root / lab2 / utils.c @ 4
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1 | 3 | up20180645 | #include <lcom/lcf.h> |
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3 | #include <stdint.h> |
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4 | |||
5 | int(util_get_LSB)(uint16_t val, uint8_t *lsb) {
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6 | 4 | up20180645 | *lsb = (uint8_t) val; //truncation of 16 bit to 8 bit (maintains the LSB)
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7 | 3 | up20180645 | |
8 | 4 | up20180645 | return 0; |
9 | 3 | up20180645 | } |
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11 | int(util_get_MSB)(uint16_t val, uint8_t *msb) {
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12 | 4 | up20180645 | val= val>>8; //8 bit shift, gets rid of LSB |
13 | *msb=(uint8_t)val; //truncation of 16 bit to 8 bit (this time we have the MSB)
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14 | 3 | up20180645 | |
15 | 4 | up20180645 | return 0; |
16 | 3 | up20180645 | } |
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18 | 4 | up20180645 | int (util_sys_inb)(int port, uint8_t *value) { //transform 8 bit into 32 bit |
19 | 3 | up20180645 | |
20 | 4 | up20180645 | uint32_t new_val; //initializing 32 bit variable
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21 | |||
22 | if(sys_inb(port,&new_val)!=0){ //verifies if there is an error |
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23 | printf("Error in util_sys_inb\n");
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24 | return 1; |
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25 | } |
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26 | *value=new_val & 0xFF; // dereferencing "value" |
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27 | |||
28 | return 0; |
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29 | 3 | up20180645 | } |