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src/emsuart.h

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+/*
+ * emsuart.h
+ * Header file for emsuart.cpp
+ * Paul Derbyshire - https://github.com/proddy/EMS-ESP-Boiler
+ */
+#ifndef __EMSUART_H
+#define __EMSUART_H
+
+#include <Arduino.h>
+
+#define EMSUART_UART 0      // UART 0 - there is only one on the esp8266
+#define EMSUART_CONFIG 0x1c // 8N1 (8 bits, no stop bits, 1 parity)
+#define EMSUART_BAUD 9600   // uart baud rate for the EMS circuit
+
+#define EMS_MAXBUFFERS 4      // 4 buffers for circular filling to avoid collisions
+#define EMS_MAXBUFFERSIZE 128 // max size of the buffer. packets are 32 bits
+
+// for how long we drop the Tx signal to create a 11-bit Break of zeros
+// At 9600 baud, 11 bits will be 1144 microseconds
+// the BRK from UBA is roughly 1.039ms, so accounting for hardware lag use 2078 (for half-duplex) - 8 (lag)
+#define EMS_TX_BRK_WAIT 2070
+
+#define EMSUART_recvTaskPrio 1
+#define EMSUART_recvTaskQueueLen 64
+
+typedef struct {
+    int16_t writePtr;
+    uint8_t buffer[EMS_MAXBUFFERSIZE];
+} _EMSRxBuf;
+
+void ICACHE_FLASH_ATTR emsuart_init();
+void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len);
+void ICACHE_FLASH_ATTR emsaurt_tx_poll();
+void ICACHE_FLASH_ATTR emsuart_tx_brk();
+
+#endif