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multi analog channel on 16c771

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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Dec 04, 2006 3:13 pm

I don't have vs. 2.707. The closest I have is vs. 2.705. I made the
test program shown below and looked at the .LST file. The A/D
functions appear to produce the correct ASM code. This test program
is only for 8-bit A/D output, but it does show how to switch channels.
Try doing a simple program like this one, to see if you can get it
working with two A/D channels.

Code:

#include <16C771.h>
#fuses XT,NOWDT,PUT,BROWNOUT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_B1, rcv=PIN_B0)

#bit ADFM_BIT = 0x9F.7

void main()
{
int result_0;
int result_1;

setup_adc_ports(sAN0 | sAN1 | VSS_VDD);
setup_adc(ADC_CLOCK_DIV_64);

ADFM_BIT = 1; // Right justify the result

while(TRUE)
{
set_adc_channel(0);
delay_us(20);
result_0 = read_adc();

set_adc_channel(1);
delay_us(20);
result_1 = read_adc();

printf("result 0 = %x\n\r", result_0);
printf("result 1 = %x\n\r", result_1);

}

}

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