From 733a45d82e84de894be0c3d29b3305219827f448 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 2 Dec 2021 23:17:41 -0700
Subject: Initial Commit

---
 src/uart.S | 112 +++++++++++++++++++++++++++++++------------------------------
 1 file changed, 57 insertions(+), 55 deletions(-)

(limited to 'src/uart.S')

diff --git a/src/uart.S b/src/uart.S
index 94ce458..0864b7e 100644
--- a/src/uart.S
+++ b/src/uart.S
@@ -2,72 +2,74 @@
 
 .globl uart_init
 uart_init:
-    //*UART0_IMSC = 1 << 4;
-    mov r2, #0x1038
-    movt r2, #0x3F20
-    mov r3, #0b10000
-    str r3, [r2]
-    //*IRQ_ENABLE2 = 1 << 25;
-    mov r2, #0xB214
-    movt r2, #0x3F00
-    mov r3, #0
-    movt r3, #0b1000000000
-    str r3, [r2]
-    //*GPU_INTERRUPTS_ROUTING = 0x00;
-    mov r2, #0x000C
-    movt r2, #0x4000
-    eor r3, r3
-    str r3, [r2]
-    bx lr
+	//*UART0_IMSC = 1 << 4;
+	// IGNORE OVERRUN
+	mov r2, #0x1038
+	movt r2, #0x3F20
+	mov r3, #0b10000
+	str r3, [r2]
+	//*IRQ_ENABLE2 = 1 << 25;
+	mov r2, #0xB214
+	movt r2, #0x3F00
+	mov r3, #0
+	movt r3, #0b1000000000
+	str r3, [r2]
+	//*GPU_INTERRUPTS_ROUTING = 0x00;
+	// Route GPU interrupts to Core0
+	mov r2, #0x000C
+	movt r2, #0x4000
+	eor r3, r3
+	str r3, [r2]
+	bx lr
 
 .globl uart_char
 uart_char:
-    mov r2, #0x1000
-    movt r2, #0x3f20
+	mov r2, #0x1000
+	movt r2, #0x3f20
 uart_char.loop:
-    ldr r3, [r2, #24]
-    tst r3, #0b100000
-    bne uart_char.loop
-    str r0, [r2]
-    bx lr
+	ldr r3, [r2, #24]
+	tst r3, #0b100000
+	bne uart_char.loop
+	str r0, [r2]
+	bx lr
 
 .globl uart_string
 uart_string:
-    push    {r4, lr}
-    mov     r4, r0
-    ldrb    r0, [r0]
-    cmp     r0, #0
-    popeq   {r4, pc}
+	push    {r4, lr}
+	mov     r4, r0
+	ldrb    r0, [r0]
+	cmp     r0, #0
+	popeq   {r4, pc}
 uart_string.loop:
-    bl      uart_char
-    ldrb    r0, [r4, #1]!
-    cmp     r0, #0
-    bne     uart_string.loop
-    pop     {r4, pc}
+	bl      uart_char
+	ldrb    r0, [r4, #1]!
+	cmp     r0, #0
+	bne     uart_string.loop
+	pop     {r4, pc}
 
 .globl uart_hex
 uart_hex:
-    push {r4, lr}
-    mov r2, #0x1000
-    movt r2, #0x3f20
+	push {r4, lr}
+	mov r2, #0x1000
+	movt r2, #0x3f20
 uart_hex.loop:
-    ldr r3, [r2, #24]
-    tst r3, #0b100000
-    bne uart_hex.loop
-    mov r3, #7
+	ldr r3, [r2, #24]
+	tst r3, #0b100000
+	bne uart_hex.loop
+	mov r3, #7
 uart_hex.hloop:
-    mov r1, r0
-    asr r1, r3
-    asr r1, r3
-    asr r1, r3
-    asr r1, r3
-    and r1, #0xf
-    add r1, #0x30
-    cmp r1, #0x3A
-    blt uart_hex.print
-    add r1, #7
+	mov r1, r0
+	asr r1, r3
+	asr r1, r3
+	asr r1, r3
+	asr r1, r3
+	and r1, #0xf
+	add r1, #0x30
+	cmp r1, #0x3A
+	blt uart_hex.print
+	add r1, #7
 uart_hex.print:
-    str r1, [r2]
-    subs r3, #1
-    bge uart_hex.hloop
-    pop {r4, pc}
+	str r1, [r2]
+	subs r3, #1
+	bge uart_hex.hloop
+	pop {r4, pc}
-- 
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