diff options
| -rw-r--r-- | keyboard/atomic/Makefile | 4 | ||||
| -rw-r--r-- | keyboard/atomic/atomic.c | 61 | ||||
| -rw-r--r-- | keyboard/atomic/atomic.h | 5 | ||||
| -rw-r--r-- | keyboard/atomic/backlight.c | 63 | ||||
| -rw-r--r-- | keyboard/planck/Makefile | 4 | ||||
| -rw-r--r-- | keyboard/planck/backlight.c | 61 | ||||
| -rw-r--r-- | keyboard/planck/planck.c | 61 | ||||
| -rw-r--r-- | keyboard/planck/planck.h | 1 | ||||
| -rw-r--r-- | keyboard/preonic/Makefile | 5 | ||||
| -rw-r--r-- | keyboard/preonic/backlight.c | 61 | ||||
| -rw-r--r-- | keyboard/preonic/preonic.c | 63 | ||||
| -rw-r--r-- | keyboard/preonic/preonic.h | 1 | ||||
| -rw-r--r-- | quantum/template/Makefile | 46 | ||||
| -rw-r--r-- | quantum/template/template.c | 61 | ||||
| -rw-r--r-- | quantum/template/template.h | 5 |
15 files changed, 287 insertions, 215 deletions
diff --git a/keyboard/atomic/Makefile b/keyboard/atomic/Makefile index 1d91c34b7f..c1a0a6db42 100644 --- a/keyboard/atomic/Makefile +++ b/keyboard/atomic/Makefile @@ -171,10 +171,6 @@ endif endif -ifeq ($(strip $(BACKLIGHT_ENABLE)), yes) - SRC := backlight.c $(SRC) -endif - # Optimize size but this may cause error "relocation truncated to fit" #EXTRALDFLAGS = -Wl,--relax diff --git a/keyboard/atomic/atomic.c b/keyboard/atomic/atomic.c index 5e31264e68..3996497161 100644 --- a/keyboard/atomic/atomic.c +++ b/keyboard/atomic/atomic.c @@ -57,3 +57,64 @@ void led_set_kb(uint8_t usb_led) { led_set_user(usb_led); } + +#ifdef BACKLIGHT_ENABLE +#define CHANNEL OCR1C + +void backlight_init_ports() +{ + + // Setup PB7 as output and output low. + DDRB |= (1<<7); + PORTB &= ~(1<<7); + + // Use full 16-bit resolution. + ICR1 = 0xFFFF; + + // I could write a wall of text here to explain... but TL;DW + // Go read the ATmega32u4 datasheet. + // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on + + // Pin PB7 = OCR1C (Timer 1, Channel C) + // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 + // (i.e. start high, go low when counter matches.) + // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 + // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 + + TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + if ( level == 0 ) + { + // Turn off PWM control on PB7, revert to output low. + TCCR1A &= ~(_BV(COM1C1)); + CHANNEL = 0x0; + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + } + else if ( level == BACKLIGHT_LEVELS ) + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF; + } + else + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); + } +} + +#endif
\ No newline at end of file diff --git a/keyboard/atomic/atomic.h b/keyboard/atomic/atomic.h index d5461e424d..0c7aeb1cc8 100644 --- a/keyboard/atomic/atomic.h +++ b/keyboard/atomic/atomic.h @@ -3,8 +3,11 @@ #include "matrix.h" #include "keymap_common.h" -#include "backlight.h" +#ifdef BACKLIGHT_ENABLE + #include "backlight.h" +#endif #include <stddef.h> +#include <avr/io.h> // This a shortcut to help you visually see your layout. // The following is an example using the Planck MIT layout diff --git a/keyboard/atomic/backlight.c b/keyboard/atomic/backlight.c deleted file mode 100644 index 647b57e718..0000000000 --- a/keyboard/atomic/backlight.c +++ /dev/null @@ -1,63 +0,0 @@ - -#include <avr/io.h> -#include "backlight.h" -#include "atomic.h" - - -#define CHANNEL OCR1C - -void backlight_init_ports() -{ - - // Setup PB7 as output and output low. - DDRB |= (1<<7); - PORTB &= ~(1<<7); - - // Use full 16-bit resolution. - ICR1 = 0xFFFF; - - // I could write a wall of text here to explain... but TL;DW - // Go read the ATmega32u4 datasheet. - // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on - - // Pin PB7 = OCR1C (Timer 1, Channel C) - // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 - // (i.e. start high, go low when counter matches.) - // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 - // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 - - TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; - TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; - - backlight_init(); -} - -void backlight_set(uint8_t level) -{ - if ( level == 0 ) - { - // Turn off PWM control on PB7, revert to output low. - TCCR1A &= ~(_BV(COM1C1)); - CHANNEL = 0x0; - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - } - else if ( level == BACKLIGHT_LEVELS ) - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF; - } - else - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); - } -}
\ No newline at end of file diff --git a/keyboard/planck/Makefile b/keyboard/planck/Makefile index 01d9e3ce9a..c0c6201cba 100644 --- a/keyboard/planck/Makefile +++ b/keyboard/planck/Makefile @@ -171,10 +171,6 @@ endif endif -ifeq ($(strip $(BACKLIGHT_ENABLE)), yes) - SRC := backlight.c $(SRC) -endif - # Optimize size but this may cause error "relocation truncated to fit" #EXTRALDFLAGS = -Wl,--relax diff --git a/keyboard/planck/backlight.c b/keyboard/planck/backlight.c deleted file mode 100644 index f69364b2af..0000000000 --- a/keyboard/planck/backlight.c +++ /dev/null @@ -1,61 +0,0 @@ - -#include <avr/io.h> -#include "backlight.h" - -#define CHANNEL OCR1C - -void backlight_init_ports() -{ - - // Setup PB7 as output and output low. - DDRB |= (1<<7); - PORTB &= ~(1<<7); - - // Use full 16-bit resolution. - ICR1 = 0xFFFF; - - // I could write a wall of text here to explain... but TL;DW - // Go read the ATmega32u4 datasheet. - // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on - - // Pin PB7 = OCR1C (Timer 1, Channel C) - // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 - // (i.e. start high, go low when counter matches.) - // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 - // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 - - TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; - TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; - - backlight_init(); -} - -void backlight_set(uint8_t level) -{ - if ( level == 0 ) - { - // Turn off PWM control on PB7, revert to output low. - TCCR1A &= ~(_BV(COM1C1)); - CHANNEL = 0x0; - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - } - else if ( level == BACKLIGHT_LEVELS ) - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF; - } - else - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); - } -}
\ No newline at end of file diff --git a/keyboard/planck/planck.c b/keyboard/planck/planck.c index 4b39cf1e8b..6558501504 100644 --- a/keyboard/planck/planck.c +++ b/keyboard/planck/planck.c @@ -32,3 +32,64 @@ void matrix_scan_kb(void) { void process_action_kb(keyrecord_t *record) { process_action_user(record); } + +#ifdef BACKLIGHT_ENABLE +#define CHANNEL OCR1C + +void backlight_init_ports() +{ + + // Setup PB7 as output and output low. + DDRB |= (1<<7); + PORTB &= ~(1<<7); + + // Use full 16-bit resolution. + ICR1 = 0xFFFF; + + // I could write a wall of text here to explain... but TL;DW + // Go read the ATmega32u4 datasheet. + // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on + + // Pin PB7 = OCR1C (Timer 1, Channel C) + // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 + // (i.e. start high, go low when counter matches.) + // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 + // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 + + TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + if ( level == 0 ) + { + // Turn off PWM control on PB7, revert to output low. + TCCR1A &= ~(_BV(COM1C1)); + CHANNEL = 0x0; + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + } + else if ( level == BACKLIGHT_LEVELS ) + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF; + } + else + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); + } +} + +#endif
\ No newline at end of file diff --git a/keyboard/planck/planck.h b/keyboard/planck/planck.h index edcb5fbff6..c5b59d9998 100644 --- a/keyboard/planck/planck.h +++ b/keyboard/planck/planck.h @@ -10,6 +10,7 @@ #include "rgblight.h" #endif #include <stddef.h> +#include <avr/io.h> #ifdef MIDI_ENABLE #include <keymap_midi.h> #endif diff --git a/keyboard/preonic/Makefile b/keyboard/preonic/Makefile index 3504e27201..259dd6686b 100644 --- a/keyboard/preonic/Makefile +++ b/keyboard/preonic/Makefile @@ -162,11 +162,6 @@ endif endif -ifeq ($(strip $(BACKLIGHT_ENABLE)), yes) - SRC := backlight.c $(SRC) -endif - - # Optimize size but this may cause error "relocation truncated to fit" #EXTRALDFLAGS = -Wl,--relax diff --git a/keyboard/preonic/backlight.c b/keyboard/preonic/backlight.c deleted file mode 100644 index f69364b2af..0000000000 --- a/keyboard/preonic/backlight.c +++ /dev/null @@ -1,61 +0,0 @@ - -#include <avr/io.h> -#include "backlight.h" - -#define CHANNEL OCR1C - -void backlight_init_ports() -{ - - // Setup PB7 as output and output low. - DDRB |= (1<<7); - PORTB &= ~(1<<7); - - // Use full 16-bit resolution. - ICR1 = 0xFFFF; - - // I could write a wall of text here to explain... but TL;DW - // Go read the ATmega32u4 datasheet. - // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on - - // Pin PB7 = OCR1C (Timer 1, Channel C) - // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 - // (i.e. start high, go low when counter matches.) - // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 - // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 - - TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; - TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; - - backlight_init(); -} - -void backlight_set(uint8_t level) -{ - if ( level == 0 ) - { - // Turn off PWM control on PB7, revert to output low. - TCCR1A &= ~(_BV(COM1C1)); - CHANNEL = 0x0; - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - } - else if ( level == BACKLIGHT_LEVELS ) - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF; - } - else - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); - } -}
\ No newline at end of file diff --git a/keyboard/preonic/preonic.c b/keyboard/preonic/preonic.c index f639f247a5..211f8d0296 100644 --- a/keyboard/preonic/preonic.c +++ b/keyboard/preonic/preonic.c @@ -38,4 +38,65 @@ void matrix_scan_kb(void) { void process_action_kb(keyrecord_t *record) { process_action_user(record); -}
\ No newline at end of file +} + +#ifdef BACKLIGHT_ENABLE +#define CHANNEL OCR1C + +void backlight_init_ports() +{ + + // Setup PB7 as output and output low. + DDRB |= (1<<7); + PORTB &= ~(1<<7); + + // Use full 16-bit resolution. + ICR1 = 0xFFFF; + + // I could write a wall of text here to explain... but TL;DW + // Go read the ATmega32u4 datasheet. + // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on + + // Pin PB7 = OCR1C (Timer 1, Channel C) + // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 + // (i.e. start high, go low when counter matches.) + // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 + // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 + + TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + if ( level == 0 ) + { + // Turn off PWM control on PB7, revert to output low. + TCCR1A &= ~(_BV(COM1C1)); + CHANNEL = 0x0; + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + } + else if ( level == BACKLIGHT_LEVELS ) + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF; + } + else + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); + } +} + +#endif
\ No newline at end of file diff --git a/keyboard/preonic/preonic.h b/keyboard/preonic/preonic.h index 51ed9ba393..030acdadb4 100644 --- a/keyboard/preonic/preonic.h +++ b/keyboard/preonic/preonic.h @@ -10,6 +10,7 @@ #include "rgblight.h" #endif #include <stddef.h> +#include <avr/io.h> #ifdef MIDI_ENABLE #include <keymap_midi.h> #endif diff --git a/quantum/template/Makefile b/quantum/template/Makefile index 4fa195468d..1a535ef2cb 100644 --- a/quantum/template/Makefile +++ b/quantum/template/Makefile @@ -111,23 +111,41 @@ OPT_DEFS += -DBOOTLOADER_SIZE=512 # Build Options -# comment out to disable the options. -# -BOOTMAGIC_ENABLE = yes # Virtual DIP switch configuration(+1000) -MOUSEKEY_ENABLE = yes # Mouse keys(+4700) -EXTRAKEY_ENABLE = yes # Audio control and System control(+450) -CONSOLE_ENABLE = yes # Console for debug(+400) -COMMAND_ENABLE = yes # Commands for debug and configuration -KEYBOARD_LOCK_ENABLE = yes # Allow locking of keyboard via magic key +# change yes to no to disable +# +BOOTMAGIC_ENABLE = yes # Virtual DIP switch configuration(+1000) +MOUSEKEY_ENABLE = yes # Mouse keys(+4700) +EXTRAKEY_ENABLE = yes # Audio control and System control(+450) +CONSOLE_ENABLE = yes # Console for debug(+400) +COMMAND_ENABLE = yes # Commands for debug and configuration +KEYBOARD_LOCK_ENABLE = yes # Allow locking of keyboard via magic key # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE -# SLEEP_LED_ENABLE = yes # Breathing sleep LED during USB suspend -#NKRO_ENABLE = yes # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work -# BACKLIGHT_ENABLE = yes # Enable keyboard backlight functionality -# MIDI_ENABLE = YES # MIDI controls -# UNICODE_ENABLE = YES # Unicode -# BLUETOOTH_ENABLE = yes # Enable Bluetooth with the Adafruit EZ-Key HID +SLEEP_LED_ENABLE = no # Breathing sleep LED during USB suspend +# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work +NKRO_ENABLE = no # USB Nkey Rollover +BACKLIGHT_ENABLE = yes # Enable keyboard backlight functionality +MIDI_ENABLE = no # MIDI controls +UNICODE_ENABLE = no # Unicode +BLUETOOTH_ENABLE = no # Enable Bluetooth with the Adafruit EZ-Key HID +AUDIO_ENABLE = no # Audio output on port C6 +ifdef KEYMAP + +ifeq ("$(wildcard keymaps/$(KEYMAP).c)","") +ifneq ("$(wildcard keymaps/$(KEYMAP)/makefile.mk)","") + include keymaps/$(KEYMAP)/makefile.mk +endif +endif + +else + +ifneq ("$(wildcard keymaps/default/makefile.mk)","") + include keymaps/default/makefile.mk +endif + +endif + # Optimize size but this may cause error "relocation truncated to fit" #EXTRALDFLAGS = -Wl,--relax diff --git a/quantum/template/template.c b/quantum/template/template.c index cc52e496ff..6050a2d20c 100644 --- a/quantum/template/template.c +++ b/quantum/template/template.c @@ -46,3 +46,64 @@ void led_set_kb(uint8_t usb_led) { led_set_user(usb_led); } + +#ifdef BACKLIGHT_ENABLE +#define CHANNEL OCR1C + +void backlight_init_ports() +{ + + // Setup PB7 as output and output low. + DDRB |= (1<<7); + PORTB &= ~(1<<7); + + // Use full 16-bit resolution. + ICR1 = 0xFFFF; + + // I could write a wall of text here to explain... but TL;DW + // Go read the ATmega32u4 datasheet. + // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on + + // Pin PB7 = OCR1C (Timer 1, Channel C) + // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 + // (i.e. start high, go low when counter matches.) + // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 + // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 + + TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + if ( level == 0 ) + { + // Turn off PWM control on PB7, revert to output low. + TCCR1A &= ~(_BV(COM1C1)); + CHANNEL = 0x0; + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + } + else if ( level == BACKLIGHT_LEVELS ) + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF; + } + else + { + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB7)); + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + // Set the brightness + CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); + } +} + +#endif
\ No newline at end of file diff --git a/quantum/template/template.h b/quantum/template/template.h index b1c34d3cbe..22742105a3 100644 --- a/quantum/template/template.h +++ b/quantum/template/template.h @@ -3,7 +3,10 @@ #include "matrix.h" #include "keymap_common.h" -#include "backlight.h" +#ifdef BACKLIGHT_ENABLE + #include "backlight.h" +#endif +#include <avr/io.h> #include <stddef.h> // This a shortcut to help you visually see your layout. |