Description
When creating a new file , need a lot of time for search the FAT for free clusters.
If there are a large number of files in SD card, might lead WDT reset
Trigger WDT timeout at here:
https://github.com/esp8266/Arduino/blob/master/libraries/SD/src/utility/SdVolume.cpp : line 58
// search the FAT for free clusters
for (uint32_t n = 0;; n++, endCluster++) {
// can't find space checked all clusters
if (n >= clusterCount_) return false;
/// if( n %1024 == 0)delay(0); // Add dealy for WDT
// past end - start from beginning of FAT
if (endCluster > fatEnd) {
bgnCluster = endCluster = 2;
}
uint32_t f;
if (!fatGet(endCluster, &f)) return false;
if (f != 0) {
// cluster in use try next cluster as bgnCluster
bgnCluster = endCluster + 1;
} else if ((endCluster - bgnCluster + 1) == count) {
// done - found space
/// Serial.printf("result:%d , %d\n" , n , bgnCluster); // result: 371012 , 371014
break;
}
}It found space at 371012 time.
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