pjrc/usb_keyboard.c

   1 #include <avr/interrupt.h>
   2 #include <avr/pgmspace.h>
   3 #include "usb_keycodes.h"
   4 #include "usb_keyboard.h"
   5 #include "print.h"
   6 #include "debug.h"
   7 #include "util.h"
   8 #include "host.h"
   9
  10
  11 // protocol setting from the host.  We use exactly the same report
  12 // either way, so this variable only stores the setting since we
  13 // are required to be able to report which setting is in use.
  14 uint8_t usb_keyboard_protocol=1;
  15
  16 // the idle configuration, how often we send the report to the
  17 // host (ms * 4) even when it hasn't changed
  18 uint8_t usb_keyboard_idle_config=125;
  19
  20 // count until idle timeout
  21 uint8_t usb_keyboard_idle_count=0;
  22
  23 // 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
  24 volatile uint8_t usb_keyboard_leds=0;
  25
  26
  27 static inline int8_t send_report(report_keyboard_t *report, uint8_t endpoint, uint8_t keys_start, uint8_t keys_end);
  28
  29
  30 int8_t usb_keyboard_send_report(report_keyboard_t *report)
  31 {
  32     int8_t result = 0;
  33
  34 #ifdef USB_NKRO_ENABLE
  35     if (keyboard_nkro)
  36         result = send_report(report, KBD2_ENDPOINT, 0, KBD2_REPORT_KEYS);
  37     else
  38 #endif
  39     {
  40         if (usb_keyboard_protocol)
  41             result = send_report(report, KBD_ENDPOINT, 0, KBD_REPORT_KEYS);
  42         else
  43             result = send_report(report, KBD_ENDPOINT, 0, 6);
  44     }
  45
  46     if (result) return result;
  47     usb_keyboard_idle_count = 0;
  48     usb_keyboard_print_report(report);
  49     return 0;
  50 }
  51
  52 void usb_keyboard_print_report(report_keyboard_t *report)
  53 {
  54     if (!debug_keyboard) return;
  55     print("keys: ");
  56     for (int i = 0; i < REPORT_KEYS; i++) { phex(report->keys[i]); print(" "); }
  57     print(" mods: "); phex(report->mods); print("\n");
  58 }
  59
  60
  61 static inline int8_t send_report(report_keyboard_t *report, uint8_t endpoint, uint8_t keys_start, uint8_t keys_end)
  62 {
  63     uint8_t intr_state, timeout;
  64
  65     if (!usb_configured()) return -1;
  66     intr_state = SREG;
  67     cli();
  68     UENUM = endpoint;
  69     timeout = UDFNUML + 50;
  70     while (1) {
  71             // are we ready to transmit?
  72             if (UEINTX & (1<<RWAL)) break;
  73             SREG = intr_state;
  74             // has the USB gone offline?
  75             if (!usb_configured()) return -1;
  76             // have we waited too long?
  77             if (UDFNUML == timeout) return -1;
  78             // get ready to try checking again
  79             intr_state = SREG;
  80             cli();
  81             UENUM = endpoint;
  82     }
  83     UEDATX = report->mods;
  84     if (!keyboard_nkro)
  85         UEDATX = 0;
  86     for (uint8_t i = keys_start; i < keys_end; i++) {
  87             UEDATX = report->keys[i];
  88     }
  89     UEINTX = 0x3A;
  90     SREG = intr_state;
  91     return 0;
  92 }