Software PWM module

Implements 8channels(max) 10bits 100Hz(max) software PWM. More...

Implements 8channels(max) 10bits 100Hz(max) software PWM.

Example : main.c

/*********************************************************************
 *               analog example for Versa1.0
 *  Analog capture on connectors K1, K2, K3 and K5. 
 *********************************************************************/
 
#define BOARD Versa1
 
#include <fruit.h>
#include <softpwm.h>
 
t_delay mainDelay;
 
void setup(void) {  
//----------- Setup ----------------
    fruitInit();
            
    pinModeDigitalOut(LED);     // set the LED pin mode to digital out
    digitalClear(LED);      // clear the LED
    delayStart(mainDelay, 5000);    // init the mainDelay to 5 ms
 
//----------- softpwm setup ----------------
    softpwmInit();      // init softpwm module
}
 
// ---------- Main loop ------------
void loop() {
    fraiseService();    // listen to Fraise events
}
 
// ---------- Interrupts ------------
void highInterrupts()
{
    softpwmHighInterrupt();
}
void lowInterrupts()
{
    softpwmLowInterrupt();
}
 
// Receiving
 
void fraiseReceive() // receive raw bytes
{
    unsigned char c=fraiseGetChar();
    if(c==50) softpwmReceive(); // if first byte is 50, then call softpwm receive function.
}
 

config.h

#ifndef _CONFIG_H_
#define _CONFIG_H_
 
#define SOFTPWM0 LED
#define SOFTPWM1 K1
#define SOFTPWM2 K2
#define SOFTPWM3 K3
#define SOFTPWM4 K4
 
#define SOFTPWM_TICK_US 6
//#define SOFTPWM_MAX_VALUE 1023
//#define SOFTPWM_INTPRI 1
 
#endif // _CONFIG_H_
 

Settings to put in config.h
Define in config.h the wanted pins: #define SOFTPWM0 K1 (replace K1 by the pin you want for softpwm channel 0) #define SOFTPWM1 K2 (replace K2 by the pin you want for softpwm channel 1) (...) The following parameters can be overloaded:
#define	SOFTPWM_TIMER
	Timer to be used by the softpwm module (only 1, 3 or 5 ; default: 5).
#define	SOFTPWM_MAX_VALUE
	default 1023.
#define	SOFTPWM_TICK_US
	default 5 ; PWM frequency will be 1 / (SOFTPWM_MAX_VALUE * SOFTPWM_TICK_US)
#define	SOFTPWM_INTPRI
	default 1 (high priority).

Initialization
void	softpwmInit ()
	Init the module in setup()

Utilities
void	softpwmSet (unsigned char chan, unsigned int val)
	Set the value of a channel.
unsigned int	softpwmGet (unsigned char chan)
	Get the current value of a channel.

Interrupt routine
void	softpwmHighInterrupt (void)
	Module high interrupt routine, must be called by the highInterrupts() user defined function.
void	softpwmLowInterrupt (void)
	Module low interrupt routine, must be called by the lowInterrupts() user defined function.

Receive function
void	softpwmReceive ()
	Module receive function, to be called by the fraiseReceive() user defined function. More...

Function Documentation

softpwmReceive()

void softpwmReceive

(

)

Module receive function, to be called by the fraiseReceive() user defined function.

The first byte of the message represents the channel (0-7), the 2 next bytes are the 16 bit new pwm value.