[BEETLE] Add BLE Cordio support into CMSIS

This patch adds BLE Cordio support into CMSIS. It provides:
* A modification for the linker scripts for both ARMCC and GCC
  compilers that adds the cordio specific sections.
* A method to access the Flash stored MAC Address.

The CORDIO_RO_2.1.o and TRIM_2.1.o objects that rappresent the Cordio
firmware will be added by a future patch.

Signed-off-by: Vincenzo Frascino <[email protected]>

Author: fvincenzo

hal/targets/cmsis/TARGET_ARM_SSG/TARGET_BEETLE/TOOLCHAIN_ARM_STD/BEETLE.sct

@@ -27,6 +27,7 @@ LR_IROM1 0x00000000 0x00040000  {    ; load region size_region
    *.o (RESET, +FIRST)
    *(InRoot$$Sections)
    .ANY (+RO)
+   CORDIO_RO_2.1.o (*)
   }
   ; Total: 80 vectors = 320 bytes (0x140) to be reserved in RAM
   RW_IRAM1 (0x20000000+0x140) (0x20000-0x140)  {  ; RW data

hal/targets/cmsis/TARGET_ARM_SSG/TARGET_BEETLE/TOOLCHAIN_GCC_ARM/BEETLE.ld

@@ -70,6 +70,12 @@ SECTIONS
          . = ALIGN(4);
     } > VECTORS
 
+    .cordio :
+    {
+        *CORDIO_RO_2.1.o
+        *TRIM_2.1.o
+    } > FLASH
+
     .text :
     {
         *(.text*)

hal/targets/cmsis/TARGET_ARM_SSG/TARGET_BEETLE/system_core_beetle.c

@@ -119,3 +119,36 @@ void SystemPowerResume(power_mode_t mode)
         __DSB();
     }
 }
+
+
+/*
+ * System config data storage functions
+ * Reserved as the data is not strictly persistent
+ */
+
+/*
+ * __System_Config_GetBDAddr(): Address for the BLE device on the air.
+ */
+void __System_Config_GetBDAddr(uint8_t *addr, uint8_t byte_len)
+{
+    SystemCoreConfigData *p;
+    int bank1addr = EFlash_ReturnBank1BaseAddress();
+
+    if (byte_len > 6)
+    {
+        return;
+    }
+
+    if (bank1addr < 0)
+    {
+        memset(addr, 0xFF, byte_len);
+    }
+    else
+    {
+        /* 2x bank1 address is the top as banks have to be symmetric sizes */
+        /* The data is stored at the end.*/
+        p = (SystemCoreConfigData *) ((2 * bank1addr) - SYSTEM_CORE_CONFIG_DATA_SIZE);
+
+        memcpy(addr, p->BD_ADDR, byte_len);
+    }
+}

hal/targets/cmsis/TARGET_ARM_SSG/TARGET_BEETLE/system_core_beetle.h

@@ -65,6 +65,29 @@ void SystemPowerSuspend(power_mode_t mode);
  */
 void SystemPowerResume(power_mode_t mode);
 
+/*
+ * Definitions for storing static configuration data in Beetle
+ * This is not strictly persistent data as it will get wiped out on chip erase.
+ *
+ * There are only read functions provided.
+ * No Write function to prevent accidental writes resulting in
+ * the system being non responsive.
+ * Use the Flash manual before trying to write anything in the last 4k.
+ */
+#define SYSTEM_CORE_CONFIG_DATA_SIZE (0x200) /* 512 bytes*/
+
+typedef struct {
+    uint32_t BD_ADDR[2];
+
+    /*rest reserved*/
+    uint32_t reserved[SYSTEM_CORE_CONFIG_DATA_SIZE - 2];
+} SystemCoreConfigData;
+
+/*
+ * __System_Config_GetBDAddr(): Address for the BLE device on the air.
+ */
+void __System_Config_GetBDAddr(uint8_t *addr, uint8_t len);
+
 #ifdef __cplusplus
 }
 #endif