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