Mikroelektronika MIKROE-724 Scheda Tecnica

mikroBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

433

PWM_Init

PWM_Set_Duty

sub function PWM_Init(dim freq_hz as longint, dim enable_channel_x, timer_

prescale, use_timer_x as word) as word

sub function PWM_Init(dim freq_hz as longint, dim enable_channel_x, timer_

prescale) as word

Description Initializes the PWM module with duty ratio 0.
Parameters - 

freq_hz

: PWM frequency in Hz (refer to device datasheet for correct values in respect with Fosc) 

- 

enable_channel_x

:  number  of  PWM  channel  to  be  initialized.  Refer  to  MCU’s  datasheet  for 

available PWM channels 

- 

timer_prescale

: timer prescaler parameter. Valid values: 

1, 8, 64,

 and 

256

 

- 

use_timer_x

: timer to be used with the PWM module. Valid values: 

2

 (Timer2) and 

3

 (Timer3) 

- 

0xFFFF

 - if timer settings are not valid 

- otherwise returns calculated timer period 

MCU must have the HW PWM Module.

 

:

dim pwm_period1 as word

...

pwm_period1 = PWM_Init(5000, 1, 0, 2)

Number of available PWM channels depends on MCU. Refer to MCU datasheet for details.

sub procedure PWM_Set_Duty(dim duty, channel as word)

Description The function changes PWM duty ratio.
Parameters - 

duty

: PWM duty ratio. Valid values: 

0

 to timer period returned by the PWM_Init function. 

- 

channel

: number of PWM channel to change duty to. 

Nothing.

MCU must have the HW PWM Module.

PWM channel must be properly initialized. See PWM_Init routine.

dim pwm_period1 as word

...

PWM_Set_Duty(pwm_period1 div 2, 1)

Number of available PWM channels depends on MCU. Refer to MCU datasheet for details.