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-rw-r--r--quantum/logging/sendchar.h33
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diff --git a/quantum/logging/sendchar.h b/quantum/logging/sendchar.h
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+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int8_t (*sendchar_func_t)(uint8_t c);
+
+/* transmit a character. return 0 on success, -1 on error. */
+int8_t sendchar(uint8_t c);
+
+#ifdef __cplusplus
+}
+#endif