1 /* 2 * hci_h4_transport.c 3 * 4 * HCI Transport API implementation for basic H4 protocol 5 * 6 * Created by Matthias Ringwald on 4/29/09. 7 */ 8 #include <termios.h> /* POSIX terminal control definitions */ 9 #include <fcntl.h> /* File control definitions */ 10 #include <unistd.h> /* UNIX standard function definitions */ 11 #include <stdio.h> 12 13 #include "hci.h" 14 #include "hci_transport_h4.h" 15 #include "hci_dump.h" 16 17 typedef enum { 18 H4_W4_PACKET_TYPE, 19 H4_W4_EVENT_HEADER, 20 H4_W4_EVENT_PAYLOAD, 21 H4_W4_ACL_HEADER, 22 H4_W4_ACL_PAYLOAD 23 } H4_STATE; 24 25 static void dummy_handler(uint8_t *packet, int size); 26 static hci_uart_config_t *hci_uart_config; 27 28 static int fd; 29 static void (*event_packet_handler)(uint8_t *packet, int size) = dummy_handler; 30 static void (*acl_packet_handler) (uint8_t *packet, int size) = dummy_handler; 31 32 // packet reader state machine 33 static H4_STATE h4_state; 34 static int bytes_to_read; 35 static int read_pos; 36 // static uint8_t hci_event_buffer[255+2]; // maximal payload + 2 bytes header 37 static uint8_t hci_packet[400]; // bigger than largest packet 38 39 40 // prototypes 41 static int h4_open(void *transport_config){ 42 hci_uart_config = (hci_uart_config_t*) transport_config; 43 struct termios toptions; 44 fd = open(hci_uart_config->device_name, O_RDWR | O_NOCTTY | O_NDELAY); 45 if (fd == -1) { 46 perror("init_serialport: Unable to open port "); 47 perror(hci_uart_config->device_name); 48 return -1; 49 } 50 51 if (tcgetattr(fd, &toptions) < 0) { 52 perror("init_serialport: Couldn't get term attributes"); 53 return -1; 54 } 55 speed_t brate = hci_uart_config->baudrate; // let you override switch below if needed 56 switch(hci_uart_config->baudrate) { 57 case 57600: brate=B57600; break; 58 case 115200: brate=B115200; break; 59 #ifdef B230400 60 case 230400: brate=B230400; break; 61 #endif 62 #ifdef B460800 63 case 460800: brate=B460800; break; 64 #endif 65 #ifdef B921600 66 case 921600: brate=B921600; break; 67 #endif 68 } 69 cfsetispeed(&toptions, brate); 70 cfsetospeed(&toptions, brate); 71 72 // 8N1 73 toptions.c_cflag &= ~PARENB; 74 toptions.c_cflag &= ~CSTOPB; 75 toptions.c_cflag &= ~CSIZE; 76 toptions.c_cflag |= CS8; 77 78 if (hci_uart_config->flowcontrol) { 79 // with flow control 80 toptions.c_cflag |= CRTSCTS; 81 } else { 82 // no flow control 83 toptions.c_cflag &= ~CRTSCTS; 84 } 85 86 toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines 87 toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl 88 89 toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw 90 toptions.c_oflag &= ~OPOST; // make raw 91 92 // see: http://unixwiz.net/techtips/termios-vmin-vtime.html 93 toptions.c_cc[VMIN] = 1; 94 toptions.c_cc[VTIME] = 0; 95 96 if( tcsetattr(fd, TCSANOW, &toptions) < 0) { 97 perror("init_serialport: Couldn't set term attributes"); 98 return -1; 99 } 100 101 // init state machine 102 bytes_to_read = 1; 103 h4_state = H4_W4_PACKET_TYPE; 104 read_pos = 0; 105 106 return 0; 107 } 108 109 static int h4_close(){ 110 close(fd); 111 return 0; 112 } 113 114 static int h4_send_cmd_packet(uint8_t *packet, int size){ 115 printf("CMD: "); 116 hexdump(packet, size); 117 118 char *data = (char*) packet; 119 char packet_type = HCI_COMMAND_DATA_PACKET; 120 121 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 122 123 write(fd, &packet_type, 1); 124 while (size > 0) { 125 int bytes_written = write(fd, data, size); 126 if (bytes_written < 0) { 127 return bytes_written; 128 } 129 data += bytes_written; 130 size -= bytes_written; 131 } 132 return 0; 133 } 134 135 static int h4_send_acl_packet(uint8_t *packet, int size){ 136 printf("ACL> "); 137 hexdump(packet, size); 138 139 char *data = (char*) packet; 140 char packet_type = HCI_ACL_DATA_PACKET; 141 142 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 143 144 write(fd, &packet_type, 1); 145 while (size > 0) { 146 int bytes_written = write(fd, data, size); 147 if (bytes_written < 0) { 148 return bytes_written; 149 } 150 data += bytes_written; 151 size -= bytes_written; 152 } 153 return 0; 154 } 155 156 static void h4_register_event_packet_handler(void (*handler)(uint8_t *packet, int size)){ 157 event_packet_handler = handler; 158 } 159 160 static void h4_register_acl_packet_handler (void (*handler)(uint8_t *packet, int size)){ 161 acl_packet_handler = handler; 162 } 163 164 static int h4_get_fd() { 165 return fd; 166 } 167 168 static int h4_handle_data() { 169 // read up to bytes_to_read data in 170 int bytes_read = read(fd, &hci_packet[read_pos], bytes_to_read); 171 if (bytes_read < 0) { 172 return bytes_read; 173 } 174 // printf("Bytes read: %u\n", bytes_read); 175 bytes_to_read -= bytes_read; 176 read_pos += bytes_read; 177 if (bytes_to_read > 0) { 178 return 0; 179 } 180 181 // act 182 switch (h4_state) { 183 case H4_W4_PACKET_TYPE: 184 if (hci_packet[0] == HCI_EVENT_PACKET){ 185 read_pos = 0; 186 bytes_to_read = HCI_EVENT_PKT_HDR; 187 h4_state = H4_W4_EVENT_HEADER; 188 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 189 read_pos = 0; 190 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 191 h4_state = H4_W4_ACL_HEADER; 192 } else { 193 } 194 break; 195 case H4_W4_EVENT_HEADER: 196 bytes_to_read = hci_packet[1]; 197 h4_state = H4_W4_EVENT_PAYLOAD; 198 break; 199 case H4_W4_EVENT_PAYLOAD: 200 printf("EVT: "); 201 hexdump(hci_packet, read_pos); 202 203 hci_dump_packet( HCI_EVENT_PACKET, 1, hci_packet, read_pos); 204 205 event_packet_handler(hci_packet, read_pos); 206 h4_state = H4_W4_PACKET_TYPE; 207 read_pos = 0; 208 bytes_to_read = 1; 209 break; 210 case H4_W4_ACL_HEADER: 211 bytes_to_read = READ_BT_16( hci_packet, 2); 212 h4_state = H4_W4_ACL_PAYLOAD; 213 break; 214 case H4_W4_ACL_PAYLOAD: 215 printf("<ACL "); 216 hexdump(hci_packet, read_pos); 217 218 hci_dump_packet( HCI_ACL_DATA_PACKET, 1, hci_packet, read_pos); 219 220 acl_packet_handler(hci_packet, read_pos); 221 h4_state = H4_W4_PACKET_TYPE; 222 read_pos = 0; 223 bytes_to_read = 1; 224 break; 225 } 226 return 0; 227 } 228 229 static const char * h4_get_transport_name(){ 230 return "H4"; 231 } 232 233 static void dummy_handler(uint8_t *packet, int size){ 234 } 235 236 // single instance 237 hci_transport_t hci_transport_h4 = { 238 h4_open, 239 h4_close, 240 h4_send_cmd_packet, 241 h4_send_acl_packet, 242 h4_register_event_packet_handler, 243 h4_register_acl_packet_handler, 244 h4_get_fd, 245 h4_handle_data, 246 h4_get_transport_name 247 }; 248