enable reading out region from d7

Author: LOorts-Aloxy

stack/modules/d7ap/d7ap.c

@@ -235,3 +235,19 @@ uint8_t d7ap_get_access_class(void)
 {
     return d7ap_fs_read_dll_conf_active_access_class();
 }
+
+/**
+ * @brief Gets the region configured in the active access class
+ * 
+ * @param region the region variable to store the value
+ * @return error_t an error in case of failure
+ */
+error_t d7ap_get_modem_region(modem_region_t* region)
+{
+    channel_header_t channel_header;
+    uint32_t length = 1;
+
+    error_t err = d7ap_fs_read_file(D7A_FILE_ACCESS_PROFILE_ID + (d7ap_get_access_class() >> 4), D7A_FILE_ACCESS_PROFILE_CHANNEL_HEADER_IDX, (uint8_t*)&channel_header, &length, ROOT_AUTH);
+    *region = (channel_header.ch_freq_band == PHY_BAND_868) ? MODEM_REGION_EU868 : MODEM_REGION_US915;
+    return err;
+}

stack/modules/d7ap/inc/d7ap.h

@@ -36,6 +36,7 @@
 #include "types.h"
 #include "debug.h"
 #include "hwblockdevice.h"
+#include "modem_region.h"
 
 #define ID_TYPE_NBID_ID_LENGTH 1
 #define ID_TYPE_NOID_ID_LENGTH 0
@@ -303,6 +304,14 @@ static inline uint8_t d7ap_session_config_length(d7ap_session_config_t* itf_conf
  */
 void d7ap_add_result_to_array(d7ap_session_result_t* result, uint8_t* array);
 
+/**
+ * @brief Gets the region configured in the active access class
+ * 
+ * @param region the region variable to store the value
+ * @return error_t an error in case of failure
+ */
+error_t d7ap_get_modem_region(modem_region_t* region);
+
 #endif // D7AP_H
 
 /** @}*/

stack/modules/d7ap_fs/inc/d7ap_fs.h

@@ -75,6 +75,7 @@
 #define D7A_FILE_ACCESS_PROFILE_ID 0x20 // the first access class file
 #define D7A_FILE_ACCESS_PROFILE_SIZE 65
 #define D7A_FILE_ACCESS_PROFILE_COUNT 15
+#define D7A_FILE_ACCESS_PROFILE_CHANNEL_HEADER_IDX 0
 
 #define D7A_FILE_NWL_SECURITY		0x0D
 #define D7A_FILE_NWL_SECURITY_SIZE	5