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Phaser upconverter: Follow datasheet procedure for VCO calibration (close #1643)

Signed-off-by: Marius Weber <marius.weber@physics.ox.ac.uk>
This commit is contained in:
Marius Weber 2021-04-02 14:32:42 +01:00
parent 7404152e4c
commit 1c96797de5
2 changed files with 34 additions and 4 deletions

View File

@ -323,6 +323,7 @@ class Phaser:
delay(.2*ms)
for data in channel.trf_mmap:
channel.trf_write(data)
channel.cal_trf_vco()
delay(2*ms) # lock
if not (self.get_sta() & (PHASER_STA_TRF0_LD << ch)):
@ -331,6 +332,7 @@ class Phaser:
if channel.trf_read(0) & 0x1000:
raise ValueError("TRF R_SAT_ERR")
delay(.1*ms)
channel.en_trf_out()
# enable dac tx
self.set_cfg(clk_sel=self.clk_sel)
@ -689,6 +691,7 @@ class PhaserChannel:
self.phaser = phaser
self.index = index
self.trf_mmap = TRF372017(trf).get_mmap()
self.oscillator = [PhaserOscillator(self, osc) for osc in range(5)]
@kernel
@ -891,6 +894,32 @@ class PhaserChannel:
return self.trf_write(0x00000008 | (cnt_mux_sel << 27),
readback=True)
@kernel
def cal_trf_vco(self):
"""Start calibration of the upconverter (hardware variant) VCO.
TRF outputs should be disabled during VCO calibration.
"""
self.trf_write(self.trf_mmap[1] | (1 << 31))
@kernel
def en_trf_out(self, rf=1, lo=0):
"""Enable the rf/lo outputs of the upconverter (hardware variant).
:param rf: 1 to enable RF output, 0 to disable
:param lo: 1 to enable LO output, 0 to disable
"""
data = self.trf_read(0xc)
delay(0.1 * ms)
# set RF and LO output bits
data = data | (1 << 12) | (1 << 13) | (1 << 14)
# clear to enable output
if rf == 1:
data = data ^ (1 << 14)
if lo == 1:
data = data ^ ((1 << 12) | (1 << 13))
self.trf_write(data)
class PhaserOscillator:
"""Phaser IQ channel oscillator (NCO/DDS).

View File

@ -17,7 +17,7 @@ class TRF372017:
vco_sel = 2 # 2b
vcosel_mode = 0
cal_acc = 0b00 # 2b
en_cal = 1
en_cal = 0 # leave at 0 - calibration is performed in `Phaser.init()`
nfrac = 0 # 25b
@ -27,9 +27,9 @@ class TRF372017:
pwd_vcomux = 0
pwd_div124 = 0
pwd_presc = 0
pwd_out_buff = 1
pwd_lo_div = 1
pwd_tx_div = 0
pwd_out_buff = 1 # leave at 1 - only enable outputs after calibration
pwd_lo_div = 1 # leave at 1 - only enable outputs after calibration
pwd_tx_div = 1 # leave at 1 - only enable outputs after calibration
pwd_bb_vcm = 0
pwd_dc_off = 0
en_extvco = 0
@ -84,6 +84,7 @@ class TRF372017:
setattr(self, key, value)
def get_mmap(self):
"""Memory map for TRF372017"""
mmap = []
mmap.append(
0x9 |