Espressif ESP32-S2 Programming Manual page 385

Chapter 2. API Reference
• LEN: Length of data received, since the SPI peripheral writes from the MSB, this helps to shift the
data to the LSB.
SPICOMMON_BUSFLAG_SLAVE
Initialize I/O in slave mode.
SPICOMMON_BUSFLAG_MASTER
Initialize I/O in master mode.
SPICOMMON_BUSFLAG_IOMUX_PINS
Check using iomux pins. Or indicates the pins are configured through the IO mux rather than GPIO matrix.
SPICOMMON_BUSFLAG_GPIO_PINS
Force the signals to be routed through GPIO matrix. Or indicates the pins are routed through the GPIO matrix.
SPICOMMON_BUSFLAG_SCLK
Check existing of SCLK pin. Or indicates CLK line initialized.
SPICOMMON_BUSFLAG_MISO
Check existing of MISO pin. Or indicates MISO line initialized.
SPICOMMON_BUSFLAG_MOSI
Check existing of MOSI pin. Or indicates MOSI line initialized.
SPICOMMON_BUSFLAG_DUAL
Check MOSI and MISO pins can output. Or indicates bus able to work under DIO mode.
SPICOMMON_BUSFLAG_WPHD
Check existing of WP and HD pins. Or indicates WP & HD pins initialized.
SPICOMMON_BUSFLAG_QUAD
Check existing of MOSI/MISO/WP/HD pins as output. Or indicates bus able to work under QIO mode.
SPICOMMON_BUSFLAG_IO4_IO7
Check existing of IO4~IO7 pins. Or indicates IO4~IO7 pins initialized.
SPICOMMON_BUSFLAG_OCTAL
Check existing of MOSI/MISO/WP/HD/SPIIO4/SPIIO5/SPIIO6/SPIIO7 pins as output. Or indicates bus
able to work under octal mode.
SPICOMMON_BUSFLAG_NATIVE_PINS
Type Definitions
typedef spi_common_dma_t
Enumerations
enum spi_common_dma_t
SPI DMA channels.
Values:
SPI_DMA_DISABLED = 0
Do not enable DMA for SPI.
SPI_DMA_CH_AUTO = 3
Enable DMA, channel is automatically selected by driver.
API Reference - SPI Master
Header File
• components/driver/include/driver/spi_master.h
Espressif Systems
spi_dma_chan_t
374
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