bus.c
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#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include "printx.h"
#include "ui.h"
#include "nfc.h"
#include "hvc.h"
#include "heat.h"
#include "pump.h"
#define CMD_MAX 70
#define KEY 1100
#define SEM_NUMBER 2
#define SEM_INPUT 0
#define SEM_OUTPUT 1
int bus;
bool busFree = true;
bool busStop = false;
int mySem;
int get_sem(int i)
{
ushort semarr[30];
union semun
{
int val;
struct semid_ds *buf;
ushort *array;
}arg;
arg.array = semarr;
semctl(mySem, i, GETALL, arg);
return semarr[i];
}
void show_sem(int i)
{
int val;
val = get_sem(i);
printf("semaphore[%d]=%d\n", i, val);
}
void create_sem(int N)
{
printx(DEBUG, BUS, "create %d semaphores\n", N);
mySem = semget(KEY, N, 0666 | IPC_CREAT);
if(mySem < 0)
printx(ERROR, BUS, "Unable to create the semaphore\n");
}
void init_sem(int N)
{
int j;
int retval;
union semun
{
int val;
struct semid_ds *buf;
ushort *array;
}arg;
arg.val = 1;
for (j=0; j<N; j++)
{
retval = semctl(mySem, j, SETVAL, arg);
if(retval < 0)
printx(ERROR, BUS, "Unable to initialize the semaphore\n");
}
}
void PV(int i, int act)
{
struct sembuf op;
int retval;
op.sem_num = i;
op.sem_op = act; //1=V, -1=P
op.sem_flg = 0; //will wait
retval = semop(mySem, &op, 1);
if(retval != 0)
printx(ERROR, BUS, "Error semop will do %d\n", act);
}
void P(int i)
{
PV(i, -1);
}
void V(int i)
{
PV(i, 1);
}
void stopBus()
{
busStop = true;
}
void processCmd(char* buffer)
{
buffer[strlen(buffer)-1]='\0';
if(strcmp(buffer, "quit") == 0 || strcmp(buffer, "exit") == 0)
{
printx(INFO, BUS, "Exit request receved, processing ...\n");
stopNFC();
stopHVC();
stopBus();
stopUI();
}
else if(strcmp(buffer, "setpumpon") == 0)
{
printx(INFO, BUS, "Setting PUMP ON");
setPumpWantedState(true);
}
else if(strcmp(buffer, "setpumpoff") == 0)
{
printx(INFO, BUS, "Setting PUMP OFF");
setPumpWantedState(false);
}
else if(strcmp(buffer, "setheaton") == 0)
{
printx(INFO, BUS, "Setting HEAT ON");
setHeatWantedState(true);
}
else if(strcmp(buffer, "setheatoff") == 0)
{
printx(INFO, BUS, "Setting HEAT OFF");
setHeatWantedState(false);
}
else if(strcmp(buffer, "setheaton2s") == 0)
{
printx(INFO, BUS, "Setting HEAT ON for 2 secs");
setHeatTimer(2);
setHeatWantedState(true);
}
else if(strcmp(buffer, "setheaton5s") == 0)
{
printx(INFO, BUS, "Setting HEAT ON for 5 secs");
setHeatTimer(5);
setHeatWantedState(true);
}
else if(strcmp(buffer, "setheaton10s") == 0)
{
printx(INFO, BUS, "Setting HEAT ON for 10 secs");
setHeatTimer(10);
setHeatWantedState(true);
}
else if(strcmp(buffer, "setheaton15s") == 0)
{
printx(INFO, BUS, "Setting HEAT ON for 15 secs");
setHeatTimer(15);
setHeatWantedState(true);
}
else if(strcmp(buffer, "setpumpon5s") == 0)
{
printx(INFO, BUS, "Setting PUMP ON for 5 secs");
setPumpTimer(5);
setPumpWantedState(true);
}
else if(strcmp(buffer, "setpumpon10s") == 0)
{
printx(INFO, BUS, "Setting PUMP ON for 10 secs");
setPumpTimer(10);
setPumpWantedState(true);
}
else if(strcmp(buffer, "autoheat") == 0)
{
printx(INFO, BUS, "Processing Auto Heat to 90°C");
processHeat(NULL);
}
else if(strcmp(buffer, "stopautoheat") == 0)
{
printx(INFO, BUS, "Auto Heat has been stopped");
stopAutoHeat();
}
//printx(DEBUG, BUS, "STRLEN : %d and strcmp ret %d", strlen(buffer), strcmp(buffer, "quit"));
}
void* processBus(void* we)
{
bus = open("bus.log", O_RDWR);
char buffer[CMD_MAX];
printx(DEBUG, BUS, "Waiting for events\n");
while(!busStop)
{
P(SEM_OUTPUT);
printx(DEBUG, BUS, "Event receved !\n");
busFree = false;
lseek(bus, 0, SEEK_SET);
printx(DEBUG, BUS, "Data read %d\n", read(bus, buffer, CMD_MAX));
ftruncate(bus, 0);
sync();
processCmd(buffer);
busFree = true;
printx(DEBUG, BUS, buffer);
V(SEM_INPUT);
usleep(2);
}
return NULL;
}
bool initBus()
{
create_sem(SEM_NUMBER);
printx(ERROR, BUS, "Oh dear, something went wrong with %s !\n", strerror(errno));
init_sem(SEM_INPUT);
init_sem(SEM_OUTPUT);
bus = creat("bus.log", 0666);
if(bus == -1)
{
printf("Unable to open the bus file\n");
return false;
}
return true;
}
void sendToBus(char* cmd)
{
printx(DEBUG, BUS, "Control semaphore %d in %d out %d\n", mySem, get_sem(SEM_INPUT), get_sem(SEM_OUTPUT));
P(SEM_INPUT);
ftruncate(bus, 0);
ftruncate(bus, CMD_MAX);
lseek(bus, 0, SEEK_SET);
dprintf(bus, "%s\n", cmd);
V(SEM_OUTPUT);
}