PRS
EMLIB

Detailed 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.

Macros

#define PRS_ASYNC_CHAN_COUNT PRS_CHAN_COUNT
#define PRS_ASYNC_SUPPORTED 1
#define PRS_SYNC_CHAN_COUNT PRS_CHAN_COUNT
#define PRS_USART0_RXDATA PRS_USART0_RXDATAV
#define PRS_USART1_RXDATA PRS_USART1_RXDATAV

Enumerations

enum PRS_ChType_t {
prsTypeAsync ,
prsTypeSync
}
enum PRS_Edge_TypeDef {
prsEdgeOff ,
prsEdgePos ,
prsEdgeNeg ,
prsEdgeBoth
}
enum PRS_Signal_t {
prsSignalNone = 0x0,
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,
prsSignalLETIMER0_CH0 = PRS_LETIMER0_CH0,
prsSignalLETIMER0_CH1 = PRS_LETIMER0_CH1,
prsSignalRTCC_CCV0 = PRS_RTCC_CCV0,
prsSignalRTCC_CCV1 = PRS_RTCC_CCV1,
prsSignalRTCC_CCV2 = PRS_RTCC_CCV2,
prsSignalACMP0_OUT = PRS_ACMP0_OUT,
prsSignalACMP1_OUT = PRS_ACMP1_OUT,
prsSignalUSART0_IRTX = PRS_USART0_IRTX,
prsSignalUSART0_TXC = PRS_USART0_TXC,
prsSignalUSART0_RXDATA = PRS_USART0_RXDATA,
prsSignalUSART0_RTS = PRS_USART0_RTS,
prsSignalUSART0_TX = PRS_USART0_TX,
prsSignalUSART0_CS = PRS_USART0_CS,
prsSignalUSART1_TXC = PRS_USART1_TXC,
prsSignalUSART1_RXDATA = PRS_USART1_RXDATA,
prsSignalUSART1_RTS = PRS_USART1_RTS,
prsSignalUSART1_TX = PRS_USART1_TX,
prsSignalUSART1_CS = PRS_USART1_CS,
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
}

Functions

__STATIC_INLINE void PRS_ChannelLevelSet (unsigned int ch, bool level)
Set the PRS channel level for one asynchronous PRS channel.
__STATIC_INLINE void PRS_ChannelPulse (unsigned int ch)
Trigger a pulse on one PRS channel.
__STATIC_INLINE bool PRS_ChannelValue (unsigned int ch, PRS_ChType_t type)
Get the PRS channel value for a single channel.
void PRS_ConnectSignal (unsigned int ch, PRS_ChType_t type, PRS_Signal_t signal)
Connect a PRS signal to a channel.
int PRS_GetFreeChannel ( PRS_ChType_t type)
Search for the first free PRS channel.
void PRS_GpioOutputLocation (unsigned int ch, unsigned int location)
Send the output of a PRS channel to a GPIO pin.
__STATIC_INLINE uint32_t PRS_LevelGet (void)
Get level control bit for all channels.
__STATIC_INLINE void PRS_LevelSet (uint32_t level, uint32_t mask)
Set level control bit for one or more channels.
__STATIC_INLINE void PRS_PulseTrigger (uint32_t channels)
Trigger a high pulse (one HFPERCLK) for one or more channels.
void PRS_Reset (void)
Reset all PRS channels.
void PRS_SourceAsyncSignalSet (unsigned int ch, uint32_t source, uint32_t signal)
Set the source and asynchronous signal for a 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.
__STATIC_INLINE uint32_t PRS_Values ( PRS_ChType_t type)
Get the PRS channel values for all channels.

Enumeration Type Documentation

enum PRS_ChType_t

PRS Channel type.

Enumerator
prsTypeAsync

Asynchronous channel type.

prsTypeSync

Synchronous channel type.

Definition at line 98 of file em_prs.h .

enum 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.

Definition at line 104 of file em_prs.h .

enum PRS_Signal_t

PRS Signal.

Enumerator
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.

prsSignalLETIMER0_CH0

LETIMER0 channel 0 Signal.

prsSignalLETIMER0_CH1

LETIMER0 channel 1 Signal.

prsSignalRTCC_CCV0

RTCC capture/compare channel 0 Signal.

prsSignalRTCC_CCV1

RTCC capture/compare channel 1 Signal.

prsSignalRTCC_CCV2

RTCC capture/compare channel 2 Signal.

prsSignalACMP0_OUT

ACMP0 Signal.

prsSignalACMP1_OUT

ACMP1 output Signal.

prsSignalUSART0_IRTX

USART0 IR tx Signal.

prsSignalUSART0_TXC

USART0 tx complete Signal.

prsSignalUSART0_RXDATA

USART0 rx data available Signal.

prsSignalUSART0_RTS

USART0 RTS Signal.

prsSignalUSART0_TX

USART0 tx Signal.

prsSignalUSART0_CS

USART0 chip select Signal.

prsSignalUSART1_TXC

USART1 tx complete Signal.

prsSignalUSART1_RXDATA

USART1 rx data available Signal.

prsSignalUSART1_RTS

USART1 RTS Signal.

prsSignalUSART1_TX

USART1 tx Signal.

prsSignalUSART1_CS

USART1 chip select 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.

Definition at line 134 of file em_prs.h .

Function Documentation

__STATIC_INLINE void PRS_ChannelLevelSet ( unsigned int ch,
bool level
)

Set the PRS channel level for one asynchronous PRS channel.

Parameters
[in] ch PRS channel number.
[in] level true to set the level high (1) and false to set the level low (0).

Definition at line 435 of file em_prs.h .

References PRS_LevelSet() .

__STATIC_INLINE void PRS_ChannelPulse ( unsigned int ch )

Trigger a pulse on one PRS channel.

Parameters
[in] ch PRS channel number.

Definition at line 447 of file em_prs.h .

References PRS_PulseTrigger() .

__STATIC_INLINE bool PRS_ChannelValue ( unsigned int ch,
PRS_ChType_t type
)

Get the PRS channel value for a single channel.

Parameters
[in] ch PRS channel number.
[in] type PRS channel type. This can be either prsTypeAsync or prsTypeSync .
Returns
The current PRS channel output value. This is either 0 or 1.

Definition at line 396 of file em_prs.h .

References PRS_Values() .

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.

Definition at line 382 of file em_prs.c .

References prsTypeAsync .

Referenced by PRS_SourceAsyncSignalSet() .

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.

Definition at line 315 of file em_prs.c .

References prsTypeAsync .

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] loc PRS routing location.

Definition at line 282 of file em_prs.c .

__STATIC_INLINE uint32_t PRS_LevelGet ( void )

Get level control bit for all channels.

Returns
The current software level configuration.

Definition at line 347 of file em_prs.h .

__STATIC_INLINE void PRS_LevelSet ( uint32_t level,
uint32_t mask
)

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.

Definition at line 331 of file em_prs.h .

Referenced by PRS_ChannelLevelSet() .

__STATIC_INLINE void PRS_PulseTrigger ( uint32_t channels )

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.

Definition at line 416 of file em_prs.h .

Referenced by PRS_ChannelPulse() .

void PRS_Reset ( void )

Reset all PRS channels.

This function will reset all the PRS channel configuration.

Definition at line 344 of file em_prs.c .

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.

Definition at line 257 of file em_prs.c .

References PRS_ConnectSignal() , and prsTypeAsync .

Referenced by adcDeInit() , ezradio_hal_GpioInit() , MIC_deInit() , and MIC_init() .

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.

Definition at line 210 of file em_prs.c .

__STATIC_INLINE uint32_t PRS_Values ( PRS_ChType_t type )

Get the PRS channel values for all channels.

Parameters
[in] type PRS channel type. This can be either prsTypeAsync or prsTypeSync .
Returns
The current PRS channel output values for all channels as a bitset.

Definition at line 368 of file em_prs.h .

References prsTypeAsync .

Referenced by PRS_ChannelValue() .