eddieprice19
Member
I have been using MPLAB to write code in asm to control the speed and direction of a small electric motor. I wish to use 4 buttons for forward, reverse, halt and emergency stop. There is a wireless link between the hand held controller and the motor. I have produced code to generate a pwm signal for the motor, which works, but my problem is that I need to detect when a button has been pressed. In other words I need to use an interrupt, but am not really sure how to use the interrupt.
The program is likely to spend most of its time in the pwm sub-routine. An interrupt will jump me into the ISR, but what should I do when I get there, and how do I cancel the pwm sub-routine RETURN. In the ISR I assume I need to check which button has been pressed, but what about that sub-routine RETURN. How do I get rid of that.
I have been using a 16F630. Should I use something like a 16F785 which contains a pwm generator, and so avoid the need to write pwm code.
Thanks in advance for any help.
Eddie Price
The program is likely to spend most of its time in the pwm sub-routine. An interrupt will jump me into the ISR, but what should I do when I get there, and how do I cancel the pwm sub-routine RETURN. In the ISR I assume I need to check which button has been pressed, but what about that sub-routine RETURN. How do I get rid of that.
I have been using a 16F630. Should I use something like a 16F785 which contains a pwm generator, and so avoid the need to write pwm code.
Thanks in advance for any help.
Eddie Price