Started following some tutorial on att85 usi. Downloaded example code from make avr book.

2022-09-20 01:08:01 -04:00
parent d0cbc0000e
commit 361a828c46
295 changed files with 68746 additions and 0 deletions
--- a/Examples/AVR-Programming-Library/binaryMacro.h
+++ b/Examples/AVR-Programming-Library/binaryMacro.h
@@ -0,0 +1,45 @@
+/* Binary constant generator macro
+By Tom Torfs - donated to the public domain
+*/
+
+/* All macro's evaluate to compile-time constants */
+
+/* *** helper macros *** /
+
+/* turn a numeric literal into a hex constant
+(avoids problems with leading zeroes)
+8-bit constants max value 0x11111111, always fits in unsigned long
+*/
+#define HEX__(n) 0x##n##LU
+
+/* 8-bit conversion function */
+#define B8__(x) ((x&0x0000000FLU)?1:0)	\
+((x&0x000000F0LU)?2:0)	\
+((x&0x00000F00LU)?4:0)	\
+((x&0x0000F000LU)?8:0)	\
+((x&0x000F0000LU)?16:0)	\
+((x&0x00F00000LU)?32:0)	\
+((x&0x0F000000LU)?64:0)	\
+((x&0xF0000000LU)?128:0)
+
+/* *** user macros *** /
+
+/* for upto 8-bit binary constants */
+#define B8(d) ((unsigned char)B8__(HEX__(d)))
+
+/* for upto 16-bit binary constants, MSB first */
+#define B16(dmsb,dlsb) (((unsigned short)B8(dmsb)<<8)	\
+ B8(dlsb))
+
+/* for upto 32-bit binary constants, MSB first */
+#define B32(dmsb,db2,db3,dlsb) (((unsigned long)B8(dmsb)<<24)	 \
+ ((unsigned long)B8(db2)<<16) \
+ ((unsigned long)B8(db3)<<8)	 \
+ B8(dlsb))
+
+/* Sample usage:
+B8(01010101) = 85
+B16(10101010,01010101) = 43605
+B32(10000000,11111111,10101010,01010101) = 2164238933
+*/
+