From 352a06ba4574b1211ef4df63d626e7041f6c5894 Mon Sep 17 00:00:00 2001
From: Gijs Schoonderbeek <schoonderbeek@astron.nl>
Date: Tue, 10 Jan 2023 11:25:30 +0100
Subject: [PATCH] Added PPS check
---
apsct_lib.py | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/apsct_lib.py b/apsct_lib.py
index e306a62..8bb7a19 100644
--- a/apsct_lib.py
+++ b/apsct_lib.py
@@ -17,6 +17,7 @@ Set APSCT_CLK
import sys
import APSCT_I2C
import time
+import RPi.GPIO as gpio
sys.path.insert(0, '.')
import os
if os.name == "posix":
@@ -39,6 +40,7 @@ class ApsctClass:
self.pll_200 = PllClass("200MHz")
self.pll_160 = PllClass("160MHz")
self.sensors = ApsctSensors()
+ self.pps = PpsClass()
def read_IO_expanderis(self):
#
@@ -100,6 +102,7 @@ class ApsctClass:
# Check voltages, temp and lock on APSCT
#
result = self.sensors.check_values()
+ result = result & self.pps.check_timing()
if self.frequency == "200MHz":
self.pll_200.read_lock()
lock = self.pll_200.lock
@@ -437,3 +440,48 @@ class ApsctSensors:
else:
self.temperature = 9999
return self.temperature
+
+class PpsClass:
+ #
+ # Class to check the PPS signal
+ #
+ def __init__(self):
+ #
+ # Whats needed to measure the toggle on GPIO24
+ #
+ gpio.setmode(gpio.BCM)
+ gpio.setup(24, gpio.IN)
+ self.pps_time = 999
+
+ def time_pps(self):
+ gpio.wait_for_edge(24, gpio.RISING)
+ a = time()
+ gpio.wait_for_edge(24, gpio.RISING)
+ b = time()
+ self.pps_time = (b-a)/2
+ return self.pps_time
+
+ def check_pps(self):
+ gpio.add_event_detect(24, gpio.RISING)
+ sleep(5)
+ pps_ok = gpio.event_detected(24)
+ gpio.remove_event_detect(24)
+ return pps_ok
+
+ def print_pps(self):
+ if self.check_pps():
+ print(f"Time between pps is {self.time_pps():4.2f} s")
+ else:
+ print("No PPS found")
+
+ def check_timing(self):
+ print("Check pps timing", end = "" )
+ self.timing = False
+ if not self.check_pps():
+ print(" no pps")
+ return False
+ timepps = self.time_pps()
+ if (0.9 < timepps < 1.1):
+ print(f", timing is OK: {timepps:4.2f} s")
+ self.timing = True
+ return self.timing
--
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