system: Add request and print of NRF fw version

This adds use of a new SYSLINK message:

  SYSLINK_SYS_NRF_VERSION

The NRF will reply with a string, for example:

Example:
  2021.06 +1*

Which mean 1 commit from the 2021.06 tag and the * marks it as
"locally modified".

src/hal/interface/syslink.h

@@ -64,6 +64,9 @@
 #define SYSLINK_OW_READ     0x22
 #define SYSLINK_OW_WRITE    0x23
 
+#define SYSLINK_SYS_GROUP        0x30
+#define SYSLINK_SYS_NRF_VERSION  0x30
+
 typedef struct _SyslinkPacket
 {
   uint8_t type;

src/hal/src/syslink.c

@@ -43,6 +43,7 @@
 #include "pm.h"
 #include "ow.h"
 #include "static_mem.h"
+#include "system.h"
 
 #ifdef UART2_LINK_COMM
 #include "uart2.h"
@@ -102,6 +103,9 @@ static void syslinkRouteIncommingPacket(SyslinkPacket *slp)
     case SYSLINK_OW_GROUP:
       owSyslinkRecieve(slp);
       break;
+    case SYSLINK_SYS_GROUP:
+      systemSyslinkReceive(slp);
+      break;
     default:
       DEBUG_PRINT("Unknown packet:%X.\n", slp->type);
       break;

src/modules/interface/system.h

@@ -42,5 +42,7 @@ void systemSetArmed(bool val);
 bool systemIsArmed();
 
 void systemRequestShutdown();
+void systemRequestNRFVersion();
+void systemSyslinkReceive();
 
 #endif //__SYSTEM_H__

src/modules/src/system.c

@@ -83,6 +83,8 @@ static bool armed = ARM_INIT;
 static bool forceArm;
 static bool isInit;
 
+static char nrf_version[16];
+
 STATIC_MEM_TASK_ALLOC(systemTask, SYSTEM_TASK_STACKSIZE);
 
 /* System wide synchronisation */
@@ -200,6 +202,8 @@ void systemTask(void *arg)
   proximityInit();
 #endif
 
+  systemRequestNRFVersion();
+
   //Test the modules
   DEBUG_PRINT("About to run tests in system.c.\n");
   if (systemTest() == false) {
@@ -339,6 +343,29 @@ void systemRequestShutdown()
   syslinkSendPacket(&slp);
 }
 
+void systemRequestNRFVersion()
+{
+  SyslinkPacket slp;
+
+  slp.type = SYSLINK_SYS_NRF_VERSION;
+  slp.length = 0;
+  syslinkSendPacket(&slp);
+}
+
+void systemSyslinkReceive(SyslinkPacket *slp)
+{
+  if (slp->type == SYSLINK_SYS_NRF_VERSION)
+  {
+    size_t len = slp->length - 2;
+
+    if (sizeof(nrf_version) - 1 <=  len) {
+      len = sizeof(nrf_version) - 1;
+    }
+    memcpy(&nrf_version, &slp->data[0], len);
+    DEBUG_PRINT("NRF51 version: %s\n", nrf_version);
+  }
+}
+
 void vApplicationIdleHook( void )
 {
   static uint32_t tickOfLatestWatchdogReset = M2T(0);