VirtIOSerial.h

 
#ifndef _VIRTIOSERIAL_H_
#define _VIRTIOSERIAL_H_
 
#if defined (VIRTIOCON)
#include "Stream.h"
#include "openamp.h"
#include "wiring.h"
#include "virtio_buffer.h"
 
//================================================================================
// Serial over OpenAMP
 
// This structure is used to be able to get VirtIOSerial instance (C++ class)
// from handler (C structure) specially for rpmsg message management
typedef struct  {
  // Those 2 first fields must remain in this order at the beginning of the structure
  void    *__this;
  VIRT_UART_HandleTypeDef handle;
  bool initialized;
  bool first_message_discarded;
  virtio_buffer_t ring;
} VirtIOSerialObj_t;
 
 
class VirtIOSerial : public Stream {
  public:
    void begin(void);
    void begin(uint32_t);
    void begin(uint32_t, uint8_t);
    void end(void);
 
    virtual int available(void);
    virtual int availableForWrite(void);
    virtual int peek(void);
    virtual int read(void);
    virtual size_t readBytes(char *buffer, size_t length);  // read chars from stream into buffer
    virtual size_t write(uint8_t);
    virtual size_t write(const uint8_t *buffer, size_t size);
    virtual void flush(void);
 
    static void rxGenericCallback(VIRT_UART_HandleTypeDef *huart);
    void rxCallback(VIRT_UART_HandleTypeDef *huart);
 
    using Print::write; // pull in write(str) from Print
    operator bool(void)
    {
      return true;
    }
 
  private:
    static uint32_t VirtIOSerial_index;
    VirtIOSerialObj_t _VirtIOSerialObj;
    void checkMessageFromISR(void);
};
 
extern VirtIOSerial SerialVirtIO;
 
#endif /* VIRTIOCON */
#endif /* _VIRTIOSERIAL_H_ */