init with spiffs

.gitignore

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+.pio
+.vscode
+
+data/*.dat

data/config.txt

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+0123456789
+-100
+-50
+300

data/position.txt

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+0
+0

lib/VFileSystem/VFileSystem.cpp

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+#include "VFileSystem.h"
+#include <FS.h>
+#include <SPIFFS.h>
+
+int VFileSystem::Init()
+{
+    if (!SPIFFS.begin(FORMAT_SPIFFS_IF_FAILED)) {
+        return -1;
+    }
+
+    return 0;
+}
+
+size_t VFileSystem::TotalSpace()
+{
+    return SPIFFS.totalBytes();
+}
+
+size_t VFileSystem::FreeSpace()
+{
+    return SPIFFS.totalBytes() - SPIFFS.usedBytes();
+}
+
+int VFileSystem::ReadFile(const char* fileName, uint8_t* result, int len)
+{
+    File file = SPIFFS.open(fileName, FILE_READ);
+    if (!file || file.isDirectory()) {
+        return -1;
+    }
+    
+    int filePos = 0;
+    int ret = 0;
+    while (file.available()) {
+        result[filePos] = file.read();
+        filePos++;
+        if (filePos == len) {
+            ret = -2;
+            break;
+        }
+    }
+    file.close();
+
+    return ret;
+}
+
+int VFileSystem::WriteFile(const char* fileName, const uint8_t* data, int len)
+{
+    File file = SPIFFS.open(fileName, FILE_WRITE);
+    if (!file) {
+        return -1;
+    }
+
+    int ret = 0;
+    for (int i = 0; i < len; i++) {
+        if (file.write(data[i]) != 1) {
+            ret = -1;
+            break;
+        }
+    }
+    file.close();
+
+    return ret;
+}

lib/VFileSystem/VFileSystem.h

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+#pragma once
+
+#include <Arduino.h>
+
+#define FORMAT_SPIFFS_IF_FAILED false
+
+class VFileSystem
+{
+public:
+    int Init();
+    size_t TotalSpace();
+    size_t FreeSpace();
+    int ReadFile(const char* fileName, uint8_t* result, int len);
+    int WriteFile(const char* fileName, const uint8_t* data, int len);
+};

partitions_12M_SPIFFS.csv

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+# Name,   Type, SubType, Offset,  Size, Flags
+nvs,      data, nvs,     0x9000,  0x5000,
+otadata,  data, ota,     0xe000,  0x2000,
+app0,     app,  ota_0,   0x10000, 0x3F0000,
+spiffs,   data, spiffs,  0x400000,0xBF0000,
+coredump, data, coredump,0xFF0000,0x10000,

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-s2-sensor-recorder]
+platform = espressif32
+board = adafruit_metro_esp32s2
+board_build.flash_mode = qio
+board_upload.flash_size = 16MB
+board_build.partitions = partitions_12M_SPIFFS.csv
+framework = arduino
+upload_port = COM8

src/main.cpp

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+#include <Arduino.h>
+#include <vector>
+#include <string>
+#include "VFileSystem.h"
+
+VFileSystem fs;
+
+uint8_t testBuf[6 * 1024];
+
+void setup()
+{
+    Serial1.begin(115200);
+    Serial1.println("Begin...");
+
+    if (fs.Init()) {
+        Serial1.println("FS Init Failed.");
+        return;
+    }
+
+    Serial1.printf("FreeSpace: %ld\n", fs.FreeSpace());
+
+    Serial1.println("Read File:");
+
+    fs.ReadFile("/rec-0000.dat", testBuf, 6 * 1024);
+
+    for (int i = 0; i < 6 * 1024; i++) {
+        Serial1.printf("%#x ", testBuf[i]);
+    }
+
+    Serial1.println();
+
+    Serial1.println("Write File:");
+
+    for (int i = 0; i < 6 * 1024; i++) {
+        testBuf[i] = i % 2 ? 0x5a : 0x66;
+    }
+
+    fs.WriteFile("/rec-0000.dat", testBuf, 6 * 1024);
+
+    Serial1.println("End.");
+}
+
+void loop()
+{
+
+}

tools/init_fs.py

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+for i in range(1024):
+    with open(f"../data/rec-{str(i).zfill(4)}.dat", "wb") as f:
+        data = b""
+        for j in range(6144):
+            data += b"\xff"
+        f.write(data)