143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
#include <device.h>
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#include <drivers/flash.h>
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#include <fs/nvs.h>
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#include <power/reboot.h>
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#include <storage/flash_map.h>
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#include <string.h>
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#include <zephyr.h>
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#include "ens_fs.h"
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#include "sequencenumber.h"
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#include "storage.h"
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// Maybe use this as param for init function
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#define SEC_COUNT 8U
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#define STORED_CONTACTS_INFO_ID 0
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#define MAX_CONTACTS 65536
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static struct nvs_fs info_fs;
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// Information about currently stored contacts
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static stored_contacts_information_t contact_information = {.oldest_contact = 0, .count = 0};
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inline storage_id_t convert_sn_to_storage_id(record_sequence_number_t sn) {
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return (storage_id_t)(sn % MAX_CONTACTS);
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}
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/**
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* Load our initial storage information from flash.
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*/
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int load_storage_information() {
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size_t size = sizeof(contact_information);
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int rc = nvs_read(&info_fs, STORED_CONTACTS_INFO_ID, &contact_information, size);
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// Check, if read what we wanted
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if (rc != size) {
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// Write our initial data to storage
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rc = nvs_write(&info_fs, STORED_CONTACTS_INFO_ID, &contact_information, size);
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if (rc <= 0) {
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return rc;
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}
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}
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return 0;
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}
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/**
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* Save our current storage infromation to flash.
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*/
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int save_storage_information() {
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int rc = nvs_write(&info_fs, STORED_CONTACTS_INFO_ID, &contact_information, sizeof(contact_information));
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if (rc <= 0) {
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printk("Something went wrong after saving storage information.\n");
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}
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return rc;
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}
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record_sequence_number_t get_next_sequence_number() {
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if (contact_information.count >= MAX_CONTACTS) {
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contact_information.oldest_contact = sn_increment(contact_information.oldest_contact);
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} else {
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contact_information.count++;
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}
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save_storage_information();
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return get_latest_sequence_number();
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}
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int init_contact_storage(void) {
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int rc = 0;
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struct flash_pages_info info;
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// define the nvs file system
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info_fs.offset = FLASH_AREA_OFFSET(storage);
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rc = flash_get_page_info_by_offs(device_get_binding(DT_CHOSEN_ZEPHYR_FLASH_CONTROLLER_LABEL), info_fs.offset, &info);
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if (rc) {
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// Error during retrieval of page information
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return rc;
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}
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info_fs.sector_size = info.size;
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info_fs.sector_count = SEC_COUNT;
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rc = nvs_init(&info_fs, DT_CHOSEN_ZEPHYR_FLASH_CONTROLLER_LABEL);
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if (rc) {
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// Error during nvs_init
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return rc;
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}
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// Load the current storage information
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rc = load_storage_information();
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printk("Currently %d contacts stored!\n", contact_information.count);
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printk("Space available: %d\n", FLASH_AREA_SIZE(storage));
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return rc;
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}
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int load_contact(contact_t* dest, record_sequence_number_t sn) {
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storage_id_t id = convert_sn_to_storage_id(sn);
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int rc = nvs_read(&info_fs, id, dest, sizeof(*dest));
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if (rc <= 0) {
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return rc;
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}
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return 0;
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}
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int add_contact(contact_t* src) {
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record_sequence_number_t curr_sn = get_next_sequence_number();
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storage_id_t id = convert_sn_to_storage_id(curr_sn);
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int rc = nvs_write(&info_fs, id, src, sizeof(*src));
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if (rc > 0) {
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return 0;
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}
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return rc;
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}
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// TODO handle start and end
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int delete_contact(record_sequence_number_t sn) {
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storage_id_t id = convert_sn_to_storage_id(sn);
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int rc = nvs_delete(&info_fs, id);
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if (!rc) {
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if (sn_equal(sn, get_latest_sequence_number())) {
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contact_information.count--;
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} else if (sn_equal(sn, get_oldest_sequence_number())) {
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contact_information.oldest_contact = sn_increment(contact_information.oldest_contact);
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contact_information.count--;
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}
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save_storage_information();
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}
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return rc;
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}
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record_sequence_number_t get_latest_sequence_number() {
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return sn_mask(contact_information.oldest_contact + contact_information.count);
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}
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record_sequence_number_t get_oldest_sequence_number() {
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return contact_information.oldest_contact;
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}
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uint32_t get_num_contacts() {
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return contact_information.count;
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}
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