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32ch multiplexer

 
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acidice333



Joined: 14 Oct 2006
Posts: 33

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32ch multiplexer
PostPosted: Wed Jun 27, 2012 1:38 pm     Reply with quote
18f4550 pic...

I've got this ADG731 32ch multiplexer but I cant seem to get it to work.

I'm not sure if its my programming (probably 'cause I'm not fluent in programming) or my hardware (simple breakout board)

Basically what I'm trying to accomplish is set it to ch13 (pin48 on ADG) so A0 (pic) read from D (pin43 on ADG731)

Ive got something like this and it is probably wrong. I need to use software SPI.
Code:

/*
sync = c0
din = c1
clk = c2
*/
#use spi(do=pin_c1,clk=pin_c2,enable=pin_c0,enable_active=0,mode=2,bits=8)

    setup_adc_ports(AN0);

    spi_xfer(0x00001100); //select ch13

  while(true) {
    set_adc_channel(0);
    delay_us(50);
    adc = read_adc();
    lcd_gotoxy(2,2);
    printf(lcd_putc,"a0=%3u ", adc);
  }



I have ch13 connected to 5v so I can see if my ADC reading works or not but it doesn't. Yes A0 is working, verified by gnding and 5v (0 / 255)
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jun 27, 2012 2:55 pm     Reply with quote
You didn't show your #fuses or #use delay(). So, I made a test program
with those things and I can now see clock, data, and enable pulses on
my oscilloscope. It's doing SPI mode 2:
Code:

#include <18F4550.h>
#fuses INTRC_IO,NOWDT,PUT,BROWNOUT,CPUDIV1
#use delay(clock=4M)

#use spi(DO=pin_c1,CLK=pin_c2,enable=pin_c0,enable_active=0,mode=2,bits=8)

//======================================
void main(void)
{

while(1)
 {
  spi_xfer(0x55);
  delay_us(100);
 }

}
acidice333



Joined: 14 Oct 2006
Posts: 33

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PostPosted: Wed Jun 27, 2012 8:24 pm     Reply with quote
Figured out my problem Smile

I had the bits in the wrong order and I was using 0x0 instead of 0b0
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