274 lines
7.0 KiB
C
274 lines
7.0 KiB
C
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2013 PJRC.COM, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* 1. The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* 2. If the Software is incorporated into a build system that allows
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* selection among a list of target devices, then similar target
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* devices manufactured by PJRC.COM must be included in the list of
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* target devices and selectable in the same manner.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "usb_dev.h"
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#include "usb_serial.h"
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#include "core_pins.h" // for yield()
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//#include "HardwareSerial.h"
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#include <string.h> // for memcpy()
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// defined by usb_dev.h -> usb_desc.h
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#if defined(CDC_STATUS_INTERFACE) && defined(CDC_DATA_INTERFACE)
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uint32_t usb_cdc_line_coding[2];
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volatile uint8_t usb_cdc_line_rtsdtr=0;
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volatile uint8_t usb_cdc_transmit_flush_timer=0;
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static usb_packet_t *rx_packet=NULL;
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static usb_packet_t *tx_packet=NULL;
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static volatile uint8_t tx_noautoflush=0;
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#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */
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// get the next character, or -1 if nothing received
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int usb_serial_getchar(void)
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{
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unsigned int i;
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int c;
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if (!rx_packet) {
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if (!usb_configuration) return -1;
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rx_packet = usb_rx(CDC_RX_ENDPOINT);
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if (!rx_packet) return -1;
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}
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i = rx_packet->index;
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c = rx_packet->buf[i++];
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if (i >= rx_packet->len) {
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usb_free(rx_packet);
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rx_packet = NULL;
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} else {
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rx_packet->index = i;
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}
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return c;
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}
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// peek at the next character, or -1 if nothing received
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int usb_serial_peekchar(void)
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{
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if (!rx_packet) {
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if (!usb_configuration) return -1;
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rx_packet = usb_rx(CDC_RX_ENDPOINT);
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if (!rx_packet) return -1;
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}
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if (!rx_packet) return -1;
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return rx_packet->buf[rx_packet->index];
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}
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// number of bytes available in the receive buffer
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int usb_serial_available(void)
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{
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int count;
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count = usb_rx_byte_count(CDC_RX_ENDPOINT);
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if (rx_packet) count += rx_packet->len - rx_packet->index;
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return count;
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}
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// read a block of bytes to a buffer
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int usb_serial_read(void *buffer, uint32_t size)
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{
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uint8_t *p = (uint8_t *)buffer;
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uint32_t qty, count=0;
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while (size) {
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if (!usb_configuration) break;
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if (!rx_packet) {
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rx:
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rx_packet = usb_rx(CDC_RX_ENDPOINT);
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if (!rx_packet) break;
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if (rx_packet->len == 0) {
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usb_free(rx_packet);
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goto rx;
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}
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}
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qty = rx_packet->len - rx_packet->index;
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if (qty > size) qty = size;
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memcpy(p, rx_packet->buf + rx_packet->index, qty);
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p += qty;
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count += qty;
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size -= qty;
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rx_packet->index += qty;
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if (rx_packet->index >= rx_packet->len) {
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usb_free(rx_packet);
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rx_packet = NULL;
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}
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}
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return count;
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}
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// discard any buffered input
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void usb_serial_flush_input(void)
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{
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usb_packet_t *rx;
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if (!usb_configuration) return;
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if (rx_packet) {
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usb_free(rx_packet);
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rx_packet = NULL;
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}
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while (1) {
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rx = usb_rx(CDC_RX_ENDPOINT);
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if (!rx) break;
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usb_free(rx);
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}
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}
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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 8
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// When the PC isn't listening, how long do we wait before discarding data? If this is
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// too short, we risk losing data during the stalls that are common with ordinary desktop
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// software. If it's too long, we stall the user's program when no software is running.
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#define TX_TIMEOUT_MSEC 70
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#if F_CPU == 168000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
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#elif F_CPU == 144000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
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#elif F_CPU == 120000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
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#elif F_CPU == 96000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
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#elif F_CPU == 72000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
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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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// When we've suffered the transmit timeout, don't wait again until the computer
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// begins accepting data. If no software is running to receive, we'll just discard
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// data as rapidly as Serial.print() can generate it, until there's something to
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// actually receive it.
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static uint8_t transmit_previous_timeout=0;
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// transmit a character. 0 returned on success, -1 on error
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int usb_serial_putchar(uint8_t c)
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{
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return usb_serial_write(&c, 1);
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}
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int usb_serial_write(const void *buffer, uint32_t size)
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{
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uint32_t len;
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uint32_t wait_count;
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const uint8_t *src = (const uint8_t *)buffer;
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uint8_t *dest;
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tx_noautoflush = 1;
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while (size > 0) {
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if (!tx_packet) {
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wait_count = 0;
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while (1) {
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if (!usb_configuration) {
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tx_noautoflush = 0;
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return -1;
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}
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if (usb_tx_packet_count(CDC_TX_ENDPOINT) < TX_PACKET_LIMIT) {
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tx_noautoflush = 1;
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tx_packet = usb_malloc();
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if (tx_packet) break;
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tx_noautoflush = 0;
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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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}
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transmit_previous_timeout = 0;
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len = CDC_TX_SIZE - tx_packet->index;
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if (len > size) len = size;
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dest = tx_packet->buf + tx_packet->index;
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tx_packet->index += len;
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size -= len;
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while (len-- > 0) *dest++ = *src++;
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if (tx_packet->index >= CDC_TX_SIZE) {
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tx_packet->len = CDC_TX_SIZE;
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usb_tx(CDC_TX_ENDPOINT, tx_packet);
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tx_packet = NULL;
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}
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usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
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}
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tx_noautoflush = 0;
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return 0;
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}
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void usb_serial_flush_output(void)
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{
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if (!usb_configuration) return;
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tx_noautoflush = 1;
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if (tx_packet) {
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usb_cdc_transmit_flush_timer = 0;
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tx_packet->len = tx_packet->index;
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usb_tx(CDC_TX_ENDPOINT, tx_packet);
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tx_packet = NULL;
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} else {
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usb_packet_t *tx = usb_malloc();
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if (tx) {
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usb_cdc_transmit_flush_timer = 0;
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usb_tx(CDC_TX_ENDPOINT, tx);
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} else {
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usb_cdc_transmit_flush_timer = 1;
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}
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}
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tx_noautoflush = 0;
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}
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void usb_serial_flush_callback(void)
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{
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if (tx_noautoflush) return;
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if (tx_packet) {
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tx_packet->len = tx_packet->index;
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usb_tx(CDC_TX_ENDPOINT, tx_packet);
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tx_packet = NULL;
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} else {
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usb_packet_t *tx = usb_malloc();
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if (tx) {
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usb_tx(CDC_TX_ENDPOINT, tx);
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} else {
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usb_cdc_transmit_flush_timer = 1;
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}
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}
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}
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#endif // CDC_STATUS_INTERFACE && CDC_DATA_INTERFACE
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