![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Coordinator code
Dependencies: EthernetInterface WebSocketClient mbed-rtos mbed
Diff: Xbee.cpp
- Revision:
- 0:4cb87eb1f914
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Xbee.cpp Thu Feb 18 13:21:58 2016 +0000 @@ -0,0 +1,105 @@ +#include "Xbee.h" + +static bool frameStarted = false; +static char readBuffer[128]; +static int buffer = 0; + +// Fonction d'assignation du PAN ID +void setPanId(Serial* xbee, unsigned long long panId) +{ + // Construction de la trame + const int frameLength = 16; + char frame[frameLength]; + frame[0] = 0x7E; // Start delimiter + frame[1] = 0x00; // Length (MSB) + frame[2] = 0x0C; // Length (LSB) + frame[3] = 0x08; // AT Command + frame[4] = 0x00; // Frame ID + frame[5] = 'I'; + frame[6] = 'D'; + frame[7] = (panId >> 56) & 0xFF; + frame[8] = (panId >> 48) & 0xFF; + frame[9] = (panId >> 40) & 0xFF; + frame[10] = (panId >> 32) & 0xFF; + frame[11] = (panId >> 24) & 0xFF; + frame[12] = (panId >> 16) & 0xFF; + frame[13] = (panId >> 8) & 0xFF; + frame[14] = (panId >> 0) & 0xFF; + frame[15] = checksum(frame, 3, 15); + + // Envoi sur le UART + if (xbee->writeable()) + { + for (int i = 0; i < frameLength; i++) + { + xbee->putc(frame[i]); + } + } +} + +// Fonction de calcul du checksum +char checksum(char* frame, int begin, int end) +{ + char sum = 0; + + // Addition des bits + for (int i = begin; i < end; i++) + { + sum += frame[i]; + } + + return 0xFF - sum; +} + +// Fonction de lecture des données du Xbee +bool readPacket(Serial* pc, Serial* xbee, char* output) +{ + if(xbee->readable()) + { + int c = xbee->getc(); + + // Début d'une trame + if (c == START_BYTE) + { + frameStarted = true; + } + + // Ajout du caractère dans le buffer + if (frameStarted) + { + readBuffer[buffer++] = c; + } + + // Si la longueur de la trame a été lue + if (buffer > 3) + { + int length = (readBuffer[1] << 8 ) | (readBuffer[2] & 0xFF); + + // Vérifier que la trame au complet a été reçue et que le checksum est valide + if (buffer == length + 4 && + checksum(readBuffer, 3, buffer) == readBuffer[buffer]) + { + // Fin de la trame + frameStarted = false; + parse(readBuffer, buffer, output); + buffer = 0; + return true; + } + } + } + + return false; +} + +void parse(char* buffer, int size, char* output) +{ + if (size >= 17) + { + // Données utiles + int button = buffer[15]; + short accX = buffer[16] | buffer[17] << 8; + + // Formattage pour le serveur Websockets + sprintf(output, "Button = %i, Acceleration X = %i\r\n", button, accX); + } +}