usart.c

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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2013 Gareth McMullin <gareth@blacksphere.co.nz>
 * Copyright (C) 2015 Daniele Lacamera <root at danielinux.net>
 *
 * This library 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/>.
 */
 
#include <libopencm3/lm3s/usart.h>
 
void usart_send(uint32_t usart, uint16_t data)
{
        USART_DR(usart) = data;
}
 
uint16_t usart_recv(uint32_t usart)
{
        return USART_DR(usart) & 0xff;
}
 
void usart_send_blocking(uint32_t usart, uint16_t data)
{
        while (!usart_is_send_ready(usart));
        usart_send(usart, data);
}
 
bool usart_is_recv_ready(uint32_t usart)
{
        return ((USART_FR(usart) & USART_FR_RXFE) == 0);
}
 
bool usart_is_send_ready(uint32_t usart)
{
        return ((USART_FR(usart) & USART_FR_BUSY) == 0);
}
 
uint16_t usart_recv_blocking(uint32_t usart)
{
        while (!usart_is_recv_ready(usart));
        return usart_recv(usart);
}
 
void usart_enable_rx_interrupt(uint32_t usart)
{
        USART_IM(usart) |= USART_IM_RX;
}
 
void usart_enable_tx_interrupt(uint32_t usart)
{
        USART_IM(usart) |= USART_IM_TX;
}
 
void usart_disable_rx_interrupt(uint32_t usart)
{
        USART_IM(usart) &= (~USART_IM_RX);
}
 
void usart_disable_tx_interrupt(uint32_t usart)
{
        USART_IM(usart) &= (~USART_IM_TX);
}
 
void usart_clear_rx_interrupt(uint32_t usart)
{
        USART_IC(usart) |= USART_IC_RX;
}
 
void usart_clear_tx_interrupt(uint32_t usart)
{
        USART_IC(usart) |= USART_IC_TX;
}
 
bool usart_get_interrupt_source(uint32_t usart, uint32_t flag)
{
        return ((USART_RIS(usart) & flag) != 0);
}