From 71f4355523bfcd350befa5d01826f990a90a83df Mon Sep 17 00:00:00 2001
From: bernie <bernie@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 16 Feb 2005 20:28:28 +0000
Subject: [PATCH] Macros for program memory access.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@368 38d2e660-2303-0410-9eaa-f027e97ec537
---
 mware/pgm.h | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100755 mware/pgm.h

diff --git a/mware/pgm.h b/mware/pgm.h
new file mode 100755
index 00000000..dcce64da
--- /dev/null
+++ b/mware/pgm.h
@@ -0,0 +1,130 @@
+/*!
+ * \file
+ * <!--
+ * Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2004 Giovanni Bajo
+ * This file is part of DevLib - See README.devlib for information.
+ * -->
+ *
+ * \brief Support for reading program memory on Harvard architectures.
+ *
+ * Support is currently provided for AVR microcontrollers only.
+ *
+ * These macros allow building code twice, with and without
+ * pgm support (e.g.: strcpy() and strcpy_P()).
+ *
+ * Set the _PROGMEM predefine to compile in conditional
+ * program-memory support.
+ *
+ *
+ * \note This module contains code ripped out from avr-libc,
+ *       which is distributed under a 3-clause BSD license.
+ */
+#ifndef MWARE_PGM_H
+#define MWARE_PGM_H
+
+#include <cpu_detect.h>
+
+#if CPU_AVR
+
+	#ifdef __AVR_ENHANCED__
+		#define pgm_read_char(addr) \
+		({ \
+			uint16_t __addr16 = (uint16_t)(addr); \
+			uint8_t __result; \
+			__asm__ \
+			( \
+				"lpm %0, Z" "\n\t" \
+				: "=r" (__result) \
+				: "z" (__addr16) \
+			); \
+			__result; \
+		})
+	#else
+		#define pgm_read_char(addr) \
+		({ \
+			uint16_t __addr16 = (uint16_t)(addr); \
+			uint8_t __result; \
+			__asm__ \
+			( \
+				"lpm" "\n\t" \
+				"mov %0, r0" "\n\t" \
+				: "=r" (__result) \
+				: "z" (__addr16) \
+				: "r0" \
+			); \
+			__result; \
+		})
+	#endif
+
+	#define PROGMEM  __attribute__((__progmem__))
+	#define PSTR(s) ({static const char __c[] PROGMEM = (s); __c;})
+
+#elif CPU_HARVARD
+	#error Missing CPU support
+#endif
+
+#ifndef PSTR
+#define PSTR            /* nothing */
+#endif
+
+#ifndef PROGMEM
+#define PROGMEM                /* nothing */
+#endif
+
+/*!
+ * \name Types for variables stored in program memory (harvard processors).
+ * \{
+ */
+typedef PROGMEM char pgm_char;
+typedef PROGMEM int8_t pgm_int8_t;
+typedef PROGMEM uint8_t pgm_uint8_t;
+typedef PROGMEM int16_t pgm_int16_t;
+typedef PROGMEM uint16_t pgm_uint16_t;
+typedef PROGMEM int32_t pgm_int32_t;
+typedef PROGMEM uint32_t pgm_uint32_t;
+/*\}*/
+
+/*!
+ * \def PGM_READ_CHAR
+ * \def PGM_FUNC
+ * \def PGM_ATTR
+ *
+ * These macros enable dual compilation of code for both program
+ * and data memory.
+ *
+ * Such a function may be defined like this:
+ *
+ * \code
+ *	void PGM_FUNC(lcd_puts)(PGM_ATTR const char *str)
+ *	{
+ *		char c;
+ *		while ((c = PGM_READ_CHAR(str++))
+ *			lcd_putchar(c);
+ *	}
+ * \endcode
+ *
+ * The above code can be compiled twice: once with the _PROGMEM preprocessor
+ * symbol defined, and once without.  The two object modules can then be
+ * linked in the same application for use by client code:
+ *
+ * \code
+ *	lcd_puts("Hello, world!");
+ *	lcd_puts_P(PSTR("Hello, world!"));
+ *
+ *	// To be used when invoking inside other PGM_FUNC functions:
+ *	PGM_FUNC(lcd_puts)(some_string);
+ * \endcode
+ */
+#ifdef _PROGMEM
+	#define PGM_READ_CHAR(s) pgm_read_char(s)
+	#define PGM_FUNC(x)      x ## _P
+	#define PGM_ATTR         PROGMEM
+#else
+	#define PGM_READ_CHAR(s) (*(s))
+	#define PGM_FUNC(x)      x
+	#define PGM_ATTR         /* nothing */
+#endif
+
+
+#endif /* MWARE_PGM_H */
-- 
2.25.1