rp2040

commit da33981896d672ce74d31c0c776ceffbc1ff9e6a
parent 188186f19d14278e5217ce39b21042f16fd4562c
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Wed, 28 Feb 2024 09:51:32 +0900

use c file

Diffstat:
M
ex3/main.c
 | 
11
+++++++++++
M
ex3/start.s
 | 
4
+++-

2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/ex3/main.c b/ex3/main.c
@@ -0,0 +1,11 @@
+void puts(char *);
+
+int
+main(void) {
+	puts("C file\n");
+	return 0;
+}
+
+void
+isr_alarm(void) {
+}
diff --git a/ex3/start.s b/ex3/start.s
@@ -123,6 +123,8 @@ wait_vco:
 	ldr r0, =0x20000 // 
 	bl set_alarm
 
+	bl main
+
 loop:
 	ldr r0, =message
 	bl puts
@@ -168,7 +170,6 @@ isr_systick:
 	pop {pc}
 
 isr_alarm:
-	mov r0, sp
 	push {lr}
 	// clear interrupt
 	ldr r3, timer_base
@@ -226,6 +227,7 @@ alpha:
 	pop {r4, r5, r6, r7, pc}
 
 	// puts prints null terminated string starting at r0.
+	.global puts
 puts:
 	push {r4, lr}
 	mov r4, r0