PWM Library

PWM library

The PWM module is available with a number of MCUs. mikroPascal PRO for FT90x provides a library which simplifies usage of this module.

Prototype	sub function PWM_Init(dim freq_hz as longword) as word
Description	This sub function enables PWM clock, calculates prescaler and counter based on frequency parameter, set continuous mode and disables trigger.
Parameters	`freq_hz:` PWM frequency in Hz (refer to device datasheet for correct values in respect with Fosc).
Returns	This sub function returns calculated counter period (used to set duty ratio).
Requires	MCU must have the HW PWM Module.
Example	duty = PWM_Init(10000)
Notes	None.

Prototype

sub procedure PWM_ConfigChannel(dim dutyRatio as word, dim initState as byte, dim channel as byte)

Description

This sub function configure PWM channel (sets duty ratio, outputs initial level), and enables PWM output to corresponding pad.

Parameters

dutyRatio: PWM duty ratio. Valid values: 0 to timer period returned by the PWM_Init sub function.

initState: initial level of PWM output. Valid values :

Value	Description
_PWM_INIT_STATE_0	Initial PWM level set to zero.
_PWM_INIT_STATE_1	Initial PWM level set to one.

channel: PWM channel.

Returns

Nothing.

Requires

Nothing.

Example

PWM_ConfigChannel(current_duty, _PWM_INIT_STATE_0, _PWM_CHANNEL_4)   ' PWM output on P52 pin

Notes

None.

Prototype	sub procedure PWM_SoftReset()
Description	This sub procedure resets PWM module.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	' reset PWM module PWM_SoftReset()
Notes	None.

Prototype	sub procedure PWM_EnableOutput()
Description	This sub procedure enables PWM module output.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	' Enable PWM module output PWM_EnableOutput()
Notes	None.

Prototype	sub procedure PWM_DisableOutput()
Description	This sub procedure disables PWM module output.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	' Disable PWM module output PWM_DisableOutput()
Notes	None.

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