M-Labs
/
nix-servo
3
1
Fork 2
Code Issues Pull Requests Packages Projects Releases Wiki Activity

pyfastservo dac: reacquire clk relationship at init

This commit is contained in:
linuswck 2024-11-08 13:09:05 +08:00
parent 560b28508c
commit 5d55ab4c9c
1 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fast-servo/pyfastservo/dac.py
View File

@ -63,7 +63,10 @@ def configure_dac(spi):
spi_write(spi, 0x07, 0xA0) # Enable on-chip QRSET (1.6 kΩ for 20mA output) spi_write(spi, 0x07, 0xA0) # Enable on-chip QRSET (1.6 kΩ for 20mA output)
spi_write(spi, 0x05, 0x00) # Disable internal IRCML spi_write(spi, 0x05, 0x00) # Disable internal IRCML
spi_write(spi, 0x08, 0x00) # Disable internal QRCML spi_write(spi, 0x08, 0x00) # Disable internal QRCML
spi_write(spi, 0x02, 0xB4) # Enable 2's complement, LVDS interface, 4 LVDS lanes spi_write(spi, 0x02, 0xB4) # Enable 2's complement, IFirst: True, IRising: True, DCI_EN: Enabled
spi_write(spi, 0x14, 0x00)
spi_write(spi, 0x14, 0x08) # Trigger the retimer to reacquire the clock relationship
spi_write(spi, 0x14, 0x00)
def dac_self_calibration(spi): def dac_self_calibration(spi):
spi_write(spi, 0x12, 0x00) # Reset calibration status spi_write(spi, 0x12, 0x00) # Reset calibration status
@ -111,6 +114,16 @@ def set_dac_output(value):
write_to_memory(CH1_LOW_WORD_ADDR, low_word) write_to_memory(CH1_LOW_WORD_ADDR, low_word)
print(f"DAC output set to: 0x{value:04X}") print(f"DAC output set to: 0x{value:04X}")
def check_clk_relationship(spi):
clkmode_reg = spi_read(spi, 0x14)
print(f"CLKMODE reg: 0x{clkmode_reg:02X}")
if clkmode_reg & 0b00010000:
print("Clock relationship is not found")
return False
else:
print("Clock relationship is found")
return True
def configure_ad9117(): def configure_ad9117():
spi = spidev.SpiDev() spi = spidev.SpiDev()
spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE) spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE)
@ -125,6 +138,7 @@ def configure_ad9117():
return False return False
configure_dac(spi) configure_dac(spi)
check_clk_relationship(spi)
dac_self_calibration(spi) dac_self_calibration(spi)
# Enable DAC outputs # Enable DAC outputs