alientek/drivers/pwm/pwm.c

#include "pwm.h"

void pwm_init(pwm_content_t *pwm_content)
{
    RCC_APB1PeriphClockCmd(pwm_content->pwm_timer_rcu, ENABLE);
    RCC_AHB1PeriphClockCmd(pwm_content->pwm_gpio_rcu, ENABLE);

    // GPIO初始化
    GPIO_PinAFConfig(pwm_content->pwm_gpio_port, pwm_content->pwm_gpio_af, pwm_content->pwm_time_af);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin   = pwm_content->pwm_gpio_pin;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
    GPIO_Init(pwm_content->pwm_gpio_port, &GPIO_InitStructure);

    // 定时器初始化
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period            = pwm_content->pwm_period;    // 定时时间的配置，也就是配置重载值，而重载值会传递给计数值
    TIM_TimeBaseStructure.TIM_Prescaler         = pwm_content->pwm_prescaler; // 配置分频值，确定定时器的时钟频率
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision     = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode       = TIM_CounterMode_Up; // 向上计数，0->TIM_Period就会触发中断请求
    TIM_TimeBaseInit(pwm_content->pwm_timer, &TIM_TimeBaseStructure);

    // PWM初始化
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_OCInitStructure.TIM_OCMode       = pwm_content->pwm_timer_ch;
    TIM_OCInitStructure.TIM_OutputState  = TIM_OutputState_Enable; // 输出状态使能
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
    TIM_OCInitStructure.TIM_Pulse        = pwm_content->pwm_pulse;
    TIM_OCInitStructure.TIM_OCPolarity   = TIM_OCPolarity_High; // 有效状态为高电平
    TIM_OCInitStructure.TIM_OCNPolarity  = TIM_OCNPolarity_High;
    TIM_OCInitStructure.TIM_OCIdleState  = TIM_OCIdleState_Reset;
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
    TIM_OC1Init(pwm_content->pwm_timer, &TIM_OCInitStructure);

    // PWM设置
    TIM_OC1PreloadConfig(pwm_content->pwm_timer, TIM_OCPreload_Enable);

    // 自动重装
    TIM_ARRPreloadConfig(pwm_content->pwm_timer, ENABLE);

    // 使能定时器
    TIM_Cmd(pwm_content->pwm_timer, ENABLE);
}
void pwm_mode(pwm_content_t *pwm_content, uint8_t status)
{
    if (1 == status)
    {
        if (pwm_content->pwm_status == 0)
        {
            TIM_Cmd(pwm_content->pwm_timer, ENABLE);
            pwm_content->pwm_status = 1;
        }
    }

    if (0 == status)
    {
        if (pwm_content->pwm_status == 1)
        {
            TIM_Cmd(pwm_content->pwm_timer, DISABLE);
            GPIO_InitTypeDef GPIO_InitStructure;
            GPIO_InitStructure.GPIO_Pin   = pwm_content->pwm_gpio_pin;
            GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
            GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
            GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
            GPIO_Init(pwm_content->pwm_gpio_port, &GPIO_InitStructure);
            // GPIO_ResetBits(pwm_content->pwm_gpio_port, pwm_content->pwm_gpio_pin);
            pwm_content->pwm_status = 0;
        }
    }
}

pwm_content_t pwm_timer3_content = {
    .pwm_gpio_port = GPIOF,
    .pwm_gpio_pin  = GPIO_Pin_9,
    .pwm_gpio_rcu  = RCC_AHB1Periph_GPIOF,
    .pwm_gpio_af   = GPIO_PinSource9,
    .pwm_time_af   = GPIO_AF_TIM14,
    .pwm_timer_rcu = RCC_APB1Periph_TIM14,
    .pwm_timer     = TIM14,
    .pwm_timer_ch  = TIM_OCMode_PWM1,
    .pwm_prescaler = 84 - 1,
    .pwm_period    = 500 - 1,
    .pwm_pulse     = 50,
    .pwm_status    = 0,
};