From: Uwe Hermann <redacted>
Date: Sun, 2 Feb 2014 20:10:23 +0000 (+0100)
Subject: spi: Throw an error if neither MISO nor MOSI was supplied.
X-Git-Tag: libsigrokdecode-0.3.0~110
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=9ed115003c754ed2af523af98d22123cee6e99d3

spi: Throw an error if neither MISO nor MOSI was supplied.
---

diff --git a/decoders/spi/pd.py b/decoders/spi/pd.py
index cd40946..3bebc7d 100644
--- a/decoders/spi/pd.py
+++ b/decoders/spi/pd.py
@@ -266,6 +266,10 @@ class Decoder(srd.Decoder):
             self.have_mosi = (mosi in (0, 1))
             self.have_cs = (cs in (0, 1))
 
+            # Either MISO or MOSI (but not both) can be omitted.
+            if not (self.have_miso or self.have_mosi):
+                raise Exception('Either MISO or MOSI (or both) pins required.')
+
             # State machine.
             if self.state == 'IDLE':
                 self.find_clk_edge(miso, mosi, clk, cs)