118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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* Copyright (c) 2015, Nordic Semiconductor
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \addtogroup nrf52832-dev Device drivers
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* @{
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*
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* \addtogroup nrf52832-uart UART driver
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* @{
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*
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* \file
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* Contiki compatible UART driver.
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* \author
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* Wojciech Bober <wojciech.bober@nordicsemi.no>
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*/
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#include <stdlib.h>
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#include "nrf.h"
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#include "nrf_drv_config.h"
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#include "nrf_drv_uart.h"
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#include "app_util_platform.h"
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#include "app_error.h"
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#include "contiki.h"
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#include "dev/uart0.h"
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#include "dev/watchdog.h"
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#include "lib/ringbuf.h"
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#define TXBUFSIZE 128
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static uint8_t rx_buffer[1];
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static int (*uart0_input_handler)(unsigned char c);
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static struct ringbuf txbuf;
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static uint8_t txbuf_data[TXBUFSIZE];
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/*---------------------------------------------------------------------------*/
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static void
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uart_event_handler(nrf_drv_uart_event_t * p_event, void * p_context)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if (p_event->type == NRF_DRV_UART_EVT_RX_DONE) {
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if (uart0_input_handler != NULL) {
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uart0_input_handler(p_event->data.rxtx.p_data[0]);
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}
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(void)nrf_drv_uart_rx(rx_buffer, 1);
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} else if (p_event->type == NRF_DRV_UART_EVT_TX_DONE) {
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if (ringbuf_elements(&txbuf) > 0) {
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uint8_t c = ringbuf_get(&txbuf);
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nrf_drv_uart_tx(&c, 1);
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}
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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void
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uart0_set_input(int (*input)(unsigned char c))
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{
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uart0_input_handler = input;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart0_writeb(unsigned char c)
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{
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if (nrf_drv_uart_tx(&c, 1) == NRF_ERROR_BUSY) {
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while (ringbuf_put(&txbuf, c) == 0) {
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__WFE();
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Initialize the RS232 port.
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*
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*/
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void
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uart0_init(unsigned long ubr)
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{
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nrf_drv_uart_config_t config = NRF_DRV_UART_DEFAULT_CONFIG;
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ret_code_t retcode = nrf_drv_uart_init(&config, uart_event_handler);
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APP_ERROR_CHECK(retcode);
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ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
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nrf_drv_uart_rx_enable();
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nrf_drv_uart_rx(rx_buffer, 1);
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}
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/**
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* @}
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* @}
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*/
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