RTOS_PWM

Pulse width modulation. More...

Files
file	RTOS_PWM.h
	Pulse width modulation.

Macros
#define	PWMUSELFCLK   2
	use PWMUSELFCLK to select LFCLK
#define	PWMUSEMFCLK   4
	use PWMUSEMFCLK to select MFCLK
#define	PWMUSEBUSCLK   8
	use PWMUSEBUSCLK to select bus CLK

Functions
void	PWM0_Init (uint32_t timerClkSrc, uint32_t timerClkPrescale, uint32_t period, uint32_t duty0, uint32_t duty1)
	Initialize PWM. More...
void	PWM0_SetDuty (uint32_t duty0, uint32_t duty1)
	Set duty cycles. More...
void	PWM1_Init (uint32_t timerClkSrc, uint32_t timerClkPrescale, uint32_t period, uint32_t duty0, uint32_t duty1)
	Initialize PWM. More...
void	PWM1_SetDuty (uint32_t duty0, uint32_t duty1)
	Set duty cycles. More...

Detailed Description

Pulse width modulation.

PWM pins on the MSPM0G3507

Pin	Description
PA8	TA0_C0 PWM output
PA9	TA0_C1 PWM output
PB4	TA1_C0 PWM output
PB1	TA1_C1 PWM output

Function Documentation

PWM0_Init()

void PWM0_Init	(	uint32_t	timerClkSrc,
		uint32_t	timerClkPrescale,
		uint32_t	period,
		uint32_t	duty0,
		uint32_t	duty1
	)

Initialize PWM.

Initialize PWM outputs on PA8 PA9. Rising edge synchronized. timerClkDivRatio = 1. Once started, hardware will continuously output the waves.

• timerClkSrc =
  • 2 for 32768 Hz LFCLK
  • 4 for 4MHz MFCLK (not tested)
  • 8 for 80/32/4 BUSCLK
• TimerA0 is on Power domain PD1
  • for 32MHz bus clock, Timer clock is 32MHz
  • for 40MHz bus clock, Timer clock is MCLK 40MHz
  • for 80MHz bus clock, Timer clock is MCLK 80MHz
• PWMFreq = (timerClkSrc / (timerClkDivRatio * (timerClkPrescale + 1) * period))
  • For example, source=LFCLK, prescale = 0, period = 1000, PWM frequency = 32.768 Hz
  • For example, source=BUSCLK, 80MHz bus, prescale=79, period = 10000, PWM frequency = 100Hz

Parameters

timerClkSrc	is 2 4 or 8
timerClkPrescale	divide clock by timerClkPrescale+1, 0 to 255
period	sets the PWM period
duty0	sets the duty cycle on PA8
duty1	sets the duty cycle on PA9

Returns

none

Note

Assumes LaunchPad_Init has been called to reset and activate power

See also

PWM0_SetDuty

PWM0_SetDuty()

void PWM0_SetDuty	(	uint32_t	duty0,
		uint32_t	duty1
	)

Set duty cycles.

Set duty cycles on PA12 PA13.

Parameters

duty0	sets the duty cycle on PA8
duty1	sets the duty cycle on PA9

Returns

none

Note

assumes PWM_Init was called

See also

PWM_Init

PWM1_Init()

void PWM1_Init	(	uint32_t	timerClkSrc,
		uint32_t	timerClkPrescale,
		uint32_t	period,
		uint32_t	duty0,
		uint32_t	duty1
	)

Initialize PWM.

Initialize PWM outputs on PB4 B0. Rising edge synchronized. timerClkDivRatio = 1. Once started, hardware will continuously output the waves.

• timerClkSrc =
  • 2 for 32768 Hz LFCLK
  • 4 for 4MHz MFCLK (not tested)
  • 8 for 80/32/4 BUSCLK
• G0/G8 is on Power domain PD0
  • 32MHz bus clock, BUSCLK clock is 32MHz
  • 40MHz bus clock, BUSCLK clock is ULPCLK 20MHz
  • 80MHz bus clock, BUSCLK clock is ULPCLK 40MHz
• PWMFreq = (timerClkSrc / (timerClkDivRatio * (timerClkPrescale + 1) * period))
  • For example, source=LFCLK, prescale = 0, period = 1000, PWM frequency = 32.768 Hz
  • For example, source=BUSCLK, 80MHz bus, prescale=79, period = 10000, PWM frequency = 100Hz

Parameters

timerClkSrc	is 2 4 or 8
timerClkPrescale	divide clock by timerClkPrescale+1, 0 to 255
period	sets the PWM period
duty0	sets the duty cycle on PB4
duty1	sets the duty cycle on PB1

Returns

none

Note

Assumes LaunchPad_Init has been called to reset and activate power

See also

PWM1_SetDuty

PWM1_SetDuty()

void PWM1_SetDuty	(	uint32_t	duty0,
		uint32_t	duty1
	)

Set duty cycles.

Set duty cycles on PA12 PA13.

Parameters

duty0	sets the duty cycle on PB4
duty1	sets the duty cycle on PB1

Returns

none

Note

assumes PWM_Init was called

See also

PWM1_Init