usb_extra.c

   1 #include <avr/interrupt.h>
   2 #include "usb_extra.h"
   3
   4
   5 int8_t usb_extra_send(uint8_t report_id, uint8_t bits)
   6 {
   7         uint8_t intr_state, timeout;
   8
   9         if (!usb_configured()) return -1;
  10         intr_state = SREG;
  11         cli();
  12         UENUM = EXTRA_ENDPOINT;
  13         timeout = UDFNUML + 50;
  14         while (1) {
  15                 // are we ready to transmit?
  16                 if (UEINTX & (1<<RWAL)) break;
  17                 SREG = intr_state;
  18                 // has the USB gone offline?
  19                 if (!usb_configured()) return -1;
  20                 // have we waited too long?
  21                 if (UDFNUML == timeout) return -1;
  22                 // get ready to try checking again
  23                 intr_state = SREG;
  24                 cli();
  25                 UENUM = EXTRA_ENDPOINT;
  26         }
  27
  28         UEDATX = report_id;
  29         UEDATX = bits;
  30
  31         UEINTX = 0x3A;
  32         SREG = intr_state;
  33         return 0;
  34 }
  35
  36 int8_t usb_extra_audio_send(uint8_t bits)
  37 {
  38         return usb_extra_send(1, bits);
  39 }
  40
  41 int8_t usb_extra_system_send(uint8_t bits)
  42 {
  43         return usb_extra_send(2, bits);
  44 }