counter.py

"""
Very basic example showing data exchange main CPU <--> ULP coprocessor.

To show that the ULP is doing something, it just increments the value <data>.
It does that once per ulp timer wakeup (and then the ULP halts until it gets
waked up via the timer again).

The timer is set to a rather long period, so you can watch the data value
incrementing (see loop at the end).
"""

fromesp32importULP
frommachineimportmem32

fromesp32_ulpimportsrc_to_binary

source="""\
data: .long 0

entry: move r3, data # load address of data into r3
 ld r2, r3, 0 # load data contents ([r3+0]) into r2
 add r2, r2, 1 # increment r2
 st r2, r3, 0 # store r2 contents into data ([r3+0])

 halt # halt ULP co-prozessor (until it gets waked up again)
"""

binary=src_to_binary(source)

load_addr, entry_addr=0, 4

ULP_MEM_BASE=0x50000000
ULP_DATA_MASK=0xffff# ULP data is only in lower 16 bits

ulp=ULP()
ulp.set_wakeup_period(0, 50000) # use timer0, wakeup after 50.000 cycles
ulp.load_binary(load_addr, binary)

mem32[ULP_MEM_BASE+load_addr] =0x1000
ulp.run(entry_addr)

whileTrue:
print(hex(mem32[ULP_MEM_BASE+load_addr] &ULP_DATA_MASK))