Question

pic单片机编程，求高手帮助指点!!

我要用pic16f877a型号的单片机，用C语言编程，想用这个单片机ccp1和ccp2两个引脚的pwm调速功能，要能使直流电机正反转，还要能加减速。请问程序应该怎么编，需要用到ccp1con寄存器以外，还需要用到什么别的寄存器？求帮忙帮我讲讲，最后能给我一个示例程序看看

Answer 1

请耐心读datasheet不然不会提高的。请看

The following steps should be taken when configuring
the CCP module for PWM operation:
1. Set the PWM period by writing to the PR2 register.
2. Set the PWM duty cycle by writing to the
CCPR1L register and CCP1CON<5:4> bits.
3. Make the CCP1 pin an output by clearing the
TRISC<2> bit.
4. Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
5. Configure the CCP1 module for PWM operation.
所以要设置PR2配置PWM周期。然后写入duty cycle。
用到的一些寄存器例如tris里面设置端口为输出，然后配置timer2相关寄存器。最后配置pwm的ccp1con。控制电机的时候只需要修改duty cycle 即可。