85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/*
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* This file is part of the libusbhost library
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* hosted at http://github.com/libusbhost/libusbhost
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*
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* Copyright (C) 2015 Amir Hammad <amir.hammad@hotmail.com>
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*
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*
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* libusbhost is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __SERIAL_H__
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#define __SERIAL_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <stdbool.h>
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#include "sr_global.h"
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struct dma_tx_buf {
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/* The following fields are accessed only from DMA ISR */
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ssize_t xfr_start; /* Start index of running DMA transfer */
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ssize_t xfr_end; /* End index of running DMA transfer plus one */
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bool wraparound;
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ssize_t xfr_next;
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/* The following fields are written only from non-interrupt code */
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ssize_t wr_pos; /* Next index to be written */
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ssize_t wr_idx;
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ssize_t chunk_end[8];
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/* Make GCC shut up about the zero-size array member. */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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/* Written outside ISR by usart_send_chunk_nonblocking, read via DMA */
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uint8_t data[0];
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#pragma GCC diagnostic pop
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};
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struct usart_desc {
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struct dma_tx_buf tx_buf;
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uint8_t data[512];
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uint32_t tx_chunk_overruns, tx_byte_overruns;
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uint32_t tx_errors;
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volatile uint8_t rx_buf[32];
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int comm_led;
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USART_TypeDef *le_usart;
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int le_usart_irqn;
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DMA_Stream_TypeDef *tx_dmas;
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int tx_dma_sn;
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int tx_dma_ch;
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DMA_TypeDef *tx_dma;
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int tx_dma_irqn;
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};
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void usart_dma_init(volatile struct usart_desc *us, unsigned int baudrate);
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int usart_send_chunk_nonblocking(volatile struct usart_desc *us, const char *chunk, size_t chunk_len);
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int usart_putc_nonblocking(volatile struct usart_desc *us, char c);
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int usart_putc_blocking(volatile struct usart_desc *us, char c);
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void usart_dma_stream_irq(volatile struct usart_desc *us);
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int usart_flush(volatile struct usart_desc *us);
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int usart_printf(volatile struct usart_desc *us, const char *fmt, ...);
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int usart_printf_blocking(volatile struct usart_desc *us, const char *fmt, ...);
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int usart_printf_blocking_va(volatile struct usart_desc *us, const char *fmt, va_list va);
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#endif // __SERIAL_H__
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