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-rw-r--r--docs/config_options.md2
-rw-r--r--docs/feature_backlight.md10
-rw-r--r--quantum/quantum.c17
3 files changed, 19 insertions, 10 deletions
diff --git a/docs/config_options.md b/docs/config_options.md
index 7418e8dbf9..eb0a441ccc 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -80,7 +80,7 @@ This is a C header file that is one of the first things included, and will persi
* `#define BACKLIGHT_LEVELS 3`
* number of levels your backlight will have (maximum 15 excluding off)
* `#define BACKLIGHT_BREATHING`
- * enables backlight breathing (only works with backlight pins B5, B6 and B7)
+ * enables backlight breathing
* `#define BREATHING_PERIOD 6`
* the length of one backlight "breath" in seconds
* `#define DEBOUNCE 5`
diff --git a/docs/feature_backlight.md b/docs/feature_backlight.md
index 5a21a67901..b06db89e4d 100644
--- a/docs/feature_backlight.md
+++ b/docs/feature_backlight.md
@@ -64,11 +64,17 @@ To change the behaviour of the backlighting, `#define` these in your `config.h`:
|Define |Default |Description |
|---------------------|-------------|-------------------------------------------------------------------------------------------------------------|
|`BACKLIGHT_PIN` |`B7` |The pin that controls the LEDs. Unless you are designing your own keyboard, you shouldn't need to change this|
-|`BACKLIGHT_PINS` |*Not defined*|experimental: see below for more information|
+|`BACKLIGHT_PINS` |*Not defined*|experimental: see below for more information |
|`BACKLIGHT_LEVELS` |`3` |The number of brightness levels (maximum 15 excluding off) |
|`BACKLIGHT_CAPS_LOCK`|*Not defined*|Enable Caps Lock indicator using backlight (for keyboards without dedicated LED) |
-|`BACKLIGHT_BREATHING`|*Not defined*|Enable backlight breathing, if supported |
+|`BACKLIGHT_BREATHING`|*Not defined*|Enable backlight breathing, if supported |
|`BREATHING_PERIOD` |`6` |The length of one backlight "breath" in seconds |
+|`BACKLIGHT_ON_STATE` |`0` |The state of the backlight pin when the backlight is "on" - `1` for high, `0` for low |
+
+## Backlight On State
+
+Most backlight circuits are driven by an N-channel MOSFET or NPN transistor. This means that to turn the transistor *on* and light the LEDs, you must drive the backlight pin, connected to the gate or base, *low*.
+Sometimes, however, a P-channel MOSFET, or a PNP transistor is used. In this case you must `#define BACKLIGHT_ON_STATE 1`, so that when the transistor is on, the pin is driven *high* instead.
## Multiple backlight pins
diff --git a/quantum/quantum.c b/quantum/quantum.c
index 36b7942d5d..6530738b71 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -707,8 +707,9 @@ bool process_record_quantum(keyrecord_t *record) {
#if defined(BACKLIGHT_ENABLE) && defined(BACKLIGHT_BREATHING)
case BL_BRTG: {
- if (record->event.pressed)
+ if (record->event.pressed) {
breathing_toggle();
+ }
return false;
}
#endif
@@ -1148,13 +1149,13 @@ void backlight_off(uint8_t backlight_pin) {
#define BACKLIGHT_PIN_INIT BACKLIGHT_PINS
#endif
-#define FOR_EACH_LED(x) \
+#define FOR_EACH_LED(x) \
for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) \
- { \
- uint8_t backlight_pin = backlight_pins[i]; \
+ { \
+ uint8_t backlight_pin = backlight_pins[i]; \
{ \
- x \
- } \
+ x \
+ } \
}
static const uint8_t backlight_pins[BACKLIGHT_LED_COUNT] = BACKLIGHT_PIN_INIT;
@@ -1233,7 +1234,9 @@ ISR(TIMERx_COMPA_vect) {
// this one triggers at F_CPU/65536 =~ 244 Hz
ISR(TIMERx_OVF_vect) {
#ifdef BACKLIGHT_BREATHING
- breathing_task();
+ if(is_breathing()) {
+ breathing_task();
+ }
#endif
// for very small values of OCRxx (or backlight level)
// we can't guarantee this whole code won't execute