Asynchronous Serial Interface (UART0)

These functions allow direct access to the Raspberry Pi's UART (RS-232) controller without using the regular Linux device driver. More...

Functions
static void	uart_init (unsigned int bitrate)
	Configure UART hardware for given bit rate. 115200 bit/s is the fastest speed available.
static int	uart_poll (int num)
	Return true if at least num bytes are available in the receive FIFO. Only guaranteed to work correctly with num == 1. Larger values may return true even if less bytes (but at least one) are available.
static uint8_t	uart_read (void)
	Read a single byte received via UART. Block if FIFO is currently empty.
static void	uart_write (uint8_t data)
	Send data via UART. Block if FIFO is currently full.
static void	uart_flush ()
	Block until transmit FIFO is empty.

Detailed Description

These functions allow direct access to the Raspberry Pi's UART (RS-232) controller without using the regular Linux device driver.

This is useful when running under Xenomai or a similar real-time OS.

Declared in raspi/uart.h.