Enum SlaveSelect

pub enum SlaveSelect {
    Software,
    HardwareOutEnable,
    HardwareOutDisable,
}

Used for managing NSS / CS pin. Sets CR1 register, SSM field. On H7, sets CFG2 register, SSOE field.

Variants

Software

In this configuration, slave select information is driven internally by the SSI bit value in register SPIx_CR1. The external NSS pin is free for other application uses.

HardwareOutEnable

This configuration is only used when the MCU is set as master. The NSS pin is managed by the hardware. The NSS signal is driven low as soon as the SPI is enabled in master mode (SPE=1), and is kept low until the SPI is disabled (SPE =0). A pulse can be generated between continuous communications if NSS pulse mode is activated (NSSP=1). The SPI cannot work in multimaster configuration with this NSS setting.

HardwareOutDisable

If the microcontroller is acting as the master on the bus, this configuration allows multimaster capability. If the NSS pin is pulled low in this mode, the SPI enters master mode fault state and the device is automatically reconfigured in slave mode. In slave mode, the NSS pin works as a standard “chip select” input and the slave is selected while NSS line is at low level.

Trait Implementations

impl Clone for SlaveSelect

fn clone(&self) -> SlaveSelect

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl PartialEq for SlaveSelect

fn eq(&self, other: &SlaveSelect) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SlaveSelect

impl StructuralPartialEq for SlaveSelect