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refactor ESP_getMaxAllocHeap()

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This commit is contained in:
Theo Arends 2020-08-12 12:11:47 +02:00
parent 9f1da8489e
commit 31660da843
1 changed files with 24 additions and 2 deletions
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26
tasmota/support_esp32.ino
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@ -48,7 +48,26 @@ uint32_t ESP_getFreeHeap(void) {
}
uint32_t ESP_getMaxAllocHeap(void) {
return ESP.getMaxFreeBlockSize();
/*
From libraries.rst
ESP.getMaxFreeBlockSize() returns the largest contiguous free RAM block in
the heap, useful for checking heap fragmentation. **NOTE:** Maximum
``malloc()``able block will be smaller due to memory manager overheads.
From HeapMetric.ino
ESP.getMaxFreeBlockSize() does not indicate the amount of memory that is
available for use in a single malloc call. It indicates the size of a
contiguous block of (raw) memory before the umm_malloc overhead is removed.
It should also be pointed out that, if you allow for the needed overhead in
your malloc call, it could still fail in the general case. An IRQ handler
could have allocated memory between the time you call
ESP.getMaxFreeBlockSize() and your malloc call, reducing the available
memory.
*/
uint32_t free_block_size = ESP.getMaxFreeBlockSize();
if (free_block_size > 100) { free_block_size -= 100; }
return free_block_size;
}
void ESP_Restart(void) {
@ -273,7 +292,10 @@ uint32_t ESP_getFreeHeap(void) {
}
uint32_t ESP_getMaxAllocHeap(void) {
return ESP.getMaxAllocHeap();
// largest block of heap that can be allocated at once
uint32_t free_block_size = ESP.getMaxAllocHeap();
if (free_block_size > 100) { free_block_size -= 100; }
return free_block_size;
}
void ESP_Restart(void) {