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piire
Joined: 04 Mar 2009
Posts: 19
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| 16F877 to 18F6622 |
 Posted: Tue Mar 16, 2010 4:18 pm |
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Hi there,
I have tested my code on the 16F877 and it works brilliantly. I have had
to change to the 18F6622 as I need two hardware usarts now.
So when I connected up the 18f6622, I started to test the two usart, but I
came across a problem:
This is the test code I'm using: (switch between usart by using pc1 or pc2)
| Code: |
#include <18F6622.h>
#fuses HS,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=pc1,ERRORS)
//#use rs232(baud=9600,xmit=PIN_G1,rcv=PIN_G2,bits=8,stream=pc2,ERRORS)
void main(void)
{
while(1)
{
fprintf(pc,"Testing123");
}}
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1. I started by testing usart 1 which is pins c6 & c7. The first time I get
continuous 'Testing123' in the serial port monitor in PCWH, which is correct.
2. Then I switch to usart 2 which is pin g1 & g2. Then I don't get
'Testing123', but get 00 00 00 00 00 00 00 in the HEX window.
It does show that I am receiving bit as the RXD light is flashing in the
serial port monitor in PCWH.
3. So I switch back to usart 1 and the same thing happens 00 00 00 00 00 00.
I tried the code with only one #use rs232 and no stream and change
fprintf to printf, but still the same problem.
I don't understand. What is going on?
Has anyone had this problem before?
Any help is appreciated...
Thanks
piire! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 16, 2010 4:25 pm |
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What is your compiler version ?
Are you testing this in hardware, or Proteus ? |
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piire
Joined: 04 Mar 2009
Posts: 19
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| Posted: Tue Mar 16, 2010 4:29 pm |
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I'm using 4.104 and its on hardware.
thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 16, 2010 5:39 pm |
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| Quote: | | 3. So I switch back to usart 1 and the same thing happens 00 00 00 00 00 00. |
Turn the power off, and then on again. Check all your connections. |
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piire
Joined: 04 Mar 2009
Posts: 19
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| Posted: Thu Mar 18, 2010 9:14 am |
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hi there, i checked the connection and they look fine, but i think there is a problrm with something else as, i have found sometime both rs232 ports work, and sometimes it gives 00 00 00 00. so i tried a simple toggle led code, the led should blink 3 times quickly and it didnt work correctly either. the led turn on for longer than normal, but it did do it 3 times, but very slowly. is there something wrong with the fuses or oscillator?
the code i used:
| Code: |
#include <18F6622.h>
#fuses HS,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=20000000)
void main(void)
{
int i =0;
while(i<3){
output_high(PIN_C5);
delay_ms(500);
output_low(PIN_C5);
delay_ms(500);
i++;
}
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thanks
piire |
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