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diff gsm-fw/lldbg/serio.S @ 865:f5affe83ba2d

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lldbg hack (poor girl's substitute for JTAG) implemented
author Space Falcon <falcon@ivan.Harhan.ORG>
date Fri, 15 May 2015 00:02:03 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gsm-fw/lldbg/serio.S	Fri May 15 00:02:03 2015 +0000
@@ -0,0 +1,34 @@
+#include "../include/config.h"
+#include "ns16550.h"
+
+/* this module implements the elementary serial I/O operations */
+
+	.text
+	.code	32
+	.globl	lldbg_serial_out
+lldbg_serial_out:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+1:	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_THRE
+	beq	1b
+	strb	r0, [r2, #NS16550_THR]
+	bx	lr
+
+	.globl	lldbg_serial_in_poll
+lldbg_serial_in_poll:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_DR
+	ldrneb	r0, [r2, #NS16550_RBR]
+	mvneq	r0, #0
+	bx	lr
+
+#if 0	// not needed currently
+	.globl	lldbg_serial_flush
+lldbg_serial_flush:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+1:	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_TEMP
+	beq	1b
+	bx	lr
+#endif