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ik1wvq
Joined: 21 Feb 2004
Posts: 20
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| PCD problems on reading port_B .. HELP PLEASE! |
 Posted: Mon Sep 15, 2008 6:18 am |
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Hi,
PCD 4.079
3FJ128GP706
PROBLEM:
I try to read the PORTB ( whole with "input_b()" or single pin with "input(pin_rb11) ")
The results is all zeroes.
This my trivial program:
| Code: |
#include <33FJ128GP706.h>
#type unsigned
#Fuses NOWRTB,NOBSS,NOPROTECT
#Fuses NOWRT,PR_PLL,XT,NOCKSFSM
#Fuses NOOSCIO,NOWDT,NOWINDIS,WPRES128
#Fuses PUT128
#Fuses NODEBUG,NOCOE,NOJTAG
#define LED_ROSSO PIN_B10
#word PLLFBD=0x746
#word CLKDIV=0x744
#use delay(clock=77414400, restart_wdt)
#use rs232(BRGH1oK,baud=9600,UART2, ERRORS,RESTART_WDT)
void main(void)
{
PLLFBD=84; // M=75
CLKDIV=0b0000000000000000; // N1=2 N2=2
delay_ms(50);
output_high(LED_ROSSO);
gira:
restart_wdt();
delay_ms(100);
printf("\rRB->%lX - ",input_b());
printf("RG->%lX - ",input_g());
printf("RF->%lX",input_f());
output_toggle(LED_ROSSO);
goto gira;
}
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The OUTPUT is:
"RB->0000 - RG->010E - RF->005E"
RG and RF follow the state of the inputs, RB is ALWAYS ZERO ..
What happens ???
Thanks in advance
Regards
Mauro |
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glap
Guest
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| Posted: Mon Sep 15, 2008 7:39 am |
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Try to set the input port in digital mode (setup_adc_ports).
Bye
Gaetano |
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Guest
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| Posted: Tue Sep 16, 2008 1:36 am |
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thanks anyway , but still dont work ..
ragards |
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ik1wvq
Joined: 21 Feb 2004
Posts: 20
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| Posted: Tue Sep 16, 2008 1:38 am |
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thanks anyway , but still dont work ..
ragards |
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ik1wvq
Joined: 21 Feb 2004
Posts: 20
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| Posted: Fri Sep 19, 2008 3:50 am |
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Hi,
I found myself the solution!
The chip 33FJ128GP706 has TWO analog_to_digital modules, and then, we MUST declare:
setup_adc_ports(no_analogs); // useless, because the compiler produces itself the relative code
setup_adc_ports2(NO_ANALOGS); // this line mandatory
Putting this lines the portb work fine!
I write this to CCS:
....
This matter (two analog modules) is unclear in the microchip manual, and also in your manual.
Please explain this problem to all other developers.
I found this by ten trials.
Mauro |
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