add peripheral module struct headers

components/esp32/include/soc/gpio_sd_struct.h

@@ -0,0 +1,48 @@
+// Copyright 2015-2016 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.
+#ifndef _SOC_GPIO_SD_STRUCT_H_
+#define _SOC_GPIO_SD_STRUCT_H_
+typedef struct {
+    union {
+        struct {
+            volatile uint32_t sd_in:       8;
+            volatile uint32_t prescale:    8;
+            volatile uint32_t reserved16: 16;
+        };
+        volatile uint32_t val;
+    }sigmadelta[8];
+    union {
+        struct {
+            volatile uint32_t reserved0: 31;
+            volatile uint32_t clk_en:     1;
+        };
+        volatile uint32_t val;
+    }sigmadelta_cg;
+    union {
+        struct {
+            volatile uint32_t reserved0: 31;
+            volatile uint32_t spi_swap:   1;
+        };
+        volatile uint32_t val;
+    }sigmadelta_misc;
+    union {
+        struct {
+            volatile uint32_t date:      28;
+            volatile uint32_t reserved28: 4;
+        };
+        volatile uint32_t val;
+    }sigmadelta_version;
+} gpio_sd_dev_t;
+extern volatile gpio_sd_dev_t SIGMADELTA;
+#endif  /* _SOC_GPIO_SD_STRUCT_H_ */