for use w/ 'glasgow script memory-25x' - little spi flash wearout experiment

wearout.py

import time
import statistics

cur_iter = 0
write_size = 256
base_addr = 0

inv = False
erase_times = []
prog_times = []


while True:
    if inv:
        page = (cur_iter ^ 0xffff_ffff_ffff_ffff).to_bytes(8, "little") * (write_size // 8)
    else:
        page = cur_iter.to_bytes(8, "little") * (write_size // 8)

    base_time = time.perf_counter_ns()
    await iface.write_enable()
    await iface.sector_erase(base_addr)
    erase_times.append(time.perf_counter_ns() - base_time)

    out = await iface.read(base_addr, len(page))
    if out != bytearray(b'\xff' * len(page)) :
        print(f"read {out.hex()} instead of all FF...")
        input("waiting...")

    base_time = time.perf_counter_ns()
    await iface.write_enable()
    await iface.page_program(base_addr, page)
    prog_times.append(time.perf_counter_ns() - base_time)

    if cur_iter % 100 == 0:
        avg_prog = statistics.mean(prog_times)
        avg_erase= statistics.mean(erase_times)

        prog_times = []
        erase_times = []
        print(f"current count: {cur_iter}, erase avg ms: {avg_erase / 1E6 : ,.3f}, prog avg ms: {avg_prog/1E6 : ,.3f}")

    out = await iface.read(base_addr, len(page))
    if out != page:
        print("wtf? mismatch:\nwrote:\n\t" + page.hex() + "\ngot:\n\t" + out.hex())
        print(f"currently: {cur_iter}")
        input("waiting....")

    inv = not inv
    cur_iter += 1