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STM32ArduinoCompat/HardwareSerial.h

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+// ArduinoCompat/HardwareSerial.h
+// STM32 implementation of Arduino compatible serial class
+
+#include <RadioHead.h>
+#if (RH_PLATFORM == RH_PLATFORM_STM32STD)
+#ifndef _HardwareSerial_h
+#define _HardwareSerial_h
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stm32f4xx.h>
+
+#ifndef ARDUINO_RINGBUFFER_SIZE
+#define ARDUINO_RINGBUFFER_SIZE 64
+#endif
+
+class RingBuffer
+{
+public:
+    RingBuffer();
+    bool    isEmpty();
+    bool    isFull();
+    bool    write(uint8_t ch);
+    uint8_t read();
+
+private:
+    uint8_t _buffer[ARDUINO_RINGBUFFER_SIZE]; // In fact we can hold up to ARDUINO_RINGBUFFER_SIZE-1 bytes
+    uint16_t _head;      // Index of next write
+    uint16_t _tail;      // Index of next read
+    uint32_t _overruns;  // Write attempted when buffer full
+    uint32_t _underruns; // Read attempted when buffer empty
+};
+
+// Mostly compatible wuith Arduino HardwareSerial
+// Theres just enough here to support RadioHead RH_Serial
+class HardwareSerial
+{
+public:
+    HardwareSerial(USART_TypeDef* usart);
+    void begin(unsigned long baud);
+    void end();
+    virtual int available(void);
+    virtual int read(void);
+    virtual size_t write(uint8_t);
+    inline size_t write(unsigned long n) { return write((uint8_t)n); }
+    inline size_t write(long n) { return write((uint8_t)n); }
+    inline size_t write(unsigned int n) { return write((uint8_t)n); }
+    inline size_t write(int n) { return write((uint8_t)n); }
+
+    // These need to be public so the IRQ handler can read and write to them:
+    RingBuffer     _rxRingBuffer;
+    RingBuffer     _txRingBuffer;
+
+private:
+    USART_TypeDef* _usart;
+
+};
+
+// Predefined serial ports are configured so:
+// Serial       STM32 UART   RX pin   Tx Pin   Comments
+// Serial1      USART1       PA10     PA9      TX Conflicts with GREEN LED on Discovery
+// Serial2      USART2       PA3      PA2
+// Serial3      USART3       PD9      PD10     
+// Serial4      UART4        PA1      PA0      TX conflicts with USER button on Discovery
+// Serial5      UART5        PD2      PC12     TX conflicts with CS43L22 SDIN on Discovery
+// Serial6      USART6       PC7      PC6      RX conflicts with CS43L22 MCLK on Discovery
+//
+// All ports are idle HIGH, LSB first, 8 bits, No parity, 1 stop bit
+extern HardwareSerial Serial1;
+extern HardwareSerial Serial2;
+extern HardwareSerial Serial3;
+extern HardwareSerial Serial4;
+extern HardwareSerial Serial5;
+extern HardwareSerial Serial6;
+
+#endif
+
+#endif