Arti Zirk
244fdbc35c
subrepo: subdir: "libopencm3" merged: "f5813a54" upstream: origin: "https://github.com/libopencm3/libopencm3" branch: "master" commit: "f5813a54" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
127 lines
3.1 KiB
C
127 lines
3.1 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/sam/usart.h>
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void usart_set_databits(uint32_t 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(uint32_t 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(uint32_t 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(uint32_t 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) = (mode & USART_MODE_TX) ? USART_CR_TXEN
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: USART_CR_TXDIS;
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}
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void usart_set_flow_control(uint32_t 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(uint32_t usart)
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{
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USART_CR(usart) = USART_CR_TXEN | USART_CR_RXEN;
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}
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void usart_disable(uint32_t usart)
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{
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USART_CR(usart) = USART_CR_TXDIS | USART_CR_RXDIS;
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}
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void usart_send(uint32_t usart, uint16_t data)
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{
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USART_THR(usart) = data;
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}
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uint16_t usart_recv(uint32_t 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(uint32_t 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(uint32_t 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(uint32_t usart, uint16_t 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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uint16_t usart_recv_blocking(uint32_t 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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void usart_enable_rx_interrupt(uint32_t usart)
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{
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USART_IER(usart) = USART_CSR_RXRDY;
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}
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void usart_disable_rx_interrupt(uint32_t usart)
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{
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USART_IDR(usart) = USART_CSR_RXRDY;
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}
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void usart_wp_enable(uint32_t usart)
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{
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USART_WPMR(usart) = USART_WPMR_KEY | USART_WPMR_WPEN;
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}
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void usart_wp_disable(uint32_t usart)
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{
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USART_WPMR(usart) = USART_WPMR_KEY & (~USART_WPMR_WPEN);
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}
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void usart_select_clock(uint32_t usart, enum usart_clock clk)
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{
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uint32_t reg_mr = USART_MR(usart) & (~USART_MR_USCLKS_MASK);
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USART_MR(usart) = ((clk << USART_MR_USCLKS_SHIFT) & USART_MR_USCLKS_MASK) | reg_mr;
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}
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void usart_set_character_length(uint32_t usart, enum usart_chrl chrl)
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{
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uint32_t reg_mr = USART_MR(usart) & (~USART_MR_CHRL_MASK);
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USART_MR(usart) = reg_mr | (chrl << USART_MR_CHRL_SHIFT);
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}
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