root / lab2 / utils.c @ 23
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| 1 | 4 | up20180655 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include <stdint.h> |
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| 4 | |||
| 5 | 20 | up20180655 | /* Byte Masks */
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| 6 | #define LSB 0xFF /**< @brief mask to filter least significant byte */ |
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| 7 | |||
| 8 | 4 | up20180655 | int(util_get_LSB)(uint16_t val, uint8_t *lsb) {
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| 9 | 20 | up20180655 | if (lsb == NULL) return 1; |
| 10 | 4 | up20180655 | |
| 11 | 20 | up20180655 | *lsb = val & LSB; |
| 12 | 7 | up20180655 | return 0; |
| 13 | 4 | up20180655 | } |
| 14 | |||
| 15 | int(util_get_MSB)(uint16_t val, uint8_t *msb) {
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| 16 | 20 | up20180655 | if (msb == NULL) return 1; |
| 17 | 7 | up20180655 | *msb = val >> 8;
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| 18 | return 0; |
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| 19 | 4 | up20180655 | } |
| 20 | |||
| 21 | int (util_sys_inb)(int port, uint8_t *value) { |
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| 22 | 8 | up20180642 | if(value == NULL) return 1; |
| 23 | 5 | up20180642 | uint32_t n = 0;
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| 24 | 9 | up20180642 | if(sys_inb(port, &n)) return 1; |
| 25 | 20 | up20180655 | *value = n & LSB; |
| 26 | 9 | up20180642 | return 0; |
| 27 | 4 | up20180655 | } |