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2
keyboards/handwired/dqz11n1g/matrix.c
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@ -38,7 +38,7 @@ void matrix_init_custom(void) {
/* columns read via shift-register on SPI lines */
/* Enable SPI, Master, set clock rate fck/2. First bit already at Qh
/* Enable SPI, Master, set clock rate fck/16. First bit already at Qh
* output before clock edge (CPHA=0). SN74HC165 shift register shifts
* on low-to-high transition (CPOL=1). Receive the LSB first (DORD=1).
*/

20
keyboards/handwired/dqz11n1g/readme.md
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@ -2,24 +2,26 @@
![DQz11N1G](https://u.cubeupload.com/ddklg/OPBN5q.jpg)
Firmware for a DIY controller replacement for one of the ortholinear contoured
keyboards manufactured by [PCD Maltron Ltd](https://www.maltron.com)
Using QMK with one of the ortholinear contoured keyboards manufactured by [PCD
Maltron Ltd](https://www.maltron.com) by modding it with a DIY replacement
controller.
This work here in no way officially associated with PCD Maltron Ltd and comes
with NO WARRANTY. Modifying your Maltron keyboard as described below will
certainly void your warranty and may cause damage to your keyboard. Proceed
at your own risk!
with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.
Modifying your Maltron keyboard as described below will certainly void your
warranty and may e.g. cause damage to your keyboard. Proceed at your own risk!
* maintainer: [David Kuehling](https://github.com/dvdkhlng/qmk_firmware_dqz11n1g)
* Hardware Supported: Maltron DQz11N1G with a replacement controller board
assembled as described below. The work here is based on a german version
assembled as described below. The work here is based on a German version
of the keyboard: DQz11N1G-DE. I assume, but don't know for sure, that
minor or no changes at all are required to make this work on different
language versions of the keyboard.
* Hardware Availability:
* [PCD Maltron Ltd](https://www.maltron.com), for the original keyboard
* 1x [Arduino Pro Micro](https://www.sparkfun.com/products/12640)
* 3x [SN74HC165](https://www.ti.com/product/SN74HC165)
* 3x shift register [SN74HC165](https://www.ti.com/product/SN74HC165)
* 3x ceramic blocking capacitors (100 nF) one for each shift register
* 1x DIL connector 2 rows a 17 pins.
* 19x pull-down resistors (10k Ohm),
* 4 LED current limiting resistors (not sure about the correct resistance,
@ -31,7 +33,7 @@ Make example for this keyboard (after setting up your build environment):
## In Detail
[PCD Maltron Ltd](https://www.maltron.com) manufacturs ergonomic keyboards
[PCD Maltron Ltd](https://www.maltron.com) manufactures ergonomic keyboards
that appear to be hand-wired internally. For the Maltron DQz11N1G-DE
keyboard that I happen to own, the keyboard matrix is wired to a 34-pin DIL
connector. This makes it rather easy to replace the proprietary
@ -57,7 +59,7 @@ board which is still easy to source.
Unfortunately pin-count of the DQz11N1G-DE's keyboard matrix is way beyond
the Pro Micro's available I/O pin count. I'm using three 8-bit
shift-registers ([SN74HC165](https://www.ti.com/product/SN74HC165) ) to
connect the 19 colums of the keyboard matrix for readout. Due to diode
connect the 19 columns of the keyboard matrix for readout. Due to diode
direction in DQz11N1G-DE we also need 19 pull-down resistors one for each of
the utilized shift-register inputs.