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dc stepper motor

Associate II

I am attempting to control the speed of a DC stepper motor using an Infineon TLE8444SL motor driver. The four outputs of the driver are connected to the motor, with inputs 1 and 2 shorted and connected to pin Pa1, and inputs 3 and 4 shorted and connected to pin pa5 of the nucleo f401. I have successfully achieved motor rotation in both clockwise and counterclockwise directions. What steps should I take to control the motor speed through PWM, and which pin should I configure for PWM?