Nut/OS is a small real time operating system aimed at 8-bit CPUs.
It supports the following features:
A reasonably large hardware resource might be:
Modules | |
| Thread Management | |
| Coperative multi-threading support. | |
| Thread States | |
| Thread operating states. | |
| Event Management | |
| Thread synchronization support. | |
| Heap Management | |
| Dynamic memory management. | |
| Banked Memory Management | |
| Banked RAM support. | |
| I/O Management | |
| Input and output device functions. | |
| Device I/O | |
| Input and output device functions. | |
| Timer Management | |
| Asynchronous timer support. | |
Defines | |
| #define | __byte_swap2(val) |
| #define | __byte_swap4(val) |
| #define | htonl(x) __byte_swap4(x) |
| Convert long value from host to network byte order. | |
| #define | htons(x) __byte_swap2(x) |
| Convert short value from host to network byte order. | |
| #define | ntohl(x) __byte_swap4(x) |
| Convert long value from network to host byte order. | |
| #define | ntohs(x) __byte_swap2(x) |
| Convert short value from network to host byte order. | |
| #define | NUTMEM_ALIGNMENT sizeof(int) |
| #define | NUTMEM_BOTTOM_ALIGN(s) ((s) & ~(NUTMEM_ALIGNMENT - 1)) |
| Return the next lower aligned value. | |
| #define | NUTMEM_TOP_ALIGN(s) NUTMEM_BOTTOM_ALIGN((s + (NUTMEM_ALIGNMENT - 1))) |
| Return the next higher aligned value. | |
Typedefs | |
| typedef void * | HANDLE |
| Void pointer. | |
| typedef unsigned short | reg_t |
| Signed register type. | |
| typedef unsigned char | u_char |
| Unsigned 8-bit value. | |
| typedef unsigned int | u_int |
| Unsigned int value. | |
| typedef unsigned long | u_long |
| Unsigned 32-bit value. | |
| typedef unsigned long long | u_longlong |
| Unsigned 64-bit value. | |
| typedef unsigned short | u_short |
| Unsigned 16-bit value. | |
| typedef unsigned int | uptr_t |
| Unsigned pointer value type. | |
| typedef unsigned short | ureg_t |
| Unsigned register type. | |
| #define __byte_swap2 | ( | val | ) |
Value:
((((val) & 0xff) << 8) | \
(((val) & 0xff00) >> 8))
| #define __byte_swap4 | ( | val | ) |
Value:
((((val) & 0xff) << 24) | \
(((val) & 0xff00) << 8) | \
(((val) & 0xff0000) >> 8) | \
(((val) & 0xff000000) >> 24))
| typedef unsigned short reg_t |
Signed register type.
Similar to ureg_t, but for signed values from -128 to +127.
| typedef unsigned char u_char |
Unsigned 8-bit value.
| typedef unsigned int uptr_t |
Unsigned pointer value type.
The size of this type is at least the size of a memory pointer. For CPUs with 16 address bits this will be an unsigned short.
| typedef unsigned short ureg_t |
Unsigned register type.
The size of this type is equal to the size of a register, the hardware datapath or whatever might fit to give optimum performance for values from 0 to 255.
Typically 8 bit CPUs will use unsigned characters, 16 bit CPUs will use unsigned shorts etc.
1.5.1