PWM

4G LTE Module PWM Channel Mapping

PWM Channel	EC600U	EC200U	N58	N716	L610
PWM CH 0	Pin 70	Pin 135	Pin 39	Pin 38	Pin 135
PWM CH 1	Pin 54	Pin 5	–	Pin 67	Pin 5

GSM/NB-IoT Module PWM Channel Mapping

PWM Channel	MC20U Pin S20U Pin	M56 Pin	MC60 Pin MC20 Pin	M66 Pin	BC20 Pin	SIM868 Pin
PWM CH 0	Pin 47	Pin 12	Pin 47	Pin 16	Pin 47	Pin 6
PWM CH 1	Pin 28	Pin 27	Pin 28	–	Pin 3	Pin 57
PWM CH 2	–	–	–	–	Pin 36	–
PWM CH 4	–	–	–	–	Pin 61	–

API Reference

Header File

• include/hw/pwm.h

Functions

int pwm_init(int ch)

Initialize PWM channel and setup pin-muxing. This function must be called before calling any other PWM function.

Return

0 on success, negative value on error

Parameters

• ch: PWM Channel pwmch_e

int pwm_config(int ch, unsigned int freq, unsigned int cycle)

Configure PWM channel parameters

Return

0 on success, negative value on error

Parameters

• ch: PWM Channel to configure pwmch_e

• freq: PWM Frequency to set

• cycle: PWM Duty cycle

int pwm_start(int ch)

Start PWM output

Return

0 on success, negative value on error

Parameters

• ch: PWM Channel to start pwmch_e

int pwm_stop(int ch)

Stop PWM output

Return

0 on success, negative value on error

Parameters

• ch: PWM Channel to stop pwmch_e

int pwm_free(int ch)

Release PWM channel and IO function changed to GPIO

Return

0 on success, negative value on error

Parameters

• ch: PWM Channel to free pwmch_e

Note

Please refer header file for actual number of channels available for respective board.

Header File

• include/plat/def_pwm.h

Enumerations

enum pwm1_prd_e

PWM Channel 1 - Fixed Period in milliseconds

Note

: Only for Platform with RDA8910 SoC

Values:

enumerator PWM1_PRD_125MS

enumerator PWM1_PRD_250MS

enumerator PWM1_PRD_500MS

enumerator PWM1_PRD_1000MS

enumerator PWM1_PRD_1500MS

enumerator PWM1_PRD_2000MS

enumerator PWM1_PRD_2500MS

enumerator PWM1_PRD_3000MS

enum pwm1_duty_e

PWM Channel 1 - Fixed Ontime/Duty cycle in milliseconds

Note

: Only for Platform with RDA8910 SoC

Values:

enumerator PWM1_DUTY_UNDEFINE

enumerator PWM1_DUTY_15_6MS

enumerator PWM1_DUTY_31_2MS

enumerator PWM1_DUTY_46_8MS

enumerator PWM1_DUTY_62MS

enumerator PWM1_DUTY_78MS

enumerator PWM1_DUTY_94MS

enumerator PWM1_DUTY_110MS

enumerator PWM1_DUTY_125MS

enumerator PWM1_DUTY_140MS

enumerator PWM1_DUTY_156MS

enumerator PWM1_DUTY_172MS

enumerator PWM1_DUTY_188MS

enumerator PWM1_DUTY_200MS

enumerator PWM1_DUTY_218MS

enumerator PWM1_DUTY_234MS

enum pwmch_e

PWM Channels

Values:

enumerator PWM_CH0

PWM Channel 0 - Pin 47

enumerator PWM_CH1

PWM Channel 1 - Pin 3

enumerator PWM_CH2

PWM Channel 2 - Pin 36

enumerator PWM_CH3

PWM Channel 3 - Pin 61