rp2040

commit 20518aaf5e90b6511d8ae7cf8be84f89c5254c0c
parent f240214eb07a70a1828e94011c90ef4112e13877
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Thu, 27 Apr 2023 11:00:24 +0900

use xosc

Diffstat:
M
ex2/main.s
 | 
10
+++++++++-

1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/ex2/main.s b/ex2/main.s
@@ -45,6 +45,11 @@ wait_xosc:
 	lsr r0, r0, #31 // STABLE bit
 	beq wait_xosc
 
+	// set system clock xosc
+	ldr r3, clocks_base
+	ldr r0, =(0x3 << 5 | 0x1)
+	str r0, [r3, #0x3c] // CLOCKS: CLK_SYS_CTRL
+
 	// blink led on gpio25
 loop:
 	bl bled0
@@ -110,8 +115,8 @@ delay_loop:
 	pop {r0}
 	bx lr
 
-// literals
 	.align 2
+literals:
 atomic_clr:
 	.word 0x00003000
 resets_base:
@@ -120,5 +125,8 @@ io_bank0_base:
 	.word 0x40014000
 xosc_base:
 	.word 0x40024000
+clocks_base:
+	.word 0x40008000
 sio_base:
 	.word 0xd0000000
+	.ltorg