uart.h

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/* 
TODO
- Overflow handling, etc. for Rx Queue.
*/
 
#pragma once
#ifndef DSY_UART_H
#define DSY_UART_H 
#include "daisy_core.h"
 
 
namespace daisy
{
class UartHandler
{
  public:
    struct Config
    {
        enum class Peripheral
        {
            USART_1,
            USART_2,
            USART_3,
            UART_4,
            UART_5,
            USART_6,
            UART_7,
            UART_8,
            LPUART_1,
        };
 
        enum class StopBits
        {
            BITS_0_5,
            BITS_1,
            BITS_1_5,
            BITS_2,
        };
 
        enum class Parity
        {
            NONE,
            EVEN,
            ODD,
        };
 
        enum class Mode
        {
            RX,
            TX,
            TX_RX,
        };
 
        enum class WordLength
        {
            BITS_7,
            BITS_8,
            BITS_9,
        };
 
        struct
        {
            dsy_gpio_pin tx; 
            dsy_gpio_pin rx; 
        } pin_config;        
        Config()
        {
            // user must init periph, pin_config, and mode
            stopbits   = StopBits::BITS_1;
            parity     = Parity::NONE;
            wordlength = WordLength::BITS_8;
            baudrate   = 31250;
        }
 
        Peripheral periph;
        StopBits   stopbits;
        Parity     parity;
        Mode       mode;
        WordLength wordlength;
        uint32_t   baudrate;
    };
 
 
    UartHandler() : pimpl_(nullptr) {}
    UartHandler(const UartHandler& other) = default;
    UartHandler& operator=(const UartHandler& other) = default;
 
    enum class Result
    {
        OK, 
        ERR 
    };
 
    enum class DmaDirection
    {
        RX, 
        TX  
    };
 
    Result Init(const Config& config);
 
    const Config& GetConfig() const;
 
    typedef void (*StartCallbackFunctionPtr)(void* context);
    typedef void (*EndCallbackFunctionPtr)(void* context, Result result);
 
    typedef void (*CircularRxCallbackFunctionPtr)(uint8_t* data,
                                                  size_t   size,
                                                  void*    context,
                                                  Result   result);
 
    Result BlockingTransmit(uint8_t* buff, size_t size, uint32_t timeout = 100);
 
    Result
    BlockingReceive(uint8_t* buffer, uint16_t size, uint32_t timeout = 100);
 
    Result DmaTransmit(uint8_t*                              buff,
                       size_t                                size,
                       UartHandler::StartCallbackFunctionPtr start_callback,
                       UartHandler::EndCallbackFunctionPtr   end_callback,
                       void*                                 callback_context);
 
    Result DmaReceive(uint8_t*                              buff,
                      size_t                                size,
                      UartHandler::StartCallbackFunctionPtr start_callback,
                      UartHandler::EndCallbackFunctionPtr   end_callback,
                      void*                                 callback_context);
 
    Result DmaListenStart(uint8_t*                      buff,
                          size_t                        size,
                          CircularRxCallbackFunctionPtr cb,
                          void*                         callback_context);
 
    Result DmaListenStop();
 
    bool IsListening() const;
 
    int CheckError();
 
    int PollReceive(uint8_t* buff, size_t size, uint32_t timeout);
 
    Result PollTx(uint8_t* buff, size_t size);
 
    class Impl; 
  private:
    Impl* pimpl_;
};
 
extern "C"
{
    void dsy_uart_global_init();
};
 
} // namespace daisy
 
#endif