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FMOpt2000
Joined: 10 Jan 2008
Posts: 17
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| PIC18LF4525 and RS232 issue |
 Posted: Thu Nov 10, 2011 3:18 am |
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Hi, I'm using the PIC18LF4525.
I wrote a lot of firmware and it hasn't problem, but now, I have a problem with the serial port.
I've reduced the firmware at those few line.
Could you help me?
The signal on pin C6 is low and I don't see any activity.
| Code: |
#include <18F4525.h>
#device ICD=TRUE
#device adc=10
#FUSES NOWDT
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
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| Code: |
#include "main.h"
char command;
int1 app_debug=0;
void main()
{
setup_adc_ports(AN0_TO_AN2|VSS_VDD);
setup_adc(ADC_CLOCK_INTERNAL|ADC_TAD_MUL_6);
setup_psp(PSP_DISABLED);
setup_spi(SPI_SS_DISABLED);
//setup_timer_0(RTCC_INTERNAL);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_32);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);
disable_interrupts(INT_RTCC);
setup_oscillator(OSC_8MHZ|OSC_TIMER1|OSC_31250|OSC_PLL_OFF);
while(1)
{
command='U';
putc(command);
if(app_debug==1)
{
output_low(pin_d7);
app_debug=0;
delay_ms(255);
}
else
{
output_high(pin_d7);
app_debug=1;
delay_ms(255);
}
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19439
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| Posted: Thu Nov 10, 2011 3:59 am |
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Are you _sure_ you are using LVP?.
99.9% of programmers do not.
If you are, and with the LVP fuse selected as you have, you _must_ have a pull down resistor on the PGM pin (B5), or the chip won't run.
Secondary comment:
setup_spi(SPI_SS_DISABLED);
is the wrong syntax. The command to turn off SPI is:
setup_spi(FALSE);
This is a bug in the wizard (has been around for years.....).
Third comment. You momentarily enable INT_TIMER0, but don't show any handler for this. This risks crashing the chip. _Never_ enable an interrupt without a handler...
Fourth comment. Add the keyword 'ERRORS' to the #USE RS232 setup. This _must_ always be present, if using the hardware UART, unless _you_ add code to handle serial errors. If it is missed, and the RX input is not permanently high, the UART _will_ become hung.
Fifth comment. Look again at your setup_oscillator line. You can't have three oscillators all selected as the master oscillator.....
All you need is:
setup_oscillator(OSC_8MHZ);
Best Wishes |
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FMOpt2000
Joined: 10 Jan 2008
Posts: 17
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| Posted: Thu Nov 10, 2011 9:02 am |
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Thx!
I'm not sure about nothing!!
I'm a beginner and I did my schematic copying my colleagues.
I've an ICD-U40;I haven't the resistor on B5 and the PIC is running.
I'm going to correct like you say.
This is the problem on RS232:
I worked on a folder for a week, modifying the firmware.
After I have done a copy of my firmware folder and I've worked on this new folder (I've added the fuse for RS-232 to the main).
But the modify is applied on the old main file (not for the new folder)...
I thought the references were local references, not absolute references. |
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