hc32f460系列输出可调占空比的PWM
参考例程timera_triangular_wave_compare_output修改的输出波形不是方波。哪位大佬能帮我看看哪里有问题。#include "hc32_ddl.h"
/* TIMERA unit and clock definition */
#define TIMERA_UNIT1 (M4_TMRA1)
#define TIMERA_UNIT1_CLOCK (PWC_FCG2_PERIPH_TIMA1)
#define TIMERA_UNIT1_OVERFLOW_INT (INT_TMRA1_OVF)
/* TIMERA channel 1 Port/Pin definition */
#define TIMERA_UNIT1_CH1 (TimeraCh1)
#define TIMERA_UNIT1_CH1_PORT (PortA)
#define TIMERA_UNIT1_CH1_PIN (Pin14)
#define TIMERA_UNIT1_CH1_FUNC (Func_Tima0)
/* TIMERA channel 3 Port/Pin definition */
#define TIMERA_UNIT1_CH3 (TimeraCh3)
#define TIMERA_UNIT1_CH3_PORT (PortA)
#define TIMERA_UNIT1_CH3_PIN (Pin05)
#define TIMERA_UNIT1_CH3_FUNC (Func_Tima0)
static uint8_t u8TmraUnit1Cnt = 0u;
uint16_t u16TimerPeriod = 0u, u16DutyCycle = 0u;
/**
*******************************************************************************
** \brief Timera unit 1 callback function
**
** \param None
**
** \retval None
**
******************************************************************************/
static void TimeraUnit1_IrqCallback(void)
{
u8TmraUnit1Cnt++;
if (u8TmraUnit1Cnt >= 100u) //1s
{
u8TmraUnit1Cnt = 0u;
PORT_Toggle(PortH, Pin02);//LED
}
TIMERA_ClearFlag(TIMERA_UNIT1, TimeraFlagOverflow);
}
/**
*******************************************************************************
** \brief Configure Timera peripheral function
**
** \param None
**
** \retval None
**
******************************************************************************/
static void Timera_Config(void)
{
stc_timera_base_init_t stcTimeraInit;
stc_timera_compare_init_t stcTimerCompareInit;
stc_irq_regi_conf_t stcIrqRegiConf;
stc_timera_hw_startup_config_t stcTimeraHwConfig;
/* configuration structure initialization */
MEM_ZERO_STRUCT(stcTimeraInit);
MEM_ZERO_STRUCT(stcIrqRegiConf);
MEM_ZERO_STRUCT(stcTimerCompareInit);
MEM_ZERO_STRUCT(stcTimeraHwConfig);
/* Configuration peripheral clock */
PWC_Fcg2PeriphClockCmd(TIMERA_UNIT1_CLOCK, Enable);
PWC_Fcg0PeriphClockCmd(PWC_FCG0_PERIPH_AOS, Enable);
/* Configuration TIMERA compare pin */
PORT_SetFunc(TIMERA_UNIT1_CH1_PORT, TIMERA_UNIT1_CH1_PIN, TIMERA_UNIT1_CH1_FUNC, Disable);
PORT_SetFunc(TIMERA_UNIT1_CH3_PORT, TIMERA_UNIT1_CH3_PIN, TIMERA_UNIT1_CH3_FUNC, Disable);
/* Configuration timera unit 1 base structure */
stcTimeraInit.enClkDiv = TimeraPclkDiv128; //100MHz 128分频
//stcTimeraInit.enCntMode = TimeraCountModeSawtoothWave;
stcTimeraInit.enCntMode = TimeraCountModeTriangularWave;
stcTimeraInit.enCntDir = TimeraCountDirUp;
stcTimeraInit.enSyncStartupEn = Disable;
stcTimeraInit.u16PeriodVal = 1000u;
TIMERA_BaseInit(TIMERA_UNIT1, &stcTimeraInit);
/* Configuration timera unit 1 compare structure */
stcTimerCompareInit.u16CompareVal = stcTimeraInit.u16PeriodVal * 4u / 5u;
stcTimerCompareInit.enStartCountOutput = TimeraCountStartOutputLow;
stcTimerCompareInit.enStopCountOutput = TimeraCountStopOutputLow;
stcTimerCompareInit.enCompareMatchOutput = TimeraCompareMatchOutputHigh;
stcTimerCompareInit.enPeriodMatchOutput = TimeraPeriodMatchOutputLow;
stcTimerCompareInit.enSpecifyOutput = TimeraSpecifyOutputInvalid;
stcTimerCompareInit.enCacheEn = Enable;
stcTimerCompareInit.enTriangularTroughTransEn = Enable;
stcTimerCompareInit.enTriangularCrestTransEn = Disable;
stcTimerCompareInit.u16CompareCacheVal = stcTimeraInit.u16PeriodVal * 4u / 5u;
/* Configure Channel 1 */
TIMERA_CompareInit(TIMERA_UNIT1, TIMERA_UNIT1_CH1, &stcTimerCompareInit);
TIMERA_CompareCmd(TIMERA_UNIT1, TIMERA_UNIT1_CH1, Enable);
/* Configure channel 3 */
stcTimerCompareInit.enStartCountOutput = TimeraCountStartOutputHigh;
stcTimerCompareInit.enStopCountOutput = TimeraCountStopOutputHigh;
stcTimerCompareInit.enCompareMatchOutput = TimeraCompareMatchOutputLow;
stcTimerCompareInit.enPeriodMatchOutput = TimeraPeriodMatchOutputHigh;
TIMERA_CompareInit(TIMERA_UNIT1, TIMERA_UNIT1_CH3, &stcTimerCompareInit);
TIMERA_CompareCmd(TIMERA_UNIT1, TIMERA_UNIT1_CH3, Enable);
/* Enable period count interrupt */
TIMERA_IrqCmd(TIMERA_UNIT1, TimeraIrqOverflow, Enable);
/* Interrupt of timera unit 1 */
stcIrqRegiConf.enIntSrc = TIMERA_UNIT1_OVERFLOW_INT;
stcIrqRegiConf.enIRQn = Int006_IRQn;
stcIrqRegiConf.pfnCallback = &TimeraUnit1_IrqCallback;
enIrqRegistration(&stcIrqRegiConf);
NVIC_ClearPendingIRQ(stcIrqRegiConf.enIRQn);
NVIC_SetPriority(stcIrqRegiConf.enIRQn, DDL_IRQ_PRIORITY_DEFAULT);
NVIC_EnableIRQ(stcIrqRegiConf.enIRQn);
TIMERA_Cmd(TIMERA_UNIT1,Enable);
TIMERA_SetCompareValue(TIMERA_UNIT1, TIMERA_UNIT1_CH1, stcTimeraInit.u16PeriodVal * 4u / 5u);
TIMERA_SetCompareValue(TIMERA_UNIT1, TIMERA_UNIT1_CH3, stcTimeraInit.u16PeriodVal * 4u / 5u);
}
/**
*******************************************************************************
** \briefmain function for Timera compare function
**
** \param None
**
** \retval int32_t Return value, if needed
**
******************************************************************************/
int32_t main(void)
{
stc_port_init_t stcPortInit;
MEM_ZERO_STRUCT(stcPortInit);
stcPortInit.enPinMode = Pin_Mode_Out;
stcPortInit.enExInt = Enable;
stcPortInit.enPullUp = Enable;
PORT_Init(PortH, Pin02,&stcPortInit);//Led
/* BSP initialization */
BSP_CLK_Init();
/* Configure Timera */
Timera_Config();
while (1)
{
;
}
}
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
效果如何呢 PWM中占空比和输出电压的关系? PWM用好了，很好用。 怎么才能输出占空比可调的PWM
pwm的频率和占空比之间的关系? 楼主解决没？ 如何输出占空比可变的PWM信号 是不是相当于可调电压输出? 如何用hc32f460单片机输出一个占空比可调的方波 如何通过调节PWM的占空比来调节电压 实际波形的占空比大概是多少啊 微微调整一下高低电平的比例 就是在一个周期内调整高低电平的比例就行了 wilhelmina2 发表于 2022-10-5 17:01
pwm的频率和占空比之间的关系?
频率和占空比没有任何关系占空比就是一个周期内高低电平所占比例 可以通过寄存器直接配置输出的占空比吗 yeates333 发表于 2022-10-2 22:53
PWM中占空比和输出电压的关系?
输出电压应该是pwm波 其有效值和占空比有关系但是幅值没有任何关系 如何通过调节电位器,用来控制pwm占空比 1，输出PWM频率 2，输出电压 3，可变占空比比例大小 利用AD采样得到的值控制输出占空比可调的PWM？
页:
[1]
2