Henry-Hiles/qmk_userspace
1
0
Fork 0
forked from mirrors/qmk_userspace
Code Pull requests Activity

output previous key state on TP1684 when scaning matrix.

Browse source
This commit is contained in:
tmk 2010-11-06 01:58:47 +09:00
parent 89feab2301
commit 2ca3ab18a2
2 changed files with 31 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

17
hhkb/doc/HHKB.txt
View file

@ -84,7 +84,7 @@ Two PCBs are connected by 15 lines. Vcc and GND use 3 lines each, other 9 lines
2 Vcc(5V)
3 Vcc(5V)
4 TP1684 KEY: Low(0) when key pressed PE6 input(with pullup)
5 TP1684 unknown:how to use PE7 input(with pullup)
5 TP1684 KEY_PREV: assert previous key state??? PE7 output
6 HC4051 A(bit0) select 8 rows(0 to 7) PB0 output
7 HC4051 B(bit1) PB1 output
8 HC4051 C(bit2) PB2 output
@ -148,9 +148,11 @@ Signals charts:
(HHKB_chart1.jpg)
Space bar locate at ROW:3 COL:7. Key are selected by HC4051(C,B,A) and LS145(C,B,A).
Space bar locate at ROW:3 COL:7. A key is selected by HC4051(C,B,A) and LS145(C,B,A).
Key state can be read on TP1684(4/KEY) while asserting low on LS145(D).
Usage of TP1684(5) is unknown. Key state can be read without using this signal.
Usage of TP1684(5) is not clear. Controller seemed to output previous key state on this line.
However key state can be read without using this signal.
(HHKB_chart2.jpg)
@ -162,7 +164,13 @@ Matrix scan pseudo code:
for (col: 0-7) {
SELECT_COL(col); // set LS145(A,B,C)
_delay_us(50);
_delay_us(40);
if (prev_key_state(row, col)) {
KEY_PREV_ON;
}
_delay_us(7);
ENALBLE_COL(); // set LS145(D) to low
@ -174,6 +182,7 @@ Matrix scan pseudo code:
// not pressed
}
KEY_PREV_OFF;
UNALBLE_COL(); // set LS145(D) to high
_delay_us(150);