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@ -207,14 +207,28 @@ void Model01::rebootBootloader() {
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// happens before the watchdog reboots us
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}
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// In the maskKey(), unMaskKey(), and isKeyMasked() functions, we read and write bits in
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// two bitfields -- one for each half of the keyboard. The fourth bit of the column number
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// tells us which bitfield (right or left) to access, thus the "8" (B00001000). The row
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// number tells us which element of the array to access. The last three bits of the column
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// number tell us which of the eight bits to access, thus the "7" (B00000111), and we
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// shift a bit starting from the left (B10000000, or 128) by that many places to get
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// there. This is all nice and convenient because the keyboard has 64 keys, in symmetric
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// halves, with eight keys per logical row.
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constexpr byte HIGH_BIT = B10000000;
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constexpr byte HAND_BIT = B00001000;
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constexpr byte ROW_BITS = B00110000;
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constexpr byte COL_BITS = B00000111;
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void Model01::maskKey(byte row, byte col) {
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if (row >= ROWS || col >= COLS)
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return;
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if (col >= 8) {
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rightHandMask.rows[row] |= 1 << (7 - (col - 8));
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if (col & HAND_BIT) {
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rightHandMask.rows[row] |= (HIGH_BIT >> (col & COL_BITS));
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} else {
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leftHandMask.rows[row] |= 1 << (7 - col);
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leftHandMask.rows[row] |= (HIGH_BIT >> (col & COL_BITS));
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}
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}
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@ -222,10 +236,10 @@ void Model01::unMaskKey(byte row, byte col) {
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if (row >= ROWS || col >= COLS)
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return;
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if (col >= 8) {
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rightHandMask.rows[row] &= ~(1 << (7 - (col - 8)));
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if (col & HAND_BIT) {
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rightHandMask.rows[row] &= ~(HIGH_BIT >> (col & COL_BITS));
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} else {
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leftHandMask.rows[row] &= ~(1 << (7 - col));
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leftHandMask.rows[row] &= ~(HIGH_BIT >> (col & COL_BITS));
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}
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}
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@ -233,10 +247,10 @@ bool Model01::isKeyMasked(byte row, byte col) {
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if (row >= ROWS || col >= COLS)
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return false;
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if (col >= 8) {
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return rightHandMask.rows[row] & (1 << (7 - (col - 8)));
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if (col & HAND_BIT) {
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return rightHandMask.rows[row] & (HIGH_BIT >> (col & COL_BITS));
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} else {
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return leftHandMask.rows[row] & (1 << (7 - col));
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return leftHandMask.rows[row] & (HIGH_BIT >> (col & COL_BITS));
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}
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}
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