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btstack_tlv_flash_sector: delete old value of newest entry if it exists on start - handles reset after writing entry but before old entry was deleted

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This commit is contained in:
Matthias Ringwald 2017-08-15 11:40:14 +02:00
parent 14f9effccb
commit 944b9f78ad
1 changed files with 26 additions and 25 deletions
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51
platform/embedded/btstack_tlv_flash_sector.c
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@ -198,6 +198,20 @@ static int btstack_tlv_flash_sector_verify_alignment(btstack_tlv_flash_sector_t
return 1;
}
static void btstack_tlv_flash_sector_delete_tag_until_offset(btstack_tlv_flash_sector_t * self, uint32_t tag, uint32_t offset){
tlv_iterator_t it;
btstack_tlv_flash_sector_iterator_init(self, &it, self->current_bank);
while (btstack_tlv_flash_sector_iterator_has_next(self, &it) && it.offset < offset){
if (it.tag == tag){
log_info("Erase tag '%x' at position %u", tag, it.offset);
// overwrite tag with invalid tag
uint32_t zero_tag = 0;
self->hal_flash_sector_impl->write(self->hal_flash_sector_context, self->current_bank, it.offset, (uint8_t*) &zero_tag, sizeof(zero_tag));
}
tlv_iterator_fetch_next(self, &it);
}
}
/**
* Get Value for Tag
* @param tag
@ -261,17 +275,7 @@ static void btstack_tlv_flash_sector_store_tag(void * context, uint32_t tag, con
self->hal_flash_sector_impl->write(self->hal_flash_sector_context, self->current_bank, self->write_offset, entry, sizeof(entry));
// overwrite old entries (if exists)
tlv_iterator_t it;
btstack_tlv_flash_sector_iterator_init(self, &it, self->current_bank);
while (btstack_tlv_flash_sector_iterator_has_next(self, &it) && it.offset < self->write_offset){
if (it.tag == tag){
log_info("Erase old tag '%x' at position %u", tag, it.offset);
// overwrite tag with invalid tag
uint32_t zero_tag = 0;
self->hal_flash_sector_impl->write(self->hal_flash_sector_context, self->current_bank, it.offset, (uint8_t*) &zero_tag, sizeof(zero_tag));
}
tlv_iterator_fetch_next(self, &it);
}
btstack_tlv_flash_sector_delete_tag_until_offset(self, tag, self->write_offset);
// done
self->write_offset += sizeof(entry) + data_size;
@ -282,20 +286,8 @@ static void btstack_tlv_flash_sector_store_tag(void * context, uint32_t tag, con
* @param tag
*/
static void btstack_tlv_flash_sector_delete_tag(void * context, uint32_t tag){
btstack_tlv_flash_sector_t * self = (btstack_tlv_flash_sector_t *) context;
tlv_iterator_t it;
btstack_tlv_flash_sector_iterator_init(self, &it, self->current_bank);
while (btstack_tlv_flash_sector_iterator_has_next(self, &it)){
if (it.tag == tag){
log_info("Erase tag '%x' at position %u", tag, it.offset);
// overwrite tag with invalid tag
uint32_t zero_tag = 0;
self->hal_flash_sector_impl->write(self->hal_flash_sector_context, self->current_bank, it.offset, (uint8_t*) &zero_tag, sizeof(zero_tag));
}
tlv_iterator_fetch_next(self, &it);
}
btstack_tlv_flash_sector_delete_tag_until_offset(self, tag, self->write_offset);
}
static const btstack_tlv_t btstack_tlv_flash_sector = {
@ -322,15 +314,24 @@ const btstack_tlv_t * btstack_tlv_flash_sector_init_instance(btstack_tlv_flash_s
}
self->current_bank = current_bank;
// find write offset
// find last entry and write offset
tlv_iterator_t it;
uint32_t last_tag = 0;
uint32_t last_offset = 0;
btstack_tlv_flash_sector_iterator_init(self, &it, self->current_bank);
while (btstack_tlv_flash_sector_iterator_has_next(self, &it)){
last_tag = it.tag;
last_offset = it.offset;
tlv_iterator_fetch_next(self, &it);
}
self->write_offset = it.offset;
log_info("write offset %u", self->write_offset);
// delete older instances of last_tag
// this handles the unlikely case where MCU did reset after new value + header was written but before delete did complete
if (last_tag){
btstack_tlv_flash_sector_delete_tag_until_offset(self, last_tag, last_offset);
}
return &btstack_tlv_flash_sector;
}