FreeCalypso > hg > freecalypso-tools

diff target-utils/loadagent/serextra.S @ 648:3229940734e5

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loadagent: binary memload command implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Mar 2020 02:32:18 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/target-utils/loadagent/serextra.S	Mon Mar 02 02:32:18 2020 +0000
@@ -0,0 +1,14 @@
+#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