28 lines
682 B
C
28 lines
682 B
C
#include <stdint.h>
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// hex to binary/byte decoding
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uint8_t htob(uint16_t hex)
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{
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uint8_t low_hex = (uint8_t) hex;
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uint8_t high_hex = (uint8_t) (hex >> 8);
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uint8_t byte;
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byte = (high_hex > 0x40) ? (high_hex & 0x0F) + 9 : high_hex & 0x0F;
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byte = byte << 4;
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byte |= (low_hex > 0x40) ? (low_hex & 0x0F) + 9 : low_hex & 0x0F;
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return byte;
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}
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// binary/byte to hex encoding
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uint16_t btoh(uint8_t byte)
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{
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uint8_t low_nibble = (byte & 0x0F);
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uint8_t high_nibble = (byte & 0xF0) >> 4;
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uint16_t hex;
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hex = (high_nibble > 0x09) ? high_nibble - 9 + 0x60 : high_nibble + 0x30;
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hex = hex << 8;
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hex |= (low_nibble > 0x09) ? low_nibble - 9 + 0x60 : low_nibble + 0x30;
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return hex;
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}
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