forked from M-Labs/nix-servo
118 lines
3.8 KiB
Python
118 lines
3.8 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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from smbus2 import SMBus
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BUS_NO = 0
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IC_ADDR = 0x74
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PAGE_ADDR = 0x1
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OUT0_MUX_SEL_ADDR = 0x15
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OUT1_MUX_SEL_ADDR = 0x1A
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OUT2_MUX_SEL_ADDR = 0x29
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OUT3_MUX_SEL_ADDR = 0x2E
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OUT2_AMPL_ADDR = 0x28
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OUT3_PDN_ADDR = 0x2B
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OUT3_FORMAT_ADDR = 0x2C
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OUT3_AMPL_ADDR = 0x2D
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N1_DIVIDER_UPDATE_ADDR = 0x17
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data_to_write = 0
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clk_out_addr = [
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OUT0_MUX_SEL_ADDR,
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OUT1_MUX_SEL_ADDR,
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OUT2_MUX_SEL_ADDR,
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OUT3_MUX_SEL_ADDR,
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]
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def configure_si5340():
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with SMBus(BUS_NO) as bus:
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bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0) # setting page to page 0
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# read device id
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low_word = bus.read_byte_data(IC_ADDR, 0x2)
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high_word = bus.read_byte_data(IC_ADDR, 0x3)
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print(f"DEV ID: 0x{high_word:2x}{low_word:2x}")
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data_to_write = 0x1
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bus.write_byte_data(
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IC_ADDR, PAGE_ADDR, data_to_write
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) # change to page 1 for output settings
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readback = bus.read_byte_data(IC_ADDR, PAGE_ADDR)
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if data_to_write != readback:
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raise ValueError(f"Failed to set page.")
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for addr in clk_out_addr:
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bus.write_byte_data(IC_ADDR, addr, 1) # set source to N1
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bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 13)
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readback = bus.read_byte_data(IC_ADDR, OUT2_AMPL_ADDR)
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# if data_to_write != readback:
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# raise ValueError(f"Problematic read: {readback}.")
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bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 0x6B) # setting OUT2 to LVDS25
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bus.write_byte_data(IC_ADDR, OUT3_FORMAT_ADDR, 0xCC) # SETTING out3 to LVCMOS 18
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# bus.write_byte_data(IC_ADDR, 0x2E, 0x09) # SETTING out3 to LVCMOS 33
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readback = bus.read_byte_data(IC_ADDR, OUT3_PDN_ADDR)
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print(f"Si5340 OUTx_PDN CLK3: 0x{readback}")
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readback = bus.read_byte_data(IC_ADDR, OUT3_FORMAT_ADDR)
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print(f"Si5340 OUTx_FORMAT CLK3: 0x{readback}")
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readback = bus.read_byte_data(IC_ADDR, OUT3_AMPL_ADDR)
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print(f"Si5340 OUTx_AMPL CLK3: 0x{readback}")
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readback = bus.read_byte_data(IC_ADDR, OUT3_MUX_SEL_ADDR)
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print(f"Si5340 OUTx_CM CLK3: 0x{readback}")
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bus.write_byte_data(
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IC_ADDR, PAGE_ADDR, 0x3
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) # setting page to 3 to change dividers values
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n1_numerator = [0x0, 0x0, 0x0, 0x60, 0x22, 0x0]
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n1_numerator_10M = [0x0, 0x0, 0x0, 0xC0, 0x57, 0x1]
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n1_num_addr = [0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12]
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n1_denom_addr = [0x13, 0x14, 0x15, 0x16]
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for addr, value in zip(n1_num_addr, n1_numerator):
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bus.write_byte_data(IC_ADDR, addr, value)
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bus.write_byte_data(IC_ADDR, N1_DIVIDER_UPDATE_ADDR, 1)
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for addr in n1_num_addr:
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readback = bus.read_byte_data(IC_ADDR, addr)
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print(f"Numerator buffer: 0x{readback:02x}")
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for addr in n1_denom_addr:
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readback = bus.read_byte_data(IC_ADDR, addr)
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print(f"Denominator buffer: 0x{readback:02x}")
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bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0) # setting page to page 0
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if __name__ == "__main__":
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configure_si5340() |