+++ /dev/null
-/* Teensyduino Core Library
- * http://www.pjrc.com/teensy/
- * Copyright (c) 2013 PJRC.COM, LLC.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * 1. The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * 2. If the Software is incorporated into a build system that allows
- * selection among a list of target devices, then similar target
- * devices manufactured by PJRC.COM must be included in the list of
- * target devices and selectable in the same manner.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-//#include "mk20dx128.h"
-#include "usb_dev.h"
-#include "usb_seremu.h"
-#include "core_pins.h" // for yield()
-//#include "HardwareSerial.h"
-
-#ifdef SEREMU_INTERFACE // defined by usb_dev.h -> usb_desc.h
-
-volatile uint8_t usb_seremu_transmit_flush_timer=0;
-
-static usb_packet_t *rx_packet=NULL;
-static usb_packet_t *tx_packet=NULL;
-static volatile uint8_t tx_noautoflush=0;
-
-#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */
-
-
-// get the next character, or -1 if nothing received
-int usb_seremu_getchar(void)
-{
- unsigned int i;
- int c;
-
- while (1) {
- if (!usb_configuration) return -1;
- if (!rx_packet) rx_packet = usb_rx(SEREMU_RX_ENDPOINT);
- if (!rx_packet) return -1;
- i = rx_packet->index;
- c = rx_packet->buf[i++];
- if (c) {
- if (i >= rx_packet->len) {
- usb_free(rx_packet);
- rx_packet = NULL;
- } else {
- rx_packet->index = i;
- }
- return c;
- }
- usb_free(rx_packet);
- rx_packet = NULL;
- }
-}
-
-// peek at the next character, or -1 if nothing received
-int usb_seremu_peekchar(void)
-{
- int c;
-
- while (1) {
- if (!usb_configuration) return -1;
- if (!rx_packet) rx_packet = usb_rx(SEREMU_RX_ENDPOINT);
- if (!rx_packet) return -1;
- c = rx_packet->buf[rx_packet->index];
- if (c) return c;
- usb_free(rx_packet);
- rx_packet = NULL;
- }
-}
-
-// number of bytes available in the receive buffer
-int usb_seremu_available(void)
-{
- int i, len, count;
-
- if (!rx_packet) {
- if (usb_configuration) rx_packet = usb_rx(SEREMU_RX_ENDPOINT);
- if (!rx_packet) return 0;
- }
- len = rx_packet->len;
- i = rx_packet->index;
- count = 0;
- for (i = rx_packet->index; i < len; i++) {
- if (rx_packet->buf[i] == 0) break;
- count++;
- }
- if (count == 0) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- return count;
-}
-
-
-// discard any buffered input
-void usb_seremu_flush_input(void)
-{
- usb_packet_t *rx;
-
- if (!usb_configuration) return;
- if (rx_packet) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- while (1) {
- rx = usb_rx(SEREMU_RX_ENDPOINT);
- if (!rx) break;
- usb_free(rx);
- }
-}
-
-
-
-// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
-#define TX_PACKET_LIMIT 6
-
-// When the PC isn't listening, how long do we wait before discarding data? If this is
-// too short, we risk losing data during the stalls that are common with ordinary desktop
-// software. If it's too long, we stall the user's program when no software is running.
-#define TX_TIMEOUT_MSEC 30
-
-#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
-
-// When we've suffered the transmit timeout, don't wait again until the computer
-// begins accepting data. If no software is running to receive, we'll just discard
-// data as rapidly as Serial.print() can generate it, until there's something to
-// actually receive it.
-static uint8_t transmit_previous_timeout=0;
-
-
-// transmit a character. 0 returned on success, -1 on error
-int usb_seremu_putchar(uint8_t c)
-{
- return usb_seremu_write(&c, 1);
-}
-
-
-int usb_seremu_write(const void *buffer, uint32_t size)
-{
-#if 1
- uint32_t len;
- uint32_t wait_count;
- const uint8_t *src = (const uint8_t *)buffer;
- uint8_t *dest;
-
- tx_noautoflush = 1;
- while (size > 0) {
- if (!tx_packet) {
- wait_count = 0;
- while (1) {
- if (!usb_configuration) {
- tx_noautoflush = 0;
- return -1;
- }
- if (usb_tx_packet_count(SEREMU_TX_ENDPOINT) < TX_PACKET_LIMIT) {
- tx_noautoflush = 1;
- tx_packet = usb_malloc();
- if (tx_packet) break;
- }
- if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
- transmit_previous_timeout = 1;
- tx_noautoflush = 0;
- return -1;
- }
- tx_noautoflush = 0;
- yield();
- tx_noautoflush = 1;
- }
- }
- transmit_previous_timeout = 0;
- len = SEREMU_TX_SIZE - tx_packet->index;
- if (len > size) len = size;
- dest = tx_packet->buf + tx_packet->index;
- tx_packet->index += len;
- size -= len;
- while (len-- > 0) *dest++ = *src++;
- if (tx_packet->index < SEREMU_TX_SIZE) {
- usb_seremu_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
- } else {
- tx_packet->len = SEREMU_TX_SIZE;
- usb_seremu_transmit_flush_timer = 0;
- usb_tx(SEREMU_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- }
- }
- tx_noautoflush = 0;
- return 0;
-#endif
-}
-
-void usb_seremu_flush_output(void)
-{
- int i;
-
- if (!usb_configuration) return;
- //serial_print("usb_serial_flush_output\n");
- if (tx_packet && tx_packet->index > 0) {
- usb_seremu_transmit_flush_timer = 0;
- for (i = tx_packet->index; i < SEREMU_TX_SIZE; i++) {
- tx_packet->buf[i] = 0;
- }
- tx_packet->len = SEREMU_TX_SIZE;
- usb_tx(SEREMU_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- }
- // while (usb_tx_byte_count(SEREMU_TX_ENDPOINT) > 0) ; // wait
-}
-
-void usb_seremu_flush_callback(void)
-{
- int i;
- //serial_print("C");
- if (tx_noautoflush) return;
- //serial_print("usb_flush_callback \n");
- for (i = tx_packet->index; i < SEREMU_TX_SIZE; i++) {
- tx_packet->buf[i] = 0;
- }
- tx_packet->len = SEREMU_TX_SIZE;
- usb_tx(SEREMU_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- //serial_print("usb_flush_callback end\n");
-}
-
-#endif // SEREMU_INTERFACE
notaz.gp2x.de / megadrive.git / blobdiff