PRS - Peripheral Reflex System

Description

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.

Functions

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.
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.

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.

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,
prsSignalUSART0_TXC = PRS_USART0_TXC,
prsSignalUSART0_RXDATAV = PRS_USART0_RXDATAV,
prsSignalUSART0_IRTX = PRS_USART0_IRTX,
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,
prsSignalUSB_SOF = PRS_USB_SOF,
prsSignalUSB_SOFSR = PRS_USB_SOFSR,
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.

Function Documentation

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
[in] ch A channel to define the signal and source for.
[in] source A source to select for the channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
[in] signal A signal (for selected source ) to use. Use one of PRS_CH_CTRL_SIGSEL_x defines.
[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.

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.
Parameters
[in] ch A channel to define the source and asynchronous signal for.
[in] source A source to select for the channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
[in] signal An asynchronous signal (for selected source ) to use. Use one of the PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.

PRS_GpioOutputLocation()

void PRS_GpioOutputLocation ( unsigned int ch,
unsigned int location
)

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

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.

Parameters
[in] ch PRS channel number.
[in] location PRS routing location.

PRS_GetFreeChannel()

int PRS_GetFreeChannel ( PRS_ChType_t type )

Search for the first free PRS channel.

Parameters
[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.

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.

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

Parameters
[in] ch PRS channel number.
[in] type PRS channel type. This can be either prsTypeAsync or prsTypeSync .
[in] signal This is the PRS signal that should be placed on the channel.

PRS_LevelSet()

void PRS_LevelSet ( uint32_t level,
uint32_t mask
)
inline

Set level control bit for one or more channels.

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).

Parameters
[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.
[in] mask Mask indicating which channels to set level for. Use logical OR combination of PRS_SWLEVEL_CHnLEVEL defines.

PRS_LevelGet()

uint32_t PRS_LevelGet ( void )
inline

Get level control bit for all channels.

Returns
The current software level configuration.

PRS_PulseTrigger()

void PRS_PulseTrigger ( uint32_t channels )
inline

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

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).

Parameters
[in] channels Logical ORed combination of channels to trigger a pulse for. Use PRS_SWPULSE_CHnPULSE defines.

PRS_ChannelLevelSet()

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void PRS_ChannelLevelSet ( unsigned int ch,