涂 桂旺 / Mbed OS mbed-os-example-cj

json test

main.cpp@0:2ee762ea11b3, 2018-01-26 (annotated)

Committer:
tgw
Date:
Fri Jan 26 06:05:31 2018 +0000
Revision:
0:2ee762ea11b3
json

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tgw 0:2ee762ea11b3 1 #include "mbed.h"
tgw 0:2ee762ea11b3 2
tgw 0:2ee762ea11b3 3 #include <json/config.h>
tgw 0:2ee762ea11b3 4 #include <json/value.h>
tgw 0:2ee762ea11b3 5 #include <json/writer.h>
tgw 0:2ee762ea11b3 6 #include <json/config.h>
tgw 0:2ee762ea11b3 7 #include <json/json.h>
tgw 0:2ee762ea11b3 8 #include <cstring>
tgw 0:2ee762ea11b3 9 #include <limits>
tgw 0:2ee762ea11b3 10 #include <sstream>
tgw 0:2ee762ea11b3 11 #include <string>
tgw 0:2ee762ea11b3 12 #include <iomanip>
tgw 0:2ee762ea11b3 13 #include <stdio.h>
tgw 0:2ee762ea11b3 14 #include <deque>
tgw 0:2ee762ea11b3 15
tgw 0:2ee762ea11b3 16 DigitalOut led1(LED1);
tgw 0:2ee762ea11b3 17 Serial pc(USBTX, USBRX);
tgw 0:2ee762ea11b3 18
tgw 0:2ee762ea11b3 19 bool running;
tgw 0:2ee762ea11b3 20 Thread thread;
tgw 0:2ee762ea11b3 21
tgw 0:2ee762ea11b3 22 // Blink function toggles the led in a long running loop
tgw 0:2ee762ea11b3 23 void blink(DigitalOut *led) {
tgw 0:2ee762ea11b3 24 while (running) {
tgw 0:2ee762ea11b3 25 *led = !*led;
tgw 0:2ee762ea11b3 26 wait(1);
tgw 0:2ee762ea11b3 27 }
tgw 0:2ee762ea11b3 28 }
tgw 0:2ee762ea11b3 29
tgw 0:2ee762ea11b3 30 void callback_ex() {
tgw 0:2ee762ea11b3 31 // Note: you need to actually read from the serial to clear the RX interrupt
tgw 0:2ee762ea11b3 32 int tmp=pc.getc();
tgw 0:2ee762ea11b3 33 //printf("%c\n", tmp);
tgw 0:2ee762ea11b3 34 }
tgw 0:2ee762ea11b3 35
tgw 0:2ee762ea11b3 36 // Spawns a thread to run blink for 5 seconds
tgw 0:2ee762ea11b3 37 // main() runs in its own thread in the OS
tgw 0:2ee762ea11b3 38 int main() {
tgw 0:2ee762ea11b3 39
tgw 0:2ee762ea11b3 40
tgw 0:2ee762ea11b3 41 pc.baud(9600);
tgw 0:2ee762ea11b3 42 pc.attach(&callback_ex);
tgw 0:2ee762ea11b3 43
tgw 0:2ee762ea11b3 44 thread.start(callback(blink, &led1));
tgw 0:2ee762ea11b3 45
tgw 0:2ee762ea11b3 46 running = true;
tgw 0:2ee762ea11b3 47
tgw 0:2ee762ea11b3 48
tgw 0:2ee762ea11b3 49 //thread_gsensor.start(callback(gsensorThread));
tgw 0:2ee762ea11b3 50 //wait(1);
tgw 0:2ee762ea11b3 51 //thread_motor.start(callback(motorThread));
tgw 0:2ee762ea11b3 52 //wait(1);
tgw 0:2ee762ea11b3 53 //thread_sonar.start(callback(sonarThread));
tgw 0:2ee762ea11b3 54
tgw 0:2ee762ea11b3 55 //Thread thread_sonar(sonarThread);
tgw 0:2ee762ea11b3 56
tgw 0:2ee762ea11b3 57 Json::Reader reader;
tgw 0:2ee762ea11b3 58
tgw 0:2ee762ea11b3 59 Json::Value json_object;
tgw 0:2ee762ea11b3 60
tgw 0:2ee762ea11b3 61 const char* json_document = "{\"age\" : 26,\"name\" : \"huchao\"}";
tgw 0:2ee762ea11b3 62
tgw 0:2ee762ea11b3 63 if (!reader.parse(json_document, json_object))return 0;
tgw 0:2ee762ea11b3 64
tgw 0:2ee762ea11b3 65 printf("name : %s\n",json_object["name"]);
tgw 0:2ee762ea11b3 66
tgw 0:2ee762ea11b3 67 printf("name : %s\n",json_object["age"]);
tgw 0:2ee762ea11b3 68 }
tgw 0:2ee762ea11b3 69
tgw 0:2ee762ea11b3 70
tgw 0:2ee762ea11b3 71 /*
tgw 0:2ee762ea11b3 72 主程序指定中断函数
tgw 0:2ee762ea11b3 73 flipper.attach(&flip, 2.0); // the address of the function to be attached (flip) and the interval (2 seconds)
tgw 0:2ee762ea11b3 74
tgw 0:2ee762ea11b3 75 主程序指定 类 的 方法
tgw 0:2ee762ea11b3 76 t.attach(callback(&f, &Flipper::flip), 2.0); // the address of the object, member function, and interval
tgw 0:2ee762ea11b3 77
tgw 0:2ee762ea11b3 78
tgw 0:2ee762ea11b3 79 1、线程
tgw 0:2ee762ea11b3 80 需加载mbed-os
tgw 0:2ee762ea11b3 81
tgw 0:2ee762ea11b3 82 #include "mbed.h"
tgw 0:2ee762ea11b3 83
tgw 0:2ee762ea11b3 84 Thread thread;
tgw 0:2ee762ea11b3 85 DigitalOut led1(LED1);
tgw 0:2ee762ea11b3 86 volatile bool running = true;
tgw 0:2ee762ea11b3 87
tgw 0:2ee762ea11b3 88 // Blink function toggles the led in a long running loop
tgw 0:2ee762ea11b3 89 void blink(DigitalOut *led) {
tgw 0:2ee762ea11b3 90 while (running) {
tgw 0:2ee762ea11b3 91 *led = !*led;
tgw 0:2ee762ea11b3 92 wait(1);
tgw 0:2ee762ea11b3 93 }
tgw 0:2ee762ea11b3 94 }
tgw 0:2ee762ea11b3 95
tgw 0:2ee762ea11b3 96 // Spawns a thread to run blink for 5 seconds
tgw 0:2ee762ea11b3 97 int main() {
tgw 0:2ee762ea11b3 98 thread.start(callback(blink, &led1));
tgw 0:2ee762ea11b3 99 wait(5);
tgw 0:2ee762ea11b3 100 running = false;
tgw 0:2ee762ea11b3 101 thread.join();
tgw 0:2ee762ea11b3 102 }
tgw 0:2ee762ea11b3 103
tgw 0:2ee762ea11b3 104
tgw 0:2ee762ea11b3 105 2、休眠+按键中断唤醒
tgw 0:2ee762ea11b3 106 需更新mbed
tgw 0:2ee762ea11b3 107 使用F401板时，IDD电流测试，运行时:18mA，灯亮时21 .2mA，睡眠时：6.26 mA，深度睡眠时：0.68 mA，
tgw 0:2ee762ea11b3 108
tgw 0:2ee762ea11b3 109 RTC唤醒使用第三方类（未测试）
tgw 0:2ee762ea11b3 110
tgw 0:2ee762ea11b3 111 #include "mbed.h"
tgw 0:2ee762ea11b3 112
tgw 0:2ee762ea11b3 113 InterruptIn event(USER_BUTTON);
tgw 0:2ee762ea11b3 114 DigitalOut myled(LED1);
tgw 0:2ee762ea11b3 115
tgw 0:2ee762ea11b3 116 int go_to_sleep = 0;
tgw 0:2ee762ea11b3 117
tgw 0:2ee762ea11b3 118 void pressed()
tgw 0:2ee762ea11b3 119 {
tgw 0:2ee762ea11b3 120 printf("Button pressed\n");
tgw 0:2ee762ea11b3 121 go_to_sleep = go_to_sleep + 1;
tgw 0:2ee762ea11b3 122 if (go_to_sleep > 3) go_to_sleep = 0;
tgw 0:2ee762ea11b3 123
tgw 0:2ee762ea11b3 124 }
tgw 0:2ee762ea11b3 125
tgw 0:2ee762ea11b3 126 int main()
tgw 0:2ee762ea11b3 127 {
tgw 0:2ee762ea11b3 128 int i = 0;
tgw 0:2ee762ea11b3 129
tgw 0:2ee762ea11b3 130 printf("\nPress Button to enter/exit sleep & deepsleep\n");
tgw 0:2ee762ea11b3 131
tgw 0:2ee762ea11b3 132 event.fall(&pressed);
tgw 0:2ee762ea11b3 133
tgw 0:2ee762ea11b3 134 while (1) {
tgw 0:2ee762ea11b3 135
tgw 0:2ee762ea11b3 136 if ((go_to_sleep == 0) || (go_to_sleep == 2)) {
tgw 0:2ee762ea11b3 137 printf("%d: Running\n", i);
tgw 0:2ee762ea11b3 138 myled = !myled;
tgw 0:2ee762ea11b3 139 wait(1.0);
tgw 0:2ee762ea11b3 140 }
tgw 0:2ee762ea11b3 141
tgw 0:2ee762ea11b3 142 if (go_to_sleep == 1) {
tgw 0:2ee762ea11b3 143 myled = 0;
tgw 0:2ee762ea11b3 144 printf("%d: Entering sleep (press user button to resume)\n", i);
tgw 0:2ee762ea11b3 145 sleep();
tgw 0:2ee762ea11b3 146 }
tgw 0:2ee762ea11b3 147
tgw 0:2ee762ea11b3 148 if (go_to_sleep == 3) {
tgw 0:2ee762ea11b3 149 myled = 0;
tgw 0:2ee762ea11b3 150 printf("%d: Entering deepsleep (press user button to resume)\n", i);
tgw 0:2ee762ea11b3 151 deepsleep();
tgw 0:2ee762ea11b3 152 }
tgw 0:2ee762ea11b3 153
tgw 0:2ee762ea11b3 154 i++;
tgw 0:2ee762ea11b3 155 }
tgw 0:2ee762ea11b3 156 }
tgw 0:2ee762ea11b3 157
tgw 0:2ee762ea11b3 158
tgw 0:2ee762ea11b3 159 3、系统定时器中断
tgw 0:2ee762ea11b3 160 #include "mbed.h"
tgw 0:2ee762ea11b3 161
tgw 0:2ee762ea11b3 162 Ticker toggle_led_ticker;
tgw 0:2ee762ea11b3 163
tgw 0:2ee762ea11b3 164 DigitalOut led1(LED1);
tgw 0:2ee762ea11b3 165
tgw 0:2ee762ea11b3 166 void toggle_led() {
tgw 0:2ee762ea11b3 167 led1 = !led1;
tgw 0:2ee762ea11b3 168 }
tgw 0:2ee762ea11b3 169
tgw 0:2ee762ea11b3 170 int main() {
tgw 0:2ee762ea11b3 171 // Init the ticker with the address of the function (toggle_led) to be attached and the interval (100 ms)
tgw 0:2ee762ea11b3 172 toggle_led_ticker.attach(&toggle_led, 0.1);
tgw 0:2ee762ea11b3 173 while (true) {
tgw 0:2ee762ea11b3 174 // Do other things...
tgw 0:2ee762ea11b3 175 }
tgw 0:2ee762ea11b3 176 }
tgw 0:2ee762ea11b3 177
tgw 0:2ee762ea11b3 178 4、超时定时器中断
tgw 0:2ee762ea11b3 179 #include "mbed.h"
tgw 0:2ee762ea11b3 180
tgw 0:2ee762ea11b3 181 // A class for flip()-ing a DigitalOut
tgw 0:2ee762ea11b3 182 class Flipper {
tgw 0:2ee762ea11b3 183 public:
tgw 0:2ee762ea11b3 184 Flipper(PinName pin) : _pin(pin) {
tgw 0:2ee762ea11b3 185 _pin = 0;
tgw 0:2ee762ea11b3 186 }
tgw 0:2ee762ea11b3 187 void flip() {
tgw 0:2ee762ea11b3 188 _pin = !_pin;
tgw 0:2ee762ea11b3 189 }
tgw 0:2ee762ea11b3 190 private:
tgw 0:2ee762ea11b3 191 DigitalOut _pin;
tgw 0:2ee762ea11b3 192 };
tgw 0:2ee762ea11b3 193
tgw 0:2ee762ea11b3 194 DigitalOut led1(LED1);
tgw 0:2ee762ea11b3 195 Flipper f(LED2);
tgw 0:2ee762ea11b3 196 Timeout t;
tgw 0:2ee762ea11b3 197
tgw 0:2ee762ea11b3 198 int main() {
tgw 0:2ee762ea11b3 199 // the address of the object, member function, and interval
tgw 0:2ee762ea11b3 200 t.attach(callback(&f, &Flipper::flip), 2.0);
tgw 0:2ee762ea11b3 201
tgw 0:2ee762ea11b3 202 // spin in a main loop. flipper will interrupt it to call flip
tgw 0:2ee762ea11b3 203 while(1) {
tgw 0:2ee762ea11b3 204 led1 = !led1;
tgw 0:2ee762ea11b3 205 wait(0.2);
tgw 0:2ee762ea11b3 206 }
tgw 0:2ee762ea11b3 207 }
tgw 0:2ee762ea11b3 208
tgw 0:2ee762ea11b3 209
tgw 0:2ee762ea11b3 210 5、通用定时器中断
tgw 0:2ee762ea11b3 211
tgw 0:2ee762ea11b3 212 // Count the time to toggle a LED
tgw 0:2ee762ea11b3 213
tgw 0:2ee762ea11b3 214 #include "mbed.h"
tgw 0:2ee762ea11b3 215
tgw 0:2ee762ea11b3 216 Timer timer;
tgw 0:2ee762ea11b3 217 DigitalOut led(LED1);
tgw 0:2ee762ea11b3 218 int begin, end;
tgw 0:2ee762ea11b3 219
tgw 0:2ee762ea11b3 220 int main() {
tgw 0:2ee762ea11b3 221 timer.start();
tgw 0:2ee762ea11b3 222 begin = timer.read_us();
tgw 0:2ee762ea11b3 223 led = !led;
tgw 0:2ee762ea11b3 224 end = timer.read_us();
tgw 0:2ee762ea11b3 225 printf("Toggle the led takes %d us", end - begin);
tgw 0:2ee762ea11b3 226 }
tgw 0:2ee762ea11b3 227
tgw 0:2ee762ea11b3 228 6、外部中断附加事件
tgw 0:2ee762ea11b3 229 需加载mbed-os
tgw 0:2ee762ea11b3 230
tgw 0:2ee762ea11b3 231 #include "mbed.h"
tgw 0:2ee762ea11b3 232 #include "mbed_events.h"
tgw 0:2ee762ea11b3 233
tgw 0:2ee762ea11b3 234 DigitalOut led1(LED1);
tgw 0:2ee762ea11b3 235 InterruptIn sw(SW2);
tgw 0:2ee762ea11b3 236 EventQueue queue(32 * EVENTS_EVENT_SIZE);
tgw 0:2ee762ea11b3 237 Thread t;
tgw 0:2ee762ea11b3 238
tgw 0:2ee762ea11b3 239 void rise_handler(void) {
tgw 0:2ee762ea11b3 240 // Toggle LED
tgw 0:2ee762ea11b3 241 led1 = !led1;
tgw 0:2ee762ea11b3 242 }
tgw 0:2ee762ea11b3 243
tgw 0:2ee762ea11b3 244 void fall_handler(void) {
tgw 0:2ee762ea11b3 245 printf("fall_handler in context %p\r\n", Thread::gettid());
tgw 0:2ee762ea11b3 246 // Toggle LED
tgw 0:2ee762ea11b3 247 led1 = !led1;
tgw 0:2ee762ea11b3 248 }
tgw 0:2ee762ea11b3 249
tgw 0:2ee762ea11b3 250 int main() {
tgw 0:2ee762ea11b3 251 // Start the event queue
tgw 0:2ee762ea11b3 252 t.start(callback(&queue, &EventQueue::dispatch_forever));
tgw 0:2ee762ea11b3 253 printf("Starting in context %p\r\n", Thread::gettid());
tgw 0:2ee762ea11b3 254 // The 'rise' handler will execute in IRQ context
tgw 0:2ee762ea11b3 255 sw.rise(rise_handler);
tgw 0:2ee762ea11b3 256 // The 'fall' handler will execute in the context of thread 't'
tgw 0:2ee762ea11b3 257 sw.fall(queue.event(fall_handler));
tgw 0:2ee762ea11b3 258 }
tgw 0:2ee762ea11b3 259
tgw 0:2ee762ea11b3 260
tgw 0:2ee762ea11b3 261 7、线程间信号量的传递
tgw 0:2ee762ea11b3 262 需加载mbed-os
tgw 0:2ee762ea11b3 263
tgw 0:2ee762ea11b3 264 #include "mbed.h"
tgw 0:2ee762ea11b3 265
tgw 0:2ee762ea11b3 266 Thread thread;
tgw 0:2ee762ea11b3 267 DigitalOut led(LED1);
tgw 0:2ee762ea11b3 268
tgw 0:2ee762ea11b3 269 void led_thread() {
tgw 0:2ee762ea11b3 270 while (true) {
tgw 0:2ee762ea11b3 271 // Signal flags that are reported as event are automatically cleared.
tgw 0:2ee762ea11b3 272 Thread::signal_wait(0x1);
tgw 0:2ee762ea11b3 273 led = !led;
tgw 0:2ee762ea11b3 274 }
tgw 0:2ee762ea11b3 275 }
tgw 0:2ee762ea11b3 276
tgw 0:2ee762ea11b3 277 int main (void) {
tgw 0:2ee762ea11b3 278 thread.start(callback(led_thread));
tgw 0:2ee762ea11b3 279
tgw 0:2ee762ea11b3 280 while (true) {
tgw 0:2ee762ea11b3 281 wait(1);
tgw 0:2ee762ea11b3 282 thread.signal_set(0x1);
tgw 0:2ee762ea11b3 283 }
tgw 0:2ee762ea11b3 284 }
tgw 0:2ee762ea11b3 285
tgw 0:2ee762ea11b3 286 */