sub_pwm

sub_pwm_set

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Synopsis

int sub_pwm_set( sub_handle hndl, int pwm_n, int duty )

Configure specific PWM output.

Parameters

•	pwm_n - number of PWM output to configure. Can be 0..7.

•	duty - Duty cycle in range 0..255

Duty cycle

•	If duty cycle is 0, PWM output will be constantly low

•	If duty cycle is grater or equal to the limit set by sub_pwm_config, PWM output will be constantly high

Effective duty cycle in percent can be calculated as

DUTY% = duty/limit * 100%

Duty cycle resolution in bits depends on limit. It can be in range of 1 bit for limit=2 up to 8 bit for limit=255

Return value

On success function returns 0. Otherwise error code.

Example

/* Set PWM resolution=10ms, limit=100, frequency=1Hz */

sub_pwm_config( hndl, 10000, 100 );

/* Set PWM_0 pin (GPIO24) to output state */

sub_gpio_config( hndl, 0x01000000, &config, 0x01000000 );

/* Output 50% duty cycle on PWM_0 pin */

sub_pwm_set( hndl, 0, 50 );