L2SS-731: Fix reading of a devices's own attributes

tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py

@@ -191,7 +191,7 @@ class SDP(opcua_device):
     def read_FPGA_processing_error_R(self):
         return self.read_attribute("TR_fpga_mask_R") & (
                  ~self.read_attribute("FPGA_processing_enable_R")
-               | (self.read_attribute("FPGA_boot_image_R") == 0)
+               | (self.read_attribute("FPGA_boot_image_R") <= 0)
                )
 
     def read_FPGA_input_error_R(self):

tangostationcontrol/tangostationcontrol/devices/sdp/sst.py

@@ -115,7 +115,7 @@ class SST(Statistics):
 
     def read_FPGA_processing_error_R(self):
         return self.sdp_proxy.TR_fpga_mask_RW & (
-                 ~self.proxy.FPGA_sst_offload_enable_R
+                 ~self.read_attribute("FPGA_sst_offload_enable_R")
                )
 
     # --------

tangostationcontrol/tangostationcontrol/devices/sdp/xst.py

@@ -239,7 +239,8 @@ class XST(Statistics):
 
     def read_FPGA_processing_error_R(self):
         return self.sdp_proxy.TR_fpga_mask_RW & (
-                 ~self.proxy.FPGA_xst_offload_enable_R
+                 ~self.read_attribute("FPGA_xst_offload_enable_R")
+               | ~self.read_attribute("FPGA_xst_processing_enable_R")
                )
 
     # --------