Seems simple, don't get it
Beavis3215
Posts: 229
in Propeller 1
void button_time()
{
set_directions(13,8,0b111111);
int t = 20;
while(1)
{
int advance = input(15); // advance shortens magnet off delay
int retard = input(14); // retard lengthens magnet off delay
if (retard == 1)
{
t = t + 1;
pause(300);
if (t > 64) // Don't allow t to exceed 63
{
t = 64;
}
}
if (advance == 1)
{
t = t - 1;
pause(300);
if (t < 1) // Keep t 0 or larger
{
t = 1;
}
}
delay = t; // Pass delay to main function
set_outputs(13,8,t); // Put t value on output lights
}
}
I'm trying to vary t between 0 and 63 using 2 pushbuttons, and displaying them on 6 leds. If I use
If (t > 63)
{
t = 63;
}
and
if (t < 0)
{
t = 0;
}
the program jumps off the deep end on zero, and on 63 goes back to 62 after a half second.
I really seems like this should work, but does not.
The main program in cog 0 uses delay as pause(delay);
button_time runs in another cog
I the present form of the code, I get 1 to 63.
Why are my results different than I expect?
What code should I use?
Comments
if (t < 1) // Keep t 0 or larger { t = 1; }doesn't agree with the comment, essentially if "t" is zero, it is changed to 1.
In your wiring are pins 14 and 15 pulled to low, or are they floating?
Tom
using my code above 1 to 63 is all I can attain for now.
if (t > 63) { t = 63; } if (t < 0) { t = 0; }looks like it should work, but does not.
pins 14 and 15 are pulled low
./* Figit Spinner Motor Pin 19 is on sensor input Pin 18 is off sensor input Pin 17 is magnet controller output Pin 16 is timing light output Pin 15 is timing advance input Pin 14 is timing retard input Pin 13-8 is binary timing output */ #include "simpletools.h" // Include simple tools void button_time(); static volatile int delay; // delay is global int main() // Main function { cog_run(button_time,128); // Push button control runs in other cog set_directions(17,16,11); while(1) { int on_sensor = input(19); int off_sensor = input(18); if (on_sensor == 1) { set_output(17,1); // Turn magnet on } if (off_sensor == 1) { pause(delay); // Delay is assigned in button_time set_output(17,0); // Turn magnet off set_output(16,1); // Timing light on pause(5); set_output(16,0); // Timing light off } } }This is the main program
You can also do this in one line:
-Phil
Don't think you can do that in C
-Phil
if (i && !--i){ // if not zero but now reached zero for exampleyou could do:
in C, if statements are always break at first false it encounter
void pause(int time) // pause function definition { time *= st_pauseTicks; // Calculate system clock ticks waitcnt(time+CNT); // Wait for system clock target }st_pauseTicks should be set to the number of ticks in a millisecond. When you pass a value of zero to the pause function it will execute a waitcnt(0+CNT). This causes the main program to wait until CNT wraps all the way back to its initial value. At 80 MHz that takes about 54 seconds. You can allow delay to go to zero, but don't call the pause function when its zero.I'm not sure what the problem is with 63. It seems like that should work fine.