EmbeddedOS API Reference

Initialize the HAL layer. Must be called before any peripheral API.

Shut down all HAL peripherals and release resources.

Block the calling task for at least ms milliseconds.

Return the number of milliseconds since HAL initialization.

Initialize a GPIO pin. Must be called before read/write/toggle.

Release a GPIO pin, resetting it to default state.

Set GPIO output pin high or low.

Read current state of a GPIO pin. Works for input and output pins.

Toggle a GPIO output pin (high→low or low→high).

Attach interrupt callback to a GPIO pin on specified edge(s).

Initialize a UART port with baud rate, parity, and stop bits.

Write bytes to a UART port. Blocks until all bytes are transmitted.

Read up to len bytes from UART. Returns when data available or timeout.

Disable UART port and release its pins.

Register async receive callback. Called from ISR context on each received byte.

Initialize SPI controller with given configuration.

Full-duplex SPI transfer. tx and rx may be NULL for half-duplex.

Write-only SPI transfer (MISO ignored).

Read-only SPI transfer (MOSI sends 0xFF).

Disable SPI controller and release pins.

Initialize I2C bus controller.

Write bytes to I2C device at 7-bit address.

Read bytes from I2C device at 7-bit address.

Write to a specific register of an I2C device (write reg byte then data).

Read from a specific register of an I2C device (write reg, then read).

Scan I2C bus and return addresses of responding devices.

Disable I2C controller and release pins.

Initialize a hardware timer with microsecond period and callback.

Start a previously initialized hardware timer.

Stop a running hardware timer. Callback will no longer fire.

Change the period of a running or stopped timer.

Release hardware timer resources.