bsp_pwm_output

ID:583158 · 發(fā)表于 2019-7-19 14:30

#include "bsp_pwm_output.h"
/**
* @brief 配置TIM3復用輸出PWM時用到的I/O
* @param 無
* @retval 無
*/
static void TIMx_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO,ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_NoJTRST, ENABLE); //PB4
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// /*GPIOB Configuration: TIM3 channel 2 as alternate function push-pull */
// GPIO_InitStructure.GPIO_Pin = macTIM_CH2_PIN;
// GPIO_Init(macTIM_CH2_PORT, &GPIO_InitStructure);
}
/**
* @brief 配置TIM3輸出的PWM信號的模式，如周期、極性、占空比
* @param 無
* @retval 無
*/
/*
* TIMxCLK/CK_PSC --> TIMxCNT --> TIMx_ARR --> TIMxCNT 重新計數(shù)
* TIMx_CCR(電平發(fā)生變化)
* 信號周期=(TIMx_ARR +1 ) * 時鐘周期
* 占空比=TIMx_CCR/(TIMx_ARR +1)
*/
static void TIMx_Mode_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信號電平跳變值 */
u16 CCR1_Val = 500;
u16 CCR2_Val = 0;
// u16 CCR3_Val = 250;
// u16 CCR4_Val = 125;
/* -----------------------------------------------------------------------
macTIMx Channel1 duty cycle = (macTIMx_CCR1/ macTIMx_ARR+1)* 100% = 50%
macTIMx Channel2 duty cycle = (macTIMx_CCR2/ macTIMx_ARR+1)* 100% = 37.5%
macTIMx Channel3 duty cycle = (macTIMx_CCR3/ macTIMx_ARR+1)* 100% = 25%
macTIMx Channel4 duty cycle = (macTIMx_CCR4/ macTIMx_ARR+1)* 100% = 12.5%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 999; //當定時器從0計數(shù)到999，即為1000次，為一個定時周期
TIM_TimeBaseStructure.TIM_Prescaler = 0; //設置預分頻：不預分頻，即為72MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ; //設置時鐘分頻系數(shù)：不分頻(這里用不到)
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數(shù)模式
TIM_TimeBaseInit(macTIMx, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置為PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //設置跳變值，當計數(shù)器計數(shù)到這個值時，電平發(fā)生跳變
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //當定時器計數(shù)值小于CCR1_Val時為高電平
TIM_OC1Init(macTIMx, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(macTIMx, TIM_OCPreload_Enable);
// /* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //設置通道2的電平跳變值，輸出另外一個占空比的PWM
TIM_OC2Init(macTIMx, &TIM_OCInitStructure); //使能通道2
TIM_OC2PreloadConfig(macTIMx, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(macTIMx, ENABLE); // 使能TIM3重載寄存器ARR
/* TIM3 enable counter */
TIM_Cmd(macTIMx, ENABLE); //使能定時器3
}
/**
* @brief TIM3 輸出PWM信號初始化，只要調(diào)用這個函數(shù)
* TIM3的四個通道就會有PWM信號輸出
* @param 無
* @retval 無
*/
void TIMx_PWM_Init(void)
{
TIMx_GPIO_Config();
TIMx_Mode_Config();
}
/*********************************************END OF FILE**********************/

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ID:1 · 發(fā)表于 2019-7-20 03:14

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bsp_pwm_output

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