Fix jj40 capslock and minor keymap updates (#3168)

* Adjust TAPPING_TERM to make accessing the nav layer easier

* JJ40: Add RESET key to lower layer.

* Disable all lock LEDs on "oscillope" keymap.

I'm not 100% sure why yet, but attempting to turn on a lock LED on my v1
JJ40 PCB causes the PCB to become unresponsive. The easy fix is to just
disable all of the lock LEDs, since I don't have any LEDs on my keyboard
anyway.
Many thanks to u/wanleg on Reddit for suggesting this fix: https://www.reddit.com/r/olkb/comments/8en8f1/strange_caps_lock_behavior/e06kcaf/

keyboards/jj40/keymaps/oscillope/backlight.c

@@ -0,0 +1,59 @@
+/**
+ * Backlighting code for PS2AVRGB boards (ATMEGA32A)
+ * Kenneth A. (github.com/krusli | krusli.me)
+ */
+
+#include "quantum.h"
+
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+// Port D: digital pins of the AVR chipset
+#define NUMLOCK_PORT    (1 << 1)  // 1st pin of Port D (digital)
+#define CAPSLOCK_PORT   (1 << 2)  // 2nd pin
+#define BACKLIGHT_PORT  (1 << 4)  // 4th pin
+#define SCROLLLOCK_PORT (1 << 6)  // 6th pin
+
+/**
+ * References
+ * Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
+ * TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
+ * Timers: http://www.avrbeginners.net/architecture/timers/timers.html
+ * 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
+ * PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
+ */
+
+// @Override
+// turn LEDs on and off depending on USB caps/num/scroll lock states.
+void led_set_user(uint8_t usb_led) {
+/* It appears that these cause the v1 JJ40 PCB to hang.
+ * I haven't looked into why, but I don't have any LEDs on my board anyway. */
+#if 0
+    if (usb_led & (1 << USB_LED_NUM_LOCK)) {
+      // turn on
+      DDRD  |= NUMLOCK_PORT;
+      PORTD |= NUMLOCK_PORT;
+    } else {
+      // turn off
+      DDRD  &= ~NUMLOCK_PORT;
+      PORTD &= ~NUMLOCK_PORT;
+    }
+
+    if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
+      DDRD  |= CAPSLOCK_PORT;
+      PORTD |= CAPSLOCK_PORT;
+    } else {
+      DDRD  &= ~CAPSLOCK_PORT;
+      PORTD &= ~CAPSLOCK_PORT;
+    }
+
+    if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
+      DDRD  |= SCROLLLOCK_PORT;
+      PORTD |= SCROLLLOCK_PORT;
+    } else {
+      DDRD  &= ~SCROLLLOCK_PORT;
+      PORTD &= ~SCROLLLOCK_PORT;
+    }
+#endif
+}
+

keyboards/jj40/keymaps/oscillope/config.h

@@ -4,6 +4,6 @@
 #include "../../config.h"
 
 #define PREVENT_STUCK_MODIFIERS
-#define TAPPING_TERM 300
+#define TAPPING_TERM 200
 
 #endif

keyboards/jj40/keymaps/oscillope/keymap.c

@@ -64,7 +64,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  * |------+------+------+------+------+-------------+------+------+------+------+------|
  * | Ins  |      |      |  ()  |  []  |  {}  | Left | Down |  Up  |Right |      |      |
  * |------+------+------+------+------+------|------+------+------+------+------+------|
- * |PrScr | Back | Fwd  |      |      |      |      |      | Mute | Vol- | Vol+ |      |
+ * |RESET | Back | Fwd  |      |      |      |      |      | Mute | Vol- | Vol+ |      |
  * |------+------+------+------+------+------+------+------+------+------+------+------|
  * |      |      |      |      | Lock |      |             | Prev | Stop | Play | Next |
  * `-----------------------------------------------------------------------------------'
@@ -72,7 +72,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 [_LOWER] = KEYMAP( \
   KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12, \
   KC_INS,  _______, _______, CC_PRN,  CC_BRC,  CC_CBR,  KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, _______, _______, \
-  KC_PSCR, KC_WBAK, KC_WFWD, _______, _______, _______, _______, _______, KC_MUTE, KC_VOLD, KC_VOLU, _______, \
+  RESET,   KC_WBAK, KC_WFWD, _______, _______, _______, _______, _______, KC_MUTE, KC_VOLD, KC_VOLU, _______, \
   _______, _______, _______, _______, KC_LOCK, _______, _______,          KC_MPRV, KC_MSTP, KC_MPLY, KC_MNXT \
 ),