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/*
* 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 <stddef.h>
#include <stdarg.h>
#include <errno.h>
#include <stdbool.h>
#include "sr_global.h"
struct dma_tx_buf {
/* The following fields are accessed only from DMA ISR */
ssize_t xfr_start; /* Start index of running DMA transfer */
ssize_t xfr_end; /* End index of running DMA transfer plus one */
bool wraparound;
ssize_t xfr_next;
/* The following fields are written only from non-interrupt code */
ssize_t wr_pos; /* Next index to be written */
ssize_t wr_idx;
ssize_t chunk_end[8];
/* Make GCC shut up about the zero-size array member. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
/* Written outside ISR by usart_send_chunk_nonblocking, read via DMA */
uint8_t data[0];
#pragma GCC diagnostic pop
};
struct usart_desc {
struct dma_tx_buf tx_buf;
uint8_t data[512];
uint32_t tx_chunk_overruns, tx_byte_overruns;
uint32_t tx_errors;
volatile uint8_t rx_buf[32];
int comm_led;
USART_TypeDef *le_usart;
int le_usart_irqn;
DMA_Stream_TypeDef *tx_dmas;
int tx_dma_sn;
int tx_dma_ch;
DMA_TypeDef *tx_dma;
int tx_dma_irqn;
};
void usart_dma_init(volatile struct usart_desc *us, unsigned int baudrate);
int usart_send_chunk_nonblocking(volatile struct usart_desc *us, const char *chunk, size_t chunk_len);
int usart_putc_nonblocking(volatile struct usart_desc *us, char c);
int usart_putc_blocking(volatile struct usart_desc *us, char c);
void usart_dma_stream_irq(volatile struct usart_desc *us);
int usart_flush(volatile struct usart_desc *us);
int usart_printf(volatile struct usart_desc *us, char *fmt, ...);
int usart_printf_blocking(volatile struct usart_desc *us, char *fmt, ...);
#endif // __SERIAL_H__
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