SHA-256 hash verification of flash slots, pico_hash_binary, flash:: namespace, ring_buffer iterator, non-destructive log

firmware/include/flash.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <cstdint>
+#include <tuple>
+
+namespace flash {
+
+constexpr uint32_t FLASH_BASE = 0x10000000;
+constexpr uint32_t FLASH_SIZE = 2 * 1024 * 1024;
+
+struct slot {
+    bool valid;
+    uint32_t version;
+    bool hash_ok;
+    auto as_tuple() const { return std::tie(valid, version, hash_ok); }
+    auto as_tuple() { return std::tie(valid, version, hash_ok); }
+};
+
+slot scan(uint32_t flash_offset);
+
+}