From 861ed124caf5a403748c948b88afa4ef89cc1787 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sun, 11 Oct 2015 13:33:40 +0200
Subject: Add USART FILE interface

! NOT TESTED !
---
 src/usart.c | 32 +++++++++++++++++++++++++++++++-
 usart.h     | 11 +++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/usart.c b/src/usart.c
index 0e17aff..745d75c 100644
--- a/src/usart.c
+++ b/src/usart.c
@@ -117,7 +117,7 @@ void usart_send_str(char *str) {
 
 #ifdef _IOE_USART_INBUFFER
 uint8_t usart_get(void) {
-    uint8_t rtn = 0;
+    uint8_t rtn;
     IOEBUFFER_GET(_ioe_usart_inbuffer, CONFIG_IOE_USART_INBUFFER_SIZE,
                   rtn);
     return rtn;
@@ -150,6 +150,36 @@ uint8_t usart_outbuffered(void) {
 }
 #endif
 
+#ifdef CONFIG_IOE_USART_OUTFILE
+static int usartput(char c, FILE * f) {
+    usart_send((uint8_t) c);
+    return 0;
+}
+#endif
+
+#ifdef CONFIG_IOE_USART_INBUFFER
+static int usartget(FILE * f) {
+    uint8_t v;
+    while (!(v = usart_get()));
+    return v;
+}
+#endif
+
+#if (defined CONFIG_IOE_USART_INFILE) || (defined CONFIG_IOE_USART_OUTFILE)
+FILE *usart_async_open(void) {
+    usart_init_async();
+#ifdef CONFIG_IOE_USART_OUTFILE
+#ifdef CONFIG_IOE_USART_INFILE
+    return fdevopen(spiput, spiget);
+#else
+    return fdevopen(spiput, 0);
+#endif
+#else
+    return fdevopen(0, spiget);
+#endif
+}
+#endif
+
 ////// Interrupts ////////////////////////////////
 void (*usart_receive) (uint8_t data) = 0;
 void (*usart_sent) (void) = 0;
diff --git a/usart.h b/usart.h
index 3a06baf..04ed963 100644
--- a/usart.h
+++ b/usart.h
@@ -1,6 +1,7 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <stdint.h>
+#include <stdio.h>
 
 #include "mcu/mcu_def.h"
 #include "buffers.h"
@@ -51,6 +52,13 @@ enum usartDataBits {
 #define USART_DATAOVERRUN _BV(DOR0)
 #define USART_PARITYERROR _BV(UPE0)
 
+#if (defined CONFIG_IOE_USART_INFILE) && (CONFIG_IOE_USART_INBUFFER_SIZE <= 0)
+#error "USART Input file can't be enabled without input buffer"
+#endif
+#if (defined CONFIG_IOE_USART_OUTFILE) && (CONFIG_IOE_USART_OUTBUFFER_SIZE <= 0)
+#error "USART Input file can't be enabled without output buffer"
+#endif
+
 #if CONFIG_IOE_USART_INBUFFER_SIZE > 0
 #define _IOE_USART_INBUFFER
 volatile IOEBUFFER(_ioe_usart_inbuffer, CONFIG_IOE_USART_INBUFFER_SIZE);
@@ -85,6 +93,9 @@ uint8_t usart_inbuffered(void);
 #ifdef _IOE_USART_OUTBUFFER
 uint8_t usart_outbuffered(void);
 #endif
+#if (defined CONFIG_IOE_USART_INFILE) || (defined CONFIG_IOE_USART_OUTFILE)
+FILE *spi_open(void);
+#endif
 
 // Following function must be user defined if relevant buffers not used.
 extern void (*usart_receive)(uint8_t data);
-- 
cgit v1.2.3