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Add ASCII control codes #7

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Add ASCII control codes #7

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69 changes: 65 additions & 4 deletions src/hidboot.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@ uint8_t KeyboardReportParser::HandleLockingKeys(HID *hid, uint8_t key)
const uint8_t KeyboardReportParser::numKeys[] = { '!', '@', '#', '$', '%', '^', '&', '*', '(', ')' };
const uint8_t KeyboardReportParser::symKeysUp[] = { '_', '+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?' };
const uint8_t KeyboardReportParser::symKeysLo[] = { '-', '=', '[', ']', '\\', ' ', ';', '\'', '`', ',', '.', '/' };
const uint8_t KeyboardReportParser::padKeys[] = { '/', '*', '-', '+', 0x13 };
const uint8_t KeyboardReportParser::padKeys[] = { '/', '*', '-', '+', 0x0D };

/**
* \brief Manage keyboard OEM to ASCII conversion.
Expand All @@ -142,13 +142,34 @@ const uint8_t KeyboardReportParser::padKeys[] = { '/', '*', '-', '+', 0x13 };
*
* \return Keyboard corresponding ASCII value on success, 0 otherwise.
*/

/* Key modifier bit map.
* 0 LEFT CTRL
* 1 LEFT SHIFT
* 2 LEFT ALT
* 3 LEFT GUI
* 4 RIGHT CTRL
* 5 RIGHT SHIFT
* 6 RIGHT ALT
* 7 RIGHT GUI
*
* shift = (mod & 0x22) means shift is non-zero
* if either or both shift keys are active
* ctrl = (mod & 0x11) means ctrl is non-zero
* if either or both control keys are active
*/

uint8_t KeyboardReportParser::OemToAscii(uint8_t mod, uint8_t key)
{
uint8_t shift = (mod & 0x22);
uint8_t ctrl = (mod & 0x11);

// [a-z]
if (key > 0x03 && key < 0x1e)
{
// [^a-^z]
if (ctrl) return (key - 3);

// Upper case letters
if ( (kbdLockingKeys.kbdLeds.bmCapsLock == 0 && (mod & 2)) ||
(kbdLockingKeys.kbdLeds.bmCapsLock == 1 && (mod & 2) == 0) )
Expand All @@ -162,7 +183,17 @@ uint8_t KeyboardReportParser::OemToAscii(uint8_t mod, uint8_t key)
else if (key > 0x1d && key < 0x27)
{
if (shift)
return (numKeys[key - 0x1e]);
{
if (ctrl)
{
if (key == 0x23)
return (0x1E); /* RS ^^ */
else
return (0x00);
}
else
return (numKeys[key - 0x1e]);
}
else
return (key - 0x1e + '1');
}
Expand All @@ -173,15 +204,45 @@ uint8_t KeyboardReportParser::OemToAscii(uint8_t mod, uint8_t key)
return (key - 0x59 + '1');
}
else if (key > 0x2c && key < 0x39)
return ((shift) ? symKeysUp[key-0x2d] : symKeysLo[key-0x2d]);
{
if (shift)
{
if (ctrl)
{
if (key == 0x2d)
return (0x1F); /* US ^_ */
else
return (0x00);
}
else
return symKeysUp[key-0x2d];
}
else
{
if (ctrl)
switch (key)
{
case 0x2F: return 0x1B; /* ESC ^[ */
case 0x31: return 0x1C; /* FS ^\ */
case 0x30: return 0x1D; /* GS ^] */
default: return 0x00;
}
else
return symKeysLo[key-0x2d];
}
}
else if (key > 0x53 && key < 0x59)
return padKeys[key - 0x54];
else
{
switch (key)
{
case KEY_SPACE: return (0x20);
case KEY_ENTER: return (0x13);
case KEY_ENTER: return (0x0D);
case KEY_ESCAPE: return (0x1B);
case KEY_DELETE: return (0x08);
case KEY_DELETE_FORWARD: return (0x7F); // ASCII DEL
case KEY_TAB: return (0x09);
case KEY_ZERO: return ((shift) ? ')' : '0');
case KEY_ZERO2: return ((kbdLockingKeys.kbdLeds.bmNumLock == 1) ? '0' : 0);
case KEY_PERIOD: return ((kbdLockingKeys.kbdLeds.bmNumLock == 1) ? '.' : 0);
Expand Down
4 changes: 4 additions & 0 deletions src/hidboot.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,10 @@ e-mail : [email protected]
#define KEY_ZERO 0x27
#define KEY_ZERO2 0x62
#define KEY_ENTER 0x28
#define KEY_ESCAPE 0x29
#define KEY_DELETE 0x2A // Backspace
#define KEY_DELETE_FORWARD 0x4C // Delete
#define KEY_TAB 0x2B
#define KEY_PERIOD 0x63

/**
Expand Down