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-rw-r--r--doc/protocol4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/protocol b/doc/protocol
index c7c4849..e99aca9 100644
--- a/doc/protocol
+++ b/doc/protocol
@@ -1,5 +1,5 @@
<command> ::= <opcode> " " <args> "\n"
-<response> ::= (<retval> | "nack") "\n"
+<response> ::= (<retval> | "nack" <err>) "\n"
Echo:
<opcode> ::= "e"
@@ -22,3 +22,5 @@ Read EEPROM:
<bytes> ::= <byte> <bytetail> | ""
<bytetail> ::= " " <byte> <bytetail> | ""
<byte> ::= "00"--"FF"
+<err> ::= <char> <err> | ""
+<char> ::= [a-zA-Z0-9_ ]