MSP实时输出占空比可调的pwm波形 -

// 占空比可调的PWM, 我没试过, 手里没单片机, 只是记下.

本文引用地址: http://www.21ic.com/app/mcu/201808/781830.htm

#include

void main(void)

{

volatile unsigned int i;

WDTCTL = WDTPW + WDTHOLD; // Stop WDT

BCSCTL1 |= XTS; // ACLK= LFXT1 = HF XTAL

do {

IFG1 &= ~OFIFG; // Clear OSCFault flag

for (i = 0xFF; i > 0; i--) { // Time for flag to set

;

}

} while ((IFG1 & OFIFG)); // OSCFault flag still set?

BCSCTL2 |= SELM_3; // MCLK= LFXT1 (safe)

P4DIR |= 0x06; // P4.1 and P4.2 output

P4SEL |= 0x06; // P4.2 and P4.2 TB1/2 otions

TBCCR0 = 128; // PWM Period/2

TBCCTL1 = OUTMOD_6; // CCR1 toggle/set

TBCCR1 = 32; // CCR1 PWM duty cycle

TBCCTL2 = OUTMOD_6; // CCR2 toggle/set

TBCCR2 = 96; // CCR2 PWM duty cycle

TBCTL = TBSSEL_1 + MC_3; // ACLK, up-down mode

_BIS_SR(CPUOFF); // Enter LPM0

}