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shooter
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| 16F88 restarts on incoming RS232 data |
 Posted: Sun Feb 11, 2007 9:57 am |
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Hello everybody,
my big problem is that everytime I send some data by the rs232 from my computer to the 16F88 he restarts. Any idea what could be the problem?
I find out if the PIC restart 'cause I light up for 500ms a green LED. Is the interrupt called a red LED schould light up, but nothing happend because the PIC restarts befor.
| Code: | // Config
#include <16F88.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES PUT //Power Up Timer
#FUSES MCLR //Master Clear pin enabled
#FUSES NOBROWNOUT //No reset when brownout detected
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#use delay(clock=8000000)
// Using hardware-USART
#use rs232(baud=9600,parity=N,xmit=PIN_B5,rcv=PIN_B2,bits=8)
// Interrupt for incoming rs232 data
#int_RDA
RDA_isr()
{
output_high(PIN_A6); // red-LED to give my a sign interrupt called
putc(getc()+2); // return me a sign on Hyperterminal
}
void main() {
// Init
port_b_pullups(TRUE);
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_ccp1(CCP_OFF);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_8MHZ|OSC_INTRC);
// Give ma a sign that PIC restarts
output_high(PIN_A0); // green-LED
delay_ms(500);
output_low(PIN_A0);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
while (1) {
// give ma a sign that PIC is working and successfully programmed
output_low(PIN_A1);
delay_ms(500);
output_high(PIN_A1);
delay_ms(500);
output_low(PIN_A6);
}
} |
I'm slowly going to be crazy because I'm searching for the error for over 1 week now with no success.
I hope somebody has any idea that can fix this problem.
Thank you!
Benny |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Feb 11, 2007 3:05 pm |
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I tested your program with PCM vs. 3.249, and I couldn't duplicate your
problem. The program never re-started. It fact, it didn't work with
regard to the RS-232 at all.
The reason is because of the "setup_spi(FALSE)" statement. In the
16F88, the Rx and the SDO pins are both on Pin B2. When you put
in the setup_spi(FALSE), the compiler generates this ASM code:
| Quote: |
......... setup_spi(FALSE);
0077: BCF 14.5
0078: BSF 03.5 // Bank 1
0079: BCF 06.2 // TRISB.2 = output
007A: BSF 06.1 // TRISB.1 = input
007B: BCF 06.4 // TRISB.4 = output
007C: MOVLW 00
007D: BCF 03.5
007E: MOVWF 14
007F: BSF 03.5
0080: MOVWF 14 |
It's setting the Rx pin as an output. This prevents the UART from
receiving characters from your PC. The program can't work, until
you delete the setup_spi(FALSE) statement. The SPI module is
disabled on power-on reset anyway. You don't need that line of code. |
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shooter
Guest
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| Posted: Sun Feb 11, 2007 4:02 pm |
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Hello
Big thank you. Great It works!
I should learn ASM 
Thanks again, my problem is now solved!
Greetings, Benny! |
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