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	function PWM_Init(freq_hz : dword) : word;
Description	This 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 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

procedure PWM_ConfigChannel(dutyRatio : word; initState : byte; channel : byte);

Description

This 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 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	procedure PWM_SoftReset();
Description	This procedure resets PWM module.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	// reset PWM module PWM_SoftReset();
Notes	None.

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

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

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