multihop protocol
Dependencies: mbed
remote.cpp
- Committer:
- mfrede
- Date:
- 2015-11-10
- Revision:
- 3:1b37d57a4e41
- Parent:
- 2:9365aaf34637
- Child:
- 4:024e613151a5
File content as of revision 3:1b37d57a4e41:
#include "mbed.h" #include "MRF24J40.h" #include <string> #include "packet.h" //define a node number #define NODE 2 // RF tranceiver to link with gateway. MRF24J40 mrf(p11, p12, p13, p14, p21); // LEDs you can treat these as variables (led2 = 1 will turn led2 on!) DigitalOut led1(LED1); DigitalOut led2(LED2); DigitalOut led3(LED3); DigitalOut led4(LED4); // Timer Timer timer; // Serial port for showing RX data. Serial pc(USBTX, USBRX); // Used for sending and receiving char txBuffer[128]; char rxBuffer[128]; int rxLen; //***************** Do not change these methods (please) *****************// /** * Receive data from the MRF24J40. * * @param data A pointer to a char array to hold the data * @param maxLength The max amount of data to read. */ int rf_receive(char *data, uint8_t maxLength) { uint8_t len = mrf.Receive((uint8_t *)data, maxLength); uint8_t header[8]= {1, 8, 0, 0xA1, 0xB2, 0xC3, 0xD4, 0x00}; if(len > 10) { //Remove the header and footer of the message for(uint8_t i = 0; i < len-2; i++) { if(i<8) { //Make sure our header is valid first if(data[i] != header[i]) return 0; } else { data[i-8] = data[i]; } } //pc.printf("Received: %s length:%d\r\n", data, ((int)len)-10); } return ((int)len)-10; } /** * Send data to another MRF24J40. * * @param data The string to send * @param maxLength The length of the data to send. * If you are sending a null-terminated string you can pass strlen(data)+1 */ void rf_send(char *data, uint8_t len) { //We need to prepend the message with a valid ZigBee header uint8_t header[8]= {1, 8, 0, 0xA1, 0xB2, 0xC3, 0xD4, 0x00}; uint8_t *send_buf = (uint8_t *) malloc( sizeof(uint8_t) * (len+8) ); for(uint8_t i = 0; i < len+8; i++) { //prepend the 8-byte header send_buf[i] = (i<8) ? header[i] : data[i-8]; } //pc.printf("Sent: %s\r\n", send_buf+8); mrf.Send(send_buf, len+8); free(send_buf); } //***************** You can start coding here *****************// int main (void) { //Set the channel of the slave uint8_t channel = 15; mrf.SetChannel(channel); //Analog input AnalogIn light(p20); //Analog input from the light sensor AnalogIn temp(p19); //Analog input from the temp snesor //Variable to read values float val = 1; int begin = 0; int end = 0; int current = 0; //Start the timer timer.start(); while(true) { //Try to receive some data rxLen = rf_receive(rxBuffer, 128); if(rxLen > 0) { //Switch on the Led and start the timer printf("Received input\n"); led1 = 1; begin = timer.read_ms(); end = begin + 1000; strcpy(txBuffer, "n"); while(current < end) { current = timer.read_ms(); val = button.read(); //printf("val: %f\r\n",val); if(val < 0.1f ) { strcpy(txBuffer, "y"); ///send "y" if press break; } }//end of 1 sec while loop led1 = 0; //Switch of the Led rf_send(txBuffer, strlen(txBuffer) + 1); // send data pc.printf("Sent: %s\r\n", txBuffer); }//end of if loop }// end of while true }//end of main