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pyfastservo adc: Add helper fn for phase shifting the dac ddr clock

This commit is contained in:
linuswck 2024-11-08 16:29:49 +08:00
parent 9f2e609b6e
commit bbe09de52c
1 changed files with 52 additions and 1 deletions
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53
fast-servo/pyfastservo/adc.py
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@ -92,7 +92,19 @@ def mmcm_rst():
while not(read_frame() & 0x10):
print(f"Waiting for MMCM to lock")
time.sleep(0.001)
def inc_ddr_clk_phase():
curr_cfg = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0] & 0x1F
write_to_memory(ADC_AFE_CTRL_ADDR, 0x40 | curr_cfg) # Set MMCM Phase Shift to be INC
write_to_memory(ADC_AFE_CTRL_ADDR, 0x60 | curr_cfg) # Assert MMCM Phase Shift EN High
write_to_memory(ADC_AFE_CTRL_ADDR, curr_cfg) # Deassert MMCM Phase Shift EN High
def dec_ddr_clk_phase():
curr_cfg = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0] & 0x1F
write_to_memory(ADC_AFE_CTRL_ADDR, 0x00 | curr_cfg) # Set MMCM Phase Shift to be DEC
write_to_memory(ADC_AFE_CTRL_ADDR, 0x20 | curr_cfg) # Assert MMCM Phase Shift EN High
write_to_memory(ADC_AFE_CTRL_ADDR, curr_cfg) # Deassert MMCM Phase Shift EN High
def find_edge():
prev_frame = read_frame()
for tap_delay in range(32):
@ -131,6 +143,36 @@ def enable_adc_afe(ch1_x10=False, ch2_x10=False):
print(f"ADC_AFE_CTRL: 0x{afe_ctrl:02X}")
return afe_ctrl
def search_edge():
for tap_delay in range(32):
print(f"iDelay to: {tap_delay}")
write_to_memory(ADC_DELAY_ADDR, tap_delay)
time.sleep(1)
current_frame = read_frame()
print(f"Tap delay: {tap_delay}, Current frame: 0x{current_frame:02x}")
print_adc_channels()
def print_adc_channel(ch):
if ch == 0:
adc_ch0 = read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
if ch == 1:
adc_ch1 = read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
def find_min_max_ch(ch):
test = []
for i in range(100):
if ch == 0:
test.append(read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR))
else:
test.append(read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR))
print("ch", ch, hex(test[-1]))
print("Min:", hex(min(test)))
print("Max:", hex(max(test)))
print("Diff:", hex(max(test)-min(test)))
def configure_ltc2195():
spi = spidev.SpiDev()
try:
@ -166,6 +208,15 @@ def configure_ltc2195():
# FIXME: AFE Gain 1x is not functional on that batch of fast servo under development
enable_adc_afe(ch1_x10=1, ch2_x10=1)
#find_min_max_ch(0)
#find_min_max_ch(1)
#for i in range(10):
# print_adc_channel(0)
#for i in range(10):
# print_adc_channel(1)
finally:
spi.close()