read_current.py

# set_bias.py Converts desired bias voltage to DAC values and sends it to appropriate AFE
#Uses the new SPI slave firmware. Python 3.

import DaphneInterface as ivtools
import argparse
import numpy as np
from tqdm import tqdm
def main(ep,afe,ch,run_type):

    afe = int(afe)
    ch = int(ch)

    device = ivtools.daphne(f"10.73.137.{ep}")

    def DAC_for_V(afe, v):
        if afe==0:
            return abs(round((v-0.053)/0.0394))
        elif afe==1:
            return abs(round((v-0.0447)/0.0391))
        elif afe==2:
            return abs(round((v-0.00945)/0.0392))
        elif afe==3:
            return abs(round((v+0.371)/0.0391))
        elif afe==4:
            return abs(round((v-0.00328)/0.0391))
        else:
            raise ValueError("We only have AFE's 0-4!")
    if run_type == 'warm':
        vlimit = 53
        vrange=[50.5,53]
    elif run_type == 'cold':
        vlimit = 47
        vrange=[40, 47]
    else:
        raise Exception('run_type not recognized. warm or cold are only options')
    print('WR VBIASCTRL V 4095')
    response_data = device.command('WR VBIASCTRL V 4095')
   
    viter = 0.05
    v_list = np.arange(vrange[0], vrange[1], viter)
    current = []
    for v in v_list:
        print(f'v = {v}')
        if v==0:
            dac = 0
        elif v > vlimit:
            raise Exception(f'Cannot set bias higher than {vlimit}')
        else:
            dac = DAC_for_V(afe, v)
        
        CmdString = f"WR AFE {afe} BIASSET V {dac}"
        device.command(CmdString)
        I = device.read_current(8*afe+ch, 15)
        current.append(I)
        print(f'current = {I}')
        #print(device.command('RD VM ALL'))
        #print(device.read_current(0))
        #print(device.read_current(1))
        #print(device.read_current(2))
        #print(device.read_current(3))
        #print(device.read_current(4))
        #print(device.read_current(5))
        #print(device.read_current(6))
        #print(device.read_current(7))

    np.savez('iv_current_cold.npz', current=current, v=v_list)
    device.close()

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='DAPHNE command interpreter')
    parser.add_argument('--ep', required=True, help='DAPHNE IP endpoint, e.g. 110')
    parser.add_argument('--afe', required=True, help='Which AFE are we setting bias for? Number 0-4')
    parser.add_argument('--ch', required=True, help='Which channel to check current? Number 0-7')
    parser.add_argument('--run_type', required=True, help='Run type. Choose warm for warm test and cold for cold test.')
    args = parser.parse_args()
    main(args.ep,args.afe,args.ch, args.run_type)