forked from M-Labs/nix-servo
pyfastservo: fix adc init script and cleanup
This commit is contained in:
parent
b92d401f2b
commit
e3b1525125
|
|
@ -17,8 +17,6 @@
|
|||
# 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 pyfastservo.common import (
|
||||
|
|
@ -33,6 +31,8 @@ from pyfastservo.common import (
|
|||
AUX_ADC_ADDR,
|
||||
MAP_MASK,
|
||||
PAGESIZE,
|
||||
write_to_memory,
|
||||
read_from_memory
|
||||
)
|
||||
|
||||
# /dev/spidev1.0 <=> spidev<BUS>.<DEVICE>
|
||||
|
|
@ -44,276 +44,118 @@ AUX_ADC_PORT_A = 2
|
|||
AUX_ADC_PORT_B = 3
|
||||
|
||||
|
||||
def main_adc_config(test_pattern):
|
||||
def spi_write(spi, address, value):
|
||||
spi.xfer2([address, value])
|
||||
|
||||
def spi_read(spi, address):
|
||||
rx_buffer = spi.xfer2([0x80 | address, 0x00])
|
||||
return rx_buffer[1]
|
||||
|
||||
def main_adc_config(spi, test_pattern):
|
||||
high_word = (test_pattern & 0xFF00) >> 8
|
||||
low_word = test_pattern & 0xFF
|
||||
|
||||
spi = spidev.SpiDev()
|
||||
spi_write(spi, 0x00, 0x80) # reset
|
||||
spi_write(spi, 0x01, 0x20) # REGISTER A1: set to Two's complement Data Format
|
||||
spi_write(spi, 0x02, 0x15) # REGISTER A2: set to LVDS output, set 4 data lanes and turn on test mode
|
||||
spi_write(spi, 0x03, high_word) # REGISTER A3: test pattern high word
|
||||
spi_write(spi, 0x04, low_word) # REGISTER A4: test pattern low word
|
||||
|
||||
try:
|
||||
spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
|
||||
spi.max_speed_hz = 50000
|
||||
spi.mode = 0b00 # CPOL = 0 CPHA = 0
|
||||
spi.cshigh = False
|
||||
# spi.read0 = False
|
||||
def main_adc_test_mode(spi, enable):
|
||||
reg_contents = 0x15 if enable else 0x11 # set to LVDS output, set 4 data lanes and turn on or off test mode
|
||||
spi_write(spi, 0x02, reg_contents)
|
||||
|
||||
spi_buffer = [0x00, 0x80] # reset
|
||||
rx_buffer = [0x00, 0x00]
|
||||
def verify_adc_registers(spi, reg_to_check):
|
||||
for register, expected_value in reg_to_check.items():
|
||||
value = spi_read(spi, register)
|
||||
print(f"Spi readback register 0x{register:02x}: 0x{value:02x}")
|
||||
if value != expected_value:
|
||||
print(f"Different value read than sent in reg 0x{register:02x}")
|
||||
|
||||
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 = False
|
||||
# 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
|
||||
def read_frame():
|
||||
return read_from_memory(ADC_FRAME_ADDR, 1)[0]
|
||||
|
||||
def perform_bitslip():
|
||||
for i in range(4):
|
||||
current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
|
||||
current_frame = read_frame()
|
||||
if current_frame != 0x0C:
|
||||
print(
|
||||
f"Performing bitslip (bitslip iteration: {i}). Reason: current_frame is 0x{current_frame:02x} instead of 0x0C"
|
||||
)
|
||||
print(f"Performing bitslip (iteration: {i}). Current frame: 0x{current_frame:02x}")
|
||||
write_to_memory(ADC_BITSLIP_ADDR, 1)
|
||||
else:
|
||||
print(f"No bitslip required; Currernt frame = 0x{current_frame:02x}")
|
||||
break
|
||||
print(f"No bitslip required; Current frame: 0x{current_frame:02x}")
|
||||
return
|
||||
|
||||
current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
|
||||
prev_frame = current_frame
|
||||
|
||||
for i in range(32):
|
||||
def find_edge():
|
||||
prev_frame = read_frame()
|
||||
transition = False
|
||||
for tap_delay 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]
|
||||
current_frame = read_frame()
|
||||
|
||||
print(f"Tap delay: {tap_delay}")
|
||||
print(f"Current frame: 0x{current_frame:02x}")
|
||||
print(f"Tap delay: {tap_delay}, 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
|
||||
if current_frame != prev_frame:
|
||||
if not transition:
|
||||
transition = True
|
||||
else:
|
||||
final_delay = (tap_delay // 2) + 2
|
||||
print(f"Edge detected; setting iDelay to: {final_delay}")
|
||||
write_to_memory(ADC_DELAY_ADDR, final_delay)
|
||||
return
|
||||
|
||||
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")
|
||||
# If no edge detected
|
||||
final_delay = 11
|
||||
print(f"No edge detected; setting iDelay to: {final_delay}")
|
||||
write_to_memory(ADC_DELAY_ADDR, final_delay)
|
||||
|
||||
adc_ch0 = read_from_memory(ADC_CH0_HIGH_ADDR, 4)
|
||||
print(f"ADC_CH0: 0x{adc_ch0}")
|
||||
def read_adc_channel(high_addr, low_addr):
|
||||
return (read_from_memory(high_addr, 1)[0] << 8) | read_from_memory(low_addr, 1)[0]
|
||||
|
||||
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]
|
||||
def print_adc_channels():
|
||||
adc_ch0 = read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
|
||||
adc_ch1 = read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
|
||||
print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
|
||||
print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
|
||||
|
||||
def enable_adc_afe(ch1_x10=False, ch2_x10=False):
|
||||
ctrl_value = (ch2_x10 << 1) | ch1_x10
|
||||
write_to_memory(ADC_AFE_CTRL_ADDR, ctrl_value)
|
||||
afe_ctrl = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0]
|
||||
print(f"ADC_AFE_CTRL: 0x{afe_ctrl:02X}")
|
||||
return afe_ctrl
|
||||
|
||||
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)
|
||||
|
||||
def configure_ltc2195():
|
||||
spi = spidev.SpiDev()
|
||||
try:
|
||||
spi.open(1, 3) # AUX ADC 1?
|
||||
spi.max_speed_hz = 5000
|
||||
spi.mode = 0b00
|
||||
spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
|
||||
spi.max_speed_hz = 50000
|
||||
spi.mode = 0b00 # CPOL = 0 CPHA = 0
|
||||
spi.cshigh = False
|
||||
|
||||
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
|
||||
test_pattern = 0x811F
|
||||
main_adc_config(spi, test_pattern)
|
||||
|
||||
verify_adc_registers(spi, {
|
||||
0x01: 0x20,
|
||||
0x02: 0x15,
|
||||
0x03: (test_pattern & 0xFF00) >> 8,
|
||||
0x04: test_pattern & 0xFF
|
||||
})
|
||||
|
||||
# Performing Word Align
|
||||
perform_bitslip()
|
||||
find_edge()
|
||||
print_adc_channels()
|
||||
|
||||
main_adc_test_mode(spi, False)
|
||||
verify_adc_registers(spi, {0x02: 0x11}) # Verify test mode is off
|
||||
|
||||
enable_adc_afe()
|
||||
|
||||
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()
|
||||
configure_ltc2195()
|
||||
Loading…
Reference in New Issue