pjrc/usb_extra.c

   1 #include <util/delay.h>
   2 #include <avr/interrupt.h>
   3 #include "host.h"
   4 #include "usb_extra.h"
   5
   6
   7 int8_t usb_extra_send(uint8_t report_id, uint16_t data)
   8 {
   9         uint8_t intr_state, timeout;
  10
  11         if (!usb_configured()) return -1;
  12         intr_state = SREG;
  13         cli();
  14         UENUM = EXTRA_ENDPOINT;
  15         timeout = UDFNUML + 50;
  16         while (1) {
  17                 // are we ready to transmit?
  18                 if (UEINTX & (1<<RWAL)) break;
  19                 SREG = intr_state;
  20                 // has the USB gone offline?
  21                 if (!usb_configured()) return -1;
  22                 // have we waited too long?
  23                 if (UDFNUML == timeout) return -1;
  24                 // get ready to try checking again
  25                 intr_state = SREG;
  26                 cli();
  27                 UENUM = EXTRA_ENDPOINT;
  28         }
  29
  30         UEDATX = report_id;
  31         UEDATX = data&0xFF;
  32         UEDATX = (data>>8)&0xFF;
  33
  34         UEINTX = 0x3A;
  35         SREG = intr_state;
  36         return 0;
  37 }
  38
  39 int8_t usb_extra_consumer_send(uint16_t bits)
  40 {
  41         return usb_extra_send(REPORT_ID_CONSUMER, bits);
  42 }
  43
  44 int8_t usb_extra_system_send(uint16_t bits)
  45 {
  46         return usb_extra_send(REPORT_ID_SYSTEM, bits);
  47 }