fast-servo/pyfastservo/adc.py

@@ -0,0 +1,319 @@
+# 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/>.
+
+import mmap
+import os
+
+import spidev
+from common import (
+    ADC_AFE_CTRL_ADDR,
+    ADC_BITSLIP_ADDR,
+    ADC_CH0_HIGH_ADDR,
+    ADC_CH0_LOW_ADDR,
+    ADC_CH1_HIGH_ADDR,
+    ADC_CH1_LOW_ADDR,
+    ADC_DELAY_ADDR,
+    ADC_FRAME_ADDR,
+    AUX_ADC_ADDR,
+    MAP_MASK,
+    PAGESIZE,
+)
+
+# /dev/spidev1.0  <=> spidev<BUS>.<DEVICE>
+MAIN_ADC_BUS = 1
+MAIN_ADC_DEVICE = 1
+
+AUX_ADC_BUS = 1
+AUX_ADC_PORT_A = 2
+AUX_ADC_PORT_B = 3
+
+
+def main_adc_config(test_pattern):
+    high_word = (test_pattern & 0xFF00) >> 8
+    low_word = test_pattern & 0xFF
+
+    spi = spidev.SpiDev()
+
+    try:
+        spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
+        spi.max_speed_hz = 50000
+        spi.mode = 0b00  # CPOL = 0 CPHA = 0
+        spi.cshigh = True
+        # spi.read0 = False
+
+        spi_buffer = [0x00, 0x80]  # reset
+        rx_buffer = [0x00, 0x00]
+
+        spi.xfer2(spi_buffer)
+
+        # REGISTER A1
+        spi_buffer = [0x01, 0x20]  # set to Two's complement Data Format
+        spi.xfer2(spi_buffer)
+
+        # read values back
+        spi_buffer = [0x81, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x01: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != 0x20:
+            print("Different value read than sent in reg 0x02")
+
+        # REGISTER A2
+        spi_buffer = [
+            0x02,
+            0x15,
+        ]  # set to LVDS output, set 4 data lanes and turn on test mode
+        spi.xfer2(spi_buffer)
+
+        # read values back
+        spi_buffer = [0x82, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x02: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != 0x15:
+            print("Different value read than sent in reg 0x02")
+
+        # REGISTER A3
+        # test pattern high word
+        spi_buffer = [0x03, high_word]
+        spi.xfer2(spi_buffer)
+
+        # read balues back
+        spi_buffer = [0x83, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x03: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != high_word:
+            print("Different value read than sent in reg 0x03")
+
+        # REGISTER A4
+        # test pattern low word
+        spi_buffer = [0x04, low_word]
+        spi.xfer2(spi_buffer)
+
+        # read balues back
+        spi_buffer = [0x84, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x04: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != low_word:
+            print("Different value read than sent in reg 0x04")
+    finally:
+        spi.close()
+
+
+def main_adc_test_mode(enable):
+    spi = spidev.SpiDev()
+
+    try:
+        spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
+        spi.max_speed_hz = 50000
+        spi.mode = 0b00  # CPOL = 0 CPHA = 0
+        spi.cshigh = True
+        # spi.read0 = True
+
+        reg_contents = (
+            0x15 if enable else 0x11
+        )  # set to LVDS output, set 4 data lanes and turn on or off test mode
+        spi_buffer = [0x02, reg_contents]
+        spi.xfer2(spi_buffer)
+
+        # read values back
+        spi_buffer = [0x82, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x02: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != reg_contents:
+            print("Different value read than sent in reg 0x02")
+    finally:
+        spi.close()
+
+
+def read_from_memory(address, n_bytes):
+    assert n_bytes <= 4
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            contents = mem[start_addr:stop_addr]
+            read_value = list(contents)[:n_bytes]
+            # print("Read value: ", read_value)
+    finally:
+        os.close(f)
+
+    return read_value
+
+
+def write_to_memory(address, value):
+    value_bytes = value.to_bytes(4, "little")
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            mem[start_addr:stop_addr] = value_bytes
+            contents = mem[start_addr:stop_addr]
+            # print("Read value: ", list(contents), " written value: ", list(value_bytes))
+    finally:
+        os.close(f)
+
+
+def word_align():
+
+    value = 0
+    edge_detected = False
+    transition = False
+    tap_delay = 0
+
+    for i in range(4):
+        current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+        if current_frame != 0x0C:
+            print(
+                f"Performing bitslip (bitslip iteration: {i}). Reason: current_frame is 0x{current_frame:02x} instead of 0x0C"
+            )
+            write_to_memory(ADC_BITSLIP_ADDR, 1)
+        else:
+            print(f"No bitslip required; Currernt frame = 0x{current_frame:02x}")
+            break
+
+    current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+    prev_frame = current_frame
+
+    for i in range(32):
+        write_to_memory(ADC_DELAY_ADDR, tap_delay)
+        if edge_detected == 1:
+            break
+        current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+
+        print(f"Tap delay: {tap_delay}")
+        print(f"Current frame: 0x{current_frame:02x}")
+
+        if current_frame == prev_frame:
+            tap_delay += 1
+        elif not transition:
+            tap_delay += 1
+            transition = True
+        elif transition:
+            tap_delay = i // 2
+            edge_detected = True
+
+        prev_frame = current_frame
+
+    if not edge_detected:
+        tap_delay = 11  # empirically tested to work best
+        write_to_memory(ADC_DELAY_ADDR, tap_delay)
+        print(f"No edge detected; setting iDelay to: {tap_delay}")
+    if edge_detected:
+        write_to_memory(ADC_DELAY_ADDR, tap_delay + 2)
+        print(f"Edge detected; setting iDelay to (tap_delay + 2): {tap_delay} + 2")
+
+    adc_ch0 = read_from_memory(ADC_CH0_HIGH_ADDR, 4)
+    print(f"ADC_CH0: 0x{adc_ch0}")
+
+    adc_ch0 = (read_from_memory(ADC_CH0_HIGH_ADDR, 1)[0] << 8) | read_from_memory(
+        ADC_CH0_LOW_ADDR, 1
+    )[0]
+    adc_ch1 = (read_from_memory(ADC_CH1_HIGH_ADDR, 1)[0] << 8) | read_from_memory(
+        ADC_CH1_LOW_ADDR, 1
+    )[0]
+    print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
+    print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
+
+
+def modify_bit(original_value, position, bit_value):
+    mask = 1 << position
+    return (original_value & ~mask) | (bit_value << position)
+
+
+def adc_aux_config():
+    # MSB to LSB
+    # | RANGE | ADDR [2:0] | DIFF |
+    #       DIFF = 0    =>  configure as single ended (it is negated in gateware)
+    #       RANGE = 0   =>  configure as 0-2.5 Vref
+    to_write = 0b00000
+    write_to_memory(AUX_ADC_ADDR, to_write)
+
+
+def adc_aux_read(port, type, pin):
+    # port:
+    #   1 - port A
+    #   2 - port B
+    # type:
+    #   0 - single-ended
+    #   1 - differential
+    # pin:
+    #   0b000   - VA1/VB1
+    #   0b001   - VA2/VB2
+    #   0b010   - VA3/VB3
+    #   0b011   - VA4/VB4
+
+    assert type in (0, 1)
+    assert port in (1, 2)
+
+    write_buffer = [0, 0]
+    read_buffer = [0, 0]
+
+    aux_config_reg = read_from_memory(AUX_ADC_ADDR, 1)[0]
+    aux_config = (aux_config_reg & 0b10001) | pin << 1
+    write_to_memory(AUX_ADC_ADDR, aux_config)
+
+    spi = spidev.SpiDev()
+    try:
+        spi.open(1, 3)  # AUX ADC 1?
+        spi.max_speed_hz = 5000
+        spi.mode = 0b00
+        spi.cshigh = True
+
+        read_buffer = spi.xfer2(write_buffer)
+        mu_voltage = read_buffer[0] << 8 | read_buffer[1] >> 2
+        print(f"MU_voltage: 0x{mu_voltage:04X}")
+        print(f"Read_buffer[0]: 0x{read_buffer[0]:02X}")
+        print(f"Read_buffer[1]: 0x{read_buffer[1]:02X}")
+        return mu_voltage * 2.5 / 4096
+
+    finally:
+        spi.close()
+
+
+def main():
+    main_adc_config(0x811F)
+    word_align()
+
+    main_adc_test_mode(False)
+
+    write_to_memory(ADC_AFE_CTRL_ADDR, 0b1100) # {-, -, ch2_X10, ch1_X10}
+    print(read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0])
+
+
+if __name__ == "__main__":
+    main()

fast-servo/pyfastservo/common.py

@@ -0,0 +1,74 @@
+# 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/>.
+
+CSR_SIZE = 0x800
+MAP_SIZE = 0x1000
+MAP_MASK = 0xFFF
+PAGESIZE = 0x1000
+
+LINIEN_OFFSET = 0x0
+# LINIEN_OFFSET = 0x300000
+
+# ----------------------------------------------------------------
+# FRONT PANEL LEDS REGISTER ADDRESSES
+LED0_BASE_ADDR = 0x40005000 + LINIEN_OFFSET
+LED1_BASE_ADDR = 0x40005800 + LINIEN_OFFSET
+LED2_BASE_ADDR = 0x40006000 + LINIEN_OFFSET
+LED3_BASE_ADDR = 0x40006800 + LINIEN_OFFSET
+
+
+# ----------------------------------------------------------------
+# DAC REGISTER ADDRESSES
+ADC_BASE_ADDR            =      0x40004800 + LINIEN_OFFSET
+ADC_FRAME_OFFSET         =      0x0
+ADC_CH0_HIGH_OFFSET      =      0x4
+ADC_CH0_LOW_OFFSET       =      0x8
+ADC_CH1_HIGH_OFFSET      =      0xC
+ADC_CH1_LOW_OFFSET       =      0x10
+ADC_TAP_DELAY_OFFSET     =      0x14
+ADC_BITSLIP_OFFSET       =      0x18
+ADC_AFE_CTRL_OFFSET     =       0x1C
+
+
+ADC_FRAME_ADDR      =   ADC_BASE_ADDR + ADC_FRAME_OFFSET
+ADC_CH0_HIGH_ADDR   =   ADC_BASE_ADDR + ADC_CH0_HIGH_OFFSET
+ADC_CH0_LOW_ADDR    =   ADC_BASE_ADDR + ADC_CH0_LOW_OFFSET
+ADC_CH1_HIGH_ADDR   =   ADC_BASE_ADDR + ADC_CH1_HIGH_OFFSET
+ADC_CH1_LOW_ADDR    =   ADC_BASE_ADDR + ADC_CH1_LOW_OFFSET
+ADC_DELAY_ADDR      =   ADC_BASE_ADDR + ADC_TAP_DELAY_OFFSET
+ADC_BITSLIP_ADDR    =   ADC_BASE_ADDR + ADC_BITSLIP_OFFSET
+ADC_AFE_CTRL_ADDR   =   ADC_BASE_ADDR + ADC_AFE_CTRL_OFFSET
+
+AUX_ADC_ADDR        =   0x40007800 + LINIEN_OFFSET
+
+
+# ----------------------------------------------------------------
+# DAC REGISTER ADDRESSES
+DAC_BASE_ADDR           =   0x40007000 + LINIEN_OFFSET
+CTRL_OFFSET             =   0x0
+CH0_HIGH_WORD_OFFSET    =   0x4
+CH0_LOW_WORD_OFFSET     =   0x8
+CH1_HIGH_WORD_OFFSET    =   0xC
+CH1_LOW_WORD_OFFSET     =   0x10
+
+CTRL_ADDR               =   DAC_BASE_ADDR + CTRL_OFFSET
+CH0_HIGH_WORD_ADDR      =   DAC_BASE_ADDR + CH0_HIGH_WORD_OFFSET
+CH0_LOW_WORD_ADDR       =   DAC_BASE_ADDR + CH0_LOW_WORD_OFFSET
+CH1_HIGH_WORD_ADDR      =   DAC_BASE_ADDR + CH1_HIGH_WORD_OFFSET
+CH1_LOW_WORD_ADDR       =   DAC_BASE_ADDR + CH1_LOW_WORD_OFFSET

fast-servo/pyfastservo/dac.py

@@ -0,0 +1,182 @@
+# 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/>.
+
+import mmap
+import os
+
+import spidev
+from common import (
+    CH0_HIGH_WORD_ADDR,
+    CH0_LOW_WORD_ADDR,
+    CH1_HIGH_WORD_ADDR,
+    CH1_LOW_WORD_ADDR,
+    CTRL_ADDR,
+    MAP_MASK,
+    PAGESIZE,
+)
+
+# /dev/spidev2.0  <=> spidev<BUS>.<DEVICE>
+MAIN_DAC_BUS = 2
+MAIN_DAC_DEVICE = 0
+
+DAC_VERSION = 0x0A
+
+
+def main_dac_init():
+    spi = spidev.SpiDev()
+
+    try:
+        spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE)
+        spi.max_speed_hz = 5000
+        spi.mode = 0b00  # CPOL = 0 CPHA = 0
+        spi.cshigh = True
+
+        spi_buffer = [0x00, 0x10]  # software reset
+        spi.xfer2(spi_buffer)
+
+        spi_buffer = [0x00, 0x00]  # release software reset
+        spi.xfer2(spi_buffer)
+
+        spi_buffer = [
+            0x80,
+            0x00,
+        ]  # for some reason it is needed to read the reset address for reset to actually reset
+        rx_buffer = spi.xfer2(spi_buffer)
+
+        spi_buffer = [0x9F, 0x00]  # hardware version
+        rx_buffer = spi.xfer2(spi_buffer)
+        if rx_buffer[1] != DAC_VERSION:
+            print(f"Unrecognized device: 0x{rx_buffer[1]:02X}")
+
+        print("=== Contents of spi buffer after DAC VERSION read back: ===")
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        spi_buffer = [0x82, 00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        # set to 2's complement and I to be first of pair on data input pads
+        spi_buffer = [0x02, 0xB4]
+        rx_buffer = spi.xfer2(spi_buffer)
+        spi_buffer = [0x82, 00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        for i in range(10):
+            spi_buffer = [0x94, 0x00]
+            rx_buffer = spi.xfer2(spi_buffer)
+            print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+    finally:
+        spi.close()
+
+
+def read_from_memory(address, n_bytes):
+    assert n_bytes <= 4
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            contents = mem[start_addr:stop_addr]
+            read_value = list(contents)[:n_bytes]
+    finally:
+        os.close(f)
+
+    return read_value
+
+
+def write_to_memory(address, value):
+    value_bytes = value.to_bytes(4, "little")
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            mem[start_addr:stop_addr] = value_bytes
+            contents = mem[start_addr:stop_addr]
+    finally:
+        os.close(f)
+
+
+def manual_override(enable=True):
+    reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
+    print(f"REG contents: 0b{reg_contents:03b}")
+    to_write = reg_contents | 0b1 if enable else reg_contents & 0b110
+    write_to_memory(CTRL_ADDR, to_write)
+
+
+def power_down(channel, power_down=True):
+    assert channel in (0, 1)
+
+    bitmask = 1 << (channel + 1) & 0b111
+    reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
+    value = (1 if power_down else 0) << (channel + 1)
+    reg_contents &= ~bitmask
+
+    to_write = reg_contents | value
+    write_to_memory(CTRL_ADDR, to_write)
+    reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
+    print(f"REG contents: 0b{reg_contents:03b}")
+
+
+def write_sample(channel, sample):
+    assert channel in (0, 1)
+    if channel == 0:
+        addresses = [CH0_HIGH_WORD_ADDR, CH0_LOW_WORD_ADDR]
+    else:
+        addresses = [CH1_HIGH_WORD_ADDR, CH1_LOW_WORD_ADDR]
+
+    low_word_value = sample & 0xFF
+    high_word_value = (sample >> 8) & 0x3F
+    values = [high_word_value, low_word_value]
+    for addr, value in zip(addresses, values):
+        write_to_memory(addr, value)
+
+
+def write_ramp():
+    signal = [i for i in range(16384)]
+
+    for value in signal:
+        write_sample(0, value)
+
+def main():
+    main_dac_init()
+    power_down(0, False)
+    power_down(1, False)
+    
+if __name__ == "__main__":
+    main()

fast-servo/pyfastservo/fp_leds.py

@@ -0,0 +1,66 @@
+# 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/>.
+
+import mmap
+import os
+import time
+
+from common import (
+    LED0_BASE_ADDR,
+    LED1_BASE_ADDR,
+    LED2_BASE_ADDR,
+    LED3_BASE_ADDR,
+    MAP_MASK,
+    PAGESIZE,
+)
+
+ON = 1
+OFF = 0
+
+
+def main():
+    addrs = [LED0_BASE_ADDR, LED1_BASE_ADDR, LED2_BASE_ADDR, LED3_BASE_ADDR]
+
+    f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+    for addr in addrs:
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            for i in range(6):
+                start_addr = addr & MAP_MASK
+                stop_addr = start_addr + 4
+                print(
+                    f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}"
+                )
+                mem[start_addr:stop_addr] = ON.to_bytes(4, "little")
+                contents = mem[start_addr:stop_addr]
+                time.sleep(0.5)
+                mem[start_addr:stop_addr] = OFF.to_bytes(4, "little")
+                contents = mem[start_addr:stop_addr]
+                time.sleep(0.5)
+
+    os.close(f)
+
+
+if __name__ == "__main__":
+    main()

fast-servo/pyfastservo/initialize.py

@@ -0,0 +1,30 @@
+# 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/>.
+
+import adc
+import si5340
+import dac
+
+def main():
+    si5340.configure_si5340()
+    adc.main()
+    dac.main()
+
+if __name__ == "__main__":
+    main()

fast-servo/pyfastservo/si5340.py

@@ -0,0 +1,118 @@
+# 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()