Struct stm32_metapac::lpdma::regs::ChTr2

#[repr(transparent)]
pub struct ChTr2(pub u32);

Expand description

LPDMA channel 10 transfer register 2

Tuple Fields§

§0: u32

Implementations§

§

impl ChTr2

pub const fn reqsel(&self) -> u8

LPDMA hardware request selection. These bits are ignored if channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer). Else, the selected hardware request is internally taken into account as per . The user must not assign a same input hardware request (same REQSEL[6:0] value) to different active LPDMA channels (CH[x].CR.EN = 1 and CH[x].TR2.SWREQ = 0 for these channels). LPDMA is not intended to hardware support the case of simultaneous enabled channels incorrectly configured with a same hardware peripheral request signal, and there is no user setting error reporting.

pub fn set_reqsel(&mut self, val: u8)

LPDMA hardware request selection. These bits are ignored if channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer). Else, the selected hardware request is internally taken into account as per . The user must not assign a same input hardware request (same REQSEL[6:0] value) to different active LPDMA channels (CH[x].CR.EN = 1 and CH[x].TR2.SWREQ = 0 for these channels). LPDMA is not intended to hardware support the case of simultaneous enabled channels incorrectly configured with a same hardware peripheral request signal, and there is no user setting error reporting.

pub const fn swreq(&self) -> Swreq

software request. This bit is internally taken into account when CH[x].CR.EN is asserted.

pub fn set_swreq(&mut self, val: Swreq)

software request. This bit is internally taken into account when CH[x].CR.EN is asserted.

pub const fn dreq(&self) -> Dreq

destination hardware request. This bit is ignored if channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer). Else: Note:

pub fn set_dreq(&mut self, val: Dreq)

destination hardware request. This bit is ignored if channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer). Else: Note:

pub const fn breq(&self) -> Breq

Block hardware request. If the channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer), this bit is ignored. Else:

pub fn set_breq(&mut self, val: Breq)

Block hardware request. If the channel x is activated (CH[x].CR.EN asserted) with SWREQ = 1 (software request for a memory-to-memory transfer), this bit is ignored. Else:

pub const fn trigm(&self) -> Trigm

trigger mode. These bits define the transfer granularity for its conditioning by the trigger. If the channel x is enabled (CH[x].CR.EN asserted) with TRIGPOL[1:0] = 00 or 11, these TRIGM[1:0] bits are ignored. Else, a LPDMA transfer is conditioned by at least one trigger hit: first burst read of a 2D/repeated block transfer is conditioned by one hit trigger. – If the peripheral is programmed as a source (DREQ = 0) of the LLI data transfer, each programmed burst read is conditioned. – If the peripheral is programmed as a destination (DREQ = 1) of the LLI data transfer, each programmed burst write is conditioned. The first memory burst read of a (possibly 2D/repeated) block, also named as the first ready FIFO-based source burst, is gated by the occurrence of both the hardware request and the first trigger hit. The LPDMA monitoring of a trigger for channel x is started when the channel is enabled/loaded with a new active trigger configuration: rising or falling edge on a selected trigger (TRIGPOL[1:0] = 01 or respectively TRIGPOL[1:0] = 10). The monitoring of this trigger is kept active during the triggered and uncompleted (data or link) transfer; and if a new trigger is detected then, this hit is internally memorized to grant the next transfer, as long as the defined rising or falling edge is not modified, and the TRIGSEL[5:0] is not modified, and the channel is enabled. Transferring a next LLIn+1 that updates the CH[x].TR2 with a new value for any of TRIGSEL[5:0] or TRIGPOL[1:0], resets the monitoring, trashing the memorized hit of the formerly defined LLIn trigger. After a first new trigger hitn+1 is memorized, if another second trigger hitn+2 is detected and if the hitn triggered transfer is still not completed, hitn+2 is lost and not memorized.memorized. A trigger overrun flag is reported (CH[x].SR.TOF =1 ), and an interrupt is generated if enabled (CH[x].CR.TOIE = 1). The channel is not automatically disabled by hardware due to a trigger overrun. Note: When the source block size is not a multiple of the source burst size and is a multiple of the source data width, then the last programmed source burst is not completed and is internally shorten to match the block size. In this case, if TRIGM[1:0] = 11 and (SWREQ =1 or (SWREQ = 0 and DREQ =0 )), the shortened burst transfer (by singles or/and by bursts of lower length) is conditioned once by the trigger. When the programmed destination burst is internally shortened by singles or/and by bursts of lower length (versus FIFO size, versus block size, 1-Kbyte boundary address crossing): if the trigger is conditioning the programmed destination burst (if TRIGM[1:0] = 11 and SWREQ = 0 and DREQ = 1), this shortened destination burst transfer is conditioned once by the trigger.

pub fn set_trigm(&mut self, val: Trigm)

trigger mode. These bits define the transfer granularity for its conditioning by the trigger. If the channel x is enabled (CH[x].CR.EN asserted) with TRIGPOL[1:0] = 00 or 11, these TRIGM[1:0] bits are ignored. Else, a LPDMA transfer is conditioned by at least one trigger hit: first burst read of a 2D/repeated block transfer is conditioned by one hit trigger. – If the peripheral is programmed as a source (DREQ = 0) of the LLI data transfer, each programmed burst read is conditioned. – If the peripheral is programmed as a destination (DREQ = 1) of the LLI data transfer, each programmed burst write is conditioned. The first memory burst read of a (possibly 2D/repeated) block, also named as the first ready FIFO-based source burst, is gated by the occurrence of both the hardware request and the first trigger hit. The LPDMA monitoring of a trigger for channel x is started when the channel is enabled/loaded with a new active trigger configuration: rising or falling edge on a selected trigger (TRIGPOL[1:0] = 01 or respectively TRIGPOL[1:0] = 10). The monitoring of this trigger is kept active during the triggered and uncompleted (data or link) transfer; and if a new trigger is detected then, this hit is internally memorized to grant the next transfer, as long as the defined rising or falling edge is not modified, and the TRIGSEL[5:0] is not modified, and the channel is enabled. Transferring a next LLIn+1 that updates the CH[x].TR2 with a new value for any of TRIGSEL[5:0] or TRIGPOL[1:0], resets the monitoring, trashing the memorized hit of the formerly defined LLIn trigger. After a first new trigger hitn+1 is memorized, if another second trigger hitn+2 is detected and if the hitn triggered transfer is still not completed, hitn+2 is lost and not memorized.memorized. A trigger overrun flag is reported (CH[x].SR.TOF =1 ), and an interrupt is generated if enabled (CH[x].CR.TOIE = 1). The channel is not automatically disabled by hardware due to a trigger overrun. Note: When the source block size is not a multiple of the source burst size and is a multiple of the source data width, then the last programmed source burst is not completed and is internally shorten to match the block size. In this case, if TRIGM[1:0] = 11 and (SWREQ =1 or (SWREQ = 0 and DREQ =0 )), the shortened burst transfer (by singles or/and by bursts of lower length) is conditioned once by the trigger. When the programmed destination burst is internally shortened by singles or/and by bursts of lower length (versus FIFO size, versus block size, 1-Kbyte boundary address crossing): if the trigger is conditioning the programmed destination burst (if TRIGM[1:0] = 11 and SWREQ = 0 and DREQ = 1), this shortened destination burst transfer is conditioned once by the trigger.

pub const fn trigsel(&self) -> u8

trigger event input selection. These bits select the trigger event input of the LPDMA transfer (as per ), with an active trigger event if TRIGPOL[1:0] ≠ 00.

pub fn set_trigsel(&mut self, val: u8)

trigger event input selection. These bits select the trigger event input of the LPDMA transfer (as per ), with an active trigger event if TRIGPOL[1:0] ≠ 00.

pub const fn trigpol(&self) -> Trigpol

trigger event polarity. These bits define the polarity of the selected trigger event input defined by TRIGSEL[5:0].

pub fn set_trigpol(&mut self, val: Trigpol)

trigger event polarity. These bits define the polarity of the selected trigger event input defined by TRIGSEL[5:0].

pub const fn tcem(&self) -> Tcem

transfer complete event mode. These bits define the transfer granularity for the transfer complete and half transfer complete events generation. Note: If the initial LLI0 data transfer is null/void (directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] = 0), then neither the complete transfer event nor the half transfer event is generated. Note: If the initial LLI0 data transfer is null/void (directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] = 0), then neither the complete transfer event nor the half transfer event is generated. Note: If the initial LLI0 data transfer is null/void (i.e. directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] =0 ), then the half transfer event is not generated, and the transfer complete event is generated when is completed the loading of the LLI1.

pub fn set_tcem(&mut self, val: Tcem)

transfer complete event mode. These bits define the transfer granularity for the transfer complete and half transfer complete events generation. Note: If the initial LLI0 data transfer is null/void (directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] = 0), then neither the complete transfer event nor the half transfer event is generated. Note: If the initial LLI0 data transfer is null/void (directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] = 0), then neither the complete transfer event nor the half transfer event is generated. Note: If the initial LLI0 data transfer is null/void (i.e. directly programmed by the internal register file with CH[x].BR1.BNDT[15:0] =0 ), then the half transfer event is not generated, and the transfer complete event is generated when is completed the loading of the LLI1.