Merge pull request #1643 from akshaypm/zoul-uart-example

Zoul UART example

examples/cc2538-common/Makefile

@@ -1,5 +1,5 @@
 DEFINES+=PROJECT_CONF_H=\"project-conf.h\"
-CONTIKI_PROJECT = test-pwm timer-test
+CONTIKI_PROJECT = test-pwm timer-test test-uart
 
 all: $(CONTIKI_PROJECT)
 

examples/cc2538-common/test-uart.c

@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2016, Indian Institute of Science <http://www.iisc.ernet.in>
+ * 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.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ */
+/**
+ * \addtogroup cc2538-examples
+ * @{
+ *
+ * \defgroup cc2538-test-uart Test the CC2538 UART
+ *
+ * Demonstrates the use of the CC2538 UART
+ *
+ * @{
+ *
+ * \file
+ *         A quick program for testing the UART1 on the cc2538 based
+ * platform which can be used to interface with sensor with UART
+ * interface and to communicate with other development boards
+ * \author
+ *         Akshay P M <akshaypm@ece.iisc.ernet.in>
+ */
+/*---------------------------------------------------------------------------*/
+#include "contiki.h"
+#include "sys/etimer.h"
+#include "dev/leds.h"
+#include "dev/uart.h"
+#include "dev/serial-line.h"
+#include <stdio.h>
+#include <stdint.h>
+/*---------------------------------------------------------------------------*/
+static struct etimer et;
+/*---------------------------------------------------------------------------*/
+PROCESS(cc2538_uart_demo_process, "cc2538 uart demo");
+AUTOSTART_PROCESSES(&cc2538_uart_demo_process);
+/*---------------------------------------------------------------------------*/
+unsigned int
+uart1_send_bytes(const unsigned char *s, unsigned int len)
+{
+  unsigned int i = 0;
+
+  while(s && *s != 0) {
+    if(i >= len) {
+      break;
+    }
+    uart_write_byte(1, *s++);
+    i++;
+  }
+  return i;
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(cc2538_uart_demo_process, ev, data)
+{
+  char *rxdata;
+  static uint16_t count=0;
+  char string[20];
+  
+  PROCESS_BEGIN();
+  uart_set_input(1, serial_line_input_byte);
+  etimer_set(&et, CLOCK_SECOND * 4);
+  leds_toggle(LEDS_GREEN);
+
+  while(1) {
+    PROCESS_WAIT_UNTIL(etimer_expired(&et));
+    sprintf(string, "sending string %u.\n", ++count);
+    uart1_send_bytes((uint8_t *)string, sizeof(string) - 1);
+    etimer_reset(&et);
+    printf("string is being sent\n");
+
+    PROCESS_YIELD();
+    if(ev == serial_line_event_message) {
+      leds_toggle(LEDS_RED);
+      rxdata = data;
+      printf("Data received over UART %s\n", rxdata);
+    }
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * @}
+ * @}
+ */