/*
 * This file is part of the libusbhost library
 * hosted at http://github.com/libusbhost/libusbhost
 *
 * Copyright (C) 2015 Amir Hammad <amir.hammad@hotmail.com>
 *
 *
 * libusbhost is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef __SERIAL_H__
#define __SERIAL_H__

#include <stdint.h>
#include <stdarg.h>
#include <errno.h>

struct dma_tx_buf {
    size_t xfr_start; /* Start index of running DMA transfer */
    size_t xfr_end; /* End index of running DMA transfer plus one */
    size_t wr_pos; /* Next index to be written */
    uint8_t data[256];
};

extern volatile struct dma_tx_buf usart_tx_buf;

void usart_dma_init(void);
int usart_dma_fifo_push(volatile struct dma_tx_buf *buf, char c);
void usart_putc(char c);
void usart_send_packet(const uint8_t *data, size_t len);

#endif // __SERIAL_H__