Module etm

Available on crate feature unstable only.

Event Task Matrix (ETM)

Overview

GPIO supports ETM function, that is, the ETM task of GPIO can be triggered by the ETM event of any peripheral, or the ETM task of any peripheral can be triggered by the ETM event of GPIO.

Configuration

The GPIO ETM provides several task channels. The ETM tasks that each task channel can receive are:

• SET: GPIO goes high when triggered
• CLEAR: GPIO goes low when triggered
• TOGGLE: GPIO toggle level when triggered.

GPIO has several event channels, and the ETM events that each event channel can generate are:

• RISE_EDGE: Indicates that the output signal of the corresponding GPIO has a rising edge
• FALL_EDGE: Indicates that the output signal of the corresponding GPIO has a falling edge
• ANY_EDGE: Indicates that the output signal of the corresponding GPIO is reversed

Examples

Toggle an LED When a Button is Pressed

let gpio_ext = Channels::new(peripherals.GPIO_SD);
let led_task = gpio_ext.channel0_task.toggle(
    led,
    OutputConfig {
        open_drain: false,
        pull: Pull::None,
        initial_state: Level::Low,
    },
);
let button_event = gpio_ext
    .channel0_event
    .falling_edge(button, InputConfig { pull: Pull::Down });

Structs

Channels

All the GPIO ETM channels

Event

Event for rising edge

EventChannel

An ETM controlled GPIO event

InputConfig

Configuration for an ETM controlled GPIO input pin

OutputConfig

Configuration for an ETM controlled GPIO output pin

Task

Task for set operation

TaskChannel

An ETM controlled GPIO task