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- /* Teensyduino Core Library
- * http://www.pjrc.com/teensy/
- * Copyright (c) 2017 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 "usb_dev.h"
- #include "usb_serial.h"
- #include "core_pins.h"// for delay()
- //#include "HardwareSerial.h"
- #include <string.h> // for memcpy()
-
- #include "debug/printf.h"
- #include "core_pins.h"
-
- // defined by usb_dev.h -> usb_desc.h
- #if defined(CDC_STATUS_INTERFACE) && defined(CDC_DATA_INTERFACE)
- //#if F_CPU >= 20000000
-
- uint32_t usb_cdc_line_coding[2];
- volatile uint32_t usb_cdc_line_rtsdtr_millis;
- volatile uint8_t usb_cdc_line_rtsdtr=0;
- volatile uint8_t usb_cdc_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_serial_getchar(void)
- {
- #if 0
- unsigned int i;
- int c;
-
- if (!rx_packet) {
- if (!usb_configuration) return -1;
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) return -1;
- }
- i = rx_packet->index;
- c = rx_packet->buf[i++];
- if (i >= rx_packet->len) {
- usb_free(rx_packet);
- rx_packet = NULL;
- } else {
- rx_packet->index = i;
- }
- return c;
- #endif
- return -1;
- }
-
- // peek at the next character, or -1 if nothing received
- int usb_serial_peekchar(void)
- {
- #if 0
- if (!rx_packet) {
- if (!usb_configuration) return -1;
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) return -1;
- }
- if (!rx_packet) return -1;
- return rx_packet->buf[rx_packet->index];
- #endif
- return -1;
- }
-
- // number of bytes available in the receive buffer
- int usb_serial_available(void)
- {
- #if 0
- int count;
- count = usb_rx_byte_count(CDC_RX_ENDPOINT);
- if (rx_packet) count += rx_packet->len - rx_packet->index;
- return count;
- #endif
- return 0;
- }
-
- // read a block of bytes to a buffer
- int usb_serial_read(void *buffer, uint32_t size)
- {
- #if 0
- uint8_t *p = (uint8_t *)buffer;
- uint32_t qty, count=0;
-
- while (size) {
- if (!usb_configuration) break;
- if (!rx_packet) {
- rx:
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) break;
- if (rx_packet->len == 0) {
- usb_free(rx_packet);
- goto rx;
- }
- }
- qty = rx_packet->len - rx_packet->index;
- if (qty > size) qty = size;
- memcpy(p, rx_packet->buf + rx_packet->index, qty);
- p += qty;
- count += qty;
- size -= qty;
- rx_packet->index += qty;
- if (rx_packet->index >= rx_packet->len) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- }
- return count;
- #endif
- return 0;
- }
-
- // discard any buffered input
- void usb_serial_flush_input(void)
- {
- #if 0
- usb_packet_t *rx;
-
- if (!usb_configuration) return;
- if (rx_packet) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- while (1) {
- rx = usb_rx(CDC_RX_ENDPOINT);
- if (!rx) break;
- usb_free(rx);
- }
- #endif
- }
-
- // Maximum number of transmit packets to queue so we don't starve other endpoints for memory
- //#define TX_PACKET_LIMIT 8
-
- // 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 70
-
- /*#if F_CPU == 240000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1600)
- #elif F_CPU == 216000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1440)
- #elif F_CPU == 192000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1280)
- #elif F_CPU == 180000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1200)
- #elif F_CPU == 168000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
- #elif F_CPU == 144000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
- #elif F_CPU == 120000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
- #elif F_CPU == 96000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
- #elif F_CPU == 72000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
- #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_serial_putchar(uint8_t c)
- {
- return usb_serial_write(&c, 1);
- }
-
-
- static transfer_t volatile transfer __attribute__ ((used, aligned(32)));
- static uint8_t txbuffer[1024];
- //static uint8_t txbuffer1[1024];
- //static uint8_t txbuffer2[1024];
- //static uint8_t txstate=0;
-
- int usb_serial_write(const void *buffer, uint32_t size)
- {
- if (!usb_configuration) return 0;
- // TODO: do something so much better that this quick hack....
- if (size > sizeof(txbuffer)) size = sizeof(txbuffer);
- int count=0;
- //digitalWriteFast(13, HIGH);
- while (1) {
- uint32_t status = (volatile)(transfer.status);
- if (count > 10) printf("status = %x\n", status);
- if (!(status & 0x80)) break;
- count++;
- //if (count > 50) break; // TODO: proper timout?
- // TODO: check for USB offline
- delayMicroseconds(5); // polling too quickly seem to block DMA - maybe DTCM issue?
- }
- //digitalWriteFast(13, LOW);
- delayMicroseconds(1); // TODO: this must not be the answer!
- memcpy(txbuffer, buffer, size);
- usb_prepare_transfer(&transfer, txbuffer, size, 0);
- usb_transmit(CDC_TX_ENDPOINT, &transfer);
-
- #if 0
- uint32_t ret = size;
- 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(CDC_TX_ENDPOINT) < TX_PACKET_LIMIT) {
- tx_noautoflush = 1;
- tx_packet = usb_malloc();
- if (tx_packet) break;
- tx_noautoflush = 0;
- }
- if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
- transmit_previous_timeout = 1;
- return -1;
- }
- yield();
- }
- }
- transmit_previous_timeout = 0;
- len = CDC_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 >= CDC_TX_SIZE) {
- tx_packet->len = CDC_TX_SIZE;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- }
- usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
- }
- tx_noautoflush = 0;
- return ret;
- #endif
- return 0;
- }
-
- int usb_serial_write_buffer_free(void)
- {
- #if 0
- uint32_t len;
-
- tx_noautoflush = 1;
- if (!tx_packet) {
- if (!usb_configuration ||
- usb_tx_packet_count(CDC_TX_ENDPOINT) >= TX_PACKET_LIMIT ||
- (tx_packet = usb_malloc()) == NULL) {
- tx_noautoflush = 0;
- return 0;
- }
- }
- len = CDC_TX_SIZE - tx_packet->index;
- // TODO: Perhaps we need "usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT"
- // added here, so the SOF interrupt can't take away the available buffer
- // space we just promised the user could write without blocking?
- // But does this come with other performance downsides? Could it lead to
- // buffer data never actually transmitting in some usage cases? More
- // investigation is needed.
- // https://github.com/PaulStoffregen/cores/issues/10#issuecomment-61514955
- tx_noautoflush = 0;
- return len;
- #endif
- return 0;
- }
-
- void usb_serial_flush_output(void)
- {
- #if 0
- if (!usb_configuration) return;
- tx_noautoflush = 1;
- if (tx_packet) {
- usb_cdc_transmit_flush_timer = 0;
- tx_packet->len = tx_packet->index;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- } else {
- usb_packet_t *tx = usb_malloc();
- if (tx) {
- usb_cdc_transmit_flush_timer = 0;
- usb_tx(CDC_TX_ENDPOINT, tx);
- } else {
- usb_cdc_transmit_flush_timer = 1;
- }
- }
- tx_noautoflush = 0;
- #endif
- }
-
- void usb_serial_flush_callback(void)
- {
- #if 0
- if (tx_noautoflush) return;
- if (tx_packet) {
- tx_packet->len = tx_packet->index;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- } else {
- usb_packet_t *tx = usb_malloc();
- if (tx) {
- usb_tx(CDC_TX_ENDPOINT, tx);
- } else {
- usb_cdc_transmit_flush_timer = 1;
- }
- }
- #endif
- }
-
-
-
- //#endif // F_CPU
- #endif // CDC_STATUS_INTERFACE && CDC_DATA_INTERFACE
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