connector_uart_dma.h

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/*
 * @file connector_uart_dma.h
 *
 * @date Jun 21, 2020
 * @author Andrey Belomutskiy, (c) 2012-2020
 */
 
#pragma once
#include "global.h"
#include "tunerstudio_io.h"
 
#if HAL_USE_UART && EFI_USE_UART_DMA
 
// See uart_dma_s
#define TS_FIFO_BUFFER_SIZE (BLOCKING_FACTOR + 30)
// This must be a power of 2!
#define TS_DMA_BUFFER_SIZE 32
 
class UartDmaTsChannel final : public UartTsChannel {
public:
    UartDmaTsChannel(UARTDriver& uartDriver);
 
    void start(uint32_t baud) override;
 
    // Override only read from UartTsChannel
    size_t readTimeout(uint8_t* buffer, size_t size, int timeout) override;
 
    void copyDataFromDMA();
 
private:
    // RX FIFO implementation
    // circular DMA buffer
    uint8_t dmaBuffer[TS_DMA_BUFFER_SIZE];
    // current read position for the DMA buffer
    volatile int readPos;
    // secondary FIFO buffer for async. transfer
    uint8_t buffer[TS_FIFO_BUFFER_SIZE];
    // input FIFO Rx queue
    input_queue_t fifoRxQueue;
};
 
#endif // HAL_USE_UART && EFI_USE_UART_DMA