mirror of
https://github.com/paparazzi/paparazzi.git
synced 2026-06-04 22:17:01 +08:00
Felix Ruess
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* Copyright (C) 2010 The Paparazzi Team
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*
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* This file is part of paparazzi.
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*
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* paparazzi is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* paparazzi 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with paparazzi; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#include "mcu_periph/uart.h"
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#ifdef USE_UART0
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struct uart_periph uart0;
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#endif
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#ifdef USE_UART1
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struct uart_periph uart1;
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#endif
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#ifdef USE_UART2
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struct uart_periph uart2;
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#endif
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#ifdef USE_UART3
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struct uart_periph uart3;
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#endif
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#ifdef USE_UART5
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struct uart_periph uart5;
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#endif
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void uart_periph_init(struct uart_periph* p) {
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p->rx_insert_idx = 0;
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p->rx_extract_idx = 0;
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p->tx_insert_idx = 0;
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p->tx_extract_idx = 0;
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p->tx_running = FALSE;
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}
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bool_t uart_check_free_space(struct uart_periph* p, uint8_t len) {
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int16_t space = p->tx_extract_idx - p->tx_insert_idx;
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if (space <= 0)
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space += UART_TX_BUFFER_SIZE;
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return (uint16_t)(space - 1) >= len;
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}
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uint8_t uart_getch(struct uart_periph* p) {
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uint8_t ret = p->rx_buf[p->rx_extract_idx];
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p->rx_extract_idx = (p->rx_extract_idx + 1) % UART_RX_BUFFER_SIZE;
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return ret;
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}
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