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pln-ppb-test: implement read-id
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Dec 2023 00:04:18 +0000
parents 3229940734e5
children
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#include "ns16550.h"

@ extra serial I/O functions for loadagent binary operations

	.text
	.code	32
	.globl	serial_out_if_empty
serial_out_if_empty:
	ldr	r1, =uart_base
	ldr	r2, [r1]
	ldrb	r3, [r2, #NS16550_LSR]
	tst	r3, #NS16550_LSR_THRE
	strneb	r0, [r2, #NS16550_THR]
	bx	lr