5a23ec4dc4
This change adds a check for the free page count to nvs_flash_init. Under normal operation, NVS keeps at least one free page available, except for transient states such as freeing up new page. Due to external factors (such as NVS partition size reduction) this free page could be lost, making NVS operation impossible. Previously this would cause an error when performing any nvs_set operation or opening a new namespace. With this change, an error is returned from nvs_flash_init to indicate that NVS partition is in such a state.
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef nvs_flash_h
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#define nvs_flash_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Initialize NVS flash storage with layout given in the partition table.
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*
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* @return
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* - ESP_OK if storage was successfully initialized.
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* - ESP_ERR_NVS_NO_FREE_PAGES if the NVS storage contains no empty pages
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* (which may happen if NVS partition was truncated)
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* - one of the error codes from the underlying flash storage driver
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*/
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esp_err_t nvs_flash_init(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* nvs_flash_h */
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