Jon Hazan
This is a Library I have created for a Project, the aim being to send the shutter release trigger signal to my Nikon D40x DSLR using an IR led. The code defaults to a 38.4KHz oscilation but can be set to any frequency.
Revision 0:083159111741, committed 2010-12-01
- Comitter:
- hazanjon
- Date:
- Wed Dec 01 00:36:04 2010 +0000
- Commit message:
- Beta
Changed in this revision
| Pulse.cpp | Show annotated file Show diff for this revision Revisions of this file |
| Pulse.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Pulse.cpp Wed Dec 01 00:36:04 2010 +0000
@@ -0,0 +1,50 @@
+
+#include "Pulse.h"
+#include "mbed.h"
+
+ Pulse::Pulse(PinName pin) : output_pin(pin) {
+ output_pin = 0;
+ switch_state = false;
+ oscilation = 38400; //Set default oscilation to 38.4KHz
+ }
+
+ void Pulse::send_pulse(int* sequence){
+ int num_switches = (sizeof(sequence)/sizeof(int));
+ int tick = 1000000/oscilation;
+ for(int i = 0; i < num_switches; i++){
+ if(i % 2 == 0){
+ change_state();
+ output_pin = 1;
+ flipper.attach_us(this, &Pulse::flip_pin, tick);
+ wait_us(sequence[i]);
+ flipper.detach();
+ change_state();
+ output_pin = 0;
+ }else{
+ wait_us(sequence[i]);
+ }
+ }
+ }
+
+ void Pulse::set_osc(int khz){
+ if(khz > 0 && khz <= 250000) //Make sure that the new oscilation is positive and also less than 250KHz
+ oscilation = khz;
+ }
+
+ void Pulse::set_pin(PinName pin){
+ output_pin = pin;
+ }
+
+ void Pulse::flip_pin(){
+ if(switch_state) //Stop the output from switching unless it is meant to be transmitting
+ output_pin = !output_pin;
+ else
+ output_pin = 0;
+ }
+
+ void Pulse::change_state(){
+ switch_state = !switch_state;
+ }
+
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Pulse.h Wed Dec 01 00:36:04 2010 +0000
@@ -0,0 +1,25 @@
+#ifndef MBED_PULSE_H
+#define MBED_PULSE_H
+
+#include "mbed.h"
+
+class Pulse {
+public:
+ Pulse(PinName pin);
+
+ void send_pulse(int* sequence);
+ void set_osc(int hz);
+ void set_pin(PinName pin);
+
+private:
+ DigitalOut output_pin;
+ int oscilation;
+ bool switch_state;
+ Ticker flipper;
+
+ void flip_pin();
+ void change_state();
+};
+
+
+#endif