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AP_Param: added find_by_index()

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This commit is contained in:
Andrew Tridgell 2012-09-20 07:42:35 +10:00
parent 3077de0d33
commit e761645e24
2 changed files with 25 additions and 0 deletions
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16
libraries/AP_Common/AP_Param.cpp
View File

@ -579,6 +579,22 @@ AP_Param::find(const char *name, enum ap_var_type *ptype)
return NULL;
}
// Find a variable by index. Note that this is quite slow.
//
AP_Param *
AP_Param::find_by_index(uint16_t idx, enum ap_var_type *ptype)
{
ParamToken token;
AP_Param *ap;
uint16_t count=0;
for (ap=AP_Param::first(&token, ptype);
ap && count < idx;
ap=AP_Param::next_scalar(&token, ptype)) {
count++;
}
return ap;
}
// Save the variable to EEPROM, if supported
//
bool AP_Param::save(void)

9
libraries/AP_Common/AP_Param.h
View File

@ -132,6 +132,15 @@ public:
///
static AP_Param * find(const char *name, enum ap_var_type *ptype);
/// Find a variable by index.
///
///
/// @param idx The index of the variable
/// @return A pointer to the variable, or NULL if
/// it does not exist.
///
static AP_Param * find_by_index(uint16_t idx, enum ap_var_type *ptype);
/// Save the current value of the variable to EEPROM.
///
/// @return True if the variable was saved successfully.