HTEB1
User manual
if (data & mask) pcnt++; mask >>= 1;
}
if ((pcnt & 0x01) ^ (data & 0x0100)) return TRUE; return FALSE;
}
interrupt [IRQ_2] void IRQ_2_Isr(void) | // irq on key_clk | |
{ |
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static u8 cnt; |
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static u16 val; |
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if (outact) | /* do some output? */ | |
{ |
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if (outval & 0x0001) PDR1 = cKEYDATA; |
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else PDR1 &= ~cKEYDATA; |
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outval >>= 1; |
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if (!outval) |
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{ |
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PDR1 = cKEYDATA; |
| // set out=HIGH (1) |
PCR1 &= ~cKEYDATA; |
| // set portpin as input (0) |
outact=0; |
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} |
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} |
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else |
| // process input data |
{ |
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val >>= 1;
if (PDR1 & cKEYDATA) val = 0x0200; cnt++;
if (cnt>=11)
{
if (OddParStopCheck(val)==TRUE)
{
KeyCodeBuf[keyWriteIndex] = val; keyWriteIndex++;
if (keyWriteIndex >= cKeyBufSize) keyWriteIndex = 0; cnt = 0;
val = 0;
} |
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} |
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} |
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IRR1 &= ~0x04; | // clear | |
} |
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void SendKeyBoard(u8 data) | // send data to keyboard | |
{ |
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u8 pcnt = 0; |
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u8 mask = 0x80; |
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outval = data 0x0600; | // stopbit + clkbit(internal) | |
while (mask) | // calculate odd parity | |
{ |
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if (mask & data) pcnt++; |
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mask >>= 1; |
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} |
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if (!(pcnt & 0x01)) outval = 0x0100; | // set parity bit | |
PDR1 &= ~cKEYDATA; | // set data=LOW | |
PCR1 = cKEYDATA; |
| // set as output(1) |
outact = 1; | // start output action | |
} |
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u8 kbhit(void)
{
if (keyReadIndex != keyWriteIndex) return TRUE; else return FALSE;
}
u16 GetKey(void)
{
u16 KeyCode;
KeyCode = KeyCodeBuf[keyReadIndex];
Issue 0.2 | Page 46 | 07/2002 |
