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