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