Burr-Brown ads1211

[Inkwaterman]

Hi to everybody !

I try to use the A/D in the subject with a Pic microcontroller, but I have some problem with the serial comunication.

Someone had just use this IC ?

Thanx

[Haplo]

Give us more information about the PIC you are using and your setup, and post your code.

[Inkwaterman]

I use a Pic 18f252 and these are my routine for write ad read through the SPI:


void write_spi(byte data)
{
byte i;
for(i=0; i<8; i++)
{
output_high(PIN_C3);
delay_us(10);
if(bit_test(data,7)) output_high(PIN_C5);
else output_low(PIN_C5);
output_low(PIN_C3);
delay_us(10);
data <<= 1;
}
delay_ms(11);
}


BYTE read_spi()
{
byte i, data=0;

delay_us(10);
for(i=0; i<8;i++)
{
output_high(PIN_C3);
delay_us(10);
if(input(PIN_C5)) bit_set(data, i);
output_low(PIN_C3);
delay_us(10);
}
return(data);
}

I found, in one example for jar compiler, a reset routine for the serial communication. I try to use it but the problems remains.

This is the reset routine (I'm sorry for the unpolite code ; ) ):

void reset_ADS()
{
output_high(PIN_C3);
delay_us(10);
output_low(PIN_C3);
delay_us(10);
output_high(PIN_C3);
delay_us(10);
output_low(PIN_C3);
delay_us(10);
output_high(PIN_C3);
delay_us(10);
output_low(PIN_C3);
delay_us(10);
output_high(PIN_C3);
delay_us(10);
output_low(PIN_C3);
delay_us(10);
output_high(PIN_C3);
delay_us(10);
output_low(PIN_C3);
delay_us(10);
delay_ms(100);
}


Regard

[Neutone]

You should read the manual/help file reguarding the commands shift right and shift left. Performing a bit test/set with a variable bit location is a very dificult task to generate assembly code for. The compiler can do it but it's not efficient. The examples in the manual/help file are just what you need.