34 lines
654 B
C
34 lines
654 B
C
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#include <avr/interrupt.h>
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#include "usb_extra.h"
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int8_t usb_extra_send(uint8_t bits)
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{
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uint8_t 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 = EXTRA_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 = EXTRA_ENDPOINT;
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}
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UEDATX = 1; // report id
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UEDATX = bits;
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UEINTX = 0x3A;
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SREG = intr_state;
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return 0;
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}
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