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examples/python/adcTest.py

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+#!/usr/bin/env python
+# coding: utf-8
+
+'''
+@disc:  ADC readout Sensor Test (Analog Devices LTC2308)
+        Fast way over the virtual memory
+           
+@date:   21.01.2020
+@device: Intel Cyclone V 
+@author: Robin Sebastian
+         (https://github.com/robseb)
+'''
+import os
+import time
+import math
+import sys
+# 
+# This demo uses the python class "devmen" (https://github.com/kylemanna/pydevmem)
+# be sure that this file is on the same directory 
+#
+import devmem
+
+# Demo duration  
+TEST_DURATIONS  =30
+
+# the Lightweight HPS-to-FPGA Bus base address offset
+HPS_LW_ADRS_OFFSET = 0xFF200000 
+
+# LTC2308 Address offset
+ADC_ADDRES_OFFSET = 0x40
+
+# Register set of the LTC2308
+ADC_CMD_REG_OFFSET  = 0x0
+ADC_DATA_REG_OFFSET = 0x4
+
+#### Used ADC Channel 
+# Select here the ADC Channel for this Demo 
+ADC_CH = 1
+##
+
+### FIFO Convention Data Size for average calculation
+FIFO_SIZE = 255 # MAX=1024 
+
+VALUE_OR_VOLTAGE_OUTPUT = 0 # 1: Raw Value output | 0: Volage
+
+if __name__ == '__main__':
+    print("ADC readout Demo for LTC2308 ADC with Channel "+str(ADC_CH))
+
+    # The ADC is only supported with rsYocto Version 1.031 or later
+    versionNo = 0
+    # The rsYocto Version Number is located here: "/usr/rsyocto/version.txt"
+    if os.path.isfile("/usr/rsyocto/version.txt"):
+        versionStr = ""
+        with open("/usr/rsyocto/version.txt", "r") as f:
+            versionStr = f.read()
+        # Convert String to int
+        try: 
+            versionNo = float(versionStr)
+        except ValueError:
+            print("Warning: Failed to read rsYocto Version")
+
+    if not versionNo > 1.031:
+        print("Error: The ADC is only supported with rsYocto Version 1.031 or later ")
+        print(" This Version is: "+versionStr)
+        sys.exit()
+
+    # open the memory Access to the Lightweight HPS-to-FPGA bridge
+    #                  (Base address, byte length to acceses, interface)
+    de = devmem.DevMem(HPS_LW_ADRS_OFFSET, ADC_ADDRES_OFFSET+0x8, "/dev/mem")
+
+    # Enter test loop
+    for var in range(TEST_DURATIONS):
+
+        # Set meassure number for ADC convert
+        de.write(ADC_ADDRES_OFFSET+ADC_DATA_REG_OFFSET,[FIFO_SIZE])
+        # Enable the convention with CH0 
+        de.write(ADC_ADDRES_OFFSET+ADC_CMD_REG_OFFSET, [(ADC_CH <<1) | 0x00])
+        de.write(ADC_ADDRES_OFFSET+ADC_CMD_REG_OFFSET, [(ADC_CH <<1) | 0x01])
+        de.write(ADC_ADDRES_OFFSET+ADC_CMD_REG_OFFSET, [(ADC_CH <<1) | 0x00])
+
+        timeout = 300 #ms
+        # Wait untis convention is done or timeout
+        while (not(timeout == 0)):
+
+            if(de.read(ADC_ADDRES_OFFSET+ADC_CMD_REG_OFFSET,1)[0] & (1<<0)): 
+                break
+
+            timeout = timeout -1
+            time.sleep(.001) # delay 1ms 
+
+        # Avarage FIFO values
+        rawValue = 0
+        for i in range(FIFO_SIZE): 
+            rawValue = rawValue+ (de.read(ADC_ADDRES_OFFSET+ADC_DATA_REG_OFFSET,1))[0]
+
+        value = rawValue / FIFO_SIZE
+
+        if VALUE_OR_VOLTAGE_OUTPUT:
+            value = round(value,2)
+            print("ADC AVG: "+str(value))
+        else: 
+            # Convert ADC Value to Volage
+            volage = round(value/1000,2)
+            print("U AVG: "+str(volage)+"V")
+
+        time.sleep(.2) # 200ms delay
+
+print('End of demo...')