rtc, keeping time

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diff --git a/drivers_nrf/nrf_log.h b/drivers_nrf/nrf_log.h
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+/**
+ * Copyright (c) 2016 - 2017, 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 form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
+ * 
+ */
+/**@file
+ *
+ * @defgroup nrf_log Logger module
+ * @{
+ * @ingroup app_common
+ *
+ * @brief The nrf_log module interface.
+ */
+
+#ifndef NRF_LOG_H_
+#define NRF_LOG_H_
+
+#include "sdk_common.h"
+#if NRF_MODULE_ENABLED(NRF_LOG)
+#include "nrf_strerror.h"
+#define NRF_LOG_ERROR_STRING_GET(code) nrf_strerror_get(code)
+#else
+#define NRF_LOG_ERROR_STRING_GET(code) ""
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @brief  Default module name prefix.
+ *
+ * The prefix can be defined in a module to override the default.
+ */
+#ifndef NRF_LOG_MODULE_NAME
+    #define NRF_LOG_MODULE_NAME ""
+#endif
+
+/** @brief Severity level for the module.
+ *
+ * The severity level can be defined in a module to override the default.
+ */
+#ifndef NRF_LOG_LEVEL
+    #define NRF_LOG_LEVEL NRF_LOG_DEFAULT_LEVEL
+#endif
+
+/** @brief  Color prefix of debug logs for the module.
+ *
+ * This color prefix can be defined in a module to override the default.
+ */
+#ifndef NRF_LOG_DEBUG_COLOR
+    #define NRF_LOG_DEBUG_COLOR NRF_LOG_COLOR_DEFAULT
+#endif
+
+/** @brief  Color prefix of info logs for the module.
+ *
+ * This color prefix can be defined in a module to override the default.
+ */
+#ifndef NRF_LOG_INFO_COLOR
+    #define NRF_LOG_INFO_COLOR NRF_LOG_COLOR_DEFAULT
+#endif
+
+#include "nrf_log_internal.h"
+
+/** @def NRF_LOG_ERROR
+ *  @brief Macro for logging error messages. It takes a printf-like, formatted
+ *  string with up to seven arguments.
+ *
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes error logs.
+ */
+
+/** @def NRF_LOG_WARNING
+ *  @brief Macro for logging error messages. It takes a printf-like, formatted
+ *  string with up to seven arguments.
+ *
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes warning logs.
+ */
+
+/** @def NRF_LOG_INFO
+ *  @brief Macro for logging error messages. It takes a printf-like, formatted
+ *  string with up to seven arguments.
+ *
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes info logs.
+ */
+
+/** @def NRF_LOG_DEBUG
+ *  @brief Macro for logging error messages. It takes a printf-like, formatted
+ *  string with up to seven arguments.
+ *
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes debug logs.
+ */
+
+#define NRF_LOG_ERROR(...)                     NRF_LOG_INTERNAL_ERROR(__VA_ARGS__)
+#define NRF_LOG_WARNING(...)                   NRF_LOG_INTERNAL_WARNING( __VA_ARGS__)
+#define NRF_LOG_INFO(...)                      NRF_LOG_INTERNAL_INFO( __VA_ARGS__)
+#define NRF_LOG_DEBUG(...)                     NRF_LOG_INTERNAL_DEBUG( __VA_ARGS__)
+
+/**
+ * @brief A macro for logging a formatted string without any prefix or timestamp.
+ */
+#define NRF_LOG_RAW_INFO(...)                  NRF_LOG_INTERNAL_RAW_INFO( __VA_ARGS__)
+
+/** @def NRF_LOG_HEXDUMP_ERROR
+ *  @brief Macro for logging raw bytes.
+ *  @details It is compiled in only if @ref NRF_LOG_LEVEL includes error logs.
+ *
+ * @param p_data     Pointer to data.
+ * @param len        Data length in bytes.
+ */
+/** @def NRF_LOG_HEXDUMP_WARNING
+ *  @brief Macro for logging raw bytes.
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes warning logs.
+ *
+ * @param p_data     Pointer to data.
+ * @param len        Data length in bytes.
+ */
+/** @def NRF_LOG_HEXDUMP_INFO
+ *  @brief Macro for logging raw bytes.
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes info logs.
+ *
+ * @param p_data     Pointer to data.
+ * @param len        Data length in bytes.
+ */
+/** @def NRF_LOG_HEXDUMP_DEBUG
+ *  @brief Macro for logging raw bytes.
+ *  @details This macro is compiled only if @ref NRF_LOG_LEVEL includes debug logs.
+ *
+ * @param p_data     Pointer to data.
+ * @param len        Data length in bytes.
+ */
+#define NRF_LOG_HEXDUMP_ERROR(p_data, len)   NRF_LOG_INTERNAL_HEXDUMP_ERROR(p_data, len)
+#define NRF_LOG_HEXDUMP_WARNING(p_data, len) NRF_LOG_INTERNAL_HEXDUMP_WARNING(p_data, len)
+#define NRF_LOG_HEXDUMP_INFO(p_data, len)    NRF_LOG_INTERNAL_HEXDUMP_INFO(p_data, len)
+#define NRF_LOG_HEXDUMP_DEBUG(p_data, len)   NRF_LOG_INTERNAL_HEXDUMP_DEBUG(p_data, len)
+
+/**
+ * @brief Macro for logging hexdump without any prefix or timestamp.
+ */
+#define NRF_LOG_RAW_HEXDUMP_INFO(p_data, len) NRF_LOG_INTERNAL_RAW_HEXDUMP_INFO(p_data, len)
+
+/**
+ * @brief A macro for blocking reading from bidirectional backend used for logging.
+ *
+ * Macro call is blocking and returns when single byte is received.
+ */
+#define NRF_LOG_GETCHAR()                    NRF_LOG_INTERNAL_GETCHAR()
+
+/**
+ * @brief Function for copying a string to the internal logger buffer if logs are deferred.
+ *
+ * Use this function to store a string that is volatile (for example allocated
+ * on stack) or that may change before the deferred logs are processed. Such string is copied
+ * into the internal logger buffer and is persistent until the log is processed.
+ *
+ * @note If the logs are not deferred, then this function returns the input parameter.
+ *
+ * @param p_str Pointer to the user string.
+ *
+ * @return Address to the location where the string is stored in the internal logger buffer.
+ */
+uint32_t nrf_log_push(char * const p_str);
+
+/**
+ * @brief Macro to be used in a formatted string to a pass float number to the log.
+ *
+ * Macro should be used in formatted string instead of the %f specifier together with
+ * @ref NRF_LOG_FLOAT macro.
+ * Example: NRF_LOG_INFO("My float number" NRF_LOG_FLOAT_MARKER "\r\n", NRF_LOG_FLOAT(f)))
+ */
+#define NRF_LOG_FLOAT_MARKER "%s%d.%02d"
+
+/**
+ * @brief Macro for dissecting a float number into two numbers (integer and residuum).
+ */
+#define NRF_LOG_FLOAT(val) (uint32_t)(((val) < 0 && (val) > -1.0) ? "-" : ""),   \
+                           (int32_t)(val),                                       \
+                           (int32_t)((((val) > 0) ? (val) - (int32_t)(val)       \
+                                                : (int32_t)(val) - (val))*100)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_LOG_H_
+
+/** @} */