commit 97f15faf35b28d147e72dbd4b9795015a5224014
parent 2e170d8e95021914ef8aebceaac77369be3bcf0c
Author: Matsuda Kenji <info@mtkn.jp>
Date: Mon, 20 Mar 2023 10:30:53 +0900
delete unnecessary instructions
Diffstat:
| M | main.s | | | 28 | ++++------------------------ |
1 file changed, 4 insertions(+), 24 deletions(-)
diff --git a/main.s b/main.s
@@ -23,24 +23,6 @@ main:
lsl r1, r1, #22 // gpio22 and gpio24
str r1, [r0, #0x24]
- // check which systems are out of reset
- ldr r0, resets_base
- ldr r4, [r0, #0] // RESETS_RESET
- mov r6, #24
-check_reset_loop:
- mov r5, #1
- and r5, r4, r5
- beq out_of_reset
- bl p1
- b in_reset
-out_of_reset:
- bl p0
-in_reset:
- lsr r4, r4, #1
- sub r6, r6, #1
- bne check_reset_loop
-
-
// enable xosc
ldr r0, xosc_base
mov r1, #0xf
@@ -52,27 +34,25 @@ in_reset:
str r1, [r0, #0] // XOSC_CTRL
// set xosc delay
- ldr r0, xosc_base
mov r1, #47
str r1, [r0, #0xc] // XOSC_STARTUP
// wait for xosc startup
xosc_stable:
- ldr r0, xosc_base
ldr r1, [r0, #0x4] // XOSC_STATUS
lsr r1, r1, #31
beq xosc_stable
- // set feedback divider
+ // set lpp feedback divider
ldr r0, pll_sys_base
mov r1, #0x14
- lsl r1, r1, #4
- str r1, [r0, #0x8]
+ lsl r1, r1, #4 // #320
+ str r1, [r0, #0x8] // PLL_FBDIV_INT
// power on pll
ldr r1, atomic_clr
add r0, r0, r1
- mov r1, #33
+ mov r1, #33 // VCOPD | PD
str r1, [r0, #0x4] // PLL_PWR
// wait for pll locking
