Import Mbed OS hard-float snapshot

targets/TARGET_NORDIC/TARGET_NRF5x/nrf5x_lf_clk_helper.h

@@ -0,0 +1,106 @@
+/* 
+ * Copyright (c) 2016 Nordic Semiconductor ASA
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ *   1. Redistributions of source code must retain the above copyright notice, this list 
+ *      of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA 
+ *      integrated circuit in a product or a software update for such product, must reproduce 
+ *      the above copyright notice, this list of conditions and the following disclaimer in 
+ *      the documentation and/or other materials provided with the distribution.
+ *
+ *   3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be 
+ *      used to endorse or promote products derived from this software without specific prior 
+ *      written permission.
+ *
+ *   4. This software, with or without modification, must only be used with a 
+ *      Nordic Semiconductor ASA integrated circuit.
+ *
+ *   5. Any software provided in binary or object form under this license must not be reverse 
+ *      engineered, decompiled, modified and/or disassembled. 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+#ifndef __NRF5X_LF_CLK_HELPER_H_
+    
+#ifndef MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC
+    #define MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC (NRF_LF_SRC_XTAL)
+    #warning No configuration for LF clock source. Xtal source will be used as a default configuration.
+#endif
+
+#define DEFAULT_LFCLK_CONF_ACCURACY NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM
+
+#ifdef NRF52
+    #define MAX_LFCLK_CONF_RC_CTIV    32
+#else
+    #define MAX_LFCLK_CONF_RC_CTIV    64
+#endif
+
+#define MAX_LFCLK_CONF_RC_TEMP_CTIV   33
+
+#define DEFAULT_LFCLK_CONF_RC_CTIV 16     // Check temperature every 16 * 250ms.
+#define DEFAULT_LFCLK_CONF_RC_TEMP_CTIV 1 // Only calibrate if temperature has changed.
+
+
+#define NRF_LF_SRC_XTAL  2 
+#define NRF_LF_SRC_SYNTH 3 
+#define NRF_LF_SRC_RC    4
+
+#if MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_SYNTH
+    #define NRF_SDH_CLOCK_LF_SRC NRF_CLOCK_LF_SRC_SYNTH
+    #define NRF_SDH_CLOCK_LF_RC_CTIV      0 // Must be 0 if source is not NRF_CLOCK_LF_SRC_RC.
+    #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 0 // Must be 0 if source is not NRF_CLOCK_LF_SRC_RC.
+    #define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_Synth)
+#elif MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_XTAL
+    #define NRF_SDH_CLOCK_LF_SRC NRF_CLOCK_LF_SRC_XTAL
+    #define NRF_SDH_CLOCK_LF_RC_CTIV      0 // Must be 0 if source is not NRF_CLOCK_LF_SRC_RC.
+    #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 0 // Must be 0 if source is not NRF_CLOCK_LF_SRC_RC.
+    #define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_Xtal)
+#elif MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_RC
+    #define NRF_SDH_CLOCK_LF_SRC NRF_CLOCK_LF_SRC_RC
+
+    #ifdef MBED_CONF_NORDIC_NRF_LF_CLOCK_CALIB_TIMER_INTERVAL
+        #define NRF_SDH_CLOCK_LF_RC_CTIV MBED_CONF_NORDIC_NRF_LF_CLOCK_CALIB_TIMER_INTERVAL
+    #else
+        #define NRF_SDH_CLOCK_LF_RC_CTIV DEFAULT_LFCLK_CONF_RC_CTIV
+    #endif
+
+    #ifdef MBED_CONF_NORDIC_NRF_LF_CLOCK_CALIB_MODE_CONFIG
+        #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV MBED_CONF_NORDIC_NRF_LF_CLOCK_CALIB_MODE_CONFIG
+    #else
+        #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV DEFAULT_LFCLK_CONF_RC_TEMP_CTIV
+    #endif
+
+    #if (NRF_SDH_CLOCK_LF_RC_CTIV < 1) || (NRF_SDH_CLOCK_LF_RC_CTIV > MAX_LFCLK_CONF_RC_CTIV)
+        #error Calibration timer interval out of range!
+    #endif
+
+    #if (NRF_SDH_CLOCK_LF_RC_TEMP_CTIV < 0 ) || (NRF_SDH_CLOCK_LF_RC_TEMP_CTIV > 33)
+        #error Number/mode of LF RC calibration intervals out of range!
+    #endif
+
+    #define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_RC)
+#else
+    #error Bad LFCLK configuration. Declare proper source through mbed configuration.
+#endif
+
+#undef NRF_LF_SRC_XTAL
+#undef NRF_LF_SRC_SYNTH
+#undef NRF_LF_SRC_RC
+
+#endif