[Keyboard] Added D48 keyboard.

keyboards/handwired/d48/README.md

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+# D48
+
+![Proton C based handwired 40% keyboard](https://i.imgur.com/2wCYuno.jpg)
+
+A Proton C based handwired 48 key keyboard with 2 rotary encoders, I2C OLED, WS2812 strip, buzzer & clock!
+
+- Keyboard Maintainer: Andrew Dunai
+- Hardware Supported: Proton C handwired
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/d48:default
+
+## Details
+
+- Proton C based handwired keyboard
+- 2x custom 1.25mm stainless steel plates
+- Kailh Choc White (clicky)
+- 2x rotary encoders
+- 0.91" 128x32 I<sup>2</sup>C OLED
+- Small buzzer mounted inside (still waiting for the AST1109MLTRQ boys)
+- WS2812 strip (14 LEDs)
+- DS1307 I<sup>2</sup>C module real-time clock
+
+Build process: [album](https://imgur.com/gallery/zZZGdDw)
+
+## Pinout
+
+![D48 pinout](https://imgur.com/QoStCvD.jpg)
+
+## Challenges
+
+I'm very happy with the result, but at some point Proton C was driving me nuts.
+
+I did a lot of trial and error during assembly & programming.
+There were a lot of *yet* undocumented caveats,
+so I'll outline them here so that you guys can avoid the same issues I had.
+
+## Matrix & encoders
+
+Although this is a 48-key board with a 12-col & 4-row matrix, I've decided to add an extra row above the first one
+to make my matrix 12x5 and wire encoders' push buttons as 2 extra keys, thus making it a total of 50 (12x4 + 2 encoders).
+I used 2 columns (9 & 12) for those buttons.
+
+So, a first row actually has 2 buttons on columns 9 & 12 (because encoders are located near those columns).
+Encoders' push buttons are also configured via QMK's keymap.
+
+Check out the `d48.h` & `config.h` for pins used & keymap macro definition.
+
+## I<sup>2</sup>C/OLED
+
+Most of the stuff worked out of the box, except me choosing the right pins for my OLED.
+
+On the Proton C pinout, there are 3 labels for I<sup>2</sup>C and for some reason
+there are 2 pairs of SDA/SCL for I<sup>2</sup>C<sup>1</sup> channel: `B8`/`B9` (rear left side) and `B6`/`B7` (rear right side).
+I'm not sure if this is a mistake or if I was doing something wrong. So initially I picked `B8`/`B9`
+which were not working. When I switched to B6/B7, things worked like a charm.
+Later I used B9 for matrix row. No issues so far.
+
+Oh, and by the way, while using `B8`/`B9`, keyboard was sometimes *swallowing* quick keypresses.
+I believe this was due to I(2)C timeouts (because incorrect pins were used for OLED).
+
+## Buzzer
+
+It turns out once you switch on `AUDIO_ENABLE`, you cannot use A4 & A5 because they interfere with the buzzer.
+My guess is that buzzer uses DAC channels (not sure why both).
+
+I couldn't find this in documentation. Honestly, Proton C has almost zero documentation and this was
+the biggest challenge. Anyway, apart from almost going crazy from those challenges, I really liked it!
+
+## RGB
+
+I used pin `A15` for my WS28128 RGB strip.
+
+## D1307 real-time clock
+
+Connecting DS1307 RTC was a piece of cake: same I<sup>2</sup> pins as OLED (SDA/SCL), GND to GND and power to Proton C VUSB pin (5v).
+
+## Other issues
+
+- `B5` could not be used for matrix.
+- `TAP_CODE_DELAY` had to be increased to 10 to fix `tap_code(KC_VOLU/KC_VOLD)` calls being swallowed in encoder callback.
+- Be extremely attentive about the pinout: keep in mind that **the official Proton C pinout displays the rear of the board, not the front.** Being used to front pinouts, I ended up soldering entire matrix to the wrong side, so I had to desolder every wire and connect it to the opposite side.
+
+## Conclusion
+
+I had a lot of fun. The layout was inspired by the Planck THK. Feel free to ask any questions!

keyboards/handwired/d48/config.h

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+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6060
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Andrew Dunai
+#define PRODUCT         D48
+
+/* Key matrix size */
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 12
+
+/* Key matrix pins */
+#define MATRIX_ROW_PINS { B8, B9, B1, B2, B4 }
+
+#define MATRIX_COL_PINS { A2, B0, A7, A8, A13, A14, B12, B11, B10, B15, B14, B13 }
+#define UNUSED_PINS
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Set 0 if debouncing isn't needed */
+// #define DEBOUNCE 5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+// #define LOCKING_SUPPORT_ENABLE
+
+/* Locking resynchronize hack */
+// #define LOCKING_RESYNC_ENABLE
+
+/* prevent stuck modifiers */
+// #define PREVENT_STUCK_MODIFIERS
+
+/* RGB Underglow */
+#ifdef RGBLIGHT_ENABLE
+#define RGB_DI_PIN A15
+#define RGBLED_NUM 14
+#define RGBLIGHT_HUE_STEP 8
+#define RGBLIGHT_SAT_STEP 8
+#define RGBLIGHT_VAL_STEP 8
+#define RGBLIGHT_ANIMATIONS
+#endif
+
+/* Audio */
+#ifdef AUDIO_ENABLE
+#define STARTUP_SONG_DOOM SONG(E1M1_DOOM)
+#define STARTUP_SONG SONG( \
+    Q__NOTE(_E6), \
+    Q__NOTE(_A6), \
+    H__NOTE(_E7), \
+    Q__NOTE(_E6), \
+    Q__NOTE(_E7) \
+)
+#endif
+
+/* Encoders */
+#define ENCODERS_PAD_A { B3, A0 }
+#define ENCODERS_PAD_B { A6, A1 }
+/* #define ENCODER_RESOLUTION 4 */
+
+/* OLED */
+#define OLED_FONT_H "glcdfont_d48.c"
+#define OLED_TIMEOUT 0
+// #define OLED_SCROLL_TIMEOUT 1000
+
+/* Taps (encoder tap_code) */
+#define TAP_CODE_DELAY 10
+
+/* I2C */
+//#define I2C1_DUTY_CYCLE FAST_DUTY_CYCLE_2
+//#define PAL_MODE_STM32_ALTERNATE_OPENDRAIN (PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN)
+
+/* DS1307 */
+#define DS1307_ADDR (0x68 << 1)

keyboards/handwired/d48/d48.c

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+#include "d48.h"

keyboards/handwired/d48/d48.h

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+#pragma once
+
+#include "quantum.h"
+
+#define ___ KC_NO
+
+#define LAYOUT( \
+                                            K08,           K0B, \
+    K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B, \
+    K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B, \
+    K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B, \
+    K40, K41, K42, K43, K44, K45, K46, K47, K48, K49, K4A, K4B \
+) { \
+    { ___, ___, ___, ___, ___, ___, ___, ___, K08, ___, ___, K0B }, \
+    { K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B }, \
+    { K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B }, \
+    { K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B }, \
+    { K40, K41, K42, K43, K44, K45, K46, K47, K48, K49, K4A, K4B } \
+}

keyboards/handwired/d48/ds1307.c

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+#include "ds1307.h"
+#include "i2c_master.h"
+
+void ds1307_set_time(uint8_t h, uint8_t m, uint8_t s) {
+    uint8_t data[] = {
+        ((s % 10) | ((s / 10) << 4)) & 0x7F,
+        ((m % 10) | ((m / 10) << 4)) & 0x7F,
+        ((h % 10) | ((h / 10) << 4)) & 0x3F,
+        0, 0, 0, 0, 0
+    }; // 24-hour mode
+    i2c_writeReg(DS1307_ADDR, 0, data, 8, 100);
+}
+
+void ds1307_get_time(uint8_t *h, uint8_t *m, uint8_t *s) {
+    uint8_t data[3];
+    i2c_readReg(DS1307_ADDR, 0, data, 3, 100);
+    i2c_stop();
+    *s = (data[0] & 0b1111) + ((data[0] & 0b1110000) >> 4) * 10;
+    *m = (data[1] & 0b1111) + ((data[1] & 0b1110000) >> 4) * 10;
+    *h = (data[2] & 0b1111) + ((data[2] & 0b0110000) >> 4) * 10;
+}

keyboards/handwired/d48/ds1307.h

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+#pragma once
+
+#include <stdint.h>
+
+void ds1307_set_time(uint8_t h, uint8_t m, uint8_t s);
+void ds1307_get_time(uint8_t *h, uint8_t *m, uint8_t *s);