basic usart skeleton

utils/ini_writer.c

@@ -98,3 +98,10 @@ uint32_t iw_measure_total(void (*handler)(IniWriter *))
     handler(&iw);
     return 0xFFFFFFFF - iw.skip;
 }
+
+
+
+void iw_cmt_newline(IniWriter *iw)
+{
+    if (SystemSettings.ini_comments) iw_newline(iw);
+}

utils/ini_writer.h

@@ -45,10 +45,9 @@ static inline void iw_string(IniWriter *iw, const char *str)
     }
 }
 
+void iw_cmt_newline(IniWriter *iw);
 #define iw_newline(iw) iw_string(iw, "\r\n")
-#define iw_cmt_newline(iw) do { \
-    if (SystemSettings.ini_comments) iw_string(iw, "\r\n"); \
-} while (0)
+
 
 /**
  * Try to snprintf to the file

utils/str_utils.h

@@ -110,6 +110,21 @@ uint8_t str_parse_012(const char *str, const char *a, const char *b, const char
 /** Convert bool to one of two options */
 #define str_01(cond, a, b) ((cond) ? (b) : (a))
 
+/** Convert number to one of three options */
+#define str_3(cond, na, a, nb, b, nc, c) (\
+    ((cond)==(na)) ? (a) : \
+    ((cond)==(nb)) ? (b) : \
+    (c) \
+)
+
+/** Convert number to one of three options */
+#define str_4(cond, na, a, nb, b, nc, c, nd, d) (\
+    ((cond)==(na)) ? (a) : \
+    ((cond)==(nb)) ? (b) : \
+    ((cond)==(nc)) ? (c) : \
+    (d) \
+)
+
 /** Convert bool to Y or N */
 #define str_yn(cond) ((cond) ? ("Y") : ("N"))