FilesExpand file tree

 main

/

viper_addr.py

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

43 lines (31 loc) · 775 Bytes

 main

/

viper_addr.py

Copy path

Top

File metadata and controls

• Code
• Blame

43 lines (31 loc) · 775 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

# test passing addresses to viper

@micropython.viper

def get_addr(x: ptr) -> ptr:

return x

@micropython.viper

def memset(dest: ptr8, c: int, n: int):

for i in range(n):

dest[i] = c

@micropython.viper

def memsum(src: ptr8, n: int) -> int:

s = 0

for i in range(n):

s += src[i]

return s

# create array and get its address

ar = bytearray(b"0000")

addr = get_addr(ar)

print(type(ar))

print(type(addr))

print(ar)

# pass array as an object

memset(ar, ord("1"), len(ar))

print(ar)

# pass direct pointer to array buffer

memset(addr, ord("2"), len(ar))

print(ar)

# pass direct pointer to array buffer, with offset

memset(addr + 2, ord("3"), len(ar) - 2)

print(ar)

# pass a read-only bytes object in

print(memsum(b"\x01\x02\x03\x04", 4))