38.1.5.1 usart_async_init

int32_t usart_async_init(
    struct usart_async_descriptor *const descr,
    void *const hw,
    uint8_t *const rx_buffer,
    const uint16_t rx_buffer_length,
    void *const func
)

This function initializes the given I/O descriptor to be used as USART interface descriptor. It checks if the given hardware is not initialized and if the given hardware is permitted to be initialized.

Parameters

descr

Type: struct usart_async_descriptor Struct *const

A USART descriptor which is used to communicate via the USART

hw

Type: void *const

The pointer to the hardware instance

rx_buffer

Type: uint8_t *const

An RX buffer

rx_buffer_length

Type: const uint16_t

The length of the buffer above

func

Type: void *const

The pointer to a set of function pointers

Returns

Type: int32_t

Initialization status.

-1

Passed parameters were invalid or the interface is already initialized

0

The initialization is completed successfully