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pusirobot/canserver/processmotors.c

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/*
* This file is part of the CANserver project.
* Copyright 2020 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aux.h"
#include "canbus.h"
#include "canopen.h"
#include "cmdlnopts.h"
#include "processmotors.h"
#include "pusirobot.h"
#include "socket.h"
#include <fcntl.h> // open
#include <stdio.h> // printf
#include <string.h> // strcmp
#include <sys/stat.h> // open
#include <unistd.h> // usleep
#include <usefull_macros.h>
static int CANspeed = 0; // default speed, if !=0 set it when connected
// all messages are in format "ID [data]"
message CANbusMessages = {0}; // CANserver thread is master
// basic threads
// messages: master - thread, slave - caller
static void *stpemulator(void *arg);
static void *rawcommands(void *arg);
static void *canopencmds(void *arg);
// handlers for standard types
thread_handler CANhandlers[] = {
{"emulation", stpemulator},
{"raw", rawcommands},
{"canopen", canopencmds},
{NULL, NULL}
};
thread_handler *get_handler(const char *name){
for(thread_handler *ret = CANhandlers; ret->name; ++ret){
if(strcmp(ret->name, name)) continue;
return ret;
}
return NULL;
}
/**
* @brief parsePacket - convert text into can packet data
* @param packet (o) - pointer to CANpacket or NULL (just to check)
* @param data - text in format "ID [byte0 ... byteN]"
* @return 0 if all OK
*/
static int parsePacket(CANmesg *packet, char *data){
if(!data || *data == 0){ // no data
return 1;
}
long info[10]={0};
int N = 0;
char *saveptr = NULL;
for(char *s = data; N < 10; s = NULL, ++N){
char *nxt = strtok_r(s, " \t,;\r\n", &saveptr);
if(!nxt) break;
if(str2long(nxt, &info[N])) break;
}
if(N > 9 || N == 0) return 1; // ID + >8 data bytes or no at all
if(packet){
packet->ID = info[0];
packet->len = N - 1;
}
for(int i = 1; i < N; ++i){
if(info[i] < 0 || info[i] > 0xff) return 2;
if(packet) packet->data[i-1] = (uint8_t) info[i];
}
return 0;
}
// [re]open serial device
static void reopen_device(){
char *devname = NULL;
double t0 = dtime();
canbus_close();
DBG("Try to [re]open serial device");
while(dtime() - t0 < 5.){
if((devname = find_device())) break;
usleep(1000);
}
if(!devname || canbus_open(devname)){
FREE(devname);
LOGERR("Can't find serial device");
ERRX("Can't find serial device");
}else {DBG("Opened device: %s", devname);}
if(CANspeed){ // set default speed
canbus_clear();
canbus_setspeed(CANspeed);
canbus_clear();
}
FREE(devname);
}
// do something with can message: send to receiver
static void processCANmessage(CANmesg *mesg){
threadinfo *ti = findThreadByID(mesg->ID);
if(!ti) return;
DBG("Found");
char buf[64], *ptr = buf;
int l = 64, x;
x = snprintf(ptr, l, "#0x%03X ", mesg->ID);
l -= x; ptr += x;
for(int i = 0; i < mesg->len; ++i){
x = snprintf(ptr, l, "0x%02X ", mesg->data[i]);
l -= x; ptr += x;
}
addmesg(&ti->answers, buf);
}
/**
* @brief CANserver - main CAN thread; receive/transmit raw messages by CANbusMessages
* @param data - unused
* @return unused
*/
void *CANserver(_U_ void *data){
reopen_device();
while(1){
CANmesg cm;
char *mesg = getmesg(&CANbusMessages);
if(mesg){
if(parsePacket(&cm, mesg)){
LOGMSG("Received wrong CAN message: %s", mesg);
DBG("Bad message: %s", mesg);
}else{
if(canbus_write(&cm)){
LOGWARN("Can't write to CANbus, try to reopen");
WARNX("Can't write to canbus");
if(canbus_disconnected()) reopen_device();
}
}
FREE(mesg);
}
usleep(1000);
if(!canbus_read(&cm)){ // got raw message from CAN bus - parce it
DBG("Got CAN message from %d, len: %d", cm.ID, cm.len);
// send raw message to 0
threadinfo *ti = findThreadByID(0);
if(ti){
char buf[64], *ptr = buf;
int l = 64, x;
x = snprintf(ptr, l, "#0x%03X ", cm.ID);
l -= x; ptr += x;
for(int i = 0; i < cm.len; ++i){
x = snprintf(ptr, l, "0x%02X ", cm.data[i]);
l -= x; ptr += x;
}
addmesg(&ti->answers, buf);
}
processCANmessage(&cm);
}else if(canbus_disconnected()) reopen_device();
}
LOGERR("CANserver(): UNREACHABLE CODE REACHED!");
return NULL;
}
/**
* @brief stpemulator - stepper motor emulator
* @param arg - threadinfo
* @return unused
*/
static void *stpemulator(void *arg){
threadinfo *ti = (threadinfo*)arg;
while(1){
char *mesg = getmesg(&ti->commands);
if(mesg){
DBG("Stepper emulator got: %s", mesg);
addmesg(&ServerMessages, mesg);
/* do something */
FREE(mesg);
}
int r100 = rand() % 10000;
if(r100 < 20){ // 20% of probability
addmesg(&ServerMessages, "stpemulator works fine!");
}
if(r100 > 9998){
addmesg(&ServerMessages, "O that's good!");
}
usleep(1000);
}
LOGERR("stpemulator(): UNREACHABLE CODE REACHED!");
return NULL;
}
/**
* @brief rawcommands - send/receive raw commands
* @param arg - threadinfo
* @return unused
* message format: ID [data]; ID - receiver ID (raw), data - 0..8 bytes of data
* ID == 0 receive everything!
*/
static void *rawcommands(void *arg){
threadinfo *ti = (threadinfo*)arg;
while(1){
char *mesg = getmesg(&ti->commands);
if(mesg){
DBG("Got raw command: %s", mesg);
addmesg(&CANbusMessages, mesg);
FREE(mesg);
}
mesg = getmesg(&ti->answers);
if(mesg){ // got raw answer from bus to thread ID, send it to all
addmesg(&ServerMessages, mesg);
FREE(mesg);
}
usleep(1000);
}
LOGERR("rawcommands(): UNREACHABLE CODE REACHED!");
return NULL;
}
// make string for CAN message from command message (NodeID index subindex [data] -> ID data)
static void sendSDO(char *mesg){
long info[8] = {0}; // 0 - NodeID, 1 - index, 2 - subindex, 3..6 - data[0..4]
int N = 0;
char *saveptr = NULL;
for(char *s = mesg; N < 8; s = NULL, ++N){
char *nxt = strtok_r(s, " \t,;\r\n", &saveptr);
if(!nxt) break;
if(str2long(nxt, &info[N])) break;
}
if(N > 7 || N < 3){
WARNX("Got bad CANopen command");
LOGMSG("Got bad CANopen command");
return;
}
DBG("User's message have %d ints", N);
uint8_t data[8] = {0}, datalen = (uint8_t) N - 3;
data[0] = SDO_CCS(CCS_INIT_DOWNLOAD);
if(datalen){ // there's data
data[0] |= SDO_N(datalen) | SDO_E | SDO_S;
for(int i = 0; i < datalen; ++i) data[4+i] = (uint8_t)(info[3+i]);
}
data[1] = info[1] & 0xff;
data[2] = (info[1] >> 8) & 0xff;
data[3] = (uint8_t)(info[2]);
char buf[64], *ptr = buf;
int l = 64, x;
x = snprintf(ptr, l, "0x%03X ", (uint16_t)(RSDO_COBID + info[0]));
l -= x; ptr += x;
for(int i = 0; i < 8; ++i){
x = snprintf(ptr, l, "0x%02X ", (uint16_t)(data[i]));
l -= x; ptr += x;
}
addmesg(&CANbusMessages, buf);
}
// send raw CANopen commands
// message format: NodeID index subindex [data]
static void *canopencmds(void *arg){
threadinfo *ti = (threadinfo*)arg;
while(1){
char *mesg = getmesg(&ti->commands);
if(mesg) do{
DBG("Got CANopen command: %s", mesg);
sendSDO(mesg);
FREE(mesg);
}while(0);
mesg = getmesg(&ti->answers);
if(mesg){ // got raw answer from bus to thread ID, analize it
addmesg(&ServerMessages, mesg);
FREE(mesg);
}
usleep(1000);
}
LOGERR("rawcommands(): UNREACHABLE CODE REACHED!");
return NULL;
}
/**
* @brief setCANspeed - set new speed of CANbus
* @param speed - speed in kbaud
* @return 0 if all OK
*/
int setCANspeed(int speed){
if(canbus_setspeed(speed)) return 1;
CANspeed = speed;
return 0;
}
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