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mojo
Joined: 26 Sep 2006
Posts: 2
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| kbhit problem getting value into main |
 Posted: Tue Sep 26, 2006 3:02 pm |
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I am usually a labview programmer (i like the graphica programming better  ) so I may be doing something really stupid.
I am trying to use the kbhit to determine if a char has been received on the serial port. If one has not, then it should timeout after 5 sec and continue to status 2.
If a char is received and it is A, then the program should go to status 1.
But what I am seeing now if that it will always timeout and will then go to status 1 (which it is defined as at the begining of the program, and is not changed like it should to status 2)
Any help would be appreciated.
| Code: | #include "C:\Bradley\solar light dimmer\ld81505.h"
#include <input.c>
#include <math.h>
// The following initializes the first 4 locations of the data EERPOM
// using the #ROM directive
#IF defined (__PCM__)
#rom 0x2100={1,2,3,4} //initalizes ROM by inserting 1,2,3,4
#elif defined(__PCH__)
#rom int 0xf00000={1,2,3,4}
#endif
int16 photo,saved;
char answer, quit;
float photo2,on_time2,off_time2,saved2,value2,voltage;
float valuea=0,valueb=0,valuec=0,valued=0,valuee=0;
float valuef=0,valueg=0,valueh=0,valuei=0;
int timer1_flag=0,intcounter=0,light_toggle=0,zero_cross_flag=0,status=1;
long int trigger_delay=45000;
int light_set=1;
short timeout_error;
#int_ext
void zerocross_isr() {
zero_cross_flag=1;
}
#int_Timer1
Timer1_isr()
{ output_high(PIN_C0);
delay_us(600);
output_low(PIN_C0);
}
#separate
a_d_conversion(){
valuea=read_adc();
delay_us(100);
valueb=read_adc();
delay_ms(2);
valuec=read_adc();
delay_ms(2);
valued=read_adc();
delay_ms(2);
valuee=read_adc();
delay_ms(2);
valuef=read_adc();
delay_ms(2);
valueg=read_adc();
delay_ms(2);
valueh=read_adc();
delay_ms(2);
valuei=read_adc();
delay_ms(2);
valuea=(valueb+valuec+valued+valuee+valuef+valueg+valueh+valuei)/8;
}
char timed_getc(){
long timeout;
timeout_error=FALSE;
timeout=0;
while(!kbhit()&&(++timeout<50000))//wait 5 sec for user input
delay_us(100);
printf("\r\nTime\n\r");
delay_ms(10);
if(!kbhit())//if no character availble
status=2;
else {
timeout_error=TRUE;
//return(getc());
answer=getc();//get char
//printf("\r\nTimeout\n\r");
//delay_ms(10);
status=1;//if char is received, go to calibration mode
}
status=2;
}
void main()
{
byte i,j;
byte address=00; //initalize values
int16 value;
int on_time=133, off_time=133;
int16 m,l,k,p=0;
setup_adc_ports(RA0_RA1_RA3_ANALOG);
setup_adc(ADC_CLOCK_Internal);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_counters(RTCC_INTERNAL,RTCC_DIV_1);
setup_timer_1(T1_internal|T1_DIV_BY_1);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
//enable_interrupts(INT_EXT);//disabled to allow use of B0
//enable_interrupts(GLOBAL);
printf("\f"); //clears screen
delay_ms(10);
printf("\n\r");
delay_ms(10);
// printf("*****\n\r");
// delay_ms(10);
printf("A=Calibrate to 400\n\r");
delay_ms(10);
//printf("B= Test Cell\n\r");
//delay_ms(10);
output_high(PIN_C0);//turns light on at full power
delay_ms(6000);
output_low(PIN_C0);
enable_interrupts(INT_EXT);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
while(TRUE)
{
switch (status)
{
case (1):
if (answer = 'A')//if user pressed A, read voltage off cell
{
set_adc_channel(1);//channel RA1 for cal photo cell
delay_cycles(60);
address = 00;
value = read_adc(); //reads the adc at a set lux level
delay_ms(4);
write_eeprom(address, make8(value,0)); //enter first 8 bits
write_eeprom(address+1, make8(value,1)); //enter next 8 bits in next memory location
printf("\r\n*****\n\r");
delay_ms(10);
//printf("Bytes = %lu\n\r", value);//for debugging
//delay_ms(100);
photo2 = ((float)value/1024)*5;//conversion
printf("Voltage = %1.3f\n\r", photo2);//prints the voltage in float
printf("Calibration\n\r");
delay_ms(5);
printf("complete\n\r");
for(p=0;p<11;p++)//allow user to switch power plug
{delay_ms(1000);
printf("\r\n%lx\n\r",p);
}
status=2;//go to reading voltage off cal cell
}
else{
status=2;//if char not = A, go to setting light level
}
break;
case (2): *(&saved) = read_eeprom(address); //gets lsb
*(&saved+1) = read_eeprom(address+1); //gets msb
set_adc_channel(1);
saved2=((float)saved/1024)*5;//convert save hex to voltage
printf("\r\nsaved=%f\n\r",saved2);
status=3;//go to controlling light and reading voltage
break;
case (3): if(zero_cross_flag==1){//wait for zero cross
//intcounter++;
set_timer1(trigger_delay); //initially 44688 (4.16mS)
SET_ADC_CHANNEL(1);
delay_cycles(30); // wait
valuea=read_adc(); //get value
//delay_us(100);
voltage=((float)valuea/1024)*5;
// printf("\r\n%f\n\r",valuea);
if((voltage<=(saved2-0.02))&& (trigger_delay<62000>=(saved2+0.02))&&(trigger_delay>=24000))
trigger_delay=trigger_delay-3;
if((voltage>=(saved2-0.005))&&(voltage<=(saved2+0.005)))
{light_toggle=0;//indicates light level is correct
if(light_set!=0)
{printf("\r\n%f\n\r",voltage);
light_set=0;
}
else
light_set=0;
}
else
light_toggle=1;
delay_cycles(60); // wait
//printf("\r\nt=%lu\n\r",trigger_delay);
//printf("\r\nv=%f\n\r",voltage);
zero_cross_flag=0;
break;}break;}
}
}
reset_cpu();
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Sep 26, 2006 3:51 pm |
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| Quote: |
I am trying to use the kbhit to determine if a char has been received on
the serial port. If one has not, then it should timeout after 5 sec and
continue to status 2.
But what I am seeing now if that it will always timeout.
|
In the posted code, the timed_getc() function is never called.
Also, you don't show your #use rs232() statement, and other CCS
directives (#fuses, etc.). |
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mojo
Joined: 26 Sep 2006
Posts: 2
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| Posted: Wed Sep 27, 2006 6:33 am |
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Here is my .h file
[code]#include <16F877A.h>
#device *=16
#device adc=10
#org 0x1F00, 0x1FFF void loader16F876(void) {} //protect bootloader code for the 8k 16F876/7
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz)
#FUSES PUT //Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#use fixed_io(c_outputs=Pin_C0, PIN_C1)
In order to call the timed_getc(), should i use a different vairble say b (which is a char) and use b = timed_getc() in the main do an if else, if b = 'A' go to status 1 and else go to status 2??
Thanks for your help. |
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