From 66589f5d3f83dbab745cfedb79680aaac583ac6b Mon Sep 17 00:00:00 2001
From: Alex Stewart <Alexander.Stewart@consensuscorp.com>
Date: Mon, 9 May 2016 20:47:30 -0700
Subject: [PATCH] Add sysparam_get_info function

---
 core/include/sysparam.h | 20 ++++++++++++++++++++
 core/sysparam.c         |  8 ++++++++
 2 files changed, 28 insertions(+)

diff --git a/core/include/sysparam.h b/core/include/sysparam.h
index 9854f60..9260e73 100644
--- a/core/include/sysparam.h
+++ b/core/include/sysparam.h
@@ -3,6 +3,10 @@
 
 #include <esp/types.h>
 
+#ifndef DEFAULT_SYSPARAM_SECTORS
+#define DEFAULT_SYSPARAM_SECTORS 4
+#endif
+
 /** @file sysparam.h
  *
  *  Read/write "system parameters" to persistent flash.
@@ -112,6 +116,22 @@ sysparam_status_t sysparam_init(uint32_t base_addr, uint32_t top_addr);
  */ 
 sysparam_status_t sysparam_create_area(uint32_t base_addr, uint16_t num_sectors, bool force);
 
+/** Get the start address and size of the currently active sysparam area
+ *
+ *  Fills in `base_addr` and `num_sectors` with the location and size of the
+ *  currently active sysparam area.  The returned values correspond to the
+ *  arguments passed to the sysparam_create_area() call when the area was
+ *  originally created.
+ *
+ *  @param[out] base_addr   The flash address at which the sysparam area starts
+ *  @param[out] num_sectors The number of flash sectors used by the sysparam
+ *                          area
+ *
+ *  @retval ::SYSPARAM_OK           Completed successfully
+ *  @retval ::SYSPARAM_ERR_NOINIT   No current sysparam area is active
+ */
+sysparam_status_t sysparam_get_info(uint32_t *base_addr, uint32_t *num_sectors);
+
 /** Get the value associated with a key
  *
  *  This is the core "get value" function.  It will retrieve the value for the
diff --git a/core/sysparam.c b/core/sysparam.c
index 0aa2cb2..cb08ac3 100644
--- a/core/sysparam.c
+++ b/core/sysparam.c
@@ -615,6 +615,14 @@ sysparam_status_t sysparam_create_area(uint32_t base_addr, uint16_t num_sectors,
     return SYSPARAM_OK;
 }
 
+sysparam_status_t sysparam_get_info(uint32_t *base_addr, uint32_t *num_sectors) {
+    if (!_sysparam_info.cur_base) return SYSPARAM_ERR_NOINIT;
+
+    *base_addr = min(_sysparam_info.cur_base, _sysparam_info.alt_base);
+    *num_sectors = (_sysparam_info.region_size / sdk_flashchip.sector_size) * 2;
+    return SYSPARAM_OK;
+}
+
 sysparam_status_t sysparam_get_data(const char *key, uint8_t **destptr, size_t *actual_length, bool *is_binary) {
     struct sysparam_context ctx;
     sysparam_status_t status;