Initial Support for RP2040 platform (#3284)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

esphome/components/rp2040/preferences.cpp

@@ -0,0 +1,49 @@
+#ifdef USE_RP2040
+
+#include "preferences.h"
+
+#include <cstring>
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+#include "esphome/core/preferences.h"
+
+namespace esphome {
+namespace rp2040 {
+
+static const char *const TAG = "rp2040.preferences";
+
+class RP2040PreferenceBackend : public ESPPreferenceBackend {
+ public:
+  bool save(const uint8_t *data, size_t len) override { return true; }
+  bool load(uint8_t *data, size_t len) override { return false; }
+};
+
+class RP2040Preferences : public ESPPreferences {
+ public:
+  ESPPreferenceObject make_preference(size_t length, uint32_t type, bool in_flash) override {
+    auto *pref = new RP2040PreferenceBackend();  // NOLINT(cppcoreguidelines-owning-memory)
+    return ESPPreferenceObject(pref);
+  }
+
+  ESPPreferenceObject make_preference(size_t length, uint32_t type) override {
+    auto *pref = new RP2040PreferenceBackend();  // NOLINT(cppcoreguidelines-owning-memory)
+    return ESPPreferenceObject(pref);
+  }
+
+  bool sync() override { return true; }
+
+  bool reset() override { return true; }
+};
+
+void setup_preferences() {
+  auto *prefs = new RP2040Preferences();  // NOLINT(cppcoreguidelines-owning-memory)
+  global_preferences = prefs;
+}
+
+}  // namespace rp2040
+
+ESPPreferences *global_preferences;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
+}  // namespace esphome
+
+#endif  // USE_RP2040