/*
  Copyright (c) 2017 Daniel Fekete

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/

#ifndef SERIAL_UART_H
#define SERIAL_UART_H

#include "stm32_def.h"
#include "stm32_gpio.h"
#include "Stream.h"

#define BUFFER_SIZE 128

class SerialUART : public Stream  {
  public:
    SerialUART(USART_TypeDef *instance);
    void begin(const uint32_t baud);
    void end(void);
    int available(void);
    int peek(void);
    int read(void);
    void flush(void);
    size_t write(const uint8_t c);
    using Print::write; // pull in write(str) and write(buf, size) from Print
    operator bool() { return true; }; // UART always active

    void stm32SetRX(uint8_t rx);
    void stm32SetTX(uint8_t tx);
    
    USART_TypeDef *instance = NULL;
    UART_HandleTypeDef *handle = NULL;
    
    uint8_t receive_buffer = 0;

    uint8_t *txBuffer = NULL;
    volatile uint8_t txStart = 0;
    volatile uint8_t txEnd = 0;

    uint8_t *rxBuffer = NULL;
    volatile uint8_t rxStart = 0;
    volatile uint8_t rxEnd = 0;

    GPIO_TypeDef *rxPort = NULL;
    uint32_t rxPin = 0;
    GPIO_TypeDef *txPort = NULL;
    uint32_t txPin = 0;
};

#ifdef USART1
extern SerialUART SerialUART1;
#define Serial1 SerialUART1
#endif

#ifdef USART2
extern SerialUART SerialUART2;
#define Serial2 SerialUART2
#endif

#ifdef USART3
extern SerialUART SerialUART3;
#define Serial3 SerialUART3
#endif

#ifdef USART4
extern SerialUART SerialUART4;
#define Serial4 SerialUART4
#endif

#endif // _UART_CLASS_