72 lines
2.1 KiB
C
72 lines
2.1 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 <stdarg.h>
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#include <errno.h>
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#include "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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uint8_t cur_packet;
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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 packet_start[8];
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/* The following may be accessed by anything */
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uint8_t data[512];
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};
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struct __attribute__((__packed__)) ll_pkt {
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uint32_t crc32;
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/* CRC computed over entire packet starting here */
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uint8_t pid;
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uint8_t _pad;
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uint8_t data[];
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};
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enum ctrl_pkt_type {
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CTRL_PKT_RESET = 1,
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CTRL_PKT_ACK = 2,
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CTRL_PKT_RETRANSMIT = 3,
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};
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struct __attribute__((__packed__)) ctrl_pkt {
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uint8_t type;
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uint8_t orig_id;
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};
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extern volatile struct dma_tx_buf usart_tx_buf;
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void usart_dma_init(void);
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int usart_dma_fifo_push(volatile struct dma_tx_buf *buf, uint8_t c);
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int usart_send_packet_nonblocking(struct ll_pkt *pkt, size_t pkt_len);
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int usart_ack_packet(uint8_t idx);
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#endif // __SERIAL_H__
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