From 442d173535ac723442d97c69cbafa22b69f1ae5c Mon Sep 17 00:00:00 2001
From: Martin Teichmann <martin.teichmann@gmail.com>
Date: Fri, 10 Feb 2023 19:42:10 +0000
Subject: [PATCH] support terminals that only read 4 eeprom bytes
some terminals do not support reading 8 bytes of the eeprom at
a time, we have to limit to 4 bytes at a time
---
ebpfcat/ethercat.py | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/ebpfcat/ethercat.py b/ebpfcat/ethercat.py
index e2224e2..5742ecd 100644
--- a/ebpfcat/ethercat.py
+++ b/ebpfcat/ethercat.py
@@ -582,7 +582,13 @@ class Terminal:
busy = 0x8000
while busy & 0x8000:
busy, data = await self.read(0x502, "H4x8s")
- return data
+ if busy & 0x40: # otherwise we actually only read 4 bytes
+ return data
+ await self.write(0x502, "HI", 0x100, start + 2)
+ busy = 0x8000
+ while busy & 0x8000:
+ busy, data2 = await self.read(0x502, "H4x4s")
+ return data[:4] + data2
async def eeprom_write_one(self, start, data):
"""read 2 bytes from the eeprom at `start`"""
--
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