53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include "usb_dev.h"
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#include "usb_keyboard.h"
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#include <Lib/USBLib.h>
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#include <string.h> // for memcpy()
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// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
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#define TX_PACKET_LIMIT 4
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static uint8_t transmit_previous_timeout=0;
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// When the PC isn't listening, how long do we wait before discarding data?
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#define TX_TIMEOUT_MSEC 50
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#if F_CPU == 96000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
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#elif F_CPU == 48000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
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#elif F_CPU == 24000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
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#endif
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// send the contents of keyboard_keys and keyboard_modifier_keys
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uint8_t usb_keyboard_send(void)
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{
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uint32_t wait_count=0;
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usb_packet_t *tx_packet;
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while (1) {
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if (!usb_configuration) {
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return -1;
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}
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if (usb_tx_packet_count(KEYBOARD_ENDPOINT) < TX_PACKET_LIMIT) {
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tx_packet = usb_malloc();
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if (tx_packet) break;
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}
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if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
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transmit_previous_timeout = 1;
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return -1;
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}
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yield();
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}
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*(tx_packet->buf) = USBKeys_Modifiers;
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*(tx_packet->buf + 1) = 0;
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memcpy(tx_packet->buf + 2, USBKeys_Array, USB_MAX_KEY_SEND);
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tx_packet->len = 8;
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usb_tx(KEYBOARD_ENDPOINT, tx_packet);
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return 0;
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}
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