ESP8266 datasheet(100/117 Pages) ESPRESSIF

100 / 117 page

12. PWM Interface

3. pwm_set_duty

4. pwm_get_period

5. pwm_get_duty

Sample code

pwm_set_period (uint32 period)

Description

Set PWM period, unit: μs.

For example, PWM period at 1KHz is1000 μs.

Parameters

uint32 period: PWM period.

Call

Call pwm_start() after the parameters has been set.

Returned Value

Null

Function Name

pwm_set_duty

Deﬁnition

Set the duty ratio of PWM signal at a certain channel

Sample code

pwm_set_duty (uint32 duty, uint8 channel)

Description

Set PWM duty ratio. Set the time period of PWM signal when the voltage is high. The value

of duty ratio change with PWM period.

PWM duty ratio can reach period*1000/45 at most. For example, the range of duty ratio is

between 0 and 22222 at 1kHz refresh rate.

Parameters

• uint32 duty: set the time parameter when the voltage is high. Duty ratio is (duty*45)/

(period*1000).

• uint8 channel: PWM channel that needs to be set at present. This parameter is deﬁned

in PWM_CHANNEL.

Call

Call pwm_start() after the parameters has been set.

Returned Value

Null

Function Name

pwm_get_period

Description

Get the current PWM period.

Sample code

pwm_get_period (void)

Description

None.

Returned Value

PWM period, unit: μs.

Function Name

pwm_get_duty

Description

Get the duty ratio of current PWM signal at a certain channel.

Sample code

pwm_get_duty (uint8 channel)

Parameter

uint8 channel: get the current PWM channel. This parameter is deﬁned in PWM_CHANNEL.

Espressif

! /!

92 104

2017.05

ESP8266 Datasheet(PDF) 100 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP8266 Datasheet(HTML) 100 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL