1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
| /***********************************************************************
| * File: led.S
| * Version: 1.0.0
| * Copyright: 2013 (c) Guo Wenxue <guowenxue@gmail.com>
| * Description: This ASM code used to turn LED0~LED4 on/off on OK6410 board
| * ChangeLog: 1, Release initial version on "Sun Feb 24 15:06:12 CST 2013"
| *
| ***********************************************************************/
|
|
| #define SROM_BW 0x70000000
| #define WTCON 0x7E004000
| #define GPMCON 0x7F008820
| #define GPMDAT 0x7F008824
| #define GPMUP 0x7F008828
|
| #define OUTPUT 0x01 /*Set GPIO port as output mode*/
| #define INPUT 0x00 /*Set GPIO port as input mode*/
|
| #define LED1 0 /*On OK6410 board, LED1 use GPM1*/
| #define LED2 1 /*On OK6410 board, LED2 use GPM0*/
| #define LED3 2 /*On OK6410 board, LED3 use GPM2*/
| #define LED4 3 /*On OK6410 board, LED4 use GPM3*/
|
|
| #define DELAY 0X1000000 /*TEXTBASE = 0x57e00000, we have init CPU to 533MHz*/
| //#define DELAY 0X10000 /*TEXTBASE = 0x0C000000, we havn't init CPU CLOCK*/
|
| .global _start
|
| _start:
| /* Peri port setup */
| ldr r0, =SROM_BW
| orr r0, r0, #0x13
| mcr p15,0,r0,c15,c2,4 @ 256M(0x70000000-0x7fffffff)
|
| /* Disable watchdog */
| ldr r0, =WTCON
| mov r1, #0
| str r1, [r0]
|
| /*Set GPM0, GPM1, GPM2, GPM3 as GPIO OUTPUT mode*/
| ldr r0, =GPMCON
| bic r1, r1, #0x00FF /*Set GPMCON for GPM0,GPM1 as 0x00 */
| orr r1, r1, #0x0011 /*Set GPMCON for GPM0,GPM1 as GPIOOUT, 0x01*/
| bic r1, r1, #0xFF00 /*Set GPMCON for GPM2,GPM3 as 0x00*/
| orr r1, r1, #0x1100 /*Set GPMCON for GPM2,GPM3 as GPIOOUT, 0x01*/
| str r1, [r0]
|
| loopled:
| /*Turn off LED1, LED2, LED3, LED4*/
| ldr r0, =GPMDAT
| ldr r1, [r0]
| orr r1, r1, #0xF /*Set bit[0:3] as high level*/
| str r1, [r0]
| bl delay
|
| /*Turn on LED1*/
| ldr r1, [r0]
| bic r1, r1, #(1<<LED1) /*LED1 GPIO port as low level*/
| str r1, [r0]
| bl delay
|
| /*Turn on LED2*/
| ldr r1, [r0]
| bic r1, r1, #(1<<LED2) /*LED2 GPIO port as low level*/
| str r1, [r0]
| bl delay
|
| /*Turn on LED3*/
| ldr r1, [r0]
| bic r1, r1, #(1<<LED3) /*LED3 GPIO port as low level*/
| str r1, [r0]
| bl delay
|
| /*Turn on LED4*/
| ldr r1, [r0]
| bic r1, r1, #(1<<LED4) /*LED4 GPIO port as low level*/
| str r1, [r0]
| bl delay
|
| b loopled /*Loop running LED*/
|
| delay:
| mov r2, #DELAY
| delay_loop:
| sub r2, r2,#1
| cmp r2, #0
| bne delay_loop
| mov pc, lr
|
| halt:
| b halt
|
|
