Search found 6 matches

That's right. I used 5V source from FT232RL. Normally it's good but when mrf24j40MB module transmits, a large current sinks. ADC got after 10 or maybe 15ms will be unstable 'cause RF will restransmit ...

problem's inside timer isr. When Fifo_lock = 1, the read_adc() got a little higher value (191 and normal it's 185). before that i disable and re-enable timer interrupt.

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I wrote a code to get ADC every 4ms. I use 18f887 with 20MHz crystal. Everything works fine till i try to get some more samples while waiting for RF module. The buffer takes 2 or 3 more, problem is wh ...

From your code, i think you try to use A0 for ADC. Set up ADC with this:
setup_adc_ports(AN0);//or setup_adc_ports(ALL_ANALOG)
set_adc_channel(0);
setup_adc(ADC_CLOCK ...

Thanks PCM. It did work. my silly Embarassed

setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);

#include "16f887.h"
#device adc=8
#device *=16
#include "ham.h" // contain ADC set up.
#include <stdio.h>
#FUSES HS, NOWDT
#use delay(clock=8000000)
#use rs2 ...