FreeCalypso > hg > freecalypso-sw
annotate loadtools/hexdecode.c @ 992:a7b0b426f9ca
target-utils: boot ROM UART autodetection revamped
The new implementation should work with both the familiar Calypso C035
boot ROM version found in our regular targets as well as the older
Calypso F741979B version found on the vintage D-Sample board.
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
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date | Wed, 30 Dec 2015 21:28:41 +0000 |
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1 /* |
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2 * This module contains the decode_hex_byte() function, |
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3 * which is used by the SREC file reader and will likely be used |
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4 * by other code as well, such as the dump-to-file function |
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5 * of loadtool. |
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6 */ |
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7 |
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8 #include <ctype.h> |
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9 |
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10 decode_hex_byte(s) |
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11 char *s; |
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12 { |
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13 register int u, l; |
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14 |
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15 if (!isxdigit(s[0]) || !isxdigit(s[1])) |
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16 return(-1); |
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17 if (isdigit(s[0])) |
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18 u = s[0] - '0'; |
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19 else if (isupper(s[0])) |
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20 u = s[0] - 'A' + 10; |
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21 else |
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22 u = s[0] - 'a' + 10; |
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23 if (isdigit(s[1])) |
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24 l = s[1] - '0'; |
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25 else if (isupper(s[1])) |
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26 l = s[1] - 'A' + 10; |
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27 else |
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28 l = s[1] - 'a' + 10; |
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29 return((u << 4) | l); |
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30 } |