MSP432P401R增减计数模式固定占空比PWM输出

黄福均 · 发表于 2021-6-4 11:59:34

本帖最后由黄福均于 2021-6-5 00:45 编辑

/*******************************************************************************
* MSP432 Timer_A - 4路 PWM 输出
* 在P2.4 ,P2.5 ,P2.6 ,P2.7 引脚输出四路PWM
* 此程序只是测试PWM能否输出，在程序运行中PWM占空比不可变
* 可以在开始的宏定义中修改周期值和占空比。
* Timer_A TA0.1--PWM1 , TA0.2--PWM2 , TA0.3--PWM3 , TA0.4--PWM4
* SMCLK = MCLK = TACLK = default DCO 3MHz
* DUTY_CYCLE1的值越小，高电平时间越长，占空比越高。
*             MSP432P401
*          ------------------
*       /|\|                |
*       | |                |
*       --|RST             |
*          |                |
*          |                |
*          |          P2.4  |--> Output PWM左前
*          |          P2.5  |--> Output PWM右前
*          |          P2.6  |--> Output PWM左后
*          |          P2.7  |--> Output PWM右后
*******************************************************************************/
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>

/* Application Defines */
#define TIMER_PERIOD 128
#define DUTY_CYCLE1 32
#define DUTY_CYCLE2 32
#define DUTY_CYCLE3 32
#define DUTY_CYCLE4 32

/* Timer_A UpDown Configuration Parameter */ //定时器A增减计数模式参数配置
const Timer_A_UpDownModeConfig upDownConfig =
{
      TIMER_A_CLOCKSOURCE_SMCLK,             // SMCLK Clock SOurce
      TIMER_A_CLOCKSOURCE_DIVIDER_1,       // SMCLK/1 = 3MHz
      TIMER_PERIOD,                         // 127 tick period       计数周期点数为127
      TIMER_A_TAIE_INTERRUPT_DISABLE,       // Disable Timer interrupt
      TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE, // Disable CCR0 interrupt
      TIMER_A_DO_CLEAR                      // Clear value

};

/* Timer_A Compare Configuration Parameter  (PWM1) */ //TA0.1--PWM1参数配置
const Timer_A_CompareModeConfig compareConfig_PWM1 =
{
      TIMER_A_CAPTURECOMPARE_REGISTER_1,       // Use CCR1
      TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE, // Disable CCR interrupt
      TIMER_A_OUTPUTMODE_TOGGLE_SET,             // 计数值未到DUTY_CYCLE1时为低电平，计数值到了DUTY_CYCLE1后为高电平
      DUTY_CYCLE1                               // 32 Duty Cycle
};

/* Timer_A Compare Configuration Parameter (PWM2) */ //TA0.2--PWM2参数配置
const Timer_A_CompareModeConfig compareConfig_PWM2 =
{
      TIMER_A_CAPTURECOMPARE_REGISTER_2,       // Use CCR2
      TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE, // Disable CCR interrupt
      TIMER_A_OUTPUTMODE_TOGGLE_SET,             // Toggle output but
      DUTY_CYCLE2                               // 32 Duty Cycle
};

/* Timer_A Compare Configuration Parameter (PWM3) */ //TA0.3--PWM3参数配置
const Timer_A_CompareModeConfig compareConfig_PWM3 =
{
      TIMER_A_CAPTURECOMPARE_REGISTER_3,       // Use CCR3
      TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE, // Disable CCR interrupt
      TIMER_A_OUTPUTMODE_TOGGLE_SET,             // Toggle output but
      DUTY_CYCLE3                               // 32 Duty Cycle
};

/* Timer_A Compare Configuration Parameter (PWM4) */ //TA0.4--PWM4参数配置
const Timer_A_CompareModeConfig compareConfig_PWM4 =
{
      TIMER_A_CAPTURECOMPARE_REGISTER_4,       // Use CCR4
      TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE, // Disable CCR interrupt
      TIMER_A_OUTPUTMODE_TOGGLE_SET,             // Toggle output but
      DUTY_CYCLE4                               // 32 Duty Cycle
};

int main(void)
{
/* Stop WDT  */
MAP_WDT_A_holdTimer();

MAP_GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN6 + GPIO_PIN7);
MAP_GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN3);
MAP_GPIO_setAsOutputPin(GPIO_PORT_P3, GPIO_PIN0);
MAP_GPIO_setAsOutputPin(GPIO_PORT_P5, GPIO_PIN6 + GPIO_PIN7);
MAP_GPIO_setAsOutputPin(GPIO_PORT_P6, GPIO_PIN6 + GPIO_PIN7);

MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P6, GPIO_PIN7);
MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P5, GPIO_PIN6);
MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN6);
MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P3, GPIO_PIN0);

MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P2, GPIO_PIN3);
MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P6, GPIO_PIN6);
MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P1, GPIO_PIN7);
MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P5, GPIO_PIN7);//定义电机正转时的引脚输出

/* 设置 P2.4，P2.5, P2.6 and P2.7 为PWM功能输出 */
MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2,
         GPIO_PIN4 + GPIO_PIN5 + GPIO_PIN6 + GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);

/* 配置Timer_A0 为增减计数模式并启动 */
MAP_Timer_A_configureUpDownMode(TIMER_A0_BASE, &upDownConfig);
MAP_Timer_A_startCounter(TIMER_A0_BASE, TIMER_A_UPDOWN_MODE);

/* 初始化比较寄存器并产生PWM1 */
MAP_Timer_A_initCompare(TIMER_A0_BASE, &compareConfig_PWM1);

/* 初始化比较寄存器并产生 PWM2 */
MAP_Timer_A_initCompare(TIMER_A0_BASE, &compareConfig_PWM2);

/* 初始化比较寄存器并产生 PWM3 */
MAP_Timer_A_initCompare(TIMER_A0_BASE, &compareConfig_PWM3);

/* 初始化比较寄存器并产生 PWM4 */
MAP_Timer_A_initCompare(TIMER_A0_BASE, &compareConfig_PWM4);

/* Sleeping when not in use */
while (1)
{
      MAP_PCM_gotoLPM0();
}
}

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[MSP-EXP432P401R] MSP432P401R增减计数模式固定占空比PWM输出

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[MSP-EXP432P401R] MSP432P401R增减计数模式固定占空比PWM输出

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