Struct lpc43xx::sdmmc::fifoth::W

pub struct W { /* fields omitted */ }

Value to write to the register

Methods

impl W

pub fn reset_value() -> W

Reset value of the register

pub unsafe fn bits(&mut self, bits: u32) -> &mut Self

Writes raw bits to the register

pub fn tx_wmark(&mut self) -> _TX_WMARKW

Bits 0:11 - FIFO threshold watermark level when transmitting data to card. When FIFO data count is less than or equal to this number, DMA/FIFO request is raised. If Interrupt is enabled, then interrupt occurs. During end of packet, request or interrupt is generated, regardless of threshold programming. In non-DMA mode, when transmit FIFO threshold (TXDR) interrupt is enabled, then interrupt is generated instead of DMA request. During end of packet, on last interrupt, host is responsible for filling FIFO with only required remaining bytes (not before FIFO is full or after CIU completes data transfers, because FIFO may not be empty). In DMA mode, at end of packet, if last transfer is less than burst size, DMA controller does single cycles until required bytes are transferred. 12 bits - 1 bit less than FIFO-count of status register, which is 13 bits. Limitation: TX_WMark >= 1; Recommended value: TX_WMARK = 16; (means less than or equal to FIFO_DEPTH/2).

pub fn rx_wmark(&mut self) -> _RX_WMARKW

Bits 16:27 - FIFO threshold watermark level when receiving data to card. When FIFO data count reaches greater than this number, DMA/FIFO request is raised. During end of packet, request is generated regardless of threshold programming in order to complete any remaining data. In non-DMA mode, when receiver FIFO threshold (RXDR) interrupt is enabled, then interrupt is generated instead of DMA request. During end of packet, interrupt is not generated if threshold programming is larger than any remaining data. It is responsibility of host to read remaining bytes on seeing Data Transfer Done interrupt. In DMA mode, at end of packet, even if remaining bytes are less than threshold, DMA request does single transfers to flush out any remaining bytes before Data Transfer Done interrupt is set. 12 bits - 1 bit less than FIFO-count of status register, which is 13 bits. Limitation: RX_WMark less than FIFO_DEPTH-2 Recommended: RX_WMARK = 15; (means greater than (FIFO_DEPTH/2) - 1) NOTE: In DMA mode during CCS time-out, the DMA does not generate the request at the end of packet, even if remaining bytes are less than threshold. In this case, there will be some data left in the FIFO. It is the responsibility of the application to reset the FIFO after the CCS time-out.

pub fn dma_mts(&mut self) -> _DMA_MTSW

Bits 28:30 - Burst size of multiple transaction; should be programmed same as DW-DMA controller multiple-transaction-size SRC/DEST_MSIZE.The units for transfers is the H_DATA_WIDTH parameter. A single transfer (dw_dma_single assertion in case of Non DW DMA interface) would be signalled based on this value. Value should be sub-multiple of (RX_WMark + 1) and (32 - TX_WMark). For example, if FIFO_DEPTH = 16, FDATA_WIDTH = H_DATA_WIDTH Allowed combinations for MSize and TX_WMark are: MSize = 1, TX_WMARK = 1-15 MSize = 4, TX_WMark = 8 MSize = 4, TX_WMark = 4 MSize = 4, TX_WMark = 12 MSize = 8, TX_WMark = 8 MSize = 8, TX_WMark = 4. Allowed combinations for MSize and RX_WMark are: MSize = 1, RX_WMARK = 0-14 MSize = 4, RX_WMark = 3 MSize = 4, RX_WMark = 7 MSize = 4, RX_WMark = 11 MSize = 8, RX_WMark = 7 MSize = 8, RX_WMark = 11 Recommended: MSize = 8, TX_WMark = 8, RX_WMark = 7

Trait Implementations