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Lead on, adventurer. Your quest awaits!
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Reged: 03/21/06
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Posts: 23
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Re: Need help with Cruis'n World driver
09/07/12 05:52 AM
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> question rises anyhow: why should those bits be counted from right to left? By
> convention?
0x0f for example mean that the first 4 bits are set (1) ane the last 4 are not (0), the first bit is the rightmost
> The code works and it's very clear: essentially you "flatten" all the 4 view bits
> (5th to 8th) to "1111" with viewval = (viewval | 0xf0) and then assign the zero to
> the desired view bit with viewval = viewval & 0xef for bit 5, and so on.
It's not the best looking one to see, but in this way it's easy to understand how it work 
> Any idea on what's wrong here?
In your code you never reset to 1 the "flag".
Code:
static READ32_HANDLER( port1_r )
{
static UINT8 cur_view = 0;
static UINT8 last_val = 0;
static UINT16 last_data = 0;
UINT16 viewval = readinputport(1); //total actual values stored in memory
UINT8 button_pressed = viewval & 0x0010;
if (last_val==button_pressed)
return ((last_data << 16) | last_data);
if (!button_pressed ) // check if button is pressed
{
cur_view++;
if (cur_view == 4)
cur_view = 0;
viewval = (viewval | 0xf0);
switch (cur_view){
case 0:
viewval = viewval & 0xef;
break;
case 1:
viewval = viewval & 0xdf;
break;
case 2:
viewval = viewval & 0xbf;
break;
case 3:
viewval = viewval & 0x7f;
break;
}
}
last_val=button_pressed;
last_data = viewval;
return (viewval << 16) | viewval;
}
this shoud work, as you can see I keep a copy of last input read and if it's the same I just return old value, if not i return new data and copy new data to my stored value.
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