About dsPIC33 programming in C

[Rahul]

Hello all,

 

Can cany one help me how can I start learning dsPIC programming easily? I am beginner in this field. I have to write a program for wireless transmission.

 

Thank you

 

 

 

[Amrith]

Hi Rahul,

 

Buy an PIC arduino development board, if you are a beginner then start coding for basic applications such as blinking leds through i/o pins.

[Rahul]

Hello everyone,

 

Can anyone help me how can we implement RF remotecontrol 8 channel receiver interface with PPM.

 

Thank you

[AJISH ALFRED]

 

Hi Rahul,

 

Do you already have the RF remote control and 8 channel receiver with you ? 

There are different types available. Please share the part number or link to its datasheet, so that it would be easy for someone who can could help you.

[Rahul]

Hello AJISH ALFRED,

 

I already bought 8 channel receiver its from Graupner “SMC 16 SCAN 35”. working at 35 Mhz. I am using the microcontroller of PIC33 family.

[Rahul]

hello all,

 

I have a code whic i think everything is ok but while compiling it gives many errors…can any one help me to debug it. I have this for measurinf pulse width of PPM signal received by 8 channel receiver.

 

 

# define PPM_Number_of_Channels 8

int failSafePulses = 0;

int PPM_IN[input+1];                // Pulse Width of input signal

unsigned int rise[input+1] ; //rising edge clock

unsigned char ch; //PPM channel counter

unsigned int fall; // Record PPM fall time

Boolean framok; // Are all measurement ok

 

#define PPM_FAILSAFE_INPUT_MIN 1500

#define PPM_ADJUST 1000

 

void capture_int(void)

 

{

T2CON = 0b1000000000000000  ; // turn on timer 2 with no prescaler

TRISD = 0b1111111111111111 ; // make the d port input, to enable IC1 and IC2

TRISFbits.TRISF6 = 1 ; // make F6 an input to enable the 3rd switch

IC1CON = IC2CON = IC7CON = IC8CON = 0b0010000010000001 ; //IMC<2:0> = 001 (Capture every rising and falling edge)

 

IPC0bits.IC1IP = IPC1bits.IC2IP = IPC4bits.IC7IP = IPC4bits.IC8IP = 6 ; // priority 6

IFS0bits.IC1IF = IFS0bits.IC2IF = IFS1bits.IC7IF = IFS1bits.IC8IF = 0 ; // clear the interrupt

 

IEC1bits.IC7IE = 1 ; // turn on interrupt for input 1

 

return ;

}

 

void __attribute__((__interrupt__,__no_auto_psv__)) _IC7Interrupt(void)

{

unsigned int time ;

unsigned int pulse;

 

IFS1bits.IC7IF = 0 ; // clear the interrupt

while ( IC7CONbits.ICBNE )

{

time = IC7BUF ;

}

 

#if ( NORADIO == 0 )

if (!PORTBbits.RB4) //first change!

{

fall = time ;

}

else

{

pulse = ((time – fall ) >> 1 )+ PPM_ADJUST ;

 

if (pulse > 10000) //sync pulse

{

ch = 1;

frameOK = true;

}

else

{

 

PPM_IN[ch] = pulse;

 

if (ch < PPM_NUMBER_OF_CHANNELS + 1 ) 

ch++; //scan next channel

else 

{

if(frameOK == false)

{

failSafePulses = 0 ;

flags._.radio_on = 0 ;

LED_GREEN = LED_OFF ;

}

 

if( (PPM_IN[FAILSAFE_INPUT_CHANNEL] > FAILSAFE_INPUT_MIN) && (PPM_IN[FAILSAFE_INPUT_CHANNEL] < FAILSAFE_INPUT_MAX ) )

failSafePulses++ ;

 

ch = 1;

frameOK = true;

}

 

if ( (pulse < PPM_FAILSAFE_INPUT_MIN ) )

{

frameOK = false;

}

}

}

#endif

}

 

 

 

thank you

Rahul

[AJISH ALFRED]

Hi Rahul,

Please tell us more about your project.

Also make the following things clear,

 

Which is the controller you are using?

What exactly should the above code meant to do?

Which all errors are you getting?

The IDE you are using?

 

Also kindly post the code again, this time properly commented, line by line, block by block.

Also give us an idea about your hardware connections.

[Author]

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