100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2013 Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This library 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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#include <libopencm3/sam3x/usart.h>
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#include <libopencm3/sam3x/pmc.h>
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void usart_set_baudrate(u32 usart, u32 baud)
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{
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USART_BRGR(usart) = pmc_mck_frequency / (16 * baud);
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}
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void usart_set_databits(u32 usart, int bits)
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{
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USART_MR(usart) = (USART_MR(usart) & ~USART_MR_CHRL_MASK) |
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((bits - 5) << 6);
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}
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void usart_set_stopbits(u32 usart, enum usart_stopbits sb)
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{
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USART_MR(usart) = (USART_MR(usart) & ~USART_MR_NBSTOP_MASK) |
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(sb << 12);
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}
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void usart_set_parity(u32 usart, enum usart_parity par)
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{
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USART_MR(usart) = (USART_MR(usart) & ~USART_MR_PAR_MASK) | (par << 9);
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}
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void usart_set_mode(u32 usart, enum usart_mode mode)
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{
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USART_CR(usart) =
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(mode & USART_MODE_RX) ? USART_CR_RXEN : USART_CR_RXDIS;
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USART_CR(usart) =
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(mode & USART_MODE_TX) ? USART_CR_TXEN : USART_CR_TXDIS;
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}
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void usart_set_flow_control(u32 usart, enum usart_flowcontrol fc)
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{
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USART_MR(usart) = (USART_MR(usart) & ~USART_MR_MODE_MASK) |
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(fc ? USART_MR_MODE_HW_HANDSHAKING : 0);
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}
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void usart_enable(u32 usart)
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{
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}
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void usart_disable(u32 usart)
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{
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}
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void usart_send(u32 usart, u16 data)
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{
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USART_THR(usart) = data;
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}
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u16 usart_recv(u32 usart)
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{
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return USART_RHR(usart) & 0x1f;
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}
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void usart_wait_send_ready(u32 usart)
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{
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while ((USART_CSR(usart) & USART_CSR_TXRDY) == 0);
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}
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void usart_wait_recv_ready(u32 usart)
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{
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while ((USART_CSR(usart) & USART_CSR_RXRDY) == 0);
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}
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void usart_send_blocking(u32 usart, u16 data)
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{
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usart_wait_send_ready(usart);
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usart_send(usart, data);
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}
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u16 usart_recv_blocking(u32 usart)
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{
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usart_wait_recv_ready(usart);
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return usart_recv(usart);
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}
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