ADS 1230 reference code

Hi Mani,

The ads1230 reference code is located in this archive:

ftp://ftp.ti.com/pub/data_acquisition/ADS123xREF/ADS123x_CDROM/Firmware/Firmware_Source_Code/

hi Bob Benjamin,

Thanks lot for value able reply.. i refer your source code its very useful for me .now i almost  got it one gram accuracy 

every one want to know what i was faced next time what i  faced it will not be happen. i  am writing here what faced in this ads1230 

i was used my code to read data in polling method.now i changed interrupt method it is working fine.

sorry for the my bad english

thanks a lot BOB

Regards 

mani

Hi mani,

I am facing same problem like you.

GAIN=128, 10SMPS, 5V ref.

count for 1kg=3300

I am getting fluctuation in ADC reading of 0-10 count between two samples.

 So problem in getting resolution in grams.

Thankful to you for any help.

KD

KD,

10 counts is very close to the level of noise of the converter.  Review the Application Section on page 20.  Make sure you have a quiet supply and reference voltage.

To verify the best possible level of performance with your system, short the inputs together and bias them to 2.5V.  When you take a series of readings you can identify how much noise you have in your system (Peak-to-Peak noise).  If you have a well designed system (including proper layout) you should see the level of noise shown in Table 1 of the datasheet on page 6.

Hope that gets you started,

Bob B

hi  here u told To verify the best possible level of performance with your system, short the inputs together and bias them to 2.5V.  When you take a series of readings you can identify how much noise you have in your system (Peak-to-Peak noise).

but  i don't understand short the inputs together and bias them to 2.5V this line.. that is, Analog pasitive and negative is it correct sir.. if it is correct means where i should give bias 2.5 v...

hi mani.... this one week i am using this project... still i can't get any accuraacy ... i am getting counts but fluctuation.. today evening i will send my hard copy .. pls send me what my problem .. very urgent brother... pls.........My code is

void main()
{
unsigned long receive_data_2,offset_data_1,offset_data_2,display_value;
unsigned char dummy_v,dummy_c;

Port_Config();
receive_data_2=0;
DATA=0;
TRISB=0x00;
TRISD=0x40;
DATA_DIR=1;
SCLK_DIR=0;
GRD_DIR =0;
GAIN=0;


lcdinit();
__delay_ms(25);
lcdcmd(0x01);
__delay_ms(25);
lcdstr(home);
__delay_ms(25);
lcdcmd(0xC0);
__delay_ms(25);
lcdstr(home);
__delay_ms(25);


////////////////////// weight scale initialize////////////////

lcdcmd(0x80);
lcdstr("dummy start");
delay(50);

for(dummy_c=0;dummy_c<=4;dummy_c++)
{

dummy_v=get_adc1230();

}

lcdcmd(0x80);
lcdstr("Offset start");
delay(50);

offset_data_1=offset_calibation_adc1230();

offset_data_2=offset_calibation_adc1230();
display(0xC0,offset_data_2);
/////////////////////////////////////////////////////////////////////////

while(1)
{
DATA_DIR=1;
device_c=0;

receive_data_2=get_adc1230();
display(0x80,receive_data_2);


/*   
       
        if(offset_device_c==1)
        {
       
        __delay_ms(10);
        lcdcmd(0xC4);
        __delay_ms(10);
        lcdstr(dect);
       
        }
        else
        {
       
        __delay_ms(10);
        lcdcmd(0xC4);
        __delay_ms(10);
        lcdstr(ndect);
        }

*/

receive_data_2=0;
offset_data_2=0;
display_value=0;
delay(60);
}
}

void display(unsigned char pos,unsigned long receive_data_dis)
{
unsigned long display_value=0;

__delay_ms(50);
lcdcmd(pos);
__delay_ms(50);



    if ( receive_data_dis < 0x80000 )
    {
    display_value = receive_data_dis >> 1;
    }
    else
    {
    display_value = (( ~( receive_data_dis - 1 ) ) & 0x000FFFFF ) >> 1;      // ¸ºÊý ( È¡19λADÖµ, ÆÁ±Î5λ )
    //display_value = -display_value;
    //ES = 1;                                                                //
    }

lcdchar(((display_value/10000000)+0x30));
lcdchar((((display_value/1000000)%10)+0x30));
lcdchar((((display_value/100000)%10)+0x30));
lcdchar(((display_value/10000)%10)+0x30);
lcdchar(((display_value/1000)%10)+0x30);
lcdchar(((display_value/100)%10)+0x30);
lcdchar(((display_value/10)%10)+0x30);
lcdchar((display_value % 10)+0x30);
}


unsigned long get_adc1230()
{
unsigned long receive_data=0;;
unsigned char clk=0;

SCLK=0;
NOP();
NOP();
NOP();
NOP();


while(DATA);

device_c=1;

    NOP();
    NOP();
    NOP();
   
    for(clk=0;clk<=19;clk++)
    {
    SCLK=1;
    __delay_ms(2);

    SCLK=0;
    __delay_ms(2);
   

/*   
    NOP();
    NOP();
    NOP();
    NOP();
*/              
receive_data=receive_data<<1;

            if ( DATA == 1 )
              receive_data|= 0x00000001;//0000 0000 0000 0000 0001
            else
            receive_data &= 0x000FFFFE;//1111 1111 1111 1111 1110
            NOP();
            NOP();
    }



//DATA_DIR=0;
//DATA=1;


__delay_ms(25);
lcdcmd(0x8D);
__delay_ms(25);
lcdchar((clk/10)+0x30);
lcdchar((clk % 10)+0x30);

return(receive_data);
}

///////////////////////////////////////////////////////////////////
////////////offset calibaration

unsigned long offset_calibation_adc1230()
{
unsigned long offset_receive_data=0;;
unsigned char offset_clk=0;

SCLK=0;
NOP();
NOP();
NOP();
NOP();


while(DATA);
//offset_device_c=1;
NOP();
NOP();
NOP();
   
   
    for(offset_clk=0;offset_clk<=25;offset_clk++)
    {
    SCLK=1;
    __delay_ms(2);

    SCLK=0;
    __delay_ms(2);
              
   
        if(offset_clk<=19)
        {
        offset_receive_data=offset_receive_data<<1;

            if ( DATA == 1 )
              offset_receive_data|= 0x00000001;//0000 0000 0000 0000 0001
            else
            offset_receive_data &= 0x000FFFFE;//1111 1111 1111 1111 1110
            NOP();
            NOP();

                if(offset_clk==19)
                {
                DATA_DIR=0;
                DATA=1;
                //__delay_us(50);
                DATA_DIR=1;
                delay(32);
                }
        }
   
    }




   
   


return(offset_receive_data);
}



///////////////////////////////////////////////////////////////////////////
// Initialise system
static void Port_Config(void)
{
ADCON1 = 0x0F; // Default all pins to digital see datasheet

// Configure ports as inputs (1) or outputs(0)
TRISA = 0b00000000;
TRISB = 0b00000000;
TRISC = 0b00000000;
TRISD = 0b00000000;
TRISE = 0b00000000;

// Clear all ports
PORTA = 0b00000000;
PORTB = 0b00000000;
PORTC = 0b00000000;
PORTD = 0b00000000;
PORTE = 0b00000000;

}





void delay(unsigned int time)
{
int i,j;

for(i=0;i<=time;i++)
{
__delay_ms(25);
}

}

hi mani can u send me your source code plz bcoz i am interfacing with ads 1230 first time

if you don't want to send souce code then give me instruction to write my code

but if u send source code then it will be good

thanks in advance....

Anip.

 Suresh Murugesan,

hello Suresh in your code in that

in the "display " routine why u right shift the data & then going for display also for negative number u complement the data what is the reason behind this

so please give me justification about your display routine

thanks in advance

                                             Anip.

Dear Tom,

Can I get the sample code in C not embedded asm..

Regards,

Navin Rana

Navin,

The link Tom provided contains the complete zip archive of the software for the project utilizing msp430-gcc.  I will give the link again:

ftp://ftp.ti.com/pub/data_acquisition/ADS123xREF/ADS123x_CDROM/Firmware/Firmware_Source_Code/Source_for_123XREF_firmware-1.1.0d.zip

Best regards,

Bob B