From 8694859ac22c109b0ca5d6da17d306a504fcf3e4 Mon Sep 17 00:00:00 2001
From: Gijs Schoonderbeek <schoonderbeek@astron.nl>
Date: Wed, 11 Jan 2023 18:51:19 +0100
Subject: [PATCH] Modificatino during test esp. voltage sensor
---
I2C_serial_pi.py | 8 ++++----
apsct_lib.py | 32 +++++++++++++++++++-------------
2 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/I2C_serial_pi.py b/I2C_serial_pi.py
index bcd3694..7d22124 100644
--- a/I2C_serial_pi.py
+++ b/I2C_serial_pi.py
@@ -55,7 +55,7 @@ class I2C:
return ret_ack, ret_value
- def read_last_reg(self, bytes_to_read):
+ def read_last_reg(self, bytes_to_read, print_on = DEBUG):
bus = smbus.SMBus(self.bus_nr)
rd_value = []
ret_value = ''
@@ -68,12 +68,12 @@ class I2C:
except IOError:
ret_ack = 0
rd_value.append(0)
- if DEBUG:
- print("Reading error")
+ if print_on:
+ print(f"Reading IOerror {rd_value}")
except err:
ret_ack = 0
rd_value.append(0)
- if DEBUG:
+ if print_on:
print("Reading error")
for cnt in range(bytes_to_read):
ret_value += (hex(rd_value[cnt])[2:])
diff --git a/apsct_lib.py b/apsct_lib.py
index 0b2d17d..f6b0a25 100644
--- a/apsct_lib.py
+++ b/apsct_lib.py
@@ -406,6 +406,8 @@ class ApsctSensors:
if not (15 < self.temperature < 50):
result = False
print(f"Error temperature read {self.temperature:4.2f} °C")
+ else:
+ print(f"OK temperature read {self.temperature:4.2f} °C")
return result
def read_voltage(self, input_channel=0):
@@ -422,9 +424,8 @@ class ApsctSensors:
if DEBUG:
stri = "Word to select sens input is 0x{0:x}".format(channel_select_word)
print(stri)
- sleep(0.2)
self.dev_i2c_sensor.write_bytes(channel_select_word, 0xB8)
- sleep(0.2)
+ sleep(0.3) # Wait for device to take snapshot
ret_ack, ret_value = self.dev_i2c_sensor.read_last_reg(3)
if DEBUG:
stri = "Return value input 0 : 0x{0} ".format(ret_value)
@@ -434,10 +435,11 @@ class ApsctSensors:
else:
steps = (int(ret_value, 16) & 0x1FFFFF) >> 6
voltage = one_step * steps
- voltage = ((4.7+2.2)/2.2)*2*voltage
+ voltage = ((4.7+2.2)/2.2)*2*voltage # Resistor network + half swing
if DEBUG:
string = "Voltage sens line {1} is {0:.4f} V".format(voltage, input_channel)
print(string)
+ sleep(0.2) # wait for device to go to sleep
return voltage
def read_temp(self):
@@ -448,16 +450,20 @@ class ApsctSensors:
#
Vref = 3.0
temp_slope = 93.5E-6 * 2**(16+1) / Vref
- sleep(1.0)
- self.dev_i2c_sensor.write_bytes(0xA0, 0xC0)
- sleep(1.0)
- ret_ack, ret_value = self.dev_i2c_sensor.read_last_reg(3)
- if ret_ack:
- raw_value = (int(ret_value, 16) & 0x1FFFFF) >> 6
- temperature_K = (raw_value/temp_slope)
- self.temperature = temperature_K-273
- else:
- self.temperature = 9999
+ ret_ack = self.dev_i2c_sensor.write_bytes(0xA0, 0xC0)
+ sleep(0.5)
+ self.temperature = 9999
+ loops = 0
+ while (self.temperature > 100 ) & (loops < 2):
+ loops = loops + 1
+ ret_ack, ret_value = self.dev_i2c_sensor.read_last_reg(3)
+ if ret_ack:
+ raw_value = (int(ret_value, 16) & 0x1FFFFF) >> 6
+ temperature_K = (raw_value/temp_slope)
+ self.temperature = temperature_K-273
+ else:
+ self.temperature = 9999
+ sleep(0.2)
return self.temperature
class PpsClass:
--
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