The following sample program illustrates the basic speed control function and dynamic braking with the SPice10213. It drives the motor 1 (reversible) output.
;MDrv1 SPice10213 simple speed control example ;This program illustrates simple speed control ;and dynamic braking of a small DC motor using the SPice10213 ;on an MS12 controller. It has a forward/reverse button and a stop/start button. ;Forward/reverse is active only while the motor is stopped. ;Stop/starts initial starts the speed ramping up. Once running, ;it triggers a sudden stop. ;The motor will be started at an initial PWM setting. This will be a function of ;the motor ... below some threshold it doesn't rotate at all. InitialPWM EQU 50 ;The motor will ramp up to the PWM value MaxPWM MaxPWM EQU 200 iStopStart iEQU 16 ;The Stop/Start button iFwdRev iEQU 14 ;The Forward/Reverse button oDirection oEQU 12 ;The direction relay ;------- RAM allocation ------------------ PWM mEQU 0 ;------ ;Start of program setu 0,1 ;set spice connector pin 4 as DO setu 4,4 ;set spice connector pin 8 as PWM output SpiceConfigU Idle: ;Back here when motor is stopped ResetK :clear any pending buttons IdleLoop: ;Sit and wait for a button (command) GoIfInK iStopStart,StartUp ;Test for start command InputK iFwdRev ;Test for reversal GoIfF IdleLoop InputO oDirection ;Reverse the direction relay NOT Output oDirection GoTo IdleLoop ;Here to start the motor StartUp: LoadX InitialPWM ;Initial speed RampLoop: Push ;Duplicate GoIfXEQ MaxPWM,Running ;Test if at max speed IncX ;Increment the speed value Push ;Duplicate AnOutJ ;Update motor drive GoIfInK iStopStart,Stop ;Test for stop Pause 2 ;20mS delay GoTo RampLoop Running: ;Here when running at max speed WaitOnK iStopStart ;Wait for stop command Stop: LoadX 0 AnOutJ ;Turn off PWM output InputO oDirection ;Reverse the direction relay .. NOT ; .. for ... Output oDirection ;... dynamic braking Pause 10 ;Time for motor to stop InputO oDirection ;Restore the direction relay NOT Output oDirection GoTo Idle