bleHelper.cpp

00001 
00002 #include "bleHelper.h"
00003 
00004 BLEHelper::BLEHelper(BLEDevice* ble, UARTService* UuartServicePtr)
00005 {
00006     blePtr = ble;
00007     uartServicePtr = UuartServicePtr;
00008 }
00009 
00010 
00011 void BLEHelper::sendOverBLE(uint16_t cmd, uint8_t data[], uint16_t len, PacketStatus_e status)
00012 {
00013     if(len > 18) {
00014         // this is a problem since we can only send 20 bytes of payload and need 2 bytes for the command 
00015         // so total of 18 can be sent in a single BLE transaction.
00016     }
00017 
00018     uint8_t buf[len + 2];        // should set it to the max single packet size
00019     uint8_t offset = 0;
00020     uint16_t tmp = cmd | (uint16_t)status;
00021     memcpy(buf, &tmp, sizeof(uint16_t));       // command
00022     offset+=sizeof(uint16_t);
00023     memcpy(&buf[offset], &data[0], len);              // data
00024     offset+= len;
00025     blePtr->updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), buf, offset);
00026 }
00027 
00028 void BLEHelper::sendPacketOverBLE(uint16_t cmd, uint8_t data[], uint16_t len)
00029 {
00030     uint8_t nPackets = (len / 19) + 1;
00031     uint8_t remainingPackets = nPackets;
00032     uint16_t offset = 0;
00033     bool first = true;
00034     const uint8_t maxDataPayload = 18;   // max is 20 but we are sending a command of 2 bytes always
00035 
00036     do {
00037         if(nPackets == 1) {
00038             // first and only
00039             packetStatus = PS_FIRST_AND_ONLY;
00040             sendOverBLE(cmd, &data[offset], len, packetStatus);
00041             remainingPackets = 0;
00042         } else if(remainingPackets == 1) {
00043             // last one
00044             packetStatus = PS_LAST;
00045             sendOverBLE(cmd, &data[offset], len-offset, packetStatus);
00046             remainingPackets = 0;
00047         } else if(remainingPackets > 1 && first == true) {
00048             // first and more to come
00049             packetStatus = PS_FIRST_AND_NOT_LAST;
00050             sendOverBLE(cmd, &data[offset], maxDataPayload, packetStatus);
00051             offset += maxDataPayload;
00052             remainingPackets -= 1;
00053             first = false;
00054         } else if(remainingPackets > 1 && first == false) {
00055             // middle
00056             packetStatus = PS_MIDDLE;
00057             sendOverBLE(cmd, &data[offset], maxDataPayload, packetStatus);
00058             offset += maxDataPayload;
00059             remainingPackets -= 1;
00060         }
00061 
00062         wait_ms(50);        // 40ms delay seems to be a limit
00063     } while (remainingPackets > 0);
00064 }
00065