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AP_Param: avoid saving values within 0.01% of the default value

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this saves some more space due to rounding errors
This commit is contained in:
Andrew Tridgell 2012-08-08 13:13:30 +10:00
parent 3159c9ed99
commit fc26d49260
1 changed files with 17 additions and 3 deletions
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20
libraries/AP_Common/AP_Param.cpp
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@ -626,9 +626,23 @@ bool AP_Param::save(void)
}
// if the value is the default value then don't save
if (phdr.type <= AP_PARAM_FLOAT &&
cast_to_float((enum ap_var_type)phdr.type) == PGM_FLOAT(&info->def_value)) {
return true;
if (phdr.type <= AP_PARAM_FLOAT) {
float v1 = cast_to_float((enum ap_var_type)phdr.type);
float v2;
if (ginfo != NULL) {
v2 = PGM_FLOAT(&ginfo->def_value);
} else {
v2 = PGM_FLOAT(&info->def_value);
}
if (v1 == v2) {
return true;
}
if (phdr.type != AP_PARAM_INT32 &&
(fabs(v1-v2) < 0.0001*fabs(v1))) {
// for other than 32 bit integers, we accept values within
// 0.01 percent of the current value as being the same
return true;
}
}
if (ofs+type_size((enum ap_var_type)phdr.type)+2*sizeof(phdr) >= _eeprom_size) {