rp2040

commit eb40b0e9cc98390ce77b8e4b5a3c302600444f77
parent ad8444f2be2735a2291e125f3d395d030138b092
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Mon, 26 Feb 2024 08:05:07 +0900

use Timer to fire interrupt

Diffstat:
M
ex3/boot2.s
 | 
4
++++
M
ex3/main.s
 | 
22
++++++++++++++--------

2 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/ex3/boot2.s b/ex3/boot2.s
@@ -3,6 +3,10 @@
 
 	.section .boot2
 setup_xip:
+	ldr r3, =0x20000000
+	ldr r0, =0xdeadbeef
+	str r0, [r3, #0]
+
 	ldr r3, rom_base
 
 	ldrh r0, [r3, #0x14] // rom_func_table
diff --git a/ex3/main.s b/ex3/main.s
@@ -117,10 +117,12 @@ wait_vco:
 	ldr r0, =0x20000 // 
 	bl set_alarm
 
+	ldr r3, =0x20000000
+	ldr r0, [r3, #0]
+	bl printh
+	mov r0, #0
+	str r0, [r3, #0]
 loop:
-	//ldr r0, =0xdeadbeef
-	//bl printh
-	svc #0
 	wfi
 	ldr r0, =0xcafecafe
 	bl printh
@@ -129,9 +131,8 @@ loop:
 // functions
 
 int_svcall:
-	push {lr}
-	mov r0, #'\r'
-	bl putbyte
+	push {r4, lr}
+	mov r4, lr
 	mov r0, #'s'
 	bl putbyte
 	mov r0, #'v'
@@ -144,9 +145,13 @@ int_svcall:
 	bl putbyte
 	mov r0, #'l'
 	bl putbyte
+	mov r0, r4
+	bl printh
+	mov r0, #'\r'
+	bl putbyte
 	mov r0, #'\n'
 	bl putbyte
-	pop {pc}
+	pop {r4, pc}
 
 int_systick:
 	push {lr}
@@ -162,6 +167,7 @@ int_systick:
 	pop {pc}
 
 int_alarm:
+	mov r0, sp
 	push {lr}
 	// clear interrupt
 	ldr r3, timer_base
@@ -169,7 +175,7 @@ int_alarm:
 	mov r1, #0x34
 	add r1, r1, r2
 	mov r0, #1
-	str r0, [r3, r2] // TIMER: INTR
+	str r0, [r3, r1] // TIMER: INTR
 	// reset timer
 	ldr r0, =0x20000 // 1 sec
 	bl set_alarm