Based on myBlueUSB and rosserial_mbed
Dependencies: mbed myUSBHost AvailableMemory myBlueUSB
rfcomm/RFCOMM.cpp
- Committer:
- OTL
- Date:
- 2011-09-17
- Revision:
- 1:18139954944b
- Parent:
- 0:7684b95768c7
File content as of revision 1:18139954944b:
#include "mbed.h" #include "Utils.h" #include "RFCOMM.h" // Control field values bit no. 1 2 3 4 5 6 7 8 #define BT_RFCOMM_SABM 0x3F // 1 1 1 1 P/F 1 0 0 #define BT_RFCOMM_UA 0x73 // 1 1 0 0 P/F 1 1 0 #define BT_RFCOMM_DM 0x0F // 1 1 1 1 P/F 0 0 0 #define BT_RFCOMM_DM_PF 0x1F #define BT_RFCOMM_DISC 0x53 // 1 1 0 0 P/F 0 1 0 #define BT_RFCOMM_UIH 0xEF // 1 1 1 1 P/F 1 1 1 #define BT_RFCOMM_UIH_PF 0xFF // Multiplexer message types #define BT_RFCOMM_PN_CMD 0x83 #define BT_RFCOMM_PN_RSP 0x81 #define BT_RFCOMM_TEST_CMD 0x23 #define BT_RFCOMM_TEST_RSP 0x21 #define BT_RFCOMM_FCON_CMD 0xA3 #define BT_RFCOMM_FCON_RSP 0xA1 #define BT_RFCOMM_FCOFF_CMD 0x63 #define BT_RFCOMM_FCOFF_RSP 0x61 #define BT_RFCOMM_MSC_CMD 0xE3 #define BT_RFCOMM_MSC_RSP 0xE1 #define BT_RFCOMM_RPN_CMD 0x93 #define BT_RFCOMM_RPN_RSP 0x91 #define BT_RFCOMM_RLS_CMD 0x53 #define BT_RFCOMM_RLS_RSP 0x51 #define BT_RFCOMM_NSC_RSP 0x11 // FCS calc #define BT_RFCOMM_CODE_WORD 0xE0 // pol = x8+x2+x1+1 #define BT_RFCOMM_CRC_CHECK_LEN 3 #define BT_RFCOMM_UIHCRC_CHECK_LEN 2 #define NR_CREDITS 1 #define INITIAL_CREDITS 1 //0...7 #define DCD (1<<7) //DV data carrier detect #define RI (1<<6) //IC ring indicator #define RTS (1<<3) //RTR request to send #define DSR (1<<2) //RTC data set ready #define FC (1<<1) //Flow Control #define EA (1<<0) //extended address (always 1) #define SIGNALS (DCD | RTS | DSR | EA) #define DEBUG 1 #define TAKE_INITIATIVE RFCOMMManager rfcomm_manager; //uint8_t rfcomm_out_buffer[1000];//seems a bit big as default max framesize is 127 //unsigned rfcomm::maxframesize = MAX_FRAME_SIZE; //only initial value //these functions are obtained from rfcomm.c on google code void _bt_rfcomm_send_sabm(unsigned short source_cid, unsigned char initiator, unsigned char channel); void _bt_rfcomm_send_uih_pn_command(unsigned short source_cid, unsigned char initiator, unsigned char channel, unsigned short max_frame_size); void _bt_rfcomm_send_uih_msc_cmd(unsigned short source_cid, unsigned char initiator, unsigned char channel, unsigned char signals); void _bt_rfcomm_send_uih_rpn_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, port_settings *val); int rfcomm_send_packet(unsigned short source_cid, unsigned char address, unsigned char control, unsigned char credits, const unsigned char *data, unsigned short len); uint8_t crc8_calc(uint8_t *data, uint16_t len); //find a free socket slot for channel ch int rfcomm::find_slot(unsigned ch) { for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) { if (sckts[i] != 0) { //socket is in use RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]); if (s==0) { printf("find_slot: socket %d not found\n", sckts[i]); continue; } if (s->dlci >> 1 == ch) { printf("Channel %d is already in use on socket %d\n", ch, sckts[i]); return -1; } } else //slot is free return i; } return -2; //no free slots } //find the rfcomm socket for dlci RFCOMMSocket* rfcomm::find_socket(unsigned dlci) { for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) { if (sckts[i] != 0) { //socket is in use RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]); if (s==0) { printf("find_socket: socket %d not found\n", sckts[i]); continue; } if (s->dlci == dlci) { return s; } } } printf("RFCOMMSocket for dlci %d was not found!\n", dlci); return 0; //socket not found } //send a PN command to all sockets waiting to be opened void rfcomm::initChannels(int socket) { for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) { if (sckts[i] != 0) { //socket is in use RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]); if (s==0) { printf("initChannels: socket %d not found\n", sckts[i]); continue; } if (s->State == SocketState_Opening) { printf("Sending PN for DLCI %d on socket %d\n", s->dlci, sckts[i]); _bt_rfcomm_send_uih_pn_command(socket, 1, s->dlci, maxframesize); s->State = SocketState_L2CAP_Config_wait; } } } } unsigned rfcomm::release_channel(unsigned dlci) { int n = 0; for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) { if (sckts[i] != 0) { //socket is in use RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]); if (s==0) { printf("Release: socket for dlci %d not found\n", dlci); continue; } if (s->dlci == dlci) sckts[i] = 0; else n++; } } return n; } int rfcomm::Send(SocketInternal *sock, const u8* data, int len) {//also see if credits need to be send RFCOMMSocket *s = (RFCOMMSocket*)sock; char credits = 0; char control = BT_RFCOMM_UIH; if (len + 14 > maxframesize) //hci/l2cap header =8, rfcomm header ~ 6 printf("Error! packetsize = %d, maxframesize = %d\n", len, maxframesize); if (s->peer_credits == 0) {//peer is low on credits credits = NR_CREDITS; control = BT_RFCOMM_UIH_PF; s->peer_credits += NR_CREDITS;//so provide some more } unsigned char address = (1 << 0) | (initiator << 1) | (s->dlci << 2); if (s->my_credits) { s->my_credits--; return rfcomm_send_packet(_l2cap, address, control, credits, data, len); } else return rfcomm_send_packet(_l2cap, address, control, credits, data, 0);//send an empty packet when credits run out } int rfcomm::Close(SocketInternal* sock) { RFCOMMSocket *s = (RFCOMMSocket*)sock; int id = s->dlci; printf("Closing rfcomm dlci %d state=%d\n", id, s->State); Disconnect(s); int n = release_channel(id); printf("%d channels are still open\n", n); if (n == 0) {//all rfcomm channels are closed printf("....L2CAP must be closed as well\n"); rfcomm_send_packet(_l2cap, (1 << 0) | (initiator << 1), BT_RFCOMM_DISC, 0, 0, 0); //close dlci0 Socket_Close(_l2cap); _l2cap = 0; //return rfcomm to the pool } return 0; } int rfcomm::SetOpt(SocketInternal *sock, int so, int* data, int len) { switch (so) { case SO_RECBUF: case SO_SNDBUF: maxframesize = *data; //pointless because setting takes effect only before socket is opened (before PN) break; default: return NOPROTOOPT; } return 0; } int rfcomm::GetOpt(SocketInternal *sock, int so, int* data, int len) { switch (so) { case SO_RECBUF: case SO_SNDBUF: if (len >= sizeof(int)) *data = maxframesize; break; default: return NOPROTOOPT; } return 0; } int rfcomm::Disconnect(RFCOMMSocket *s) { unsigned char address = (1 << 0) | (initiator << 1) | (s->dlci << 2); return rfcomm_send_packet(_l2cap, address, BT_RFCOMM_DISC, 0, 0, 0); } //expect this to be called with socket type=SOCKET_RFCOM and addr->psm = channel and addr->bdaddr is the BT addr //of the device to connect to. //eg. Socket_Open(SOCKET_RFCOM, rfcommaddr(bdaddr, chan), receiver_func, appl_obj); int rfcomm::Open(SocketInternal* sock, SocketAddrHdr* addr) { int ch = ((L2CAPAddr*)addr)->psm;//abused psm for channel ID RFCOMMSocket *s = (RFCOMMSocket*)sock; int slot = find_slot(ch); if (slot < 0) return 0; sckts[slot] = s->ID; s->serdevice = this; s->State = SocketState_Opening; if (_l2cap == 0) { //no rfcomm -> l2cap connection yet printf("Need to open L2CAP channel first before opening RFCOMM channel %d\n", s->dlci); ((L2CAPAddr*)addr)->psm = L2CAP_PSM_RFCOMM;//open the l2cap channel and the rfcomm_ch channel initiator = 1; s->dlci = (ch<<1)|!initiator; _l2cap = Socket_Open(SOCKET_L2CAP, addr, OnRfCommControl, this);//this is the socket between the RFCOMM and the L2CAP layer if (_l2cap) printf("Successfully opened L2CAP channel on socket %d\n", _l2cap); else { printf("Opening L2CAP channel failed\n"); sckts[slot] = 0; s->State = SocketState_Closed; return 0; } } else {//bypass the l2cap channel creation s->dlci = (ch<<1)|!initiator; _bt_rfcomm_send_uih_pn_command(_l2cap, initiator, s->dlci, maxframesize); s->State = SocketState_L2CAP_Config_wait; } return s->ID; //return the application unique socket nr. } int rfcomm::set_remote_port_parameters(unsigned char dlci, port_settings *p) { _bt_rfcomm_send_uih_rpn_cmd(_l2cap, initiator, dlci, p); return 0; } //socket is an L2CAP socket and state is the state of the L2CAP socket, not the RFCOMM socket void rfcomm::OnRfCommControl(int socket, SocketState state, const u8* data, int len, void* userData) { int packet_processed = 0; rfcomm* self = (rfcomm*)userData; const u8 initiator = self->initiator; printf("\x1B[%dm", 32); //debug: set a different colour printf("OnRfCommControl sock = %d, state = %d, length = %d\n", socket, state, len); if (len == 0) {//client only if (state==SocketState_Open) {//callback after change to 'open', the rfcomm->l2cap channel is now open _bt_rfcomm_send_sabm(socket, initiator, 0); //setup the rfcomm control channel dlci==0 return; } return; //or other states to handle, e.g. Closing or Closed } //we have data, so parse the header const u8 &addr = data[0]; u8 dlci = addr>>2; const u8 &control = data[1]; u16 length = data[2]>>1; const u8 *payload = data+3; const u8 *pFCS = data+len-1; //expected position of the CRC if (!(data[2]&1)) { //two byte length length += ((unsigned)data[3])<<7; payload++; } u8 credits = 0; if (control == BT_RFCOMM_UIH_PF)//this packet carries credits credits = *(payload++); //sanity check if (payload+length != pFCS) printf("RFCOMM size mismatch, expected %d payload bytes, got %d\n", length, pFCS-payload); if (DEBUG) { printf("RFCOMM: EA=%d, C/R=%d, D=%d, ch=%d; control=%02X (P/F=%d); length=%d\n", addr&1, (addr>>1)&1, (addr>>2)&1, (addr>>3), control, (control>>4)&1, length); printfBytes("payload:", payload, length); } if (dlci == 0) { //dlci==0 control channel L2CAPSocket *s = (L2CAPSocket*)GetSocketInternal(socket); switch (control) { case BT_RFCOMM_UA:// received 1. message BT_RF_COMM_UA packet_processed++; if (s->si.State == SocketState_Closing || s->si.State==SocketState_L2CAP_WaitDisconnect) { //Confirmation of disconnect printf("Remote side confirmed disconnect for socket %d\n", s->si.ID); s->si.SetState(SocketState_Closed); break; } printf("Received RFCOMM unnumbered acknowledgement for channel 0 - multiplexer working\n"); printf("Sending UIH Parameter Negotiation Command from OnRfCommControl\n"); self->initChannels(socket); break; case BT_RFCOMM_UIH:// received UIH Parameter Negotiation Response switch (payload[0]) { case BT_RFCOMM_PN_RSP: {//client packet_processed++; printf("UIH Parameter Negotiation Response\n"); printf("Sending SABM #%u\n", payload[2]); _bt_rfcomm_send_sabm(socket, initiator, payload[2]);//was rfcomm_ch RFCOMMSocket *r = self->find_socket(payload[2]); if (r==0) break; r->my_credits = payload[9]; //initial amount of credits self->maxframesize = min(self->maxframesize, payload[6] + (payload[7]<<8)); printf("Max Frame Size = %d, got %d initial credits\n", self->maxframesize, payload[9]); } break; case BT_RFCOMM_PN_CMD: { //remote side sent PN command, mtu and initial credits packet_processed++; printf("UIH Parameter Negotiation Indication\n"); self->maxframesize = min(self->maxframesize, payload[6] + (payload[7]<<8)); unsigned char cred = payload[9] & 7; unsigned char _dlci = payload[2]; int skt = rfcomm_manager.find_socket(_dlci>>1); if (skt == 0) { //No-one is listening printf("No-one is Listening on channel %d\n", _dlci>>1); rfcomm_send_packet(socket, (_dlci<<2)|1, BT_RFCOMM_DM, 0, 0, 0); break; } RFCOMMSocket *r = (RFCOMMSocket*)GetSocketInternal(skt); r->my_credits = cred; r->peer_credits = INITIAL_CREDITS; unsigned char reply[10]; memcpy(reply, payload, sizeof(reply)); reply[0] = BT_RFCOMM_PN_RSP;//[1]=len, [2]=dlci, [4]=priority, [5]=timer(must be 0), [8] retransmissions (must be 0) reply[3] = payload[3]==0xF0 ? 0xE0 : 0; //support credit based flow control reply[6] = self->maxframesize; reply[7] = self->maxframesize>>8; reply[9] = payload[3]==0xF0 ? r->peer_credits : 0; printf("Max Frame Size = %d, give %d initial credits\n", self->maxframesize, reply[9]); rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, sizeof(reply)); } break; case BT_RFCOMM_MSC_CMD: packet_processed++; { printf("Received BT_RFCOMM_MSC_IND\n"); // fine with this, return the same status and ignore the value, there is no room in the socket to store the value, rfcomm could generate an event RFCOMMSocket *r = self->find_socket(payload[2]>>2); if (r==0) break; unsigned char reply[5]; memcpy(reply, payload, 5); //keep length, dlci and value(s) reply[0] = BT_RFCOMM_MSC_RSP; // change command into response printf("Sending MSC_RSP (%d bytes)\n", length); rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, (payload[1]>>1)+2); // reply is 4 or 5 bytes switch (r->State) { case SocketState_L2CAP_Config_wait: r->State = SocketState_L2CAP_Config_wait_send; printf("Sending MSC_CMD\n"); _bt_rfcomm_send_uih_msc_cmd(socket, initiator, payload[2]>>2, SIGNALS); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1 r->State = SocketState_L2CAP_Config_wait_rsp; break; case SocketState_L2CAP_Config_wait_reqrsp: r->State = SocketState_L2CAP_Config_wait_rsp; break; case SocketState_L2CAP_Config_wait_req: r->SetState(SocketState_Open); break; case SocketState_Open: //inform port adaptation layer printf("Received MSC IND in state Open for dlci 0x%02x\n", payload[2]>>2); break; default: printf("Received MSC IND in state %d for dlci 0x%02x\n", r->State, payload[2]>>2); } } break; case BT_RFCOMM_MSC_RSP: packet_processed++; { RFCOMMSocket *r = self->find_socket(payload[2]>>2); if (r==0) break; if (r->State == SocketState_L2CAP_Config_wait_reqrsp) r->State = SocketState_L2CAP_Config_wait_req; else if (r->State == SocketState_L2CAP_Config_wait_rsp) r->SetState(SocketState_Open); else printf("Received MSC confirmation in state %d for dlci 0x%02x\n", r->State, payload[2]>>2); } break; case BT_RFCOMM_RPN_CMD: packet_processed++; //accept and ignore all settings unsigned char reply[10]; memcpy(reply, payload, length); //keep length, dlci and value(s) reply[0] = BT_RFCOMM_RPN_RSP; // change command into response printf("Responding to RPN indication (%d bytes)\n", length); rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, length); break; case BT_RFCOMM_RPN_RSP: packet_processed++; //ignore a response printf("Received RPN confirmation\n"); break; default: printf("Unsupported multiplexer frame, type=%02XH\n", data[3]); } break; case BT_RFCOMM_DISC: printf("Remote site actively disconnected from DLCI0\n"); rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm disconnection //intentional fall through case BT_RFCOMM_DM: packet_processed++; printf("Remote side refused connection on DLCI0\n"); self->_l2cap = Socket_Close(socket); break; case BT_RFCOMM_SABM: packet_processed++; printf("Remote site is seeking connection on DLCI0\n"); //respond with UA rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm connection break; default: printf("Unexpected RFCOMM cmd %02XH for address %02XH, length=%d\n", control, addr, length); } } else { //data is for one of the serial sockets RFCOMMSocket *s = 0; if (control == BT_RFCOMM_SABM) { //req. for conn on this dlci //cannot call self->rfcomm::find_socket because it has no socket yet int skt = rfcomm_manager.find_socket(dlci>>1); //find the server socket s = (RFCOMMSocket*)GetSocketInternal(skt);//the listening socket if (s) {//move the listening socket to the appropriate rfcomm int slot = self->find_slot(dlci>>1); if (slot < 0) { printf("RFCOMM Channel %d is not free on rfcomm with l2cap socket %d\n", dlci>>1, self->_l2cap); return; } s->serdevice = self; //bind the socket to this refcomm entity self->sckts[slot] = skt; rfcomm_manager.remove_socket(skt); } else { printf("Couln't find a listening socket for dlci %d\n", dlci); return; } } else s = self->find_socket(dlci); if (s==0){ printf("DLCI %d not found\n", dlci); return; } switch (control) { case BT_RFCOMM_SABM: packet_processed++; rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm connection s->State = SocketState_L2CAP_Config_wait; //wait for msc cmd #ifdef TAKE_INITIATIVE printf("Sending MSC_CMD\n"); _bt_rfcomm_send_uih_msc_cmd(socket, initiator, dlci, 0x8d); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1 s->State = SocketState_L2CAP_Config_wait_reqrsp; #endif break; case BT_RFCOMM_UA:// received 2. message BT_RF_COMM_UA packet_processed++; if (s->State == SocketState_Closing) { //Confirmation of disconnect printf("Remote side confirmed disconnect for socket %d\n", s->ID); s->SetState(SocketState_Closed); break; } printf("Received RFCOMM unnumbered acknowledgement for dlci %u - channel opened\n", dlci); if (s->State == SocketState_L2CAP_Config_wait) { printf("Sending MSC CMD\n"); _bt_rfcomm_send_uih_msc_cmd(socket, initiator, dlci, 0x8d); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1 s->State = SocketState_L2CAP_Config_wait_reqrsp; } break; case BT_RFCOMM_UIH_PF: //user data with credits printf("Got %u credits\n", credits); s->my_credits += credits; //intentional fall-through case BT_RFCOMM_UIH: //user data packet_processed++; if (DEBUG) { printf("RX: address %02x, control %02x: ", addr, control); printHex( payload, length); } if (length) { s->peer_credits--; s->Recv(payload, length); } else printf("Received empty packet\n"); if (length == 0 || s->peer_credits == 0) {//send credits when peer runs out //char ini = !(dlci & 1); unsigned char address = (1 << 0) | (initiator << 1) | (dlci << 2); printf("send %d credits to dlci %d\n", NR_CREDITS, addr>>2); rfcomm_send_packet(socket, address, BT_RFCOMM_UIH_PF, NR_CREDITS, NULL, 0); s->peer_credits += NR_CREDITS; } break; case BT_RFCOMM_DISC: packet_processed++; printf("Received DISC IND for dlci %d\n", dlci); rfcomm_send_packet(socket, addr, BT_RFCOMM_UA, 0, 0, 0);//confirm disconnection s->SetState(SocketState_Closed); break; case BT_RFCOMM_DM: case BT_RFCOMM_DM_PF: packet_processed++; printf("Received DM IND (%02X) for dlci %d\n", control, dlci); s->SetState(SocketState_Closed); break; default: printf("Unexpected RFCOMM cmd %02XH for address %02XH, length=%d\n", control, addr, length); } } if (!packet_processed) { // just dump data for now printf("??: address %02x, control %02x: ", data[0], data[1]); printHex( data, len ); } printf("\x1B[%dm", 0);//reset terminal colour } //should make the functions below member functions /** * @param credits - only used for RFCOMM flow control in UIH wiht P/F = 1 */ /* Questionable optimisation. When OFFSET==8 a buffer is (dynamically) allocated that provides space for the lower layer headers, this reduces copying to, and allocation of, a lower layer buffer. However, all other layers using HCI/L2CAP must do the same. */ #define OFFSET 8 int rfcomm_send_packet(uint16_t source_cid, uint8_t address, uint8_t control, uint8_t credits, const uint8_t *data, uint16_t len) { uint16_t pos = OFFSET; uint8_t crc_fields = 3; #if OFFSET == 8 uint8_t* rfcomm_out_buffer = new uint8_t[OFFSET+len+6]; #else static uint8_t rfcomm_out_buffer[MAXFRAMESIZE+6];//seems a bit big as default max framesize is 127 #endif rfcomm_out_buffer[pos++] = address; rfcomm_out_buffer[pos++] = control; // length field can be 1 or 2 octets if (len < 128) { rfcomm_out_buffer[pos++] = (len << 1)| 1; // bits 0-6 } else { rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6 rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14 crc_fields++; } // add credits for UIH frames when PF bit is set if (control == BT_RFCOMM_UIH_PF) { rfcomm_out_buffer[pos++] = credits; } // copy actual data memcpy(&rfcomm_out_buffer[pos], data, len); pos += len; // UIH frames only calc FCS over address + control (5.1.1) if ((control & 0xef) == BT_RFCOMM_UIH) { crc_fields = 2; } rfcomm_out_buffer[pos++] = crc8_calc(rfcomm_out_buffer+OFFSET, crc_fields); // calc fcs int retval = Socket_Send( source_cid, rfcomm_out_buffer, pos); #if OFFSET == 8 delete[] rfcomm_out_buffer; #endif if (retval <= 0) return retval; return len;//return the size of the payload } void _bt_rfcomm_send_sabm(uint16_t source_cid, uint8_t initiator, uint8_t dlci) { uint8_t address = (1 << 0) | (initiator << 1) | (dlci << 2); rfcomm_send_packet(source_cid, address, BT_RFCOMM_SABM, 0, NULL, 0); } void _bt_rfcomm_send_uih_pn_command(uint16_t source_cid, uint8_t initiator, uint8_t dlci, uint16_t max_frame_size) { uint8_t payload[10]; uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0 uint8_t pos = 0; payload[pos++] = BT_RFCOMM_PN_CMD; payload[pos++] = 8 << 1 | 1; // len payload[pos++] = dlci; payload[pos++] = 0xf0; // pre defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM payload[pos++] = 0; // priority payload[pos++] = 0; // max 60 seconds ack payload[pos++] = max_frame_size & 0xff; // max framesize low payload[pos++] = max_frame_size >> 8; // max framesize high payload[pos++] = 0x00; // number of retransmissions payload[pos++] = INITIAL_CREDITS; // unused error recovery window rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); } void _bt_rfcomm_send_uih_data(uint16_t source_cid, uint8_t initiator, uint8_t channel, uint8_t *data, uint16_t len) { uint8_t address = (1 << 0) | (initiator << 1) | (!initiator << 2) | (channel << 3); rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, data, len); } void _bt_rfcomm_send_uih_msc_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, uint8_t signals) { uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0 uint8_t payload[5]; uint8_t pos = 0; payload[pos++] = BT_RFCOMM_MSC_CMD; payload[pos++] = 2 << 1 | 1; // len, should be adapted when adding break byte payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); //C/R is always 1 payload[pos++] = signals; // payload[pos++] = brk; rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); } void _bt_rfcomm_send_uih_rpn_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, port_settings *val) { uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0 uint8_t payload[sizeof(port_settings)+3]; uint8_t pos = 0; payload[pos++] = BT_RFCOMM_RPN_CMD;//type if (val) { payload[pos++] = ((1+sizeof(port_settings)) << 1) | 1; // len payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); memcpy(payload+pos, (char*)val, sizeof(port_settings)); pos += sizeof(port_settings); } else { payload[pos++] = (1 << 1) | 1; // len payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); } rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos); } int set_remote_port_parameters(int socket, port_settings *p) { RFCOMMSocket* si = (RFCOMMSocket*)GetSocketInternal(socket);//gets the RFCOMM socket if (!si || si->ID != socket) return ERR_SOCKET_NOT_FOUND; return si->serdevice->set_remote_port_parameters(si->dlci, p); } /* * CRC (reversed crc) lookup table as calculated by the table generator in ETSI TS 101 369 V6.3.0. */ static const uint8_t crc8table[256] = { /* reversed, 8-bit, poly=0x07 */ 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B, 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67, 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43, 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F, 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B, 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17, 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33, 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F, 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B, 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87, 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3, 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF, 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB, 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7, 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3, 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF }; #define CRC8_INIT 0xFF // Initial FCS value #define CRC8_OK 0xCF // Good final FCS value /*-----------------------------------------------------------------------------------*/ uint8_t crc8(uint8_t *data, uint16_t len) { uint16_t count; uint8_t crc = CRC8_INIT; for (count = 0; count < len; count++) crc = crc8table[crc ^ data[count]]; return crc; } /*-----------------------------------------------------------------------------------*/ uint8_t crc8_check(uint8_t *data, uint16_t len, uint8_t check_sum) { uint8_t crc; crc = crc8(data, len); crc = crc8table[crc ^ check_sum]; if (crc == CRC8_OK) return 0; /* Valid */ else return 1; /* Failed */ } /*-----------------------------------------------------------------------------------*/ uint8_t crc8_calc(uint8_t *data, uint16_t len) { /* Ones complement */ return 0xFF - crc8(data, len); }