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led_7seg: Add a code comment for the mapping of bit positions to segments.

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This commit is contained in:
Keir Fraser 2023-04-19 12:55:33 +01:00
parent 484af134e6
commit 82aaae8bf5
1 changed files with 2 additions and 1 deletions
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3
src/display/led_7seg.c
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@ -24,7 +24,8 @@
static uint8_t DAT_PIN = 10;
static uint8_t CLK_PIN = 11;
/* TM1651, 74HC164: Alphanumeric segment arrangements. */
/* TM1651, 74HC164: Alphanumeric segment arrangements.
* Bit positions 0-6 correspond to conventional segment labels A-G resp. */
static const uint8_t letters[] = {
0x77, 0x7c, 0x58, 0x5e, 0x79, 0x71, 0x6f, 0x74, 0x04, /* a-i */
0x0e, 0x08, 0x38, 0x40, 0x54, 0x5c, 0x73, 0x67, 0x50, /* j-r */