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+/**
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+ * Marlin 3D Printer Firmware
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+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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+ *
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+ * Based on Sprinter and grbl.
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+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+#ifdef ARDUINO_ARCH_ESP32
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+
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+#include "../../inc/MarlinConfig.h"
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+
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+#if ENABLED(WIFISUPPORT)
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+
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+#include "WebSocketSerial.h"
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+#include "wifi.h"
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+
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+#include <AsyncTCP.h>
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+#include <ESPAsyncWebServer.h>
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+
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+struct ring_buffer_r {
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+ unsigned char buffer[RX_BUFFER_SIZE];
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+ volatile ring_buffer_pos_t head, tail;
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+};
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+
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+struct ring_buffer_t {
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+ unsigned char buffer[256];
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+ volatile uint8_t head, tail;
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+};
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+
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+ring_buffer_r rx_buffer = { { 0 }, 0, 0 };
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+ring_buffer_t tx_buffer = { { 0 }, 0, 0 };
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+
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+static bool _written;
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+
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+#if ENABLED(EMERGENCY_PARSER)
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+ static EmergencyParser::State emergency_state; // = EP_RESET
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+#endif
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+
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+AsyncWebSocket ws("/ws"); // access at ws://[esp ip]/ws
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+
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+FORCE_INLINE int next_rx_index(const int i) { return (ring_buffer_pos_t)(i + 1) & (ring_buffer_pos_t)(RX_BUFFER_SIZE - 1); }
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+FORCE_INLINE int next_tx_index(const int i) { return (ring_buffer_pos_t)(i + 1) & (ring_buffer_pos_t)(TX_BUFFER_SIZE - 1); }
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+
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+static void addToBuffer(uint8_t * const data, const size_t len) {
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+ for (size_t i = 0; i < len; i++) {
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+ ring_buffer_pos_t h = rx_buffer.head;
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+ const ring_buffer_pos_t t = rx_buffer.tail, n = next_rx_index(h);
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+
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+ if (n != t) { rx_buffer.buffer[h] = data[i]; h = n; }
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+
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+ // TODO: buffer is full, handle?
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+
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+ rx_buffer.head = h;
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+ }
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+}
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+
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+// Handle WebSocket event
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+static void onEvent(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len) {
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+ switch (type) {
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+ case WS_EVT_CONNECT: client->ping(); break; // client connected
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+ case WS_EVT_DISCONNECT: // client disconnected
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+ case WS_EVT_ERROR: // error was received from the other end
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+ case WS_EVT_PONG: break; // pong message was received (in response to a ping request maybe)
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+ case WS_EVT_DATA: { // data packet
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+ AwsFrameInfo * info = (AwsFrameInfo*)arg;
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+ if (info->opcode == WS_TEXT || info->message_opcode == WS_TEXT)
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+ addToBuffer(data, len);
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+ }
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+ }
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+}
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+
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+// Public Methods
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+void WebSocketSerial::begin(const long baud_setting) {
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+ ws.onEvent(onEvent);
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+ server.addHandler(&ws); // attach AsyncWebSocket
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+}
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+
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+void WebSocketSerial::end() { }
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+
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+int WebSocketSerial::peek(void) {
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+ const int v = rx_buffer.head == rx_buffer.tail ? -1 : rx_buffer.buffer[rx_buffer.tail];
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+ return v;
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+}
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+
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+int WebSocketSerial::read(void) {
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+ const ring_buffer_pos_t h = rx_buffer.head, t = rx_buffer.tail;
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+ if (h == t) return -1; // Nothing to read? Return now
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+
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+ const int v = rx_buffer.buffer[t];
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+
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+ rx_buffer.tail = (ring_buffer_pos_t)(t + 1) & (RX_BUFFER_SIZE - 1); // Advance tail
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+
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+ return v;
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+}
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+
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+bool WebSocketSerial::available(void) {
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+ const ring_buffer_pos_t h = rx_buffer.head, t = rx_buffer.tail;
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+ return (ring_buffer_pos_t)(RX_BUFFER_SIZE + h - t) & (RX_BUFFER_SIZE - 1);
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+}
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+
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+void WebSocketSerial::flush(void) {
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+ ws.textAll("flush");
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+ rx_buffer.tail = rx_buffer.head;
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+}
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+
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+#if TX_BUFFER_SIZE
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+
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+ void WebSocketSerial::write(const uint8_t c) {
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+ _written = true;
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+
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+ const uint8_t i = (tx_buffer.head + 1) & (TX_BUFFER_SIZE - 1);
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+
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+ // Store new char. head is always safe to move
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+ tx_buffer.buffer[tx_buffer.head] = c;
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+ tx_buffer.head = i;
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+
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+ if (c == '\n') {
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+ ws.textAll(tx_buffer.buffer, tx_buffer.head);
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+ tx_buffer.head = 0;
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+ }
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+ }
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+
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+ void WebSocketSerial::flushTx(void) {
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+ ws.textAll("flushTx");
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+ if (!_written) return;
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+ }
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+
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+#else
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+
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+ //void WebSocketSerial::write(const uint8_t c) { _written = true; }
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+ //void WebSocketSerial::flushTx(void) { if (!_written) return; }
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+
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+#endif
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+
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+/**
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+ * Imports from print.h
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+ */
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+
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+void WebSocketSerial::print(char c, int base) { print((long)c, base); }
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+void WebSocketSerial::print(unsigned char b, int base) { print((unsigned long)b, base); }
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+void WebSocketSerial::print(int n, int base) { print((long)n, base); }
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+void WebSocketSerial::print(unsigned int n, int base) { print((unsigned long)n, base); }
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+void WebSocketSerial::print(long n, int base) {
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+ if (base == 0)
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+ write(n);
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+ else if (base == 10) {
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+ if (n < 0) { print('-'); n = -n; }
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+ printNumber(n, 10);
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+ }
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+ else
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+ printNumber(n, base);
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+}
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+
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+void WebSocketSerial::print(unsigned long n, int base) {
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+ if (base == 0) write(n); else printNumber(n, base);
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+}
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+
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+void WebSocketSerial::print(double n, int digits) { printFloat(n, digits); }
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+
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+void WebSocketSerial::println(void) { print('\r'); print('\n'); }
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+void WebSocketSerial::println(const String& s) { print(s); println(); }
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+void WebSocketSerial::println(const char c[]) { print(c); println(); }
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+void WebSocketSerial::println(char c, int base) { print(c, base); println(); }
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+void WebSocketSerial::println(unsigned char b, int base) { print(b, base); println(); }
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+void WebSocketSerial::println(int n, int base) { print(n, base); println(); }
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+void WebSocketSerial::println(unsigned int n, int base) { print(n, base); println(); }
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+void WebSocketSerial::println(long n, int base) { print(n, base); println(); }
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+void WebSocketSerial::println(unsigned long n, int base) { print(n, base); println(); }
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+void WebSocketSerial::println(double n, int digits) { print(n, digits); println(); }
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+
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+// Private Methods
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+
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+void WebSocketSerial::printNumber(unsigned long n, uint8_t base) {
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+ if (n) {
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+ unsigned char buf[8 * sizeof(long)]; // Enough space for base 2
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+ int8_t i = 0;
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+ while (n) {
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+ buf[i++] = n % base;
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+ n /= base;
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+ }
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+ while (i--)
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+ print((char)(buf[i] + (buf[i] < 10 ? '0' : 'A' - 10)));
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+ }
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+ else
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+ print('0');
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+}
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+
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+void WebSocketSerial::printFloat(double number, uint8_t digits) {
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+ // Handle negative numbers
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+ if (number < 0.0) { print('-'); number = -number; }
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+
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+ // Round correctly so that print(1.999, 2) prints as "2.00"
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+ // Use a lookup table for performance
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+ constexpr double rounds[] = { 0.5, 0.05, 0.005, 0.0005, 0.00005, 0.000005, 0.0000005, 0.00000005 };
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+ number += rounds[digits];
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+
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+ //number += pow(10, -(digits + 1)); // slower single-line equivalent
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+
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+ // Extract the integer part of the number and print it
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+ unsigned long int_part = (unsigned long)number;
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+ print(int_part);
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+
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+ // Print the decimal point, but only if there are digits beyond
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+ double remainder = number - (double)int_part;
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+ if (digits) {
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+ print('.');
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+ // Extract digits from the remainder one at a time
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+ while (digits--) {
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+ remainder *= 10.0;
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+ const int toPrint = int(remainder);
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+ print(toPrint);
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+ remainder -= toPrint;
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+ }
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+ }
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+}
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+
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+#endif // WIFISUPPORT
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+#endif // ARDUINO_ARCH_ESP32
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Hadrien Jouet