怎样才能使用脉宽调制？

我如何在 gpio 引脚上使用 pwm？有人帮帮我吗？有人分享简单的 pwm 示例吗？


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Code: Select all#define PWM_0_OUT_IO_MUX  PERIPHS_IO_MUX_GPIO2_U
#define PWM_0_OUT_IO_NUM  2
#define PWM_0_OUT_IO_FUNC FUNC_GPIO2
#define PWM_CHANNEL 1


Code: Select alluint8_t duty=0;
pwm_init( 150, &duty);
pwm_start();

Code: Select allpwm_set_duty(duty, 0);
pwm_start();

Code: Select all#include
#include
#include
#include

#include \"user_interface.h\"

#define user_procTaskPrio        0
#define user_procTaskQueueLen    1
os_event_t    user_procTaskQueue[user_procTaskQueueLen];

// see eagle_soc.h for these definitions
#define PWM_0_OUT_IO_MUX  PERIPHS_IO_MUX_GPIO2_U
#define PWM_0_OUT_IO_NUM  2
#define PWM_0_OUT_IO_FUNC FUNC_GPIO2

#define PWM_CHANNEL 1

LOCAL uint8_t led_state=0;
LOCAL uint8_t duty=0;

//Main code function for heartbeat LED on GPIO2
void ICACHE_FLASH_ATTR
loop(os_event_t *events)
{
    os_delay_us(10000);

   led_state ? duty-- : duty++;

    if (duty >= 255 ) led_state=1;
    else if (duty <= 10 ) led_state=0;

   pwm_set_duty(duty, 0);
   pwm_start();

    system_os_post(user_procTaskPrio, 0, 0 );
}

void user_init(void)
{
   pwm_init( 150, &duty);
    pwm_start();

    //Start os task
    system_os_task(loop, user_procTaskPrio,user_procTaskQueue, user_procTaskQueueLen);

    system_os_post(user_procTaskPrio, 0, 0 );
}