int main()
{
int i, fd; // fd is file descripter
int pages;
char* recv_data;
char* sent_data;
unsigned long position;
int option;
int res,pos, usr_res, ren;
char* random_string = NULL;
fd= open(DEVICE,O_RDWR);
if(fd==-1)
{
printf("file %s either does not exit or is currently used by an another user\n", DEVICE);
exit(-1);
}
printf ("\nUser has given Open command\n");
/******************************************************************************************************/
while (1) {
option = 0;
printf("Enter option you want to choose:\n Press 1 to set page\n Press 2 to write\n Press 3 to read\n Press 4 to get the current page position\n Press 5 to erase\n Press 6 to get status of EEPROM\n Press 7 to exit\n");
scanf("%d",&option);
switch (option)
{
case 1:
printf("Enter the current page position you wish to set (0 to 511)\t");
scanf("%ld",&position);
ioctl(fd,IOCTL_FLASHSETP, position); //ioctl call
break;
case 2:
printf ("\n How many pages you want to write?(1 to 512)\t");
scanf("%d",&pages);
sent_data = (char*)malloc(sizeof(char)*64*pages);
random_string = (char *)malloc(sizeof(char) * pages * 64);
random_string_gen(random_string, pages * 64);
strcpy(sent_data, random_string);
write(fd,sent_data, pages);
printf("\ndata to be sent is:%s\n",sent_data);
free (sent_data);
break;
case 3:
printf ("\n How many pages you want to read? (1 to 512)\t");
scanf("%d",&pages);
recv_data = (char*)malloc(sizeof(char)*64*pages);
printf("Your messsage is being enqueued or EEPROM is busy. Please wait...");
// to poll till data is ready. Note that because of polling pointer will not return to user space immediately. A user needs to make at least two read() calls to get the data back. In two different cases, pointer will retrun immediately.
do
{
res = read(fd, recv_data, pages);
usleep(1);
}while(res!= 0);
recv_data[64*pages] = '\0';
printf("\nReturn value is:%d\n", res);
printf("\nMessage from process is:%s\n", recv_data);
free (recv_data);
break;
case 4:
ioctl(fd,IOCTL_FLASHGETP, &pos ); //ioctl call
printf("Current pointer is at %d\n", pos);
break;
case 5:
ren = ioctl(fd,IOCTL_FLASHERASE, 1); //ioctl call
if ( ren != 0)
printf ("Wait.! EEPROM is Busy\n");
else
printf("The EEPROM is erased\n");
break;
case 6:
usr_res = ioctl(fd,IOCTL_FLASHGETS, 1);
if ( usr_res != 0)
printf ("Status of EEPROM is - Busy\n");
else
printf ("Status of EEPROM is - Available\n");
break;
case 7:
close(fd);
printf("User has given close command\n");
return 0;
default:
printf("Invalid Option. Try Again!\n");
break;
}
}
}
int main(int argc,char** argv,char** uenv)
{
int i;
int j;
int res;
int fd;
char* data;
char* recv_data;
char* page_data;
int send_pages = 10;
int recv_pages = 10;
int page_size = 64;
// Seeding for the rand function
srand(time(NULL));
data = (char*)malloc(sizeof(char)*page_size*send_pages);
recv_data = (char*)malloc(sizeof(char)*page_size*recv_pages);
page_data = (char*)malloc(sizeof(char)*page_size+1);
// Opening the device file
fd = open(FILENAME,O_RDWR);
if(fd == -1){
printf("Error opening %s: %s \n",FILENAME,strerror(errno));
return -1;
}
res = ioctl(fd, I2C_SLAVE,DEVICE_ADDR);
if(res < 0){
printf("Error setting the device address \n");
return -1;
}
//Creating random string
random_string_gen(data,send_pages);
printf("DATA SEND \n");
print_string_pagewise(data,send_pages);
printf("\n---------------------------------------------------------\n");
// Writing the data
res = write(fd ,data,send_pages);
if(res == -1){
printf("Error writing to EEPROM \n");
return -1;
}
// Seeking
res = lseek(fd,0,SEEK_SET);
if(res == -1){
printf("Error seeking EEPROM: \n");
return -1;
}
// Reading the data
res = read(fd,recv_data,recv_pages);
if(res == -1){
printf("Error writing to EEPROM: \n");
return -1;
}
printf("RECEIVED DATA: \n");
print_string_pagewise(recv_data,recv_pages);
close(fd);
return 0;
}
