contiki/cpu/nrf52832/dev/uart0.c

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2016-01-09 13:44:18 +00:00
/*
* Copyright (c) 2015, Nordic Semiconductor
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/**
* \addtogroup nrf52832-dev Device drivers
* @{
*
* \addtogroup nrf52832-uart UART driver
* @{
*
* \file
* Contiki compatible UART driver.
* \author
* Wojciech Bober <wojciech.bober@nordicsemi.no>
*/
#include <stdlib.h>
#include "nrf.h"
#include "nrf_drv_config.h"
#include "nrf_drv_uart.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "contiki.h"
#include "dev/uart0.h"
#include "dev/watchdog.h"
#include "lib/ringbuf.h"
#define TXBUFSIZE 128
static uint8_t rx_buffer[1];
static int (*uart0_input_handler)(unsigned char c);
static struct ringbuf txbuf;
static uint8_t txbuf_data[TXBUFSIZE];
/*---------------------------------------------------------------------------*/
static void
uart_event_handler(nrf_drv_uart_event_t * p_event, void * p_context)
{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if (p_event->type == NRF_DRV_UART_EVT_RX_DONE) {
if (uart0_input_handler != NULL) {
uart0_input_handler(p_event->data.rxtx.p_data[0]);
}
(void)nrf_drv_uart_rx(rx_buffer, 1);
} else if (p_event->type == NRF_DRV_UART_EVT_TX_DONE) {
if (ringbuf_elements(&txbuf) > 0) {
uint8_t c = ringbuf_get(&txbuf);
nrf_drv_uart_tx(&c, 1);
}
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
void
uart0_set_input(int (*input)(unsigned char c))
{
uart0_input_handler = input;
}
/*---------------------------------------------------------------------------*/
void
uart0_writeb(unsigned char c)
{
if (nrf_drv_uart_tx(&c, 1) == NRF_ERROR_BUSY) {
while (ringbuf_put(&txbuf, c) == 0) {
__WFE();
}
}
}
/*---------------------------------------------------------------------------*/
/**
* Initialize the RS232 port.
*
*/
void
uart0_init(unsigned long ubr)
{
nrf_drv_uart_config_t config = NRF_DRV_UART_DEFAULT_CONFIG;
ret_code_t retcode = nrf_drv_uart_init(&config, uart_event_handler);
APP_ERROR_CHECK(retcode);
ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
nrf_drv_uart_rx_enable();
nrf_drv_uart_rx(rx_buffer, 1);
}
/**
* @}
* @}
*/