Polaroid Ultrasonic Sensor

[Trefor]

Has anybody come accross any CCS C code for driving the Polaroid ultrasonic 6500 ranging board? Any help with this will be much appreciated.
Trefor
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This message was ported from CCS's old forum
Original Post ID: 12485

[Paladdin]

:=Has anybody come accross any CCS C code for driving the Polaroid ultrasonic 6500 ranging board? Any help with this will be much appreciated.
:=Trefor

Sure, but it was long ago... Programming style is rude, although enough to catch the point. Use it at your own risk :)

echo_time array returns up to four consecutive echo responses from the receiver, for multitarget measurements.

Good luck!

Paladdin

<pre>
/*************************************************************************/
/* RANGING.C */
/*************************************************************************/

#include <16C63A.H>

#define ECHO PIN_C2
#define INIT PIN_A1
#define BLNK PIN_A0

#define START_MSG '#'
#define END_MSG '*'
#define MY_ID 'A'

#use fast_io(A)
#use delay(clock=4000000)
#use rs232(baud=1200,xmit=PIN_C6,rcv=PIN_C7,brgh1ok)

void check_range(void) ;
void isr_rda(void) ;
void isr_ccp1(void) ;
void csum_gen(char *s) ;

short flag = FALSE ;
long echo_time[4] ;
byte echo_counter ;
byte data_in[3] ;

#int_rda
void isr_rda(void)
{
data_in[2] = data_in[1] ; //Buffer 'rotativo'
data_in[1] = data_in[0] ;
data_in[0] = getc() ;

if(data_in[2] == START_MSG) //Si es para mi, reacciona
if(data_in[0] == END_MSG)
if(data_in[1] == MY_ID)
flag = TRUE ;
}


#int_ccp1
void isr_ccp1(void)
{
echo_time[echo_counter++] = CCP_1 ;
if(echo_counter > 4)
echo_counter = 3 ;
output_high(BLNK) ;
delay_us(440) ;
output_low(BLNK) ;
}

void check_range(void)
{
byte c = 0 ;
echo_counter = 0 ;

do
{
set_timer1(0) ;
output_high(INIT) ;
delay_ms(199) ;
output_low(INIT) ;
delay_ms(100) ;
} while((c++ < 5) && (echo_time[1] == 0)) ;
printf("#\%lu,\%lu,\%lu,\%lu,\%i*\r\n", echo_time[0],echo_time[1],
echo_time[2],echo_time[3], c) ;
for(c = 0; c < 4; c++)
echo_time[c] = 0 ;
}

void main(void)
{
byte c ;

set_tris_a(0x00) ;

for(c = 0; c < 4; c++)
echo_time[c] = 0 ; // Variable init
data_in[0] = '\0' ;

setup_ccp1(CCP_CAPTURE_RE) ; // Configure CCP1 to capture rise
setup_timer_1(T1_INTERNAL) ; // Start timer 1

enable_interrupts(INT_RDA) ;
enable_interrupts(INT_CCP1) ;
enable_interrupts(GLOBAL) ;

output_low(INIT) ; //Assure correct power-up
output_low(BLNK) ;
delay_ms(100) ;

while(TRUE)
if(flag)
{
flag = FALSE ;
check_range() ;
}
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 12488

[Chromeboy]

[Chromeboy]

Hi Trefor, I'm very sorry, my email is NOT fairchild@hotmail.com, it is superfairchild@hotmail.com, so if you want to contact me to tell you everything I know.

Ciao.