BLAHAJ
/
libsigrok
10
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

libsigrok-internal.h: endian neutral helper macro to write 8/16/32 bits integer to unaligned memory

This commit is contained in:
Aurelien Jacobs 2014-02-02 21:33:09 +01:00 committed by Uwe Hermann
parent a4f9c35b23
commit ea2d6d994f
1 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
libsigrok-internal.h
View File

@ -93,6 +93,49 @@
((unsigned)((const uint8_t*)(x))[1] << 8) | \
(unsigned)((const uint8_t*)(x))[0])
/**
* Write a 8 bits integer to memory.
* @param p a pointer to the output memory
* @param x the input integer
*/
#define W8(p, x) do { ((uint8_t*)(p))[0] = (uint8_t) (x); } while(0)
/**
* Write a 16 bits integer to memory stored as big endian.
* @param p a pointer to the output memory
* @param x the input integer
*/
#define WB16(p, x) do { ((uint8_t*)(p))[1] = (uint8_t) (x); \
((uint8_t*)(p))[0] = (uint8_t)((x)>>8); } while(0)
/**
* Write a 16 bits integer to memory stored as little endian.
* @param p a pointer to the output memory
* @param x the input integer
*/
#define WL16(p, x) do { ((uint8_t*)(p))[0] = (uint8_t) (x); \
((uint8_t*)(p))[1] = (uint8_t)((x)>>8); } while(0)
/**
* Write a 32 bits integer to memory stored as big endian.
* @param p a pointer to the output memory
* @param x the input integer
*/
#define WB32(p, x) do { ((uint8_t*)(p))[3] = (uint8_t) (x); \
((uint8_t*)(p))[2] = (uint8_t)((x)>>8); \
((uint8_t*)(p))[1] = (uint8_t)((x)>>16); \
((uint8_t*)(p))[0] = (uint8_t)((x)>>24); } while(0)
/**
* Write a 32 bits integer to memory stored as little endian.
* @param p a pointer to the output memory
* @param x the input integer
*/
#define WL32(p, x) do { ((uint8_t*)(p))[0] = (uint8_t) (x); \
((uint8_t*)(p))[1] = (uint8_t)((x)>>8); \
((uint8_t*)(p))[2] = (uint8_t)((x)>>16); \
((uint8_t*)(p))[3] = (uint8_t)((x)>>24); } while(0)
/* Portability fixes for FreeBSD. */
#ifdef __FreeBSD__
#define LIBUSB_CLASS_APPLICATION 0xfe