---
decoders/lpc/pd.py | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/decoders/lpc/pd.py b/decoders/lpc/pd.py
index f9fefd0..9e73b0d 100644
--- a/decoders/lpc/pd.py
+++ b/decoders/lpc/pd.py
@@ -165,7 +165,8 @@ def handle_get_start(self):
# LFRAME# is de-asserted (high). Last START field was last clock cycle,
# we are now reading the CYCTYPE + DIR field.
if self.lframe == 1:
- self.state = 'GET CT/DR'
+ # aborted cycle -> go back to idle state, otherwise read type+dir
+ self.state = 'GET CT/DR' if self.start_field != 0b1111 else 'IDLE'
return
# The last value of LAD[3:0] before LFRAME# gets de-asserted is what
@@ -173,8 +174,11 @@ def handle_get_start(self):
# multiple clocks, and we output all START fields that occur, even
# though the peripherals are supposed to ignore all but the last one.
self.es_block = self.samplenum
- self.putb([1, [fields['START'][self.lad], 'START', 'St', 'S']])
self.start_field = self.lad
+ if self.start_field != 0b1111:
+ self.putb([1, [fields['START'][self.lad], 'START', 'St', 'S']])
+ else:
+ self.putb([1, [fields['START'][self.lad], 'ABORT', 'Ab', 'A']])
self.ss_block = self.samplenum
def handle_get_ct_dr(self):
@@ -341,6 +345,11 @@ def decode(self):
# self.putb([0, ['LAD: %s' % self.lad_bits]])
continue
+ # Check for abort in the middle of a cycle
+ if self.state not in ['IDLE', 'GET START'] and self.lframe != 1:
+ self.putb([0, ['Warning: LFRAME# low in middle of cycle:
aborting']])
+ self.state = 'GET START'
+
# TODO: Only memory read/write is currently supported/tested.
# State machine
--
2.30.2
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