Merge pull request #10934 from evva-sfw/feature/NRF_Cordio_low_frequency_clock

Fix: Low frequency clock will now selected by given "lf_clock_src" setting.

Author: 0xc0170

features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_NORDIC_CORDIO/TARGET_NRF5x/NRFCordioHCIDriver.cpp

@@ -40,6 +40,7 @@
 
 // Nordic Includes
 #include "nrf.h"
+#include "nrf5x_lf_clk_helper.h"
 
 #include "NRFCordioHCIDriver.h"
 #include "NRFCordioHCITransportDriver.h"
@@ -78,6 +79,14 @@ using namespace ble::vendor::cordio;
 /*! \brief      Typical implementation revision number (LlRtCfg_t::implRev). */
 #define LL_IMPL_REV             0x2303
 
+#if MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_SYNTH
+#define NRF_LF_CLK_SRC CLOCK_LFCLKSRC_SRC_Synth
+#elif MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_XTAL
+#define NRF_LF_CLK_SRC CLOCK_LFCLKSRC_SRC_Xtal
+#elif MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_RC
+#define NRF_LF_CLK_SRC CLOCK_LFCLKSRC_SRC_RC
+#endif
+
 // Note to implementer: this should be amended if the Cordio stack is updated
 
 // The Nordic-specific baseband configuration
@@ -283,7 +292,7 @@ void NRFCordioHCIDriver::do_initialize()
     }
 
     /* configure low-frequency clock */
-    NRF_CLOCK->LFCLKSRC             = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
+    NRF_CLOCK->LFCLKSRC             = (NRF_LF_CLK_SRC << CLOCK_LFCLKSRC_SRC_Pos);
     NRF_CLOCK->EVENTS_LFCLKSTARTED  = 0;
     NRF_CLOCK->TASKS_LFCLKSTART     = 1;
     while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)