qmk-firmware/usb_keyboard.c

#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "usb_keycodes.h"
#include "usb_keyboard.h"
#include "print.h"
#include "debug.h"


// keyboard report.
static usb_keyboard_report_t _report0 = { {0,0,0,0,0,0}, 0 };
static usb_keyboard_report_t _report1 = { {0,0,0,0,0,0}, 0 };
usb_keyboard_report_t *usb_keyboard_report = &_report0;
usb_keyboard_report_t *usb_keyboard_report_back = &_report1;

// protocol setting from the host.  We use exactly the same report
// either way, so this variable only stores the setting since we
// are required to be able to report which setting is in use.
uint8_t usb_keyboard_protocol=1;

// the idle configuration, how often we send the report to the
// host (ms * 4) even when it hasn't changed
uint8_t usb_keyboard_idle_config=125;

// count until idle timeout
uint8_t usb_keyboard_idle_count=0;

// 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
volatile uint8_t usb_keyboard_leds=0;


int8_t usb_keyboard_send(void)
{
    return usb_keyboard_send_report(usb_keyboard_report);
}


int8_t usb_keyboard_send_report(usb_keyboard_report_t *report)
{
	uint8_t i, intr_state, timeout;

	if (!usb_configured()) return -1;
	intr_state = SREG;
	cli();
	UENUM = KEYBOARD_ENDPOINT;
	timeout = UDFNUML + 50;
	while (1) {
		// are we ready to transmit?
		if (UEINTX & (1<<RWAL)) break;
		SREG = intr_state;
		// has the USB gone offline?
		if (!usb_configured()) return -1;
		// have we waited too long?
		if (UDFNUML == timeout) return -1;
		// get ready to try checking again
		intr_state = SREG;
		cli();
		UENUM = KEYBOARD_ENDPOINT;
	}
	UEDATX = report->mods;
	UEDATX = 0;
	for (i=0; i<6; i++) {
		UEDATX = report->keys[i];
	}
	UEINTX = 0x3A;
	usb_keyboard_idle_count = 0;
	SREG = intr_state;

        report->is_sent =true;

        usb_keyboard_print_report(report);
	return 0;
}

void usb_keyboard_swap_report(void) {
    usb_keyboard_report_t *tmp = usb_keyboard_report_back;
    usb_keyboard_report_back = usb_keyboard_report;
    usb_keyboard_report = tmp;
}

void usb_keyboard_clear_report(void) {
    usb_keyboard_clear_keys();
    usb_keyboard_clear_mods();
    usb_keyboard_report->is_sent = false;
}

void usb_keyboard_clear_keys(void) {
    for (int i = 0; i < 6; i++) usb_keyboard_report->keys[i] = 0;
}

void usb_keyboard_clear_mods(void)
{
    usb_keyboard_report->mods = 0;
}

void usb_keyboard_add_code(uint8_t code)
{
    if (IS_MOD(code)) {
        usb_keyboard_add_mod(code);
    } else {
        usb_keyboard_add_key(code);
    }
}

void usb_keyboard_add_key(uint8_t code)
{
    for (int i = 0; i < 6; i++) {
        if (!usb_keyboard_report->keys[i]) {
            usb_keyboard_report->keys[i] = code;
            return;
        }
    }
}

void usb_keyboard_set_keys(uint8_t keys[6])
{
    for (int i = 0; i < 6; i++)
        usb_keyboard_report->keys[i] = keys[i];
}

void usb_keyboard_set_mods(uint8_t mods)
{
    usb_keyboard_report->mods = mods;
}

void usb_keyboard_add_mod(uint8_t code)
{
    usb_keyboard_report->mods |= MOD_BIT(code);
}

void usb_keyboard_del_code(uint8_t code)
{
    if (IS_MOD(code)) {
        usb_keyboard_del_mod(code);
    } else {
        usb_keyboard_del_key(code);
    }
}

void usb_keyboard_del_key(uint8_t code)
{
    for (int i = 0; i < 6; i++) {
        if (usb_keyboard_report->keys[i] == code) {
            usb_keyboard_report->keys[i] = KB_NO;
            return;
        }
    }
}

void usb_keyboard_del_mod(uint8_t code)
{
    usb_keyboard_report->mods &= ~MOD_BIT(code);
}

bool usb_keyboard_is_sent(void)
{
    return usb_keyboard_report->is_sent;
}

bool usb_keyboard_has_key(void)
{
    uint8_t keys = 0;    
    for (int i = 0; i < 6; i++) keys |= usb_keyboard_report->keys[i];
    return keys ? true : false;
}

bool usb_keyboard_has_mod(void)
{
    return usb_keyboard_report->mods ? true : false;
}

void usb_keyboard_print_report(usb_keyboard_report_t *report)
{
    if (!debug_keyboard) return;
    print("keys: ");
    for (int i = 0; i < 6; i++) { phex(report->keys[i]); print(" "); }
    print(" mods: "); phex(report->mods); print("\n");
}