root / lab2 / utils.h @ 8
History | View | Annotate | Download (1007 Bytes)
| 1 | 7 | up20180645 | #pragma once
|
|---|---|---|---|
| 2 | |||
| 3 | /** @defgroup utils utils
|
||
| 4 | * @{
|
||
| 5 | *
|
||
| 6 | * LCOM's utility functions
|
||
| 7 | */
|
||
| 8 | |||
| 9 | #include <stdint.h> |
||
| 10 | |||
| 11 | #ifndef BIT
|
||
| 12 | # define BIT(n) (1 << (n)) |
||
| 13 | #endif
|
||
| 14 | |||
| 15 | /**
|
||
| 16 | * @brief Returns the LSB of a 2 byte integer
|
||
| 17 | *
|
||
| 18 | * @param val input 2 byte integer
|
||
| 19 | * @param lsb address of memory location to be updated with val's LSB
|
||
| 20 | * @return Return 0 upon success and non-zero otherwise
|
||
| 21 | */
|
||
| 22 | int (util_get_LSB)(uint16_t val, uint8_t *lsb);
|
||
| 23 | |||
| 24 | /**
|
||
| 25 | * @brief Returns the MSB of a 2 byte integer
|
||
| 26 | *
|
||
| 27 | * @param val input 2 byte integer
|
||
| 28 | * @param msb address of memory location to be updated with val's LSB
|
||
| 29 | * @return Return 0 upon success and non-zero otherwise
|
||
| 30 | */
|
||
| 31 | int (util_get_MSB)(uint16_t val, uint8_t *msb);
|
||
| 32 | |||
| 33 | /**
|
||
| 34 | * @brief Invokes sys_inb() system call but reads the value into a uint8_t variable.
|
||
| 35 | *
|
||
| 36 | * @param port the input port that is to be read
|
||
| 37 | * @param value address of 8-bit variable to be update with the value read
|
||
| 38 | * @return Return 0 upon success and non-zero otherwise
|
||
| 39 | */
|
||
| 40 | int (util_sys_inb)(int port, uint8_t *value); |