DOUBTS AFE031

update:

it seems I am receiving something from the pin 14..but it is the opposite what i should receive, for example:

I send 1111-1111-11 (10 bits) to the dac register and i receive a 0V in the pin 14.
i send 0000-0000-00 (10 bis) to the dac register and i receive 1.4V in the pin 14.

I have set the register:
enable1= set dac,rx,tx and PA bit
enable2= set ref2,ref1 bit

anyway in my power line i cant see any modulation, it keeps staying at 24V

in the PA_OUT (pin 43 and 42) i get 6V always.

If you have not debugged this issue yet please post your schematic and listing of you code so I can look into it.

Good afternoon,

Here is my schematic, following what the tidu160 PDF from TI says:

My code is a bit complicated but I did an special code just to see if the AFE031 responds and gives me an output, here is that easy code:

#ifndef F_CPU // if F_CPU was not defined in Project -> Properties
#define F_CPU 1000000UL // define it now as 6 MHz unsigned long
#endif

#include <avr/io.h> // this is always included in AVR programs
#include <util/delay.h>
#include <avr/interrupt.h>

int main(void)
{
DDRB &= ~(1 << PB2); // clear DDRB bit 2, sets PB2 (pin 3) for input DOUT FROM MODEM
DDRA |= (1 << PA1); // set DDRA bit 1, sets PA1 (pin 19) for output SCLK TO THE MODEM
DDRA |= (1 << PA2); // set DDRA bit 2, sets PA2 (pin 18) for output DIN TO THE MODEM
DDRA |= (1 << PA4); // set DDRA bit 4, sets PA4 (pin 14) for output CS TO THE MODEM
DDRA |= (1 << PA5); // set DDRA bit 5, sets PA5 (pin 13) for output DAC TO THE MODEM
DDRA |= (1 << PA6); // set DDRA bit 6, sets PA6 (pin 12) for output SD TO THE MODEM
DDRA |= (1 << PA7); // set DDRA bit 7, sets PA7 (pin 11) for output INT TO THE MODEM

int i, iter;
int address1=500;

PORTA |=(1 << PA4);                       //SET CS
_delay_ms(500);
PORTA &=~(1 << PA5);            //CLEAR DAC
_delay_ms(500);
PORTA &=~(1 << PA4);           //CLEAR CS
_delay_ms(500);
PORTA |=(1 << PA5);               //SET DAC
_delay_ms(500);

while (1)
{
for (i=512, iter=512; i>=1; i>>=1, iter--) //check every bit of the command
{
if (address1 & i)
PORTA |=(1 << PA2); //DATA SIGNAL HIGH
else
PORTA &=~(1 << PA2); //DATA SIGNAL LOW

_delay_ms(500);
PORTA |=(1 << PA1); //CLOCK SIGNAL HIGH
_delay_ms(500);
PORTA &=~(1 << PA1); //CLOCK SIGNAL LOW
}
PORTA &=~(1 << PA2); //DATA SIGNAL LOW
_delay_ms(500);
PORTA |=(1 << PA4);                                //SET CS
_delay_ms(500);
PORTA &=~(1 << PA5);                       //CLEAR DAC
_delay_ms(10000);
PORTA &=~(1 << PA4);                        //CLEAR CS
_delay_ms(500);
PORTA |=(1 << PA5);                              //SET DAC
_delay_ms(500);
}

}