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micropython/examples/asmsum.py

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py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
@micropython.asm_thumb
def asm_sum_words(r0, r1):
# r0 = len
# r1 = ptr
# r2 = sum
# r3 = dummy
mov(r2, 0)
b(loop_entry)
label(loop1)
ldr(r3, [r1, 0])
add(r2, r2, r3)
add(r1, r1, 4)
sub(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
mov(r0, r2)
all: Reformat C and Python source code with tools/codeformat.py. This is run with uncrustify 0.70.1, and black 19.10b0.
2020-02-27 04:36:53 +00:00
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
@micropython.asm_thumb
def asm_sum_bytes(r0, r1):
# r0 = len
# r1 = ptr
# r2 = sum
# r3 = dummy
mov(r2, 0)
b(loop_entry)
label(loop1)
ldrb(r3, [r1, 0])
add(r2, r2, r3)
add(r1, r1, 1)
sub(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
mov(r0, r2)
all: Reformat C and Python source code with tools/codeformat.py. This is run with uncrustify 0.70.1, and black 19.10b0.
2020-02-27 04:36:53 +00:00
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
import array
b = array.array("l", (100, 200, 300, 400))
n = asm_sum_words(len(b), b)
print(b, n)
b = array.array("b", (10, 20, 30, 40, 50, 60, 70, 80))
n = asm_sum_bytes(len(b), b)
print(b, n)