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mohanade
Joined: 13 Sep 2008
Posts: 3
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| RS232 problem 16F877a and Max232 |
 Posted: Sat Sep 13, 2008 11:06 am |
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I am having problems with the RS232 connection.
I have a 16f877a chip connected to max232 chip for serial communications.
The program sends the information correctly to the hyper terminal. But sending bytes from the hyperterminal to the chip does not work.
I don't know if it's a software or a hardware problem. Could someone direct me to figuring out the solution.
here is the code i am using
| Code: |
//#include <16F877A.h>
#device adc=10
#use delay(clock=20000000)
#fuses NOWDT,HS, BROWNOUT, LVP
#use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#use i2c(Master,Slow,sda=PIN_C4,scl=PIN_C3)
void HeartBeat(unsigned int beat)
{
if( beat%2 == 0)
{
output_d(0x01);
}
else
{
output_d(0x00);
}
delay_ms(1000);
}
void main()
{
int status;
char value;
unsigned int i;
setup_adc_ports(A_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_4);
setup_counters(RTCC_INTERNAL,RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
set_tris_d(0x00);
output_d(0x01);
do
{
printf("Testing\r\n");
printf("%u\r\n",i);
i++;
printf("Write Something\r\n");
value = getch();
putc(value);
//HeartBeat
HeartBeat(i);
}while (TRUE);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Sep 13, 2008 11:29 am |
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Try using a simple test program. Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=32631&start=1
Notice the test program has the ERRORS parameter in the #use rs232()
statement. Put that in all your programs.
Also, are you using a Low Voltage Programmer ? You have the LVP fuse
set. That fuse should only be set if you have an LVP programmer, which
are rare, and homebuilt. |
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mohanade
Joined: 13 Sep 2008
Posts: 3
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| Posted: Sun Sep 14, 2008 10:18 am |
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| Thanks.. i fixed the fuses and now it works. |
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