Moving USB to Output in preparation for additional Output types.

[kiibohd-controller.git] / Output / pjrcUSB / arm / usb_keyboard.c

diff --git a/Output/pjrcUSB/arm/usb_keyboard.c b/Output/pjrcUSB/arm/usb_keyboard.c
new file mode 100644 (file)
index 0000000..ffe2293
--- /dev/null
+++ b/Output/pjrcUSB/arm/usb_keyboard.c
@@ -0,0 +1,52 @@
+#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;
+}
+