77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "usb_keyboard.h"
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// which modifier keys are currently pressed
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// 1=left ctrl, 2=left shift, 4=left alt, 8=left gui
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// 16=right ctrl, 32=right shift, 64=right alt, 128=right gui
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uint8_t keyboard_modifier_keys=0;
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// which keys are currently pressed, up to 6 keys may be down at once
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uint8_t keyboard_keys[6]={0,0,0,0,0,0};
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// protocol setting from the host. We use exactly the same report
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// either way, so this variable only stores the setting since we
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// are required to be able to report which setting is in use.
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uint8_t keyboard_protocol=1;
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// the idle configuration, how often we send the report to the
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// host (ms * 4) even when it hasn't changed
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uint8_t keyboard_idle_config=125;
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// count until idle timeout
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uint8_t keyboard_idle_count=0;
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// 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
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volatile uint8_t keyboard_leds=0;
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// perform a single keystroke
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int8_t usb_keyboard_press(uint8_t key, uint8_t modifier)
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{
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int8_t r;
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keyboard_modifier_keys = modifier;
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keyboard_keys[0] = key;
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r = usb_keyboard_send();
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if (r) return r;
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keyboard_modifier_keys = 0;
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keyboard_keys[0] = 0;
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return usb_keyboard_send();
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}
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// send the contents of keyboard_keys and keyboard_modifier_keys
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int8_t usb_keyboard_send(void)
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{
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uint8_t i, intr_state, timeout;
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if (!usb_configured()) return -1;
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intr_state = SREG;
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cli();
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UENUM = KEYBOARD_ENDPOINT;
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timeout = UDFNUML + 50;
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while (1) {
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// are we ready to transmit?
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if (UEINTX & (1<<RWAL)) break;
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SREG = intr_state;
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// has the USB gone offline?
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if (!usb_configured()) return -1;
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// have we waited too long?
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if (UDFNUML == timeout) return -1;
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// get ready to try checking again
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intr_state = SREG;
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cli();
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UENUM = KEYBOARD_ENDPOINT;
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}
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UEDATX = keyboard_modifier_keys;
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UEDATX = 0;
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for (i=0; i<6; i++) {
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UEDATX = keyboard_keys[i];
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}
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UEINTX = 0x3A;
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keyboard_idle_count = 0;
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SREG = intr_state;
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return 0;
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}
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