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Commit32839cb

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libraries/Storage: Add flash FS examples.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
1 parent5e4392f commit32839cb

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/*
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Flash Format
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The sketch formats the board flash storage as follows:
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* Partition 1 1MB: used for network certificates
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* Partition 2 5MB: OTA
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* Partition 3 1MB: Provisioning KVStore
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* Partition 4 7MB: User data
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This example code is in the public domain.
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*/
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#include<Arduino.h>
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#include<zephyr/fs/fs.h>
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#include<zephyr/storage/flash_map.h>
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#include"certificates.h"
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// MBR structures
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struct__attribute__((packed)) mbrEntry {
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uint8_t status;
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uint8_t chsStart[3];
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uint8_t type;
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uint8_t chsStop[3];
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uint32_t lbaOffset;
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uint32_t lbaSize;
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};
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struct__attribute__((packed)) mbrTable {
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mbrEntry entries[4];
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uint8_t signature[2];
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};
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boolwaitResponse() {
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bool proceed =false;
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bool confirmation =false;
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while (confirmation ==false) {
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if (!Serial.available()) {
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continue;
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}
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switch (Serial.read()) {
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case'y':
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case'Y':
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confirmation =true;
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proceed =true;
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break;
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case'n':
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case'N':
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confirmation =true;
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proceed =false;
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break;
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default:
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continue;
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}
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}
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return proceed;
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}
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intformatPartition(unsignedint partition_id,int fs_type) {
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Serial.print("Formatting partition as");
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Serial.println(fs_type == FS_FATFS ?"FAT..." :"LittleFS...");
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int rc =0;
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if (fs_type == FS_FATFS) {
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rc =fs_mkfs(FS_FATFS, partition_id,NULL,0);
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}else {
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rc =fs_mkfs(FS_LITTLEFS, partition_id,NULL,0);
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}
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if (rc <0) {
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Serial.print("Error formatting partition:");
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Serial.println(rc);
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return rc;
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}
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Serial.print("Partition formatted successfully!");
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return0;
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}
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intflashCertificates() {
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Serial.print("Certificate size:");
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Serial.print(cacert_pem_len);
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Serial.println(" bytes");
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structfs_file_t file;
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fs_file_t_init(&file);
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Serial.println("Opening /wlan:/cacert.pem for writing...");
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int rc =fs_open(&file,"/wlan:/cacert.pem", FS_O_CREATE | FS_O_WRITE);
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if (rc !=0) {
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Serial.print("Error opening cacert.pem:");
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Serial.println(rc);
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return rc;
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}
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Serial.println("Writing certificates...");
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ssize_t ret =fs_write(&file, cacert_pem, cacert_pem_len);
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if (ret <0) {
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Serial.print("Error writing certificates:");
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Serial.println(ret);
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fs_close(&file);
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return rc;
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}
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rc =fs_sync(&file);
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if (rc !=0) {
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Serial.print("Warning: fs_sync failed:");
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Serial.println(rc);
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fs_close(&file);
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return rc;
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}
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fs_close(&file);
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Serial.println("Certificates written successfully!");
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return0;
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}
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intflashMBR() {
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Serial.println("Creating MBR partition table...");
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// Open the MBR partition
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conststructflash_area *fa;
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int ret =flash_area_open(FIXED_PARTITION_ID(mbr_partition), &fa);
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if (ret) {
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Serial.print("Error opening MBR partition:");
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Serial.println(ret);
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return ret;
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}
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// Prepare 512-byte sector with MBR
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uint8_t sector[512];
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memset(sector,0,512);
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// MBR partition table starts at offset 446
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mbrTable *table = (mbrTable*)&sector[446];
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// Note: lbaSize is in units of 4096-byte blocks (not standard 512-byte sectors)
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// This matches the original Arduino implementation which uses 4KB sectors
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// Partition 1: WLAN (FAT32) - starts at 0x1000, size ~1020KB (255 blocks of 4KB)
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table->entries[0].status =0x00;// Not bootable
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table->entries[0].chsStart[0] =0;
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table->entries[0].chsStart[1] =2;
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table->entries[0].chsStart[2] =0;
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table->entries[0].type =0x0B;// FAT32
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table->entries[0].chsStop[0] =4;
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table->entries[0].chsStop[1] =0;
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table->entries[0].chsStop[2] =0;
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table->entries[0].lbaOffset =1;// 0x1000 / 4096 = 1
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table->entries[0].lbaSize =255;// (1MB - 4KB) / 4096 = 255
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// Partition 2: OTA (FAT32) - starts at 0x100000, size 5MB (1280 blocks of 4KB)
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table->entries[1].status =0x00;
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table->entries[1].chsStart[0] =4;
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table->entries[1].chsStart[1] =1;
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table->entries[1].chsStart[2] =0;
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table->entries[1].type =0x0B;// FAT32
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table->entries[1].chsStop[0] =24;
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table->entries[1].chsStop[1] =0;
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table->entries[1].chsStop[2] =0;
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table->entries[1].lbaOffset =256;// 0x100000 / 4096 = 256
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table->entries[1].lbaSize =1280;// 5MB / 4096 = 1280
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// Partition 3: KVS (FAT32) - starts at 0x600000, size 1MB (256 blocks of 4KB)
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table->entries[2].status =0x00;
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table->entries[2].chsStart[0] =24;
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table->entries[2].chsStart[1] =1;
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table->entries[2].chsStart[2] =0;
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table->entries[2].type =0x0B;// FAT32
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table->entries[2].chsStop[0] =28;
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table->entries[2].chsStop[1] =0;
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table->entries[2].chsStop[2] =0;
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table->entries[2].lbaOffset =1536;// 0x600000 / 4096 = 1536
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table->entries[2].lbaSize =256;// 1MB / 4096 = 256
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// Partition 4: Storage (LittleFS/FAT32) - starts at 0x700000, size 7MB (1792 blocks of 4KB)
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table->entries[3].status =0x00;
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table->entries[3].chsStart[0] =28;
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table->entries[3].chsStart[1] =1;
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table->entries[3].chsStart[2] =0;
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table->entries[3].type =0x0B;// FAT32 (could be 0x83 for LittleFS)
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table->entries[3].chsStop[0] =56;
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table->entries[3].chsStop[1] =0;
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table->entries[3].chsStop[2] =0;
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table->entries[3].lbaOffset =1792;// 0x700000 / 4096 = 1792
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table->entries[3].lbaSize =1792;// 7MB / 4096 = 1792
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// MBR signature
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table->signature[0] =0x55;
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table->signature[1] =0xAA;
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// Erase the MBR partition
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ret =flash_area_erase(fa,0, fa->fa_size);
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if (ret) {
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Serial.print("Error erasing MBR partition:");
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Serial.println(ret);
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flash_area_close(fa);
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return ret;
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}
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// Write the MBR sector
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ret =flash_area_write(fa,0, sector,512);
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if (ret) {
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Serial.print("Error writing MBR:");
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Serial.println(ret);
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flash_area_close(fa);
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return ret;
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}
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flash_area_close(fa);
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Serial.println("MBR created successfully!");
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return0;
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}
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voidsetup() {
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Serial.begin(115200);
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while (!Serial);
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Serial.println("\nWARNING! Running the sketch all the content of the flash storage will be erased.");
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Serial.println("The following partitions will be created:");
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Serial.println("Partition 1: Network certificates 1MB");
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Serial.println("Partition 2: OTA 5MB");
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Serial.println("Partition 3: Provisioning KVStore 1MB");
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Serial.println("Partition 4: User data 7MB");
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Serial.println("Do you want to proceed? Y/[n]");
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if (!waitResponse()) {
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return;
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}
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// Create MBR partition table FIRST before formatting
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if (flashMBR()) {
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return;
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}
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// Format Partition 1: WLAN
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Serial.println("\nPartition 1 (/wlan:) will be formatted as FAT.");
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Serial.println("Do you want to format it? Y/[n]");
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bool format_wlan =waitResponse();
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if (format_wlan) {
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if (formatPartition((uintptr_t)"wlan:", FS_FATFS)) {
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return;
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}
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Serial.println("\nDo you want to restore the TLS certificates? Y/[n]");
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if (waitResponse() &&flashCertificates()) {
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return;
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}
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}
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// Format Partition 2: OTA
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Serial.println("\nPartition 2 (/ota:) will be formatted as FAT.");
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Serial.println("Do you want to format it? Y/[n]");
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if (waitResponse()) {
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if (formatPartition((uintptr_t)"ota:", FS_FATFS)) {
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return;
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}
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}
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// Format Partition 4: Storage
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Serial.println("\nDo you want to use LittleFS to format user data partition? Y/[n]");
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Serial.println("If No, FatFS will be used to format user partition.");
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bool useLittleFS =waitResponse();
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Serial.println("\nPartition 4 (/storage) will be formatted.");
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Serial.println("Do you want to format it? Y/[n]");
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if (waitResponse()) {
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if (useLittleFS) {
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unsignedint partition_id =DT_FIXED_PARTITION_ID(DT_PROP(DT_NODELABEL(storage_fs), partition));
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if (formatPartition(partition_id, FS_LITTLEFS)) {
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return;
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}
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}else {
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Serial.println("FatFS for storage partition not implemented in this example.");
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Serial.println("Please use LittleFS or update device tree configuration.");
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}
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}
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Serial.println("\nFlash storage formatted!");
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Serial.println("It's now safe to reboot or disconnect your board.");
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}
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voidloop() {
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delay(1000);
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}

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