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New and improved lock LED callbacks (#7215)

* New and improved lock LED callbacks

* Include stdbool

* Update documentation

* Use full function signatures and add keyboard-level example
This commit is contained in:
fauxpark 2019-11-06 11:42:16 +11:00 committed by Joel Challis
parent ed0575fc8a
commit dfb78d2a08
9 changed files with 142 additions and 70 deletions

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@ -90,68 +90,110 @@ keyrecord_t record {
# LED Control
QMK provides methods to read the 5 LEDs defined as part of the HID spec:
QMK provides methods to read 5 of the LEDs defined in the HID spec:
* `USB_LED_NUM_LOCK`
* `USB_LED_CAPS_LOCK`
* `USB_LED_SCROLL_LOCK`
* `USB_LED_COMPOSE`
* `USB_LED_KANA`
* Num Lock
* Caps Lock
* Scroll Lock
* Compose
* Kana
These five constants correspond to the positional bits of the host LED state.
There are two ways to get the host LED state:
There are two ways to get the lock LED state:
* by implementing `led_set_user()`
* by calling `host_keyboard_leds()`
* by implementing `bool led_update_kb(led_t led_state)` or `_user(led_t led_state)`; or
* by calling `led_t host_keyboard_led_state()`
## `led_set_user()`
!> `host_keyboard_led_state()` may already reflect a new value before `led_update_user()` is called.
This function will be called when the state of one of those 5 LEDs changes. It receives the LED state as a parameter.
Use the `IS_LED_ON(usb_led, led_name)` and `IS_LED_OFF(usb_led, led_name)` macros to check the LED status.
Two more deprecated functions exist that provide the LED state as a `uint8_t`:
!> `host_keyboard_leds()` may already reflect a new value before `led_set_user()` is called.
* `uint8_t led_set_kb(uint8_t usb_led)` and `_user(uint8_t usb_led)`
* `uint8_t host_keyboard_leds()`
### Example `led_set_user()` Implementation
## `led_update_user()`
This function will be called when the state of one of those 5 LEDs changes. It receives the LED state as a struct parameter.
You must return either `true` or `false` from this function, depending on whether you want to override the keyboard-level implementation.
?> Because the `led_set_*` functions return `void` instead of `bool`, they do not allow for overriding the keyboard LED control, and thus it's recommended to use `led_update_*` instead.
### Example `led_update_kb()` Implementation
```c
void led_set_user(uint8_t usb_led) {
if (IS_LED_ON(usb_led, USB_LED_NUM_LOCK)) {
bool led_update_kb(led_t led_state) {
if(led_update_user(led_state)) {
if (led_state.num_lock) {
writePinLow(B0);
} else {
writePinHigh(B0);
}
if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK)) {
if (led_state.caps_lock) {
writePinLow(B1);
} else {
writePinHigh(B1);
}
if (IS_LED_ON(usb_led, USB_LED_SCROLL_LOCK)) {
if (led_state.scroll_lock) {
writePinLow(B2);
} else {
writePinHigh(B2);
}
if (IS_LED_ON(usb_led, USB_LED_COMPOSE)) {
if (led_state.compose) {
writePinLow(B3);
} else {
writePinHigh(B3);
}
if (IS_LED_ON(usb_led, USB_LED_KANA)) {
if (led_state.kana) {
writePinLow(B4);
} else {
writePinHigh(B4);
}
return true;
}
}
```
### `led_set_*` Function Documentation
### Example `led_update_user()` Implementation
* Keyboard/Revision: `void led_set_kb(uint8_t usb_led)`
* Keymap: `void led_set_user(uint8_t usb_led)`
```c
bool led_update_user(led_t led_state) {
if (led_state.num_lock) {
writePinLow(B0);
} else {
writePinHigh(B0);
}
if (led_state.caps_lock) {
writePinLow(B1);
} else {
writePinHigh(B1);
}
if (led_state.scroll_lock) {
writePinLow(B2);
} else {
writePinHigh(B2);
}
if (led_state.compose) {
writePinLow(B3);
} else {
writePinHigh(B3);
}
if (led_state.kana) {
writePinLow(B4);
} else {
writePinHigh(B4);
}
return true;
}
```
## `host_keyboard_leds()`
### `led_update_*` Function Documentation
Call this function to get the last received LED state. This is useful for reading the LED state outside `led_set_*`, e.g. in [`matrix_scan_user()`](#matrix-scanning-code).
For convenience, you can use the `IS_HOST_LED_ON(led_name)` and `IS_HOST_LED_OFF(led_name)` macros instead of calling and checking `host_keyboard_leds()` directly.
* Keyboard/Revision: `bool led_update_kb(led_t led_state)`
* Keymap: `bool led_update_user(led_t led_state)`
## `host_keyboard_led_state()`
Call this function to get the last received LED state as a `led_t`. This is useful for reading the LED state outside `led_update_*`, e.g. in [`matrix_scan_user()`](#matrix-scanning-code).
## Setting Physical LED State

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@ -33,26 +33,12 @@ void led_init_ports(void) {
setPinOutput(B2);
}
void led_set_kb(uint8_t usb_led) {
// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK)) {
writePinLow(B0);
} else {
writePinHigh(B0);
bool led_update_kb(led_t led_state) {
if(led_update_user(led_state)) {
writePin(B0, !led_state.caps_lock);
writePin(B1, !led_state.scroll_lock);
writePin(B2, !led_state.num_lock);
}
if (IS_LED_ON(usb_led, USB_LED_SCROLL_LOCK)) {
writePinLow(B1);
} else {
writePinHigh(B1);
}
if (IS_LED_ON(usb_led, USB_LED_NUM_LOCK)) {
writePinLow(B2);
} else {
writePinHigh(B2);
}
led_set_user(usb_led);
return true;
}

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@ -1070,10 +1070,30 @@ void api_send_unicode(uint32_t unicode) {
#endif
}
/** \brief Lock LED set callback - keymap/user level
*
* \deprecated Use led_update_user() instead.
*/
__attribute__((weak)) void led_set_user(uint8_t usb_led) {}
/** \brief Lock LED set callback - keyboard level
*
* \deprecated Use led_update_kb() instead.
*/
__attribute__((weak)) void led_set_kb(uint8_t usb_led) { led_set_user(usb_led); }
/** \brief Lock LED update callback - keymap/user level
*
* \return True if led_update_kb() should run its own code, false otherwise.
*/
__attribute__((weak)) bool led_update_user(led_t led_state) { return true; }
/** \brief Lock LED update callback - keyboard level
*
* \return Ignored for now.
*/
__attribute__((weak)) bool led_update_kb(led_t led_state) { return led_update_user(led_state); }
__attribute__((weak)) void led_init_ports(void) {}
__attribute__((weak)) void led_set(uint8_t usb_led) {
@ -1096,6 +1116,7 @@ __attribute__((weak)) void led_set(uint8_t usb_led) {
#endif
led_set_kb(usb_led);
led_update_kb((led_t) usb_led);
}
//------------------------------------------------------------------------------

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@ -289,5 +289,7 @@ uint16_t hex_to_keycode(uint8_t hex);
void led_set_user(uint8_t usb_led);
void led_set_kb(uint8_t usb_led);
bool led_update_user(led_t led_state);
bool led_update_kb(led_t led_state);
void api_send_unicode(uint32_t unicode);

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@ -42,9 +42,9 @@ bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
return process_record_user(keycode, record);
}
void led_set_kb(uint8_t usb_led) {
bool led_update_kb(led_t led_state) {
// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
led_set_user(usb_led);
return led_update_user(led_state);
}
*/

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@ -70,7 +70,7 @@ void matrix_scan_user(void) {
}
void led_set_user(uint8_t usb_led) {
bool led_update_user(led_t led_state) {
return true;
}
*/

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@ -39,6 +39,12 @@ uint8_t host_keyboard_leds(void) {
if (!driver) return 0;
return (*driver->keyboard_leds)();
}
led_t host_keyboard_led_state(void) {
if (!driver) return (led_t) {0};
return (led_t)((*driver->keyboard_leds)());
}
/* send report */
void host_keyboard_send(report_keyboard_t *report) {
if (!driver) return;

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@ -21,6 +21,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <stdbool.h>
#include "report.h"
#include "host_driver.h"
#include "led.h"
#define IS_LED_ON(leds, led_name) ((leds) & (1 << (led_name)))
#define IS_LED_OFF(leds, led_name) (~(leds) & (1 << (led_name)))
@ -41,6 +42,7 @@ host_driver_t *host_get_driver(void);
/* host driver interface */
uint8_t host_keyboard_leds(void);
led_t host_keyboard_led_state(void);
void host_keyboard_send(report_keyboard_t *report);
void host_mouse_send(report_mouse_t *report);
void host_system_send(uint16_t data);

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@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifndef LED_H
#define LED_H
#include "stdint.h"
#include "stdbool.h"
/* FIXME: Add doxygen comments here. */
@ -32,6 +33,18 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
extern "C" {
#endif
typedef union {
uint8_t raw;
struct {
bool num_lock : 1;
bool caps_lock : 1;
bool scroll_lock : 1;
bool compose : 1;
bool kana : 1;
uint8_t reserved : 3;
};
} led_t;
void led_set(uint8_t usb_led);
void led_init_ports(void);