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器件型号：MSP430FR2433 我正在尝试使用 TIMER_A_ex1_pwmSingle 示例作为模板将 P1.1设置为 PWM 输出。
我一直在讨论如何将 P1.1初始化为 PWM 输出。
根据我的理解、我需要设置寄存器 P1DIR = 0b01和寄存器 P1SEL1 = 0b01、以将 P1.1初始化为 PWM 输出。
函数时的示例
GPIO_setPeripheralModuleFunctionOutputPin (
GPIO_PORT_P1、
GPIO_PIN1、
GPIO_secondary 模块功能
)；
而是以 P1SEL0寄存器为目标。
如前面提到的示例中所示、将 P1.1配置为 PWM 输出需要做什么？
下面是我的代码-首先让我们重点介绍71 - 76行、我尝试将 P1.1初始化为 PWM 输出。
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//*******************************************************************************
//! Timer_A3, PWM TA1.2, Up Mode, DCO SMCLK
//!
//! Description: This program generates PWM outputs on P2.2 using
//! Timer1_A configured for up mode. The value , TIMER_PERIOD, defines the PWM
//! period and the value DUTY_CYCLE the PWM duty cycle. Using ~1.048MHz
//! SMCLK as TACLK, the timer period is ~480us with a 75% duty cycle on P4.0
//! ACLK = n/a, SMCLK = MCLK = TACLK = default DCO ~1.048MHz.
//!
//! Tested On: MSP430FR4133
//! -------------------
//! /|\| |
//! | | |
//! --|RST |
//! | |
//! | P4.0/TA1.1|--> CCR1 - 75% PWM
//! | |
//!
//! This example uses the following peripherals and I/O signals. You must
//! review these and change as needed for your own board:
//! - Timer peripheral
//! - GPIO peripheral
//!
//! This example uses the following interrupt handlers. To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - NONE
//******************************************************************************
#include "driverlib.h"
#define TIMER_A_PERIOD 524
#define DUTY_CYCLE 393
void main (void)
{
//Stop WDT
WDT_A_hold(WDT_A_BASE);
//P1.1 as PWM output
GPIO_setAsPeripheralModuleFunctionOutputPin(
GPIO_PORT_P1,
GPIO_PIN1,
GPIO_SECONDARY_MODULE_FUNCTION
);
/*
* Disable the GPIO power-on default high-impedance mode to activate
* previously configured port settings
*/
PMM_unlockLPM5();
//Generate PWM - Timer runs in Up-Down mode
Timer_A_outputPWMParam param = {0};
param.clockSource = TIMER_A_CLOCKSOURCE_SMCLK;
param.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1;
param.timerPeriod = TIMER_A_PERIOD;
param.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_1;
param.compareOutputMode = TIMER_A_OUTPUTMODE_RESET_SET;
param.dutyCycle = DUTY_CYCLE;
Timer_A_outputPWM(TIMER_A1_BASE, ¶m);
//Enter LPM0
__bis_SR_register(LPM0_bits);
//For debugger
__no_operation();
}
