sys/config: Make floating point support optional

Adding CONF_FLOAT support could increase code size significantly
if floating point are not used otherwise.

This makes float support optional (enabled by default when HARDFLOAT is present).

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>

sys/config/src/config.c

@@ -156,7 +156,9 @@ conf_value_from_str(char *val_str, enum conf_type type, void *vp, int maxlen)
 {
  int64_t val;
  uint64_t uval;
+#if MYNEWT_VAL(CONFIG_FLOAT_SUPPORT)
  float fval;
+#endif
  char *eptr;
 
  if (!val_str) {
@@ -223,13 +225,15 @@ conf_value_from_str(char *val_str, enum conf_type type, void *vp, int maxlen)
  *(uint64_t *)vp = uval;
  }
  break;
+#if MYNEWT_VAL(CONFIG_FLOAT_SUPPORT)
  case CONF_FLOAT:
  fval = strtof(val_str, &eptr);
  if (*eptr != '\0') {
  goto err;
  }
  *(float *)vp = fval;
  break;
+#endif
  case CONF_STRING:
  val = strlen(val_str);
  if (val + 1 > maxlen) {

sys/config/syscfg.yml

@@ -93,6 +93,15 @@ syscfg.defs:
  description: >
  Max length of a value stored in the config FCB.
  value: 256
+ CONFIG_FLOAT_SUPPORT:
+ description: >
+ Enable float support in config.
+ For MCU without hardware support for enabling this if no other
+ function use floating point may increase image size 20kB or more.
+ value: 0
+
+syscfg.vals.HARDFLOAT:
+ value: 1
 
 syscfg.defs.(CONFIG_FCB || CONFIG_FCB2):
  CONFIG_FCB_FLASH_AREA: