refactor(hw_timer): Refactor hw_timer driver for esp8266 idf

components/esp8266/include/esp8266/timer_struct.h

@@ -0,0 +1,70 @@
+// Copyright 2018-2025 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <stdint.h>
+#include "esp8266/eagle_soc.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* ESP8266 FRC Register Definitions */
+
+// FRC1 is a 24-bit countdown timer, triggers interrupt when reaches zero.
+typedef struct {
+    union {
+        struct {
+            uint32_t data:        23;
+            uint32_t reserved23:   9;
+        };
+        uint32_t val;
+    } load;
+
+    union {
+        struct {
+            uint32_t data:        23;
+            uint32_t reserved23:   9;
+        };
+        uint32_t val;
+    } count;
+
+    union {
+        struct {
+            uint32_t div:          6;
+            uint32_t reload:       1;
+            uint32_t en:           1;
+            uint32_t intr_type:    1;
+            uint32_t reserved24:  23;
+        };
+        uint32_t val;
+    } ctrl;
+
+    union {
+        struct {
+            uint32_t clr:          1;
+            uint32_t reserved1:   31;
+        };
+        uint32_t val;
+    } intr;
+} frc1_struct_t;
+
+extern volatile frc1_struct_t frc1;
+
+#ifdef __cplusplus
+}
+#endif  /* end of __cplusplus */
+