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標(biāo)題: STM32編程輸出可調(diào)的硬件PWM，頻率范圍1Hz-1MHz，占空比0-100% [打印本頁(yè)]

作者: hushe 時(shí)間: 2015-12-22 19:49
標(biāo)題: STM32編程輸出可調(diào)的硬件PWM，頻率范圍1Hz-1MHz，占空比0-100%
【原創(chuàng)】編程輸出可調(diào)的硬件PWM，頻率范圍1Hz-1MHz，占空比0-100%

uint32_t TIM4_PWM_FQ = 50;          /* TIM4_CH1_PWM輸出頻率設(shè)置值，1-1000000 */
uint32_t TIM4_PWM_FQ_Old  = 0;
uint16_t TIM4_PWM_Pulse = 50;       /* TIM4_CH1_PWM輸出占空比設(shè)置值，0-100 */
uint16_t TIM4_PWM_Pulse_Old = 0;

uint32_t SystemCoreClock = 168000000;

/*
* 函數(shù)功能: 定時(shí)器4配置為硬件PWM模式(不開(kāi)啟TIM4的定時(shí)及DMA傳輸中斷)
* TIM4_PWM_FQ:    TIM4_CH1_PWM 頻率 1Hz至1000000Hz
* TIM4_PWM_Pulse:  TIM4_CH1_PWM 占空比  0-100%
*/
void StdPeriph_TIM4_PWM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

uint32_t temp32;
uint32_t uhTimerfrequency;
uint16_t uhTimerPeriod;
uint16_t uhTimerPulse;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

#ifdef USE_PB6_PWM
// TIM4_CH1_PWM: PB6
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

// GPIOB Configuration
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
#else
// TIM4_CH1_PWM: PD12
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

// GPIOD Configuration
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
#endif
uhTimerfrequency = 200000; /* 初始化 200KHz */
temp32 = ((SystemCoreClock /2) / uhTimerfrequency);
if(temp32 > 65535) temp32 = 65535;
uhTimerPeriod = (uint16_t) temp32;
uhTimerPulse  = uhTimerPeriod * 50 / 100; /* 占空比50% */

// Time base configuration
TIM_TimeBaseStructure.TIM_Period = uhTimerPeriod - 1; /* 0x0000 and 0xFFFF */
TIM_TimeBaseStructure.TIM_Prescaler = 0; /* 0x0000 and 0xFFFF */
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

// PWM1 Mode configuration: Channel1
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = uhTimerPulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_GenerateEvent(TIM4, TIM_EventSource_Update);

TIM_Cmd(TIM4, ENABLE);
}

/*
* 函數(shù)功能: 刷新TIM4_CH1_PWM輸出的頻率和占空比
* 修改TIM4_PWM_FQ的值，調(diào)節(jié)PWM頻率(1Hz至1MHz)
* 修改TIM4_PWM_Pulse的值，調(diào)節(jié)PWM的占空比(0-100)
*/

void StdPeriph_TIM4_PWM_Update(void)
{
  uint32_t temp32;
  uint32_t uhTimerfrequency;
  uint16_t uhTimerPeriod;
  uint16_t uhTimerPrescaler;
  uint16_t uhTimerPulse;

  if ((TIM4_PWM_FQ_Old != TIM4_PWM_FQ) || (TIM4_PWM_Pulse_Old != TIM4_PWM_Pulse)){
TIM4_PWM_FQ_Old = TIM4_PWM_FQ;
TIM4_PWM_Pulse_Old = TIM4_PWM_Pulse;
if(TIM4_PWM_FQ >= 4000){
   uhTimerfrequency = TIM4_PWM_FQ;  /* 定時(shí)器計(jì)時(shí)頻率和PWM頻率相等 */
   uhTimerPrescaler = 1; /* 實(shí)際頻率TIM4_PWM_FQ較大時(shí)，TIM4設(shè)置分頻為1(不分頻) */
}else{
   uhTimerfrequency = 4000; /* 實(shí)際頻率TIM4_PWM_FQ較小時(shí)，和4000Hz的頻率比較，看相差幾倍 */
   uhTimerPrescaler = 4000 / TIM4_PWM_FQ;  /* 實(shí)際頻率和4000相差的倍數(shù)作為T(mén)IM4的分頻設(shè)置值 */
   uhTimerfrequency = uhTimerPrescaler * TIM4_PWM_FQ; /* TIM4分頻后，計(jì)時(shí)周期變長(zhǎng)，需要將uhTimerfrequency倍頻  */
}

/* TIM4的周期要通過(guò)倍頻uhTimerfrequency來(lái)計(jì)算,uhTimerPeriod = 84MHz / uhTimerfrequency */
temp32 = ((SystemCoreClock /2) / uhTimerfrequency);
if(temp32 > 65535) temp32 = 65535;
uhTimerPeriod = (uint16_t) temp32;

if(TIM4_PWM_Pulse > 100) TIM4_PWM_Pulse = 100;
uhTimerPulse = uhTimerPeriod * TIM4_PWM_Pulse/ 100;

TIM4->ARR  = uhTimerPeriod - 1;
TIM4->PSC  = uhTimerPrescaler - 1;
TIM4->CCR1 = uhTimerPulse;
TIM4->EGR  = TIM_PSCReloadMode_Update;
  }
}

作者: --eternal-- 時(shí)間: 2018-5-9 22:24
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