完善后的程序如下所示:
void config_pwm(void) {
// set I/O function to TA2.1
P5->SEL0 |= BIT6;
P5->SEL1 &= ~BIT6;
P5->DIR |= BIT6;
// set I/O function to TA0.1
P2->SEL0 |= BIT4;
P2->SEL1 &= ~BIT4;
P2->DIR |= BIT4;
// set I/O function to TA0.3
P2->SEL0 |= BIT6;
P2->SEL1 &= ~BIT6;
P2->DIR |= BIT6;
// buzzer
P2->SEL0 |= BIT7;
P2->SEL1 &= ~BIT7;
P2->DIR |= BIT7;
// Use SMCLK (24MHz) divided by 4 as clock source for the timer
TIMER_A2->CTL = TIMER_A_CTL_SSEL__SMCLK | TIMER_A_CTL_ID__4 | TIMER_A_CTL_MC__UP;
TIMER_A0->CTL = TIMER_A_CTL_SSEL__SMCLK | TIMER_A_CTL_ID__4 | TIMER_A_CTL_MC__UP;
// Set TAxCCR0 the value for PWM period
TIMER_A2->CCR[0] = 7500; // Adjust this value as per your requirements
TIMER_A0->CCR[0] = 7500; // Adjust this value as per your requirements
// Set TAxCCR1, TAxCCR3 and TAxCCR[1] the value for active time and set output mode in 7 (PWM)
TIMER_A2->CCR[1] = TIMER_A2->CCR[3] = (TIMER_A2->CCR[0]) >> 2;
TIMER_A2->CCTL[1] |= TIMER_A_CCTLN_OUTMOD_7;
TIMER_A2->CCTL[3] |= TIMER_A_CCTLN_OUTMOD_7;
TIMER_A0->CCR[1] = (TIMER_A0->CCR[0]) >> 2;
TIMER_A0->CCTL[1] |= TIMER_A_CCTLN_OUTMOD_7;
// Enable the overflow interrupt
TIMER_A2->CTL &= ~TIMER_A_CTL_IFG;
NVIC_EnableIRQ(TA2_N_IRQn);
TIMER_A2->CTL |= TIMER_A_CTL_IE;
// Enable the overflow interrupt
TIMER_A0->CTL &= ~TIMER_A_CTL_IFG;
NVIC_EnableIRQ(TA0_N_IRQn);
TIMER_A0->CTL |= TIMER_A_CTL_IE;
}
这段代码配置了 MSP432 微控制器的 TimerA2 和 TimerA0 定时器以及相应引脚,实现了 PWM 的功能。具体的配置包括:
- 设置 P5.6、P2.4 和 P2.6 引脚为定时器功能模式。
- 设置 P2.7 引脚为蜂鸣器输出。
- 使用 SMCLK(24MHz)除以 4 作为定时器的时钟源。
- 将定时器模式设置为向上计数模式。
- 设置 TAxCCR0 寄存器的值作为 PWM 周期。
- 设置 TAxCCR1、TAxCCR3 和 TAxCCR[1] 寄存器的值作为活动时间,并将输出模式设置为 PWM 模式。
- 启用定时器的溢出中断,并使能相应的中断请求。
- 最后,函数通过
NVIC_EnableIRQ()
函数启用了相应定时器的中断。
请注意,这段代码仅提供了配置 PWM 的基本步骤和示例。根据具体需求,你可能需要调整一些参数和引脚配置以实现期望的功能。
内容由零声教学AI助手提供,问题来源于学员提问