rp2040

commit 31b8a0f3c01e559312118174e8e75b00148de40b
parent eb40b0e9cc98390ce77b8e4b5a3c302600444f77
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Mon, 26 Feb 2024 11:59:54 +0900

I think the clock which drives periferals bacomes slower
after pushing the RUN button

Diffstat:
M
ex3/boot2.s
 | 
4
----
M
ex3/main.s
 | 
24
+++++++++++++++---------

2 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/ex3/boot2.s b/ex3/boot2.s
@@ -3,10 +3,6 @@
 
 	.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
@@ -100,14 +100,16 @@ wait_vco:
 	// enable FIFO and set format
 	ldr r0, =(3 << 5 | 1 << 4) // WLEN = 8, FEN = 1
 	str r0, [r3, #0x2c] // UART: UARTLCR_H
-
+/*
 	// enable interrupt
 	ldr r3, ppb_base
 	// enable timer_irq_0
 	ldr r1, =0xe100
 	mov r0, #1
 	str r0, [r3, r1] // M0PLUS: NVIC_ISER
+*/
 
+loop:
 	// setup timer
 	ldr r3, timer_base
 	// enable alarm_0 interrupt
@@ -117,15 +119,19 @@ 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:
-	wfi
-	ldr r0, =0xcafecafe
+wait:
+	ldr r0, [r3, #0x20] // TIMER: ARMED
+	mov r1, #0x1
+	tst r0, r1
+	bne wait
+
+	mov r3, #0
+	ldr r0, [r3, #0x4]
 	bl printh
+	mov r0, #'\r'
+	bl putbyte
+	mov r0, #'\n'
+	bl putbyte
 	b loop
 
 // functions