add F103 PL2303 with ring buffer

F1:F103/PL2303_ringbuffer/usart.h

@@ -0,0 +1,54 @@
+/*
+ * usart.h
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __USART_H__
+#define __USART_H__
+
+// input and output buffers size
+#define UARTBUFSZI  (16)
+#define UARTBUFSZO  (32)
+
+// macro for static strings
+#define USEND(str) usart_send(str)
+
+#ifdef EBUG
+#define x__(a) #a
+#define STR(a) x__(a)
+#define DBG(str)  do{usart_send(__FILE__ " (L" STR(__LINE__) "): " str); \
+    usart_putchar('\n'); usart_transmit(); }while(0)
+#else
+#define DBG(str)
+#endif
+
+
+#define usartrx()  (usart_linerdy)
+#define usartovr() (usart_bufovr)
+
+extern volatile int usart_linerdy, usart_bufovr, usart_txrdy;
+
+void usart_transmit();
+void usart_setup();
+int usart_getline(char **line);
+void usart_send(const char *str);
+void usart_putchar(const char ch);
+
+#endif // __USART_H__