keychron_qmk_firmware/protocol/usb_hid/leonardo_led.h

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#ifndef LEONARDO_LED_H
#define LEONARDO_LED_H
// Leonardo "TX" LED for debug
#define LED_TX_INIT (DDRD |= (1<<5))
#define LED_TX_ON (PORTD &= ~(1<<5))
#define LED_TX_OFF (PORTD |= (1<<5))
#define LED_TX_TOGGLE (PORTD ^= (1<<5))
#endif