Mark Radbourne / Mbed 2 deprecated FXOS8700CQ_To_Azure_IoT

Simple sample that demonstrates reading the FXOS8700CQ accelerometer, convert the data to JSON and send to an Azure IoT Hub.

Dependencies:   azure_umqtt_c iothub_mqtt_transport mbed-rtos mbed wolfSSL Socket lwip-eth lwip-sys lwip

main.cpp@3:c0556ff7b8e3, 2016-12-08 (annotated)

Committer:
markrad
Date:
Thu Dec 08 00:11:40 2016 +0000
Revision:
3:c0556ff7b8e3
Parent:
2:2b9acda15ef0
Child:
4:9b3da9969b1b
Hack the code to get restart working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
markrad 0:6c46c366f500 1 // Copyright (c) Microsoft. All rights reserved.
markrad 0:6c46c366f500 2 // Licensed under the MIT license. See LICENSE file at https://github.com/Azure/azure-iot-sdks/blob/master/LICENSE for full license information.
markrad 0:6c46c366f500 3
markrad 0:6c46c366f500 4 /* -------------------------------------------------------------------------- *\
markrad 0:6c46c366f500 5
markrad 0:6c46c366f500 6 Simple progam to demonstrate reading the FRDM-K64F FXOS8700CQ
markrad 0:6c46c366f500 7 accelerometer, convert the data to JSON and send to an Azure IoT Hub. You
markrad 0:6c46c366f500 8 must provide your hub's connection string in the variable
markrad 0:6c46c366f500 9 'connectionString'.
markrad 0:6c46c366f500 10
markrad 0:6c46c366f500 11 markrad
markrad 0:6c46c366f500 12
markrad 0:6c46c366f500 13 \* -------------------------------------------------------------------------- */
markrad 0:6c46c366f500 14
markrad 0:6c46c366f500 15 #include <string.h>
markrad 0:6c46c366f500 16
markrad 0:6c46c366f500 17 #include "SingletonFXOS8700CQ.h"
markrad 0:6c46c366f500 18
markrad 0:6c46c366f500 19 #include "iothub_client.h"
markrad 0:6c46c366f500 20 #include "iothub_message.h"
markrad 0:6c46c366f500 21 #include "azure_c_shared_utility/threadapi.h"
markrad 0:6c46c366f500 22 #include "azure_c_shared_utility/crt_abstractions.h"
markrad 0:6c46c366f500 23 #include "azure_c_shared_utility/platform.h"
markrad 0:6c46c366f500 24 #include "iothubtransportmqtt.h"
markrad 2:2b9acda15ef0 25 #include "lock.h"
markrad 0:6c46c366f500 26
markrad 0:6c46c366f500 27 #include "certs.h"
markrad 0:6c46c366f500 28
markrad 0:6c46c366f500 29 int readingToJSON(char *buffer, int bufferlen, READING &reading)
markrad 0:6c46c366f500 30 {
markrad 0:6c46c366f500 31 static const char READING[] = "\"reading\"";
markrad 0:6c46c366f500 32 static const char ACCELEROMETER[] = "\"accelerometer\"";
markrad 0:6c46c366f500 33 static const char MAGNOMETER[] = "\"magnometer\"";
markrad 0:6c46c366f500 34 static const char X[] = "\"X\"";
markrad 0:6c46c366f500 35 static const char Y[] = "\"Y\"";
markrad 0:6c46c366f500 36 static const char Z[] = "\"Z\"";
markrad 0:6c46c366f500 37 static const char STARTOBJ[] = " : {\n";
markrad 0:6c46c366f500 38 static const char ENDOBJ[] = "}\n";
markrad 0:6c46c366f500 39 static const char PREPEND[] = "{\n";
markrad 0:6c46c366f500 40 static const int MINBUFFERLEN =
markrad 0:6c46c366f500 41 sizeof(READING) +
markrad 0:6c46c366f500 42 sizeof(ACCELEROMETER) +
markrad 0:6c46c366f500 43 sizeof(MAGNOMETER) +
markrad 0:6c46c366f500 44 2 * (sizeof(X) + sizeof(Y) + sizeof(Z)) +
markrad 0:6c46c366f500 45 3 * sizeof(STARTOBJ) +
markrad 0:6c46c366f500 46 4 * sizeof(ENDOBJ) +
markrad 0:6c46c366f500 47 sizeof(PREPEND) +
markrad 0:6c46c366f500 48 6 * 9;
markrad 0:6c46c366f500 49 static const char numConvert[] = "%d";
markrad 0:6c46c366f500 50
markrad 0:6c46c366f500 51 char toNum[10];
markrad 0:6c46c366f500 52 char work[MINBUFFERLEN + 1];
markrad 0:6c46c366f500 53
markrad 0:6c46c366f500 54 if (buffer == NULL)
markrad 0:6c46c366f500 55 return 0;
markrad 0:6c46c366f500 56
markrad 0:6c46c366f500 57 buffer[0] = '\0';
markrad 0:6c46c366f500 58
markrad 0:6c46c366f500 59 strcpy(work, PREPEND);
markrad 0:6c46c366f500 60 strcat(work, READING);
markrad 0:6c46c366f500 61 strcat(work, STARTOBJ);
markrad 0:6c46c366f500 62 strcat(work, ACCELEROMETER);
markrad 0:6c46c366f500 63 strcat(work, STARTOBJ);
markrad 0:6c46c366f500 64 strcat(work, X);
markrad 0:6c46c366f500 65 strcat(work, " : ");
markrad 0:6c46c366f500 66 sprintf(toNum, numConvert, reading.accelerometer.x);
markrad 0:6c46c366f500 67 strcat(work, toNum);
markrad 0:6c46c366f500 68 strcat(work, ",\n");
markrad 0:6c46c366f500 69 strcat(work, Y);
markrad 0:6c46c366f500 70 strcat(work, " : ");
markrad 0:6c46c366f500 71 sprintf(toNum, numConvert, reading.accelerometer.y);
markrad 0:6c46c366f500 72 strcat(work, toNum);
markrad 0:6c46c366f500 73 strcat(work, ",\n");
markrad 0:6c46c366f500 74 strcat(work, Z);
markrad 0:6c46c366f500 75 strcat(work, " : ");
markrad 0:6c46c366f500 76 sprintf(toNum, numConvert, reading.accelerometer.z);
markrad 0:6c46c366f500 77 strcat(work, toNum);
markrad 0:6c46c366f500 78 strcat(work, "\n");
markrad 0:6c46c366f500 79 strcat(work, ENDOBJ);
markrad 0:6c46c366f500 80 strcat(work, MAGNOMETER);
markrad 0:6c46c366f500 81 strcat(work, STARTOBJ);
markrad 0:6c46c366f500 82 strcat(work, X);
markrad 0:6c46c366f500 83 strcat(work, " : ");
markrad 0:6c46c366f500 84 sprintf(toNum, numConvert, reading.magnometer.x);
markrad 0:6c46c366f500 85 strcat(work, toNum);
markrad 0:6c46c366f500 86 strcat(work, ",\n");
markrad 0:6c46c366f500 87 strcat(work, Y);
markrad 0:6c46c366f500 88 strcat(work, " : ");
markrad 0:6c46c366f500 89 sprintf(toNum, numConvert, reading.magnometer.y);
markrad 0:6c46c366f500 90 strcat(work, toNum);
markrad 0:6c46c366f500 91 strcat(work, ",\n");
markrad 0:6c46c366f500 92 strcat(work, Z);
markrad 0:6c46c366f500 93 strcat(work, " : ");
markrad 0:6c46c366f500 94 sprintf(toNum, numConvert, reading.magnometer.z);
markrad 0:6c46c366f500 95 strcat(work, toNum);
markrad 0:6c46c366f500 96 strcat(work, "\n");
markrad 0:6c46c366f500 97 strcat(work, ENDOBJ);
markrad 0:6c46c366f500 98 strcat(work, ENDOBJ);
markrad 0:6c46c366f500 99 strcat(work, ENDOBJ);
markrad 0:6c46c366f500 100
markrad 0:6c46c366f500 101 if (strlen(work) + 1 < bufferlen)
markrad 0:6c46c366f500 102 strcpy(buffer, work);
markrad 0:6c46c366f500 103
markrad 0:6c46c366f500 104 return strlen(work);
markrad 0:6c46c366f500 105 }
markrad 0:6c46c366f500 106
markrad 2:2b9acda15ef0 107 static LOCK_HANDLE msgLock;
markrad 2:2b9acda15ef0 108 static int msgCount = 0;
markrad 3:c0556ff7b8e3 109 static Timer t;
markrad 3:c0556ff7b8e3 110 static int CONNECTIONTIMEOUT = (20 * 1000);
markrad 2:2b9acda15ef0 111
markrad 0:6c46c366f500 112 static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback)
markrad 0:6c46c366f500 113 {
markrad 0:6c46c366f500 114 int* counter = (int*)userContextCallback;
markrad 0:6c46c366f500 115 const char* buffer;
markrad 0:6c46c366f500 116 size_t size;
markrad 0:6c46c366f500 117
markrad 0:6c46c366f500 118 if (IoTHubMessage_GetByteArray(message, (const unsigned char**)&buffer, &size) != IOTHUB_MESSAGE_OK)
markrad 0:6c46c366f500 119 {
markrad 0:6c46c366f500 120 (void)printf("unable to retrieve the message data\r\n");
markrad 0:6c46c366f500 121 }
markrad 0:6c46c366f500 122 else
markrad 0:6c46c366f500 123 {
markrad 0:6c46c366f500 124 (void)printf("Received Message [%d] with Data: <<<%.*s>>> & Size=%d\r\n", *counter, (int)size, buffer, (int)size);
markrad 0:6c46c366f500 125 }
markrad 0:6c46c366f500 126
markrad 0:6c46c366f500 127 // Some device specific action code goes here...
markrad 0:6c46c366f500 128 (*counter)++;
markrad 0:6c46c366f500 129
markrad 0:6c46c366f500 130 return IOTHUBMESSAGE_ACCEPTED;
markrad 0:6c46c366f500 131 }
markrad 0:6c46c366f500 132
markrad 0:6c46c366f500 133 static void SendConfirmationCallback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void* userContextCallback)
markrad 0:6c46c366f500 134 {
markrad 2:2b9acda15ef0 135 int* messageTrackingId = (int*)userContextCallback;
markrad 0:6c46c366f500 136
markrad 0:6c46c366f500 137 (void)printf("Confirmation received for message tracking id = %d with result = %s\r\n",
markrad 2:2b9acda15ef0 138 *messageTrackingId, ENUM_TO_STRING(IOTHUB_CLIENT_CONFIRMATION_RESULT, result));
markrad 0:6c46c366f500 139
markrad 2:2b9acda15ef0 140 free(userContextCallback);
markrad 2:2b9acda15ef0 141 Lock(msgLock);
markrad 2:2b9acda15ef0 142 msgCount--;
markrad 3:c0556ff7b8e3 143
markrad 3:c0556ff7b8e3 144 if (result == IOTHUB_CLIENT_CONFIRMATION_OK)
markrad 3:c0556ff7b8e3 145 {
markrad 3:c0556ff7b8e3 146 t.stop();
markrad 3:c0556ff7b8e3 147 t.reset();
markrad 3:c0556ff7b8e3 148 }
markrad 3:c0556ff7b8e3 149
markrad 2:2b9acda15ef0 150 Unlock(msgLock);
markrad 2:2b9acda15ef0 151
markrad 0:6c46c366f500 152 }
markrad 0:6c46c366f500 153
markrad 0:6c46c366f500 154 void stall(Serial &pc, char *message)
markrad 0:6c46c366f500 155 {
markrad 0:6c46c366f500 156 printf(message);
markrad 0:6c46c366f500 157 printf("stalled ");
markrad 0:6c46c366f500 158
markrad 0:6c46c366f500 159 while(true) {
markrad 0:6c46c366f500 160 pc.putc('.'); // idle dots
markrad 0:6c46c366f500 161 wait(1.0);
markrad 0:6c46c366f500 162 }
markrad 0:6c46c366f500 163 }
markrad 0:6c46c366f500 164
markrad 3:c0556ff7b8e3 165 IOTHUB_CLIENT_HANDLE setupConnection(Serial &pc, const char *connectionString, IOTHUB_CLIENT_TRANSPORT_PROVIDER protocol, void *receiveContext)
markrad 3:c0556ff7b8e3 166 {
markrad 3:c0556ff7b8e3 167 IOTHUB_CLIENT_HANDLE iotHubClientHandle = NULL;
markrad 3:c0556ff7b8e3 168
markrad 3:c0556ff7b8e3 169 printf("Calling platform_init\r\n");
markrad 3:c0556ff7b8e3 170
markrad 3:c0556ff7b8e3 171 while (platform_init())
markrad 3:c0556ff7b8e3 172 {
markrad 3:c0556ff7b8e3 173 pc.putc('P');
markrad 3:c0556ff7b8e3 174 wait(1.0);
markrad 3:c0556ff7b8e3 175 platform_deinit();
markrad 3:c0556ff7b8e3 176 }
markrad 3:c0556ff7b8e3 177
markrad 3:c0556ff7b8e3 178 // if (platform_init() != 0)
markrad 3:c0556ff7b8e3 179 // stall(pc, "Failed to initialize platform\n");
markrad 3:c0556ff7b8e3 180
markrad 3:c0556ff7b8e3 181 printf("Calling IoTHubClient_CreateFromConnectionString\r\n");
markrad 3:c0556ff7b8e3 182 if ((iotHubClientHandle = IoTHubClient_CreateFromConnectionString(connectionString, protocol)) == NULL)
markrad 3:c0556ff7b8e3 183 stall(pc, "ERROR: Could not create iotHubClientHandle\n");
markrad 3:c0556ff7b8e3 184
markrad 3:c0556ff7b8e3 185 bool traceOn = false;
markrad 3:c0556ff7b8e3 186 //bool traceOn = true;
markrad 3:c0556ff7b8e3 187
markrad 3:c0556ff7b8e3 188 printf("Calling IoTHubClient_SetOption logtrace with %d\r\n", traceOn);
markrad 3:c0556ff7b8e3 189 IoTHubClient_SetOption(iotHubClientHandle, "logtrace", &traceOn);
markrad 3:c0556ff7b8e3 190
markrad 3:c0556ff7b8e3 191 // For mbed add the certificate information
markrad 3:c0556ff7b8e3 192 printf("Calling IoTHubClient_SetOption TrustedCerts\r\n");
markrad 3:c0556ff7b8e3 193
markrad 3:c0556ff7b8e3 194 if (IoTHubClient_SetOption(iotHubClientHandle, "TrustedCerts", certificates) != IOTHUB_CLIENT_OK)
markrad 3:c0556ff7b8e3 195 stall(pc, "ERROR: failure to set option \"TrustedCerts\"\n");
markrad 3:c0556ff7b8e3 196
markrad 3:c0556ff7b8e3 197 printf("Calling IoTHubClient_SetMessageCallback\r\n");
markrad 3:c0556ff7b8e3 198
markrad 3:c0556ff7b8e3 199 if (IoTHubClient_SetMessageCallback(iotHubClientHandle, ReceiveMessageCallback, receiveContext) != IOTHUB_CLIENT_OK)
markrad 3:c0556ff7b8e3 200 stall(pc, "ERROR: IoTHubClient_SetMessageCallback failed\r\n");
markrad 3:c0556ff7b8e3 201
markrad 3:c0556ff7b8e3 202 return iotHubClientHandle;
markrad 3:c0556ff7b8e3 203 }
markrad 3:c0556ff7b8e3 204
markrad 3:c0556ff7b8e3 205 void terminateConnection(Serial &pc, IOTHUB_CLIENT_HANDLE iotHubClientHandle)
markrad 3:c0556ff7b8e3 206 {
markrad 3:c0556ff7b8e3 207 printf("Calling IoTHubClient_Destroy\r\n");
markrad 3:c0556ff7b8e3 208 IoTHubClient_Destroy(iotHubClientHandle);
markrad 3:c0556ff7b8e3 209 printf("Calling platform_deinit\r\n");
markrad 3:c0556ff7b8e3 210 platform_deinit();
markrad 3:c0556ff7b8e3 211 printf("Connection terminated\r\n");
markrad 3:c0556ff7b8e3 212 }
markrad 3:c0556ff7b8e3 213
markrad 3:c0556ff7b8e3 214
markrad 0:6c46c366f500 215 int main()
markrad 0:6c46c366f500 216 {
markrad 2:2b9acda15ef0 217 const char *connectionString = "HostName=MarkRadML.azure-devices.net;DeviceId=MBEDTest;SharedAccessKey=rgxlnR0rIBW4vnnnDkrbAv+mSOc/Mt60mg1CEjLx7pY=";
markrad 0:6c46c366f500 218
markrad 0:6c46c366f500 219 READING reading;
markrad 0:6c46c366f500 220 Serial pc(USBTX, USBRX); // Primary output to demonstrate library
markrad 0:6c46c366f500 221 SingletonFXOS8700CQ &sfxos = SingletonFXOS8700CQ::getInstance();
markrad 0:6c46c366f500 222 IOTHUB_CLIENT_HANDLE iotHubClientHandle;
markrad 0:6c46c366f500 223 int receiveContext = 0;
markrad 0:6c46c366f500 224 int transmitCounter = 0;
markrad 2:2b9acda15ef0 225
markrad 0:6c46c366f500 226 pc.baud(115200); // Print quickly! 200Hz x line of output data!
markrad 0:6c46c366f500 227
markrad 0:6c46c366f500 228 printf("\n\nFXOS8700CQ identity = %X\n", sfxos.getWhoAmI());
markrad 0:6c46c366f500 229
markrad 2:2b9acda15ef0 230 msgLock = Lock_Init(); // TODO: Check error code
markrad 2:2b9acda15ef0 231
markrad 0:6c46c366f500 232 sfxos.enable();
markrad 0:6c46c366f500 233 sfxos.getData(reading);
markrad 0:6c46c366f500 234
markrad 0:6c46c366f500 235 int rc;
markrad 0:6c46c366f500 236
markrad 1:0366fad6e60c 237 int LOOPCOUNT = -1; // Set to -1 to run forever
markrad 0:6c46c366f500 238
markrad 2:2b9acda15ef0 239 int localMsgCount;
markrad 2:2b9acda15ef0 240 int *userContext;
markrad 2:2b9acda15ef0 241 IOTHUB_MESSAGE_HANDLE msgHandle;
markrad 3:c0556ff7b8e3 242 int elapsedTime = 0;
markrad 2:2b9acda15ef0 243
markrad 0:6c46c366f500 244 char buffer[200];
markrad 0:6c46c366f500 245
markrad 3:c0556ff7b8e3 246 iotHubClientHandle = setupConnection(pc, connectionString, MQTT_Protocol, &receiveContext);
markrad 3:c0556ff7b8e3 247
markrad 0:6c46c366f500 248 while (LOOPCOUNT)
markrad 0:6c46c366f500 249 {
markrad 0:6c46c366f500 250 if (sfxos.getInt2Triggered())
markrad 0:6c46c366f500 251 {
markrad 0:6c46c366f500 252 sfxos.setInt2Triggered(false);
markrad 0:6c46c366f500 253 sfxos.getData(reading);
markrad 0:6c46c366f500 254 rc = readingToJSON(buffer, sizeof(buffer), reading);
markrad 0:6c46c366f500 255
markrad 0:6c46c366f500 256 if (rc > sizeof(buffer))
markrad 0:6c46c366f500 257 printf("ERROR: JSON buffer too small - require %d characters\n", rc);
markrad 0:6c46c366f500 258
markrad 2:2b9acda15ef0 259 Lock(msgLock);
markrad 2:2b9acda15ef0 260 localMsgCount = msgCount;
markrad 2:2b9acda15ef0 261 Unlock(msgLock);
markrad 0:6c46c366f500 262
markrad 2:2b9acda15ef0 263 if (localMsgCount < 2)
markrad 0:6c46c366f500 264 {
markrad 2:2b9acda15ef0 265 if ((msgHandle = IoTHubMessage_CreateFromByteArray((const unsigned char*)buffer, rc)) == NULL)
markrad 0:6c46c366f500 266 {
markrad 0:6c46c366f500 267 (void)printf("ERROR: iotHubMessageHandle is NULL!\r\n");
markrad 0:6c46c366f500 268 }
markrad 0:6c46c366f500 269 else
markrad 0:6c46c366f500 270 {
markrad 2:2b9acda15ef0 271 userContext = (int *) malloc(sizeof(userContext));
markrad 2:2b9acda15ef0 272
markrad 2:2b9acda15ef0 273 if (userContext != NULL)
markrad 0:6c46c366f500 274 {
markrad 2:2b9acda15ef0 275 *userContext = transmitCounter;
markrad 2:2b9acda15ef0 276
markrad 2:2b9acda15ef0 277 if (IoTHubClient_SendEventAsync(iotHubClientHandle, msgHandle, SendConfirmationCallback, userContext) != IOTHUB_CLIENT_OK)
markrad 2:2b9acda15ef0 278 {
markrad 2:2b9acda15ef0 279 (void)printf("ERROR: IoTHubClient_LL_SendEventAsync..........FAILED!\r\n");
markrad 2:2b9acda15ef0 280 }
markrad 2:2b9acda15ef0 281 else
markrad 2:2b9acda15ef0 282 {
markrad 2:2b9acda15ef0 283 (void)printf("IoTHubClient_LL_SendEventAsync accepted message [%d] for transmission to IoT Hub.\r\n", (int)transmitCounter);
markrad 2:2b9acda15ef0 284 }
markrad 2:2b9acda15ef0 285
markrad 2:2b9acda15ef0 286 IoTHubMessage_Destroy(msgHandle);
markrad 2:2b9acda15ef0 287 Lock(msgLock);
markrad 2:2b9acda15ef0 288 msgCount++;
markrad 3:c0556ff7b8e3 289 t.start();
markrad 2:2b9acda15ef0 290 Unlock(msgLock);
markrad 2:2b9acda15ef0 291
markrad 2:2b9acda15ef0 292 transmitCounter++;
markrad 0:6c46c366f500 293 }
markrad 0:6c46c366f500 294 else
markrad 0:6c46c366f500 295 {
markrad 2:2b9acda15ef0 296 (void)printf("ERROR: malloc - unable to allocate user context\r\n");
markrad 0:6c46c366f500 297 }
markrad 0:6c46c366f500 298 }
markrad 0:6c46c366f500 299 }
markrad 2:2b9acda15ef0 300 else
markrad 2:2b9acda15ef0 301 {
markrad 2:2b9acda15ef0 302 (void)printf("Message dropped queue length %d\r\n", localMsgCount);
markrad 2:2b9acda15ef0 303 }
markrad 0:6c46c366f500 304
markrad 3:c0556ff7b8e3 305 Lock(msgLock);
markrad 3:c0556ff7b8e3 306 elapsedTime = t.read_ms();
markrad 3:c0556ff7b8e3 307 Unlock(msgLock);
markrad 3:c0556ff7b8e3 308
markrad 3:c0556ff7b8e3 309 if (elapsedTime > CONNECTIONTIMEOUT)
markrad 3:c0556ff7b8e3 310 {
markrad 3:c0556ff7b8e3 311 printf("No response for %d milliseconds - attempt reconnection\r\n", elapsedTime);
markrad 3:c0556ff7b8e3 312 NVIC_SystemReset(); // Just blow it all away
markrad 3:c0556ff7b8e3 313 terminateConnection(pc, iotHubClientHandle);
markrad 3:c0556ff7b8e3 314 iotHubClientHandle = setupConnection(pc, connectionString, MQTT_Protocol, &receiveContext);
markrad 3:c0556ff7b8e3 315 printf("Reconnection complete\r\n");
markrad 3:c0556ff7b8e3 316 }
markrad 3:c0556ff7b8e3 317
markrad 3:c0556ff7b8e3 318 if (LOOPCOUNT > 0)
markrad 3:c0556ff7b8e3 319 LOOPCOUNT--;
markrad 0:6c46c366f500 320 }
markrad 0:6c46c366f500 321
markrad 0:6c46c366f500 322 wait_ms(500);
markrad 0:6c46c366f500 323 }
markrad 0:6c46c366f500 324
markrad 0:6c46c366f500 325 printf("Loop complete - clean up\n");
markrad 0:6c46c366f500 326
markrad 3:c0556ff7b8e3 327 terminateConnection(pc, iotHubClientHandle);
markrad 2:2b9acda15ef0 328 Lock_Deinit(msgLock);
markrad 2:2b9acda15ef0 329
markrad 0:6c46c366f500 330 printf("Test complete\n");
markrad 0:6c46c366f500 331
markrad 0:6c46c366f500 332
markrad 0:6c46c366f500 333 while(true) {
markrad 0:6c46c366f500 334 pc.putc('.'); // idle dots
markrad 0:6c46c366f500 335 wait(1.0);
markrad 0:6c46c366f500 336 }
markrad 0:6c46c366f500 337 }