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sipmspi.py
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sipmspi.py
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import Adafruit_BBIO.GPIO as GPIO
from spidev import SpiDev
import time
# chip select map
# 0: nc
# 1: pga
# 2: temp
# 3: mem
CHIP_MAP = { "nc": 0, "pga": 1, "temp": 2, "mem": 3 }
class SipmSPI:
def __init__(self, spinum, sipmpins, chippins):
self.spi = SpiDev(spinum, 0)
self.spi.mode = 3
self.spi.max_speed_hz = 1000000
self.sipmpins = ['P9_%i' % num for num in sipmpins]
self.chippins = ['P9_%i' % num for num in chippins]
for pin in self.sipmpins + self.chippins:
GPIO.setup(pin, GPIO.OUT)
GPIO.output(pin, GPIO.LOW)
def select_sipm(self, sipm_number):
for idx, pin_name in enumerate(self.sipmpins):
if (sipm_number >> idx & 0x1):
GPIO.output(pin_name, GPIO.HIGH)
else:
GPIO.output(pin_name, GPIO.LOW)
#print("sipm %d selected" % sipm_number)
def chip_select(self, key):
chip_num = CHIP_MAP[key]
for idx, pin_name in enumerate(self.chippins):
if (chip_num >> idx & 0x1):
GPIO.output(pin_name, GPIO.HIGH)
else:
GPIO.output(pin_name, GPIO.LOW)
def reset_temperature(self):
self.spi.xfer2([0xff, 0xff, 0xff, 0xff])
#self.spi.xfer2([0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
#time.sleep(0.2)
res = self.spi.xfer2([0x40, 0x00]) # read status register
print("status: 0x%02x" % res[1])
res = self.spi.xfer2([0x48, 0x00]) # read config register
print("status: 0x%02x" % res[1])
res = self.spi.xfer2([0x58, 0x00]) # read ID register
print("status: 0x%02x" % res[1])
def setup_temperature(self):
self.spi.xfer2([0x08, 0x80])
# time.sleep(0.2)
def read_temperature(self):
res = self.spi.xfer2([0x50, 0x00, 0x00])
#temp = (res[1] << 5 | res[2] >> 3) / 16.0
temp = (res[1] << 8 | res[2]) / 128.0
#print("temp: %f deg C" % temp)
return str(temp)
def read_gain(self):
res = self.spi.xfer2([0x83, 0x00])
gain_read = res[1]
#print("old gain readout: %d = %f dB" % (gain_read, 26 - gain_read / 4.0))
return str(gain_read)
def set_gain(self, gain_value):
res = self.spi.xfer2([0x03, gain_value])
res = self.spi.xfer2([0x83, 0x00])
gain_read = res[1]
return str(gain_read)
def check_eeprom_status(self):
res = self.spi.xfer2([0x05, 0x00])
print("eeprom status 0x%02x\n" % res[1])
def read_eeprom_page(self, page):
page <<= 4
cmd = [0x03, page] + [0 for i in range(16)]
res = self.spi.xfer2(cmd)
int_array = res[2:]
#utf8 safety
chr_array = [ ' ' if i==255 else chr(i) for i in int_array]
return ''.join(chr_array)
def write_eeprom_page(self, page, msg):
page <<= 4
#enable write latch
self.spi.xfer2([0x06])
self.check_eeprom_status()
#write page
cmd = [0x02, page] + msg
res = self.spi.xfer2(cmd)
# print(res)
self.check_eeprom_status()
return res
#GPIO.cleanup()
#self.spi.close()
if __name__ == "__main__":
#sipm_list = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
#sipm_list = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
#sipm_list = [8,9,8,9,8,9,8,9,8,9,8,9,8,9,8,9,8,9,8]
#sipm_list = [9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9]
#sipm_list = [8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8]
#sipm_list = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
sipm_list = [5,6]
sspi = SipmSPI(1, sipmpins=[11, 12, 13, 14], chippins=[15, 16])
for sipm in sipm_list:
print("\n")
sspi.select_sipm(sipm)
sspi.chip_select("mem")
# #check_eeprom_status()
# #write_eeprom_page(1, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
print(sspi.read_eeprom_page(1))
time.sleep(0.1)
sspi.chip_select("pga")
print(sspi.read_gain())
print(sspi.set_gain(50))
time.sleep(0.1)
sspi.chip_select("temp")
#reset_temperature()
#setup_temperature()
print sspi.read_temperature()
time.sleep(0.2)
'''
for step in range(30000):
temp_readout = []
for sipm in sipm_list:
select_sipm(sipm)
tmp = read_temperature()
temp_readout.append(tmp)
temp_string = ["%.3f "%(i) for i in temp_readout]
dump_string = datetime.datetime.now().isoformat() + " "
dump_string += "".join(temp_string)
print dump_string
time.sleep(20.0)
'''