rp2040

commit c3565a1440c02ce651b2777620a691f3c45f87ac
parent b84291ba5f64e2f91580e2548163ef91ea898ea5
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Mon, 20 Mar 2023 09:19:41 +0900

add led for debugging

Diffstat:
M
main.s
 | 
42
++++++++++++++++++++++++++++++------------

1 file changed, 30 insertions(+), 12 deletions(-)
diff --git a/main.s b/main.s
@@ -11,14 +11,16 @@ main:
 
 	// set gpio24 funct as sio
 	ldr r0, io_bank0_base
-	add r0, r0, #0xc4
 	mov r1, #5
+	add r0, r0, #0xb4 // io_bank0_gpio22_ctrl
+	str r1, [r0, #0]
+	add r0, r0, #0x10 // io_bank0_gpio24_ctrl
 	str r1, [r0, #0]
 
 	// enable gpio output
 	ldr r0, sio_base
-	mov r1, #1
-	lsl r1, r1, #24
+	mov r1, #5
+	lsl r1, r1, #22 // gpio22 and gpio24
 	str r1, [r0, #0x24]
 
 	// enable xosc
@@ -84,7 +86,8 @@ pll_lock:
 	str r1, [r0, #0x3c] // CLOCKS_CLK_SYS_CTRL
 
 loop:
-	bl led_blink
+	bl p0
+	bl p1
 	b loop
 
 // functions
@@ -92,6 +95,7 @@ loop:
 unreset:
 	// unreset subsystems specified by r0
 	// args: bit mask to specify the subsystems to unreset
+	// return: the bit mask same as the arg
 	ldr r1, resets_base
 	ldr r2, atomic_clr
 	add r1, r1, r2
@@ -100,6 +104,8 @@ unreset:
 
 wait_unreset:
 	// wait for subsystems specified by r0 to reset done
+	// args: bit mask to specify the subsystems to wait for
+	// return: void
 	ldr r1, resets_base
 reset_chk:
 	ldr r2, [r1, #0x8] // RESETS_RESET_DONE
@@ -107,17 +113,29 @@ reset_chk:
 	beq reset_chk
 	bx lr
 
+p0:
+	// blink led on gpio24
+	push {lr}
+	mov r0, #1
+	lsl r0, r0, #24
+	bl led_blink
+	pop {pc}
+
+p1:
+	// blink led on gpio22
+	push {lr}
+	mov r0, #1
+	lsl r0, r0, #22
+	bl led_blink
+	pop {pc}
+
 led_blink:
 	push {lr}
-	ldr r0, sio_base
-	mov r1, #1
-	lsl r1, r1, #24
-	mov r3, #0
-	// assert gpio24
-	str r1, [r0, #0x10]
+	ldr r1, sio_base
+	mov r2, #0
+	str r0, [r1, #0x10] // SIO_GPIO_OUT_SET
 	bl delay
-	// deassert gpio24
-	str r3, [r0, #0x10]
+	str r0, [r1, #0x18] // SIO_GPIO_OUT_CLR
 	bl delay
 	pop {pc}