Wait for two ticks rather than 1
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			@ -69,7 +69,7 @@ uint8_t matrix_scan(void)
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            case 8: palSetPad(GPIOC, 11);   break;
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        }
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        wait_us(10); // need wait to settle pin state
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        wait_us(20); // need wait to settle pin state
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        // read col data: { PTD0, PTD1, PTD4, PTD5, PTD6, PTD7, PTC1, PTC2 }
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        data = ((palReadPort(GPIOC) & 0x06UL) << 5) |
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