unleashed-firmware/lib/toolbox/hex.c

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#include "hex.h"
bool hex_char_to_hex_nibble(char c, uint8_t* nibble) {
if((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')) {
if((c >= '0' && c <= '9')) {
*nibble = c - '0';
} else if((c >= 'A' && c <= 'F')) {
*nibble = c - 'A' + 10;
} else {
*nibble = c - 'a' + 10;
}
return true;
} else {
return false;
}
}
bool hex_chars_to_uint8(char hi, char low, uint8_t* value) {
uint8_t hi_nibble_value, low_nibble_value;
if(hex_char_to_hex_nibble(hi, &hi_nibble_value) &&
hex_char_to_hex_nibble(low, &low_nibble_value)) {
*value = (hi_nibble_value << 4) | low_nibble_value;
return true;
} else {
return false;
}
}