260 lines
9 KiB
C
260 lines
9 KiB
C
/*
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* Copyright (c) 2015 NXP B.V.
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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 NXP B.V. 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 NXP B.V. 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 NXP B.V. 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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* This file is part of the Contiki operating system.
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*
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* Author: Theo van Daele <theo.van.daele@nxp.com>
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*
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*/
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#include "contiki.h"
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#include "net/ipv6/uip-ds6.h"
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#include "net/ip/uip.h"
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#include "net/linkaddr.h"
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#include "rpl-tools.h"
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#include "rest-engine.h"
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#include "sys/ctimer.h"
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#include "dev/uart-driver.h"
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#include "uart1.h"
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#include <AppHardwareApi.h>
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static void get_coap_rx_uart1_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
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static void event_coap_rx_uart1_handler(void);
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static void put_post_tx_uart1_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
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static void string2uart1(uint8_t *c);
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static int handleRxChar(uint8_t c);
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static int get_ringbuf(uint8_t *c);
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static int put_ringbuf(uint8_t c);
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/* COAP helpers */
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static char content[REST_MAX_CHUNK_SIZE];
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static int content_len = 0;
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#define CONTENT_PRINTF(...) { if(content_len < sizeof(content)) content_len += snprintf(content+content_len, sizeof(content)-content_len, __VA_ARGS__); }
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/* Ringbuf: written to by uart isr. Size must be power of 2 */
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#define RINGBUF_SIZE 32
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#define RINGBUF_MAX_INDEX (RINGBUF_SIZE-1)
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static char ringbuf[RINGBUF_SIZE];
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static int head_index = 1; /* index to write next data */
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static int tail_index = 0; /* index where last read took place */
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/* String aligned buffer */
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#define RX_BUFFER_SIZE RINGBUF_SIZE
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static uint8_t rx_buf[RX_BUFFER_SIZE+1];
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static uint8_t rx_buf_index = 0; /* index for rx_buf */
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/*---------------------------------------------------------------------------*/
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PROCESS(start_app, "START_APP");
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PROCESS(rx_data_process, "RX_DATA");
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AUTOSTART_PROCESSES(&start_app, &rx_data_process);
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/*---------------------------------------------------------------------------*/
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/*********** COAP resources *************************************************/
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/*****************************************************************************/
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/* Observable resource and event handler to obtain terminal input from UART1 */
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/*****************************************************************************/
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EVENT_RESOURCE(resource_coap_rx_uart1, /* name */
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"obs;title=\"rx_uart1\"", /* attributes */
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get_coap_rx_uart1_handler, /* GET handler */
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NULL, /* POST handler */
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NULL, /* PUT handler */
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NULL, /* DELETE handler */
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event_coap_rx_uart1_handler); /* event handler */
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static void
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get_coap_rx_uart1_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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unsigned int accept = -1;
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REST.get_header_accept(request, &accept);
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if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
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content_len = 0;
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CONTENT_PRINTF("%s", rx_buf);
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REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
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REST.set_response_payload(response, (uint8_t *)content, content_len);
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}
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}
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static void
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event_coap_rx_uart1_handler(void)
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{
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/* Registered observers are notified and will trigger the GET handler to create the response. */
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REST.notify_subscribers(&resource_coap_rx_uart1);
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}
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/*****************************************************************************/
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/* GET/PUT resource to send data to terminal on UART1 */
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/*****************************************************************************/
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RESOURCE(resource_coap_tx_uart1, /* name */
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"obs;title=\"tx_uart1\"", /* attributes */
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NULL, /* GET handler */
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put_post_tx_uart1_handler, /* POST handler */
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put_post_tx_uart1_handler, /* PUT handler */
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NULL); /* DELETE handler */
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static void
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put_post_tx_uart1_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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const uint8_t *request_content = NULL;
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unsigned int accept = -1;
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REST.get_header_accept(request, &accept);
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if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
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REST.get_request_payload(request, &request_content);
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string2uart1((uint8_t *)request_content);
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}
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}
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/*********** End COAP resources *********************************************/
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(start_app, ev, data)
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{
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PROCESS_BEGIN();
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static int is_coordinator = 0;
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memset(rx_buf, '\0', sizeof(rx_buf));
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/* Define process that handles data */
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process_start(&rx_data_process ,NULL);
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/* Initialise UART1 */
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uart1_init(UART1_BAUD_RATE);
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/* Callback received byte */
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uart1_set_input(handleRxChar);
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/* Start network stack */
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if(is_coordinator) {
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uip_ipaddr_t prefix;
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uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
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rpl_tools_init(&prefix);
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} else {
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rpl_tools_init(NULL);
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}
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printf("Starting RPL node\n");
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rest_init_engine();
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rest_activate_resource(&resource_coap_rx_uart1, "UART1-RX");
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rest_activate_resource(&resource_coap_tx_uart1, "UART1-TX");
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(rx_data_process, ev, data)
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{
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PROCESS_BEGIN();
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/* Process is polled whenever data is available from uart isr */
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uint8_t c;
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while(1) {
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PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
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/* Read RX ringbuffer. ASCII chars Output when LF is seen.
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If overflowed, strings are skipped */
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do {
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if (get_ringbuf(&c) == -1) {
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break; /* No more rx char's in ringbuffer */
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} else {
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if (rx_buf_index == RX_BUFFER_SIZE) { /* Skip current content if buffer full */
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rx_buf_index = 0;
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}
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rx_buf[rx_buf_index++] = c;
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if ((c == '\n')||(c == '\r')) {
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rx_buf[rx_buf_index] = '\0';
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printf("RX on UART1: %s", rx_buf);
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/* Signal event to coap clients.
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Demo assumes data is consumed before new data comes in */
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event_coap_rx_uart1_handler();
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rx_buf_index = 0;
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}
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}
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} while (1);
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}
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PROCESS_END();
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}
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/*************************************************************************/
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/* Local test functions */
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/*************************************************************************/
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/* TX function for UART1 */
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static void
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string2uart1(uint8_t *c)
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{
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while (*c!= '\0') {
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uart1_writeb(*c);
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c++;
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}
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}
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/* handleRxChar runs on uart isr */
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static int
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handleRxChar(uint8_t c)
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{
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if (put_ringbuf(c) == -1) {
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printf("Ringbuf full. Skip char\n");
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} else {
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/* Send event to rx data handler */
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process_poll(&rx_data_process);
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}
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return 0;
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}
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/* Simple ringbuffer
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if tail==head, no data has been written yet on that position. So, empty buffer
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is also initial state */
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static int
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get_ringbuf(uint8_t *c)
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{
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int return_val = 0;
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uart1_disable_interrupts();
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if (head_index != ((tail_index + 1)&RINGBUF_MAX_INDEX)) {
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tail_index = ((tail_index + 1)& RINGBUF_MAX_INDEX);
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*c = ringbuf[tail_index];
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} else {
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return_val = -1;
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}
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uart1_enable_interrupts();
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return return_val;
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}
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static int
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put_ringbuf(uint8_t c)
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{
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int return_val = 0;
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uart1_disable_interrupts();
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if (head_index != tail_index) {
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ringbuf[head_index] = c;
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head_index = ((head_index+1)&RINGBUF_MAX_INDEX);
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} else {
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return_val = -1;
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}
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uart1_enable_interrupts();
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return return_val;
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}
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