UART Hardware Functions

These UART functions are implemented differently for different UART types. More...

Functions
syscall	kgetc (device *devptr)
syscall	kputc (uchar c, device *devptr)
interrupt	uartInterrupt (void)

Detailed Description

These UART functions are implemented differently for different UART types.

Function Documentation

syscall kgetc

(

device *

devptr

)

Synchronously read a character from a UART. This blocks until a character is available. The interrupt handler is not used.

Parameters

devptr

Pointer to the device table entry for a UART.

Returns

The character read from the UART as an unsigned char cast to an int.

syscall kputc	(	uchar	c,
		device *	devptr
	)

Synchronously write a character to a UART. This blocks until the character has been written to the hardware. The interrupt handler is not used.

Parameters

c	The character to write.
devptr	Pointer to the device table entry for a UART.

Returns

The character written to the UART as an unsigned char cast to an int.

interrupt uartInterrupt

(

void

)

Handle an interrupt request from a PL011 UART.