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defines.h: add commented out three segment N

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While I know of seven segment displays that use
     _
    | |

as 'N', ssocr detects the size of the individual seven segment
displays and thus always sees this as

     _
    | |
    | |

unless the digit boundary detection fails.

This commit is intended as a reminder for me that I have already
thought about this issue.
This commit is contained in:
Erik Auerswald
2021-07-11 17:56:42 +02:00
parent 00846d5dd3
commit cce3f196f8
1 changed files with 1 additions and 0 deletions
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defines.h
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@@ -87,6 +87,7 @@
#define D_R (D_ZERO & ~(VERT_RIGHT_DOWN | HORIZ_DOWN))
#define D_P (D_HEX_F | VERT_RIGHT_UP)
#define D_N (D_ZERO & ~HORIZ_DOWN)
/* an N in the lower half can only happen when digit boundary detection fails *//* define D_LOW_N (VERT_LEFT_DOWN | VERT_RIGHT_DOWN | HORIZ_MID) */
#define D_UNKNOWN 0
#define NUMBER_OF_DIGITS 6 /* in this special case */