config.c

#include "config.h"
#include "eeprom.h"
#include "util.h"
//#include "commons.h"

config_struct config_defaults = {
    .token="ASU",
    .hi_alarm=0x3FF,
    .hi_warn = 0x3FE,
    .lo_alarm = 0x0000,
    .lo_warn=0x0001,
    .use_static_ip=0,
    .static_ip={192, 168, 1, 100},
    .checksum=0};



int str_compare(char a[],char b[])
{
    int flag=0,i=0;  // integer variables declaration
    while(a[i]!='\0' &&b[i]!='\0')  // while loop
    {
       if(a[i]!=b[i])
       {
           flag=1;
           break;
       }
       i++;
    }
    if(flag==0)
    return 0;
    else
    return 1;
}

void config_init()
{
    while(eeprom_isbusy());  //waits for EEPROM to get out of busy state

    //initialize config
    unsigned int base_addr=0x040;
    int size = sizeof(config_struct);
    unsigned char buf[size+10];
    unsigned char* p = (unsigned char*)&config;

    eeprom_readbuf(base_addr, buf, size);

    //memcpy((unsigned char*)&config, (unsigned char*)buf, size);

    for(int i=0;i<size;i++)
    {
        p[i]=buf[i];
    }

    if(!config_is_data_valid())
    {

        //Write default values to EEPROM location 0x040
        config_write_defaults();

        //Initialize config by reading location 0x040
        eeprom_readbuf(base_addr, (unsigned char*)buf, size);
        //memcpy((unsigned char*)&config, (unsigned char*)buf, size);

        for(int i=0;i<size;i++)
        {
            p[i]=buf[i];
        }

        //Clearing modified flag
        modified=0;

    }

    //uart_writedec32(write_busy);
    //get_writebusy();
}

int config_is_data_valid()
{
    return str_compare(config.token, config_defaults.token) && is_checksum_valid((unsigned char*)&config, sizeof(config_struct));
}

void config_set_modified()
{
    modified=1;
}

void config_update()
{
    if(!eeprom_isbusy() && modified)
    {
        //Update the checksum
        update_checksum((unsigned char*)&config, sizeof(config));

        //Write config to eeprom
        unsigned int base_addr = 0x040;
        int size = sizeof(config_struct);
        unsigned char* p = (unsigned char*)&config;

        eeprom_writebuf(base_addr, p, size);

        //Clearing modified flag
        modified=0;

    }

}

void config_write_defaults()
{
    update_checksum((unsigned char*)&config, sizeof(config));

    //Writing defaults to eeprom
    unsigned int base_addr = 0x040;
    int size = sizeof(config_struct);
    //unsigned char buf[size];
    unsigned char* p = (unsigned char*)&config_defaults;
    //memcpy((unsigned char*)buf, (unsigned char*)&config_defaults, size);

    eeprom_writebuf(base_addr, p, size);
}