Share 'Brushless and ESC help'

I’m using a BP brushless motor and BP ESC with a 3S Lipo battery, and I use a microprocessor to generate a PWM signal (1ms – 2ms rate) for the ESC(with a BEC). The PWM generates 100% duty for the ESC, but the motor sometimes spins, and sometimese doesn’t spin at all. The motor spins 7 out of 10 times. I have tried to switch the motor cables (3 wires) to connect to the different ESC outputs, I cou…