initial commit

src/uart/emsuart_esp32.h

@@ -0,0 +1,71 @@
+/*
+ * EMS-ESP - https://github.com/proddy/EMS-ESP
+ * Copyright 2019  Paul Derbyshire
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EMSESP_EMSUART_H
+#define EMSESP_EMSUART_H
+
+#include <Arduino.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/ringbuf.h"
+#include "freertos/queue.h"
+#include <driver/uart.h>
+
+#define EMS_MAXBUFFERSIZE 34 // max size of the buffer. EMS packets are max 32 bytes, plus extra 2 for BRKs
+
+#define EMSUART_UART UART_NUM_2 // UART 0 --> Changed to 2 for ESP32 // To do: Adapt
+#define EMSUART_RXPIN 17        // To do: Adapt seems to be IO17 for ESP32 UART2 RX pin
+#define EMSUART_TXPIN 16        // To do: Adapt seems to be IO16 for ESP32 UART2 TX pin
+//#define EMSUART_CONFIG 0x1C // 8N1 (8 bits, no parity, 1 stopbit)
+#define EMSUART_BAUD 9600 // uart baud rate for the EMS circuit
+#define EMSUART_RXBUFSIZE (2 * UART_FIFO_LEN)
+#define EMSUART_BREAKBITS 11 // 11 bits break signal
+
+#define EMS_TXMODE_DEFAULT 1
+#define EMS_TXMODE_EMSPLUS 2
+#define EMS_TXMODE_HT3 3
+
+namespace emsesp {
+
+typedef enum {
+    EMS_TX_STATUS_OK = 1,
+    EMS_TX_WTD_TIMEOUT, // watchdog timeout during send
+    EMS_TX_BRK_DETECT,  // incoming BRK during Tx
+} EMSUART_STATUS;
+
+class EMSuart {
+  public:
+    EMSuart()  = default;
+    ~EMSuart() = default;
+
+    static void           start(uint8_t tx_mode);
+    static void           send_poll(uint8_t data);
+    static EMSUART_STATUS transmit(uint8_t * buf, uint8_t len);
+
+    static void stop(){};    // not used with ESP32
+    static void restart(){}; // not used with ESP32
+
+  private:
+    static void emsuart_recvTask(void * param);
+    static void emsuart_parseTask(void * param);
+};
+
+} // namespace emsesp
+
+#endif