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
|
# flash LED #1 using inline assembler
@micropython.asm_thumb
def flash_led(r0):
movw(r1, (stm.GPIOA + stm.GPIO_BSRRL) & 0xffff)
movt(r1, ((stm.GPIOA + stm.GPIO_BSRRL) >> 16) & 0x7fff)
movw(r2, 1 << 13)
movt(r2, 0)
movw(r3, 0)
movt(r3, 1 << 13)
b(loop_entry)
label(loop1)
# turn LED on
str(r2, r1, 0)
# delay for a bit
movw(r4, 5599900 & 0xffff)
movt(r4, (5599900 >> 16) & 0xffff)
label(delay_on)
subs(r4, r4, 1)
cmp(r4, 0)
bgt(delay_on)
# turn LED off
str(r3, r1, 0)
# delay for a bit
movw(r4, 5599900 & 0xffff)
movt(r4, (5599900 >> 16) & 0xffff)
label(delay_off)
subs(r4, r4, 1)
cmp(r4, 0)
bgt(delay_off)
# loop r0 times
subs(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
# flash LED #1 using inline assembler
# this version uses the convenience assembler operation 'movwt'
@micropython.asm_thumb
def flash_led_v2(r0):
movwt(r1, stm.GPIOA + stm.GPIO_BSRRL)
movwt(r2, 1 << 13)
movwt(r3, 1 << (16 + 13))
b(loop_entry)
label(loop1)
# turn LED on
str(r2, r1, 0)
# delay for a bit
movwt(r4, 5599900)
label(delay_on)
subs(r4, r4, 1)
cmp(r4, 0)
bgt(delay_on)
# turn LED off
str(r3, r1, 0)
# delay for a bit
movwt(r4, 5599900)
label(delay_off)
subs(r4, r4, 1)
cmp(r4, 0)
bgt(delay_off)
# loop r0 times
subs(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
flash_led_v2(5)
|
