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btstack_tlv_flash_sector: only erase bank if not empty

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This commit is contained in:
Matthias Ringwald 2017-08-14 17:06:20 +02:00
parent bdecf965b4
commit d961a09078
1 changed files with 32 additions and 4 deletions
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36
platform/embedded/btstack_tlv_flash_sector.c
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@ -116,12 +116,41 @@ static void btstack_tlv_flash_sector_write_header(btstack_tlv_flash_sector_t * s
self->hal_flash_sector_impl->write(self->hal_flash_sector_context, bank, 0, header, BTSTACK_TLV_HEADER_LEN);
}
/**
* @brief Check if erased
*/
static int btstack_tlv_flash_sector_test_erased(btstack_tlv_flash_sector_t * self, int bank){
uint32_t offset;
uint32_t size = self->hal_flash_sector_impl->get_size(self->hal_flash_sector_context);
uint8_t buffer[16];
uint8_t empty16[16];
memset(empty16, 0xff, sizeof(empty16));
for (offset = 0 ; offset <= size ; offset += sizeof(empty16)){
uint32_t copy_size = (offset + sizeof(empty16) < size) ? sizeof(empty16) : (size - offset);
self->hal_flash_sector_impl->read(self->hal_flash_sector_context, bank, offset, buffer, copy_size);
if (memcmp(buffer, empty16, sizeof(empty16))) return 0;
}
return 1;
}
/**
* @brief erase bank (only if not already erased)
*/
static void btstack_tlv_flash_sector_erase_bank(btstack_tlv_flash_sector_t * self, int bank){
if (btstack_tlv_flash_sector_test_erased(self, 0)){
log_info("bank %u already erased", bank);
} else {
log_info("bank %u not empty, erase bank", bank);
self->hal_flash_sector_impl->erase(self->hal_flash_sector_context, 0);
}
}
static void btstack_tlv_flash_sector_migrate(btstack_tlv_flash_sector_t * self){
int next_bank = 1 - self->current_bank;
// @TODO erase might not be needed - resp. already been performed
self->hal_flash_sector_impl->erase(self->hal_flash_sector_context, next_bank);
// erase bank (if needed)
btstack_tlv_flash_sector_erase_bank(self, next_bank);
int next_write_pos = 8;
tlv_iterator_t it;
@ -266,8 +295,7 @@ const btstack_tlv_t * btstack_tlv_flash_sector_init_instance(btstack_tlv_flash_s
int current_bank = btstack_tlv_flash_sector_get_latest_bank(self);
log_info("found bank %d", current_bank);
if (current_bank < 0){
log_info("erase first bank");
hal_flash_sector_impl->erase(hal_flash_sector_context, 0);
btstack_tlv_flash_sector_erase_bank(self, 0);
current_bank = 0;
btstack_tlv_flash_sector_write_header(self, current_bank, 0); // epoch = 0;
}