
   parallel    = DEFAULT_PARALLEL;
@@ -1976,6 +2041,7 @@ int main ( int argc, char * argv [] )
   filefmt     = FMT_AUTO;
   nowrite     = 0;
   verify      = 1;        /* on by default; XXX can't turn it off */
+  ppisetbits  = ppiclrbits = 0;
 
   progname = rindex(argv[0],'/');
   if (progname)
@@ -2023,7 +2089,7 @@ int main ( int argc, char * argv [] )
   /*
    * process command line arguments
    */
-  while ((ch = getopt(argc,argv,"?ef:Fi:m:no:p:P:tv")) != -1) {
+  while ((ch = getopt(argc,argv,"?eE:f:Fi:m:no:p:P:tv")) != -1) {
 
     switch (ch) {
       case 'm': /* select memory type to operate on */
@@ -2084,6 +2150,13 @@ int main ( int argc, char * argv [] )
         erase = 1;
         break;
 
+      case 'E':
+	if (getexitspecs(optarg, &ppisetbits, &ppiclrbits) < 0) {
+	  usage();
+	  exit(1);
+	}
+	break;
+
       case 'i': /* specify input file */
         if (outputf || terminal) {
           fprintf(stderr,"%s: -o, -i, and -t are incompatible\n\n", progname);
@@ -2191,6 +2264,15 @@ int main ( int argc, char * argv [] )
 
   exitrc = 0;
 
+  ppidata = ppi_getall(fd, PPIDATA);
+  if (ppidata < 0) {
+    fprintf ( stderr, "%s: error reading status of ppi data port\n", progname);
+    exitrc = 1;
+    ppidata = 0; /* clear all bits at exit */
+    goto main_exit;
+  }
+  ppidata &= ~ppiclrbits;
+  ppidata |= ppisetbits;
 
   /*
    * initialize the chip in preperation for accepting commands
@@ -2368,8 +2450,7 @@ int main ( int argc, char * argv [] )
    */
 
   avr_powerdown(fd);
-  ppi_clr(fd, PPIDATA, 0xff);
+  ppi_setall(fd, PPIDATA, ppidata);
-  ppi_clr(fd, PPIDATA, AVR_RESET);
 
   close(fd);