nix-servo/fast-servo/pyfastservo/si5340.py

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2024-03-06 17:41:21 +08:00
# This file is part of Fast Servo Software Package.
#
# Copyright (C) 2023 Jakub Matyas
# Warsaw University of Technology <jakubk.m@gmail.com>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from smbus2 import SMBus
BUS_NO = 0
IC_ADDR = 0x74
PAGE_ADDR = 0x1
OUT0_MUX_SEL_ADDR = 0x15
OUT1_MUX_SEL_ADDR = 0x1A
OUT2_MUX_SEL_ADDR = 0x29
OUT3_MUX_SEL_ADDR = 0x2E
OUT2_AMPL_ADDR = 0x28
OUT3_PDN_ADDR = 0x2B
OUT3_FORMAT_ADDR = 0x2C
OUT3_AMPL_ADDR = 0x2D
N1_DIVIDER_UPDATE_ADDR = 0x17
data_to_write = 0
clk_out_addr = [
OUT0_MUX_SEL_ADDR,
OUT1_MUX_SEL_ADDR,
OUT2_MUX_SEL_ADDR,
OUT3_MUX_SEL_ADDR,
]
def configure_si5340():
with SMBus(BUS_NO) as bus:
bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0) # setting page to page 0
# read device id
low_word = bus.read_byte_data(IC_ADDR, 0x2)
high_word = bus.read_byte_data(IC_ADDR, 0x3)
print(f"DEV ID: 0x{high_word:2x}{low_word:2x}")
data_to_write = 0x1
bus.write_byte_data(
IC_ADDR, PAGE_ADDR, data_to_write
) # change to page 1 for output settings
readback = bus.read_byte_data(IC_ADDR, PAGE_ADDR)
if data_to_write != readback:
raise ValueError(f"Failed to set page.")
for addr in clk_out_addr:
bus.write_byte_data(IC_ADDR, addr, 1) # set source to N1
bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 13)
readback = bus.read_byte_data(IC_ADDR, OUT2_AMPL_ADDR)
# if data_to_write != readback:
# raise ValueError(f"Problematic read: {readback}.")
bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 0x6B) # setting OUT2 to LVDS25
bus.write_byte_data(IC_ADDR, OUT3_FORMAT_ADDR, 0xCC) # SETTING out3 to LVCMOS 18
# bus.write_byte_data(IC_ADDR, 0x2E, 0x09) # SETTING out3 to LVCMOS 33
readback = bus.read_byte_data(IC_ADDR, OUT3_PDN_ADDR)
print(f"Si5340 OUTx_PDN CLK3: 0x{readback}")
readback = bus.read_byte_data(IC_ADDR, OUT3_FORMAT_ADDR)
print(f"Si5340 OUTx_FORMAT CLK3: 0x{readback}")
readback = bus.read_byte_data(IC_ADDR, OUT3_AMPL_ADDR)
print(f"Si5340 OUTx_AMPL CLK3: 0x{readback}")
readback = bus.read_byte_data(IC_ADDR, OUT3_MUX_SEL_ADDR)
print(f"Si5340 OUTx_CM CLK3: 0x{readback}")
bus.write_byte_data(
IC_ADDR, PAGE_ADDR, 0x3
) # setting page to 3 to change dividers values
n1_numerator = [0x0, 0x0, 0x0, 0x60, 0x22, 0x0]
n1_numerator_10M = [0x0, 0x0, 0x0, 0xC0, 0x57, 0x1]
n1_num_addr = [0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12]
n1_denom_addr = [0x13, 0x14, 0x15, 0x16]
for addr, value in zip(n1_num_addr, n1_numerator):
bus.write_byte_data(IC_ADDR, addr, value)
bus.write_byte_data(IC_ADDR, N1_DIVIDER_UPDATE_ADDR, 1)
for addr in n1_num_addr:
readback = bus.read_byte_data(IC_ADDR, addr)
print(f"Numerator buffer: 0x{readback:02x}")
for addr in n1_denom_addr:
readback = bus.read_byte_data(IC_ADDR, addr)
print(f"Denominator buffer: 0x{readback:02x}")
bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0) # setting page to page 0
if __name__ == "__main__":
configure_si5340()