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test write_sample

This commit is contained in:
Florian Agbuya 2024-08-29 17:16:10 +08:00
parent ba07d6a7de
commit 0927824c61
1 changed files with 43 additions and 9 deletions
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52
fast-servo/pyfastservo/dac.py
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@ -100,16 +100,30 @@ def power_down(channel, power_down=True):
reg_contents = read_from_memory(CTRL_ADDR, 1)[0] reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
print(f"REG contents: 0b{reg_contents:03b}") print(f"REG contents: 0b{reg_contents:03b}")
def set_dac_output(value): # def set_dac_output(value):
value = min(value, 0x3FFF) # value = min(value, 0x3FFF)
low_word = value & 0xFF # low_word = value & 0xFF
high_word = (value >> 8) & 0x3F # high_word = (value >> 8) & 0x3F
# write_to_memory(CH0_HIGH_WORD_ADDR, high_word)
# write_to_memory(CH0_LOW_WORD_ADDR, low_word)
# write_to_memory(CH1_HIGH_WORD_ADDR, high_word)
# write_to_memory(CH1_LOW_WORD_ADDR, low_word)
# print(f"DAC output set to: 0x{value:04X}")
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)
write_to_memory(CH0_HIGH_WORD_ADDR, high_word)
write_to_memory(CH0_LOW_WORD_ADDR, low_word)
write_to_memory(CH1_HIGH_WORD_ADDR, high_word)
write_to_memory(CH1_LOW_WORD_ADDR, low_word)
print(f"DAC output set to: 0x{value:04X}")
def configure_ad9117(): def configure_ad9117():
spi = spidev.SpiDev() spi = spidev.SpiDev()
@ -134,6 +148,26 @@ def configure_ad9117():
power_down(1, False) power_down(1, False)
manual_override(True) manual_override(True)
# Write sample value 0x1FFF to both channels
sample_value = 0x1FFF
write_sample(0, sample_value) # Write to channel 0
write_sample(1, sample_value) # Write to channel 1
print(f"Sample value 0x{sample_value:04X} written to both channels")
# Read back the values from memory
ch0_high = read_from_memory(CH0_HIGH_WORD_ADDR, 1)[0]
ch0_low = read_from_memory(CH0_LOW_WORD_ADDR, 1)[0]
ch1_high = read_from_memory(CH1_HIGH_WORD_ADDR, 1)[0]
ch1_low = read_from_memory(CH1_LOW_WORD_ADDR, 1)[0]
# Reconstruct the 14-bit values
ch0_value = (ch0_high << 8) | ch0_low
ch1_value = (ch1_high << 8) | ch1_low
print(f"Read back value for channel 0: 0x{ch0_value:04X}")
print(f"Read back value for channel 1: 0x{ch1_value:04X}")
print("AD9117 configuration completed successfully") print("AD9117 configuration completed successfully")
return True return True