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make LETTTER_OFF return values that match param indices range

Bob-the-Kuhn 8 years ago
parent
cd2ac3b759
commit
e6e3132f79
1 changed files with 1 additions and 1 deletions
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  1. 1
    1
      Marlin/gcode.h

+ 1
- 1
Marlin/gcode.h View File

104 
   // Index so that 'X' falls on index 24
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   // Index so that 'X' falls on index 24
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   #define PARAM_IND(N)  ((N) >> 3)
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   #define PARAM_IND(N)  ((N) >> 3)
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   #define PARAM_BIT(N)  ((N) & 0x7)
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   #define PARAM_BIT(N)  ((N) & 0x7)
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-  #define LETTER_OFF(N) ((N) - 'A' + 1)
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+  #define LETTER_OFF(N) ((N) - 'A')
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   #define LETTER_IND(N) PARAM_IND(LETTER_OFF(N))
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   #define LETTER_IND(N) PARAM_IND(LETTER_OFF(N))
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   #define LETTER_BIT(N) PARAM_BIT(LETTER_OFF(N))
 109 
   #define LETTER_BIT(N) PARAM_BIT(LETTER_OFF(N))
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110

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