1 files changed, 87 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/NRF51822/hal_lld.c b/os/hal/ports/NRF5/NRF51822/hal_lld.c
new file mode 100644
index 0000000..f33fdda
--- /dev/null
+++ b/os/hal/ports/NRF5/NRF51822/hal_lld.c
@@ -0,0 +1,87 @@
+/*
+    Copyright (C) 2015 Fabio Utzig
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    NRF51/NRF51822/hal_lld.c
+ * @brief   NRF51822 HAL Driver subsystem low level driver source.
+ *
+ * @addtogroup HAL
+ * @{
+ */
+
+#include "hal.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level HAL driver initialization.
+ *
+ * @notapi
+ */
+void hal_lld_init(void)
+{
+  /* High frequency clock initialisation
+   *  (If NRF5_XTAL_VALUE is not defined assume its an 16Mhz RC oscillator)
+   */
+  NRF_CLOCK->TASKS_HFCLKSTOP = 1;
+#if defined(NRF5_XTAL_VALUE)
+#if   NRF5_XTAL_VALUE == 16000000
+  NRF_CLOCK->XTALFREQ = 0xFF;
+#elif NRF5_XTAL_VALUE == 32000000
+  NRF_CLOCK->XTALFREQ = 0x00;
+#else
+#error "Unsupported XTAL value"
+#endif
+#endif
+
+  
+  /* Low frequency clock initialisation
+   * Clock is only started if st driver requires it
+   */
+  NRF_CLOCK->TASKS_LFCLKSTOP = 1;
+  NRF_CLOCK->LFCLKSRC = NRF5_LFCLK_SOURCE;
+  
+#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE) &&			\
+    (NRF5_SYSTEM_TICKS == NRF5_SYSTEM_TICKS_AS_RTC)
+  NRF_CLOCK->TASKS_LFCLKSTART = 1;
+#endif
+}
+
+/**
+ * @}
+ */