feat: Power-Cycle-Zähler für den Werksreset

src/config/nl_reset_counter.c

@@ -0,0 +1,58 @@
+#include "config/nl_reset_counter.h"
+
+#include "config/nl_flash.h"
+
+#define REC_TAG   0x5A000000u
+#define REC_MASK  0xFF000000u
+#define REC_FREE  0xFFFFFFFFu
+#define REC_SLOTS (NL_FLASH_SECTOR_SIZE / 4u)
+
+static uint32_t s_sector;
+static uint32_t s_next;
+static uint8_t s_count;
+
+void nl_resetcnt_init(uint32_t sector)
+{
+    uint32_t w;
+
+    s_sector = sector;
+    s_next = 0;
+    s_count = 0;
+    for (uint32_t i = 0; i < REC_SLOTS; i++) {
+        if (nl_flash_read(sector + i * 4u, &w, 4) != 0 || w == REC_FREE)
+            continue;
+        s_next = i + 1;
+        s_count = ((w & REC_MASK) == REC_TAG) ? (uint8_t)(w & 0xFFu) : 0;
+    }
+}
+
+static int put(uint8_t count)
+{
+    uint32_t w = REC_TAG | count;
+    int r;
+
+    if (s_next >= REC_SLOTS) {
+        if (nl_flash_erase_sector(s_sector) != 0)
+            return -1;
+        s_next = 0;
+    }
+    r = nl_flash_write(s_sector + s_next * 4u, &w, 4);
+    s_next++;
+    if (r == 0)
+        s_count = count;
+    return r;
+}
+
+uint8_t nl_resetcnt_boot(void)
+{
+    uint8_t c = s_count < 255 ? (uint8_t)(s_count + 1) : 255;
+    put(c);
+    return c;
+}
+
+int nl_resetcnt_clear(void)
+{
+    if (s_count == 0)
+        return 0;
+    return put(0);
+}

src/config/nl_reset_counter.h

@@ -0,0 +1,13 @@
+#ifndef NL_RESET_COUNTER_H
+#define NL_RESET_COUNTER_H
+
+#include <stdint.h>
+
+#define NL_FACTORY_RESET_BOOTS 5u
+#define NL_RESETCNT_CLEAR_MS   5000u
+
+void    nl_resetcnt_init(uint32_t sector);
+uint8_t nl_resetcnt_boot(void);
+int     nl_resetcnt_clear(void);
+
+#endif