1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "led_counter.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(led_counter): Hello World - Blinking an LED without Bluetooth 42 * 43 * @text The example demonstrates how to provide a periodic timer to toggle an 44 * LED and send debug messages to the console as a minimal BTstack test. 45 */ 46 // ***************************************************************************** 47 48 49 50 #include <stdint.h> 51 #include <stdio.h> 52 53 #include "btstack_run_loop.h" 54 #include "btstack_defines.h" 55 #include "hal_led.h" 56 57 #define HEARTBEAT_PERIOD_MS 1000 58 59 static int counter = 0; 60 static btstack_timer_source_t heartbeat; 61 62 /* @section Periodic Timer Setup 63 * 64 * @text As timers in BTstack are single shot, 65 * the periodic counter is implemented by re-registering the timer source in the 66 * heartbeat handler callback function. Listing LEDToggler shows heartbeat handler 67 * adapted to periodically toggle an LED and print number of toggles. 68 */ 69 70 /* LISTING_START(LEDToggler): Periodic counter */ 71 static void heartbeat_handler(btstack_timer_source_t *ts){ 72 UNUSED(ts); 73 74 // increment counter 75 char lineBuffer[30]; 76 snprintf(lineBuffer, sizeof(lineBuffer), "BTstack counter %04u\n\r", ++counter); 77 puts(lineBuffer); 78 79 // toggle LED 80 hal_led_toggle(); 81 82 // re-register timer 83 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 84 btstack_run_loop_add_timer(&heartbeat); 85 } 86 /* LISTING_END */ 87 88 /* @section Main Application Setup 89 * 90 * @text Listing MainConfiguration shows main application code. 91 * It configures the heartbeat tier and adds it to the run loop. 92 */ 93 94 /* LISTING_START(MainConfiguration): Setup heartbeat timer */ 95 int btstack_main(int argc, const char * argv[]); 96 int btstack_main(int argc, const char * argv[]){ 97 (void)argc; 98 (void)argv; 99 100 // set one-shot timer 101 heartbeat.process = &heartbeat_handler; 102 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 103 btstack_run_loop_add_timer(&heartbeat); 104 105 printf("Running...\n\r"); 106 return 0; 107 } 108 /* LISTING_END */ 109 /* EXAMPLE_END */ 110