diff -r 3b40e2100d96 -r 8340a591acf3 drivers/can_lincan/can_lincan.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/drivers/can_lincan/can_lincan.c Tue May 30 23:13:59 2006 +0200 @@ -0,0 +1,176 @@ +/* +This file is part of CanFestival, a library implementing CanOpen Stack. + +Copyright (C): Edouard TISSERANT and Francis DUPIN + +See COPYING file for copyrights details. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU Lesser General Public +License as published by the Free Software Foundation; either +version 2.1 of the License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Lesser General Public License for more details. + +You should have received a copy of the GNU Lesser General Public +License along with this library; if not, write to the Free Software +Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include +#include +#include +#include +#include /* for NULL */ +#include +#include +#include +#include +#include + +#include "canmsg.h" +#include "lincan.h" + +struct CANPort; +#define CAN_HANDLE struct CANPort * + +#include + +#include "timer.h" +#include "can_driver.h" +#include "timers_driver.h" + +typedef struct CANPort { + char used; + HANDLE fd; + TASK_HANDLE receiveTask; + CO_Data* d; +} CANPort; + +/*********functions which permit to communicate with the board****************/ +UNS8 canReceive(CAN_HANDLE fd0, Message *m) +{ + int res; + struct canmsg_t canmsg; + + canmsg.flags = 0; /* Ensure standard receive, not required for LinCAN>=0.3.1 */ + + do{ + res = read(fd0->fd,&canmsg,sizeof(canmsg_t)); + if((res<0)&&(errno == -EAGAIN)) res = 0; + }while(res==0); + + if(res != sizeof(canmsg_t)) // No new message + return 1; + + if(canmsg.flags&MSG_EXT){ + /* There is no mark for extended messages in CanFestival */; + } + + m->cob_id.w = canmsg.id; + m->len = canmsg.length; + if(canmsg.flags&MSG_RTR){ + m->rtr = 1; + }else{ + m->rtr = 0; + memcpy(m->data,canmsg.data,8); + } + + return 0; +} + +void canReceiveLoop(CAN_HANDLE fd0) +{ + CO_Data* d = fd0->d; + Message m; + while (fd0->used) { + if(!canReceive(fd0, &m)) + { + EnterMutex(); + canDispatch(d, &m); + LeaveMutex(); + }else{ + printf("canReceive returned error\n"); + break; + } + } +} + +/***************************************************************************/ +UNS8 canSend(CAN_HANDLE fd0, Message *m) +{ + int res; + struct canmsg_t canmsg; + + + canmsg.flags = 0; + canmsg.id = m->cob_id.w; + canmsg.length = m->len; + if(m->rtr){ + canmsg.flags |= MSG_RTR; + }else{ + memcpy(canmsg.data,m->data,8); + } + + if(canmsg.id >= 0x800){ + canmsg.flags |= MSG_EXT; + } + + res = write(fd0->fd,&canmsg,sizeof(canmsg_t)); + if(res!=sizeof(canmsg_t)) + return 1; + + return 0; +} + +/***************************************************************************/ +static const char lnx_can_dev_prefix[] = "/dev/can"; + +CAN_HANDLE canOpen(s_BOARD *board) +{ + int name_len = strlen(board->busname); + int prefix_len = strlen(lnx_can_dev_prefix); + char dev_name[prefix_len+name_len+1]; + int o_flags = 0; + CAN_HANDLE fd0; + + fd0=malloc(sizeof(*fd0)); + if(fd0==NULL) + return NULL; + + /*o_flags = O_NONBLOCK;*/ + + memcpy(dev_name,lnx_can_dev_prefix,prefix_len); + memcpy(dev_name+prefix_len,board->busname,name_len); + dev_name[prefix_len+name_len] = 0; + + fd0->fd = open(dev_name, O_RDWR|o_flags); + if(fd0->fd < 0){ + fprintf(stderr,"!!! Board %s is unknown. See can_lincan.c\n", board->busname); + goto error_ret; + } + + fd0->d = board->d; + fd0->used = 1; + CreateReceiveTask(fd0, &fd0->receiveTask); + return fd0; + + error_ret: + free(fd0); + return NULL; +} + +/***************************************************************************/ +int canClose(CAN_HANDLE fd0) +{ + if(!fd0) + return 0; + fd0->used = 0; + WaitReceiveTaskEnd(&fd0->receiveTask); + close(fd0->fd); + free(fd0); + return 0; +}