forked from M-Labs/nix-servo
67 lines
2.0 KiB
Python
67 lines
2.0 KiB
Python
# This file is part of Fast Servo Software Package.
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#
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# Copyright (C) 2023 Jakub Matyas
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# Warsaw University of Technology <jakubk.m@gmail.com>
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# SPDX-License-Identifier: GPL-3.0-or-later
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import mmap
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import os
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import time
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from pyfastservo.common import (
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LED0_BASE_ADDR,
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LED1_BASE_ADDR,
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LED2_BASE_ADDR,
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LED3_BASE_ADDR,
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MAP_MASK,
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PAGESIZE,
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)
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ON = 1
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OFF = 0
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def main():
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addrs = [LED0_BASE_ADDR, LED1_BASE_ADDR, LED2_BASE_ADDR, LED3_BASE_ADDR]
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f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
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for addr in addrs:
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with mmap.mmap(
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f,
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PAGESIZE,
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mmap.MAP_SHARED,
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mmap.PROT_READ | mmap.PROT_WRITE,
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offset=addr & ~MAP_MASK,
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) as mem:
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for i in range(6):
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start_addr = addr & MAP_MASK
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stop_addr = start_addr + 4
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print(
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f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}"
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)
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mem[start_addr:stop_addr] = ON.to_bytes(4, "little")
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contents = mem[start_addr:stop_addr]
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time.sleep(0.5)
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mem[start_addr:stop_addr] = OFF.to_bytes(4, "little")
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contents = mem[start_addr:stop_addr]
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time.sleep(0.5)
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os.close(f)
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if __name__ == "__main__":
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main()
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