bit 7 Unimplemented: Read as ‘0’
bit 6-4 IRCF<2:0>: Internal Oscillator Frequency Select bits
111 = 8MHz
110 = 4 MHz (default)
101 = 2MHz
100 = 1MHz
011 = 500kHz
010 = 250kHz
001 = 125kHz
000 = 31 kHz (LFINTOSC)
bit 3 OSTS: Oscillator Start-up Time-out Status bit(1)
1 = Device is running from the external clock defined by FOSC<2:0> of the Configuration Word register
0 = Device is running from the internal oscillator (HFINTOSC or LFINTOSC)
bit 2 HTS: HFINTOSC Status bit (High Frequency – 8 MHz to 125 kHz)
1 = HFINTOSC is stable
0 = HFINTOSC is not stable
bit 1 LTS: LFINTOSC Stable bit (Low Frequency – 31 kHz)
1 = LFINTOSC is stable
0 = LFINTOSC is not stable
bit 0 SCS: System Clock Select bit
1 = Internal oscillator is used for system clock
0 = Clock source defined by FOSC<2:0> of the Configuration Word register

quote:

ORIGINAL: COM


Hi Rob,

0b tell the compiler the the number is binary and the rest of that line is in the datasheet.


01100111 The upper nibble selects the osc speed the lower nibble selects rc osc and a few other things.

quote:



void main()
{

const char tspark[]={ 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, 11, 12, 13, 13, 14, 15, 15, 16, 16, 17, 18, 18, 19, 19, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 31, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 38, 39, 39, 40, 40, 41, 41, 42, 42, 43, 43, 43, 44, 44, 45, 45, 46, 46, 46, 47, 47, 48, 48, 49, 49, 49, 50, 50, 50, 51, 51, 52, 52, 52, 53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 58, 58, 58, 59, 59, 59, 60, 60, 60, 60, 61, 61, 61, 62, 62, 62, 62, 63, 63, 63, 63, 64,
64, 64, 65, 65, 63, 63, 64, 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 68, 69, 69, 70, 70, 71, 71, 71, 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 76, 77, 77, 78, 78, 79, 79, 80, 80, 80, 81, 81, 82, 82, 83, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87, 87, 88, 88, 89, 89, 90, 90, 91, 91, 92, 92, 92, 93, 93, 94, 94, 95, 95, 96, 96, 96, 97, 97, 98, 98, 99, 99, 100, 100, 100, 101, 101, 102, 102, 103, 103, 104, 104, 104, 105, 105, 106, 106, 107, 107, 107, 108, 108, 109, 109, 110, 110, 111, 111, 112, 112, 112, 113, 113};

char tspk,spark, t0;
OSCCON = 0b01100111; // internal OSC set to 4MHZ
ANSEL = 0; // Disable Analog channels
CMCON0 = 0x07; // Disable Comparitors
TRISIO = 0x0C; // set GPIO1 for input, all others for output
GPIO = 0x00; // set output to SCR low
OPTION_REG = 0x07; // set to 07=256 RE - tmr0 SOURCE INT CLOCK, 06=1:128 PRESCALER
TMR2 = 0;
PR2 = 255;
T2CON = 0x07; // start TMR2 counter 1:16
INTCON = 0; // clear INTCON


// Following table is based on 360 degree timing arc & 40 deg starting arc (South pole of magnet triggers Hall switch)
// table based on a polynomial and limits the min delay to 15 TMR2 cycles
// the spark flag is a one shot to prevent continuous sparking on a Hall low signal

while(1) // loop forever
{
while( GPIO.F2 ^ 1) // wait for high pulse on Hall switch

{
spark = 1;
} // North pole of magnet has passed
while(spark)
{
t0 = TMR0;
TMR0 = 0; // start new rev count
if(INTCON&4) tspk=255; // <<<< ADD THIS LINE TO YOUR CODE!!! 917> RPM 255x16uS=4,080mS
else tspk = tspark[t0]; // use table lookup for spark delay
T2CON = 0x07; // start TMR2 counter 1:16
TMR2= 0; // clear spark timer
while(TMR2 < tspk); // loop until timeout to send spark
GPIO ^= 0x30; // take ground off the SCR Pin GPIO4 and 6
delay_us(50); // 23 us delay
GPIO ^= 0x30; // sends a ground to the SCR gate
spark = 0;
INTCON = 0; // clear INTCON
} // end while spark loop
} // end loop forever
} // end of program

////Notes
//
// ; At a engine speed of 1200 RPM;
// ;
// ; 1200 / 60 = 20 revs per second
// ; 1 / 20 = 50mS per rev
// ; 1 rev = 360 degrees
// ;
// ; 36 degrees at 1200 RPM = (36 / 360) X 50 = 5mS
// ;
// ; 100uS loop time
// ; 4MHz clock / 4 = 1MHz instruction cycle
// ; cycle time = 1/1MHz = 100uS
// ; 100uS/100uS = 100 cycles
// ; prescaler set to divide by 4
// ; preset TMR0 = 231, when = 0 = 100uS
// ; 231 to 255 = 25 x 4(prescaler) = 100


// -O-
// VDD o o RA GND
// SCR RA5 o o RA0
// Strobelight RA4 o o RA1
// MCLR RA3 o o RA2 Hall input
//

quote:

ORIGINAL: Evert1969

Who can tell me wat's wrong?

quote:

ORIGINAL: COM

Evert1969

Why not just buy a pic programmer.The don't cost that much.