PRS - Peripheral Reflex System#

Peripheral Reflex System (PRS) Peripheral API.

This module contains functions to control the PRS peripheral of Silicon Labs 32-bit MCUs and SoCs. The PRS allows configurable, fast, and autonomous communication between peripherals on the MCU or SoC.

Enumerations#

enum

PRS_ChType_t {

prsTypeAsync

prsTypeSync

}

PRS Channel type.

enum

PRS_Edge_TypeDef {

prsEdgeOff

prsEdgePos

prsEdgeNeg

prsEdgeBoth

}

Edge detection type.

enum

PRS_Signal_t {

prsSignalNone = PRS_CH_CTRL_SOURCESEL_NONE | (0x0 << _PRS_CH_CTRL_SIGSEL_SHIFT)

prsSignalSW = PRS_CH_CTRL_SOURCESEL_NONE | (0x1 << _PRS_CH_CTRL_SIGSEL_SHIFT)

prsSignalADC0_SINGLE = PRS_ADC0_SINGLE

prsSignalADC0_SCAN = PRS_ADC0_SCAN

prsSignalTIMER0_UF = PRS_TIMER0_UF

prsSignalTIMER0_OF = PRS_TIMER0_OF

prsSignalTIMER0_CC0 = PRS_TIMER0_CC0

prsSignalTIMER0_CC1 = PRS_TIMER0_CC1

prsSignalTIMER0_CC2 = PRS_TIMER0_CC2

prsSignalTIMER1_UF = PRS_TIMER1_UF

prsSignalTIMER1_OF = PRS_TIMER1_OF

prsSignalTIMER1_CC0 = PRS_TIMER1_CC0

prsSignalTIMER1_CC1 = PRS_TIMER1_CC1

prsSignalTIMER1_CC2 = PRS_TIMER1_CC2

prsSignalTIMER2_UF = PRS_TIMER2_UF

prsSignalTIMER2_OF = PRS_TIMER2_OF

prsSignalTIMER2_CC0 = PRS_TIMER2_CC0

prsSignalTIMER2_CC1 = PRS_TIMER2_CC1

prsSignalTIMER2_CC2 = PRS_TIMER2_CC2

prsSignalTIMER3_UF = PRS_TIMER3_UF

prsSignalTIMER3_OF = PRS_TIMER3_OF

prsSignalTIMER3_CC0 = PRS_TIMER3_CC0

prsSignalTIMER3_CC1 = PRS_TIMER3_CC1

prsSignalTIMER3_CC2 = PRS_TIMER3_CC2

prsSignalLETIMER0_CH0 = PRS_LETIMER0_CH0

prsSignalLETIMER0_CH1 = PRS_LETIMER0_CH1

prsSignalRTC_OF = PRS_RTC_OF

prsSignalRTC_COMP0 = PRS_RTC_COMP0

prsSignalRTC_COMP1 = PRS_RTC_COMP1

prsSignalBURTC_COMP = PRS_BURTC_COMP

prsSignalBURTC_OF = PRS_BURTC_OF

prsSignalACMP0_OUT = PRS_ACMP0_OUT

prsSignalACMP1_OUT = PRS_ACMP1_OUT

prsSignalLESENSE_SCANRES0 = PRS_LESENSE_SCANRES0

prsSignalLESENSE_SCANRES1 = PRS_LESENSE_SCANRES1

prsSignalLESENSE_SCANRES2 = PRS_LESENSE_SCANRES2

prsSignalLESENSE_SCANRES3 = PRS_LESENSE_SCANRES3

prsSignalLESENSE_SCANRES4 = PRS_LESENSE_SCANRES4

prsSignalLESENSE_SCANRES5 = PRS_LESENSE_SCANRES5

prsSignalLESENSE_SCANRES6 = PRS_LESENSE_SCANRES6

prsSignalLESENSE_SCANRES7 = PRS_LESENSE_SCANRES7

prsSignalLESENSE_SCANRES8 = PRS_LESENSE_SCANRES8

prsSignalLESENSE_SCANRES9 = PRS_LESENSE_SCANRES9

prsSignalLESENSE_SCANRES10 = PRS_LESENSE_SCANRES10

prsSignalLESENSE_SCANRES11 = PRS_LESENSE_SCANRES11

prsSignalLESENSE_SCANRES12 = PRS_LESENSE_SCANRES12

prsSignalLESENSE_SCANRES13 = PRS_LESENSE_SCANRES13

prsSignalLESENSE_SCANRES14 = PRS_LESENSE_SCANRES14

prsSignalLESENSE_SCANRES15 = PRS_LESENSE_SCANRES15

prsSignalLESENSE_DEC0 = PRS_LESENSE_DEC0

prsSignalLESENSE_DEC1 = PRS_LESENSE_DEC1

prsSignalLESENSE_DEC2 = PRS_LESENSE_DEC2

prsSignalUSART1_TXC = PRS_USART1_TXC

prsSignalUSART1_RXDATAV = PRS_USART1_RXDATAV

prsSignalUSART2_TXC = PRS_USART2_TXC

prsSignalUSART2_RXDATAV = PRS_USART2_RXDATAV

prsSignalUART0_TXC = PRS_UART0_TXC

prsSignalUART0_RXDATAV = PRS_UART0_RXDATAV

prsSignalUART1_TXC = PRS_UART1_TXC

prsSignalUART1_RXDATAV = PRS_UART1_RXDATAV

prsSignalGPIO_PIN0 = PRS_GPIO_PIN0

prsSignalGPIO_PIN1 = PRS_GPIO_PIN1

prsSignalGPIO_PIN2 = PRS_GPIO_PIN2

prsSignalGPIO_PIN3 = PRS_GPIO_PIN3

prsSignalGPIO_PIN4 = PRS_GPIO_PIN4

prsSignalGPIO_PIN5 = PRS_GPIO_PIN5

prsSignalGPIO_PIN6 = PRS_GPIO_PIN6

prsSignalGPIO_PIN7 = PRS_GPIO_PIN7

prsSignalGPIO_PIN8 = PRS_GPIO_PIN8

prsSignalGPIO_PIN9 = PRS_GPIO_PIN9

prsSignalGPIO_PIN10 = PRS_GPIO_PIN10

prsSignalGPIO_PIN11 = PRS_GPIO_PIN11

prsSignalGPIO_PIN12 = PRS_GPIO_PIN12

prsSignalGPIO_PIN13 = PRS_GPIO_PIN13

prsSignalGPIO_PIN14 = PRS_GPIO_PIN14

prsSignalGPIO_PIN15 = PRS_GPIO_PIN15

}

PRS Signal.

Functions#

void

PRS_LevelSet(uint32_t level, uint32_t mask)

Set level control bit for one or more channels.

uint32_t

PRS_LevelGet(void)

Get level control bit for all channels.

void

PRS_PulseTrigger(uint32_t channels)

Trigger a high pulse (one HFPERCLK) for one or more channels.

void

PRS_ChannelLevelSet(unsigned int ch, bool level)

Set the PRS channel level for one asynchronous PRS channel.

void

PRS_ChannelPulse(unsigned int ch)

Trigger a pulse on one PRS channel.

void

PRS_SourceSignalSet(unsigned int ch, uint32_t source, uint32_t signal, PRS_Edge_TypeDef edge)

Set a source and signal for a channel.

void

PRS_SourceAsyncSignalSet(unsigned int ch, uint32_t source, uint32_t signal)

Set the source and asynchronous signal for a channel.

void

PRS_GpioOutputLocation(unsigned int ch, unsigned int location)

Send the output of a PRS channel to a GPIO pin.

int

PRS_GetFreeChannel(PRS_ChType_t type)

Search for the first free PRS channel.

void

PRS_Reset(void)

Reset all PRS channels.

void

PRS_ConnectSignal(unsigned int ch, PRS_ChType_t type, PRS_Signal_t signal)

Connect a PRS signal to a channel.

Macros#

#define

PRS_SYNC_CHAN_COUNT PRS_CHAN_COUNT

PRS Synchronous channel count.

#define

PRS_ASYNC_CHAN_COUNT PRS_CHAN_COUNT

PRS Asynchronous channel count.

#define

PRS_ASYNC_SUPPORTED 1

PRS asynchronous support.

Enumeration Documentation#

PRS_ChType_t#

PRS_ChType_t

PRS Channel type.

Enumerator
prsTypeAsync	Asynchronous channel type.
prsTypeSync	Synchronous channel type.

PRS_Edge_TypeDef#

PRS_Edge_TypeDef

Edge detection type.

Enumerator
prsEdgeOff	Leave signal as is.
prsEdgePos	Generate pulses on positive edge.
prsEdgeNeg	Generate pulses on negative edge.
prsEdgeBoth	Generate pulses on both edges.

PRS_Signal_t#

PRS_Signal_t

PRS Signal.

Enumerator
prsSignalNone	No Signal.
prsSignalSW	Software-reserved Signal.
prsSignalADC0_SINGLE	ADC0_SINGLE signal.
prsSignalADC0_SCAN	ADC0_SCAN signal.
prsSignalTIMER0_UF	TIMER0 underflow Signal.
prsSignalTIMER0_OF	TIMER0 overflow Signal.
prsSignalTIMER0_CC0	TIMER0 capture/compare channel 0 Signal.
prsSignalTIMER0_CC1	TIMER0 capture/compare channel 1 Signal.
prsSignalTIMER0_CC2	TIMER0 capture/compare channel 2 Signal.
prsSignalTIMER1_UF	TIMER1 underflow Signal.
prsSignalTIMER1_OF	TIMER1 overflow Signal.
prsSignalTIMER1_CC0	TIMER1 capture/compare channel 0 Signal.
prsSignalTIMER1_CC1	TIMER1 capture/compare channel 1 Signal.
prsSignalTIMER1_CC2	TIMER1 capture/compare channel 2 Signal.
prsSignalTIMER2_UF	TIMER2 underflow Signal.
prsSignalTIMER2_OF	TIMER2 overflow Signal.
prsSignalTIMER2_CC0	TIMER2 capture/compare channel 0 Signal.
prsSignalTIMER2_CC1	TIMER2 capture/compare channel 1 Signal.
prsSignalTIMER2_CC2	TIMER2 capture/compare channel 2 Signal.
prsSignalTIMER3_UF	TIMER3 underflow Signal.
prsSignalTIMER3_OF	TIMER3 overflow Signal.
prsSignalTIMER3_CC0	TIMER3 capture/compare channel 0 Signal.
prsSignalTIMER3_CC1	TIMER3 capture/compare channel 1 Signal.
prsSignalTIMER3_CC2	TIMER3 capture/compare channel 2 Signal.
prsSignalLETIMER0_CH0	LETIMER0 channel 0 Signal.
prsSignalLETIMER0_CH1	LETIMER0 channel 1 Signal.
prsSignalRTC_OF	RTC_OF signal.
prsSignalRTC_COMP0	RTC_COMP0 signal.
prsSignalRTC_COMP1	RTC_COMP1 signal.
prsSignalBURTC_COMP	BURTC compare Signal.
prsSignalBURTC_OF	BURTC overflow Signal.
prsSignalACMP0_OUT	ACMP0 Signal.
prsSignalACMP1_OUT	ACMP1 output Signal.
prsSignalLESENSE_SCANRES0	LESENSE_SCANRES0 Signal.
prsSignalLESENSE_SCANRES1	LESENSE_SCANRES1 Signal.
prsSignalLESENSE_SCANRES2	LESENSE_SCANRES2 Signal.
prsSignalLESENSE_SCANRES3	LESENSE_SCANRES3 Signal.
prsSignalLESENSE_SCANRES4	LESENSE_SCANRES4 Signal.
prsSignalLESENSE_SCANRES5	LESENSE_SCANRES5 Signal.
prsSignalLESENSE_SCANRES6	LESENSE_SCANRES6 Signal.
prsSignalLESENSE_SCANRES7	LESENSE_SCANRES7 Signal.
prsSignalLESENSE_SCANRES8	LESENSE_SCANRES8 Signal.
prsSignalLESENSE_SCANRES9	LESENSE_SCANRES9 Signal.
prsSignalLESENSE_SCANRES10	LESENSE_SCANRES10 Signal.
prsSignalLESENSE_SCANRES11	LESENSE_SCANRES11 Signal.
prsSignalLESENSE_SCANRES12	LESENSE_SCANRES12 Signal.
prsSignalLESENSE_SCANRES13	LESENSE_SCANRES13 Signal.
prsSignalLESENSE_SCANRES14	LESENSE_SCANRES14 Signal.
prsSignalLESENSE_SCANRES15	LESENSE_SCANRES15 Signal.
prsSignalLESENSE_DEC0	LESENSE_DEC0 Signal.
prsSignalLESENSE_DEC1	LESENSE_DEC1 Signal.
prsSignalLESENSE_DEC2	LESENSE_DEC2 Signal.
prsSignalUSART1_TXC	USART1 TX complete Signal.
prsSignalUSART1_RXDATAV	USART1 RX data available Signal.
prsSignalUSART2_TXC	USART2 TX complete Signal.
prsSignalUSART2_RXDATAV	USART2 RX data available Signal.
prsSignalUART0_TXC	UART0 TX complete Signal.
prsSignalUART0_RXDATAV	UART0 RX data available Signal.
prsSignalUART1_TXC	UART1 TX complete Signal.
prsSignalUART1_RXDATAV	UART1 RX data available Signal.
prsSignalGPIO_PIN0	GPIO Pin 0 Signal.
prsSignalGPIO_PIN1	GPIO Pin 1 Signal.
prsSignalGPIO_PIN2	GPIO Pin 2 Signal.
prsSignalGPIO_PIN3	GPIO Pin 3 Signal.
prsSignalGPIO_PIN4	GPIO Pin 4 Signal.
prsSignalGPIO_PIN5	GPIO Pin 5 Signal.
prsSignalGPIO_PIN6	GPIO Pin 6 Signal.
prsSignalGPIO_PIN7	GPIO Pin 7 Signal.
prsSignalGPIO_PIN8	GPIO Pin 8 Signal.
prsSignalGPIO_PIN9	GPIO Pin 9 Signal.
prsSignalGPIO_PIN10	GPIO Pin 10 Signal.
prsSignalGPIO_PIN11	GPIO Pin 11 Signal.
prsSignalGPIO_PIN12	GPIO Pin 12 Signal.
prsSignalGPIO_PIN13	GPIO Pin 13 Signal.
prsSignalGPIO_PIN14	GPIO Pin 14 Signal.
prsSignalGPIO_PIN15	GPIO Pin 15 Signal.

Function Documentation#

PRS_LevelSet#

void PRS_LevelSet (uint32_t level, uint32_t mask)

Set level control bit for one or more channels.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	level	Level to use for channels indicated by `mask`. Use logical OR combination of PRS_SWLEVEL_CHnLEVEL defines for channels to set high level, otherwise 0.
uint32_t	[in]	mask	Mask indicating which channels to set level for. Use logical OR combination of PRS_SWLEVEL_CHnLEVEL defines.

The level value for a channel is XORed with both the pulse possibly issued by PRS_PulseTrigger() and the PRS input signal selected for the channel(s).

PRS_LevelGet#

uint32_t PRS_LevelGet (void )

Get level control bit for all channels.

Parameters

Type	Direction	Argument Name	Description
void	N/A

Returns

The current software level configuration.

PRS_PulseTrigger#

void PRS_PulseTrigger (uint32_t channels)

Trigger a high pulse (one HFPERCLK) for one or more channels.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	channels	Logical ORed combination of channels to trigger a pulse for. Use PRS_SWPULSE_CHnPULSE defines.

Setting a bit for a channel causes the bit in the register to remain high for one HFPERCLK cycle. Pulse is XORed with both the corresponding bit in PRS SWLEVEL register and the PRS input signal selected for the channel(s).

PRS_ChannelLevelSet#

void PRS_ChannelLevelSet (unsigned int ch, bool level)

Set the PRS channel level for one asynchronous PRS channel.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	PRS channel number.
bool	[in]	level	true to set the level high (1) and false to set the level low (0).

PRS_ChannelPulse#

void PRS_ChannelPulse (unsigned int ch)

Trigger a pulse on one PRS channel.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	PRS channel number.

PRS_SourceSignalSet#

void PRS_SourceSignalSet (unsigned int ch, uint32_t source, uint32_t signal, PRS_Edge_TypeDef edge)

Set a source and signal for a channel.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	A channel to define the signal and source for.
uint32_t	[in]	source	A source to select for the channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
uint32_t	[in]	signal	A signal (for selected `source`) to use. Use one of PRS_CH_CTRL_SIGSEL_x defines.
PRS_Edge_TypeDef	[in]	edge	An edge (for selected source/signal) to generate the pulse for.

PRS_SourceAsyncSignalSet#

void PRS_SourceAsyncSignalSet (unsigned int ch, uint32_t source, uint32_t signal)

Set the source and asynchronous signal for a channel.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	A channel to define the source and asynchronous signal for.
uint32_t	[in]	source	A source to select for the channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
uint32_t	[in]	signal	An asynchronous signal (for selected `source`) to use. Use one of the PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.

Asynchronous reflexes are not clocked on HFPERCLK and can be used even in EM2/EM3. There is a limitation to reflexes operating in asynchronous mode in that they can only be used by a subset of the reflex consumers. See the PRS chapter in the reference manual for the complete list of supported asynchronous signals and consumers.

Note

This function is not supported on EFM32GxxxFyyy parts. In asynchronous mode, the edge detector only works in EM0 and should not be used. The EDSEL parameter in PRS_CHx_CTRL register is set to 0 (OFF) by default.

PRS_GpioOutputLocation#

void PRS_GpioOutputLocation (unsigned int ch, unsigned int location)

Send the output of a PRS channel to a GPIO pin.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	PRS channel number.
unsigned int	[in]	location	PRS routing location.

This function is used to send the output of a PRS channel to a GPIO pin. Note that there are certain restrictions to where a PRS channel can be routed. Consult the datasheet of the device to see if a channel can be routed to the requested GPIO pin.

PRS_GetFreeChannel#

int PRS_GetFreeChannel (PRS_ChType_t type)

Search for the first free PRS channel.

Parameters

Type	Direction	Argument Name	Description
PRS_ChType_t	[in]	type	PRS channel type. This can be either prsTypeAsync or prsTypeSync.

Returns

Channel number >= 0 if an unused PRS channel was found. If no free PRS channel was found then -1 is returned.

PRS_Reset#

void PRS_Reset (void )

Reset all PRS channels.

Parameters

Type	Direction	Argument Name	Description
void	N/A

This function will reset all the PRS channel configuration.

PRS_ConnectSignal#

void PRS_ConnectSignal (unsigned int ch, PRS_ChType_t type, PRS_Signal_t signal)

Connect a PRS signal to a channel.

Parameters

Type	Direction	Argument Name	Description
unsigned int	[in]	ch	PRS channel number.
PRS_ChType_t	[in]	type	PRS channel type. This can be either prsTypeAsync or prsTypeSync.
PRS_Signal_t	[in]	signal	This is the PRS signal that should be placed on the channel.

This function will make the PRS signal available on the specific channel. Only a single PRS signal can be connected to any given channel.