logging: add frontend API

Custom frontend API added.

Signed-off-by: Marcin Szymczyk <Marcin.Szymczyk@nordicsemi.no>

include/logging/log_frontend.h

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2019 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef LOG_FRONTEND_H_
+#define LOG_FRONTEND_H_
+
+#include <logging/log_core.h>
+
+/** @brief Initialize frontend.
+ */
+void log_frontend_init(void);
+
+/** @brief Standard log with no arguments.
+ *
+ * @param str		String.
+ * @param src_level	Log identification.
+ */
+void log_frontend_0(const char *str, struct log_msg_ids src_level);
+
+/** @brief Standard log with one argument.
+ *
+ * @param str		String.
+ * @param arg0		First argument.
+ * @param src_level	Log identification.
+ */
+void log_frontend_1(const char *str,
+		    log_arg_t arg0,
+		    struct log_msg_ids src_level);
+
+/** @brief Standard log with two arguments.
+ *
+ * @param str		String.
+ * @param arg0		First argument.
+ * @param arg1		Second argument.
+ * @param src_level	Log identification.
+ */
+void log_frontend_2(const char *str,
+		    log_arg_t arg0,
+		    log_arg_t arg1,
+		    struct log_msg_ids src_level);
+
+/** @brief Standard log with three arguments.
+ *
+ * @param str		String.
+ * @param arg0		First argument.
+ * @param arg1		Second argument.
+ * @param arg2		Third argument.
+ * @param src_level	Log identification.
+ */
+void log_frontend_3(const char *str,
+		    log_arg_t arg0,
+		    log_arg_t arg1,
+		    log_arg_t arg2,
+		    struct log_msg_ids src_level);
+
+/** @brief Standard log with arguments list.
+ *
+ * @param str		String.
+ * @param args		Array with arguments.
+ * @param narg		Number of arguments in the array.
+ * @param src_level	Log identification.
+ */
+void log_frontend_n(const char *str,
+		    log_arg_t *args,
+		    u32_t narg,
+		    struct log_msg_ids src_level);
+
+/** @brief Hexdump log.
+ *
+ * @param str		String.
+ * @param data		Data.
+ * @param length	Data length.
+ * @param src_level	Log identification.
+ */
+void log_frontend_hexdump(const char *str,
+			  const u8_t *data,
+			  u32_t length,
+			  struct log_msg_ids src_level);
+
+
+#endif /* LOG_FRONTEND_H_ */