Arti Zirk
054740c5de
subrepo: subdir: "libopencm3" merged: "88e91c9a7cce" upstream: origin: "https://github.com/libopencm3/libopencm3.git" branch: "master" commit: "88e91c9a7cce" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
/** @addtogroup uart_file UART peripheral API
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*
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* @brief <b>Access functions for the UART controller</b>
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*
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* @ingroup peripheral_apis
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2016
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* Maxim Sloyko <maxims@google.com>
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*
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2017-2018 Unicore MX project<dev(at)lists(dot)unicore-mx(dot)org>
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* Copyright (C) 2021 Eduard Drusa <ventyl86(at)netkosice(dot)sk>
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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/nrf/uart.h>
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#include <libopencm3/nrf/gpio.h>
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/**@{*/
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/** @brief Enable the peripheral
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*
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* @param[in] uart uint32_t uart base
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*/
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void uart_enable(uint32_t uart)
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{
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UART_ENABLE(uart) = UART_ENABLE_ENABLED;
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}
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/** @brief Disable the peripheral
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*
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* @param[in] uart uint32_t uart base
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*/
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void uart_disable(uint32_t uart)
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{
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UART_ENABLE(uart) = UART_ENABLE_DISABLED;
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}
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/** @brief Configure UART parameters in single call
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*
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* @details Any pin number can be set to 0xff (or any number larger than UART_MAX_PIN)
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* to disconnect that pin.
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*
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* @param[in] uart uint32_t uart base
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* @param[in] tx_pin uint8_t TX pin number
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* @param[in] rx_pin uint8_t RX pin number
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* @param[in] rts_pin uint8_t RTS pin number
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* @param[in] cts_pin uint8_t CTS pin number
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* @param[in] br enum uart_baud baud rate
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* @param[in] enable_parity bool If true, enable parity bit
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*/
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void uart_configure(uint32_t uart,
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uint32_t tx_pin, uint32_t rx_pin, uint32_t rts_pin, uint32_t cts_pin,
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enum uart_baud br, bool enable_parity)
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{
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uart_set_pins(uart, rx_pin, tx_pin, cts_pin, rts_pin);
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uint32_t reg_config = enable_parity ? UART_CONFIG_PARITY : 0;
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if (rts_pin <= UART_MAX_PIN || cts_pin <= UART_MAX_PIN) {
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reg_config |= UART_CONFIG_HWFC;
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}
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UART_CONFIG(uart) = reg_config;
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uart_set_baudrate(uart, br);
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}
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/** @brief Select GPIO pins to be used by this peripheral.
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*
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* This needs to be configured while UART peripheral is disabled.
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*
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* @param[in] uart uart peripheral base.
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* @param[in] rx RX pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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* @param[in] tx TX pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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* @param[in] cts CTS pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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* @param[in] rts RTS pin. Use GPIO defines in @ref gpio_pin_id or GPIO_UNCONNECTED
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* if signal shall not be connected to any pin.
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*/
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void uart_set_pins(uint32_t uart, uint32_t rx, uint32_t tx, uint32_t cts, uint32_t rts)
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{
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if (rx != GPIO_UNCONNECTED) {
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UART_PSELRXD(uart) = __GPIO2PIN(rx);
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} else {
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UART_PSELRXD(uart) = rx;
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}
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if (tx != GPIO_UNCONNECTED) {
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UART_PSELTXD(uart) = __GPIO2PIN(tx);
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} else {
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UART_PSELTXD(uart) = tx;
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}
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if (cts != GPIO_UNCONNECTED) {
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UART_PSELCTS(uart) = __GPIO2PIN(cts);
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} else {
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UART_PSELCTS(uart) = cts;
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}
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if (rts != GPIO_UNCONNECTED) {
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UART_PSELRTS(uart) = __GPIO2PIN(rts);
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} else {
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UART_PSELRTS(uart) = rts;
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}
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}
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#undef _LOG2
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void uart_set_baudrate(uint32_t uart, enum uart_baud br)
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{
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UART_BAUDRATE(uart) = br;
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}
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void uart_set_parity(uint32_t uart, int parity)
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{
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UART_CONFIG(uart) |= parity ? UART_CONFIG_PARITY : 0;
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}
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void uart_set_flow_control(uint32_t uart, int flow)
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{
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UART_CONFIG(uart) |= flow ? UART_CONFIG_HWFC : 0;
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}
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void uart_start_tx(uint32_t uart)
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{
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PERIPH_TRIGGER_TASK(UART_TASK_STARTTX((uart)));
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}
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void uart_send(uint32_t uart, uint16_t byte)
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{
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UART_TXD((uart)) = byte;
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}
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void uart_stop_tx(uint32_t uart)
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{
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PERIPH_TRIGGER_TASK(UART_TASK_STOPTX((uart)));
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}
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void uart_start_rx(uint32_t uart)
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{
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PERIPH_TRIGGER_TASK(UART_TASK_STARTRX((uart)));
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}
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uint16_t uart_recv(uint32_t uart)
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{
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return UART_RXD(uart);
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}
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void uart_stop_rx(uint32_t uart)
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{
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PERIPH_TRIGGER_TASK(UART_TASK_STOPRX((uart)));
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}
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/**@}*/
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