From 9821622af021360a92334d1a6b465c8e3aab90b6 Mon Sep 17 00:00:00 2001 From: Stefan Brüns Date: Tue, 1 Dec 2015 06:48:02 +0100 Subject: usb_signalling: add signaling states needed after LS PREamble PID --- decoders/usb_signalling/pd.py | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'decoders/usb_signalling/pd.py') diff --git a/decoders/usb_signalling/pd.py b/decoders/usb_signalling/pd.py index 4dfde83..8225ae7 100644 --- a/decoders/usb_signalling/pd.py +++ b/decoders/usb_signalling/pd.py @@ -69,10 +69,22 @@ symbols = { (0, 1): 'LS_J', (1, 1): 'SE1', }, +# After a PREamble PID, the bus segment between Host and Hub uses LS signalling +# rate and FS signalling polarity (USB 2.0 spec, 11.8.4: "For both upstream and +# downstream low-speed data, the hub is responsible for inverting the polarity of +# the data before transmitting to/from a low-speed port." + 'low-speed-rp': { + # (, ): + (0, 0): 'SE0', + (1, 0): 'J', + (0, 1): 'K', + (1, 1): 'SE1', + }, } bitrates = { 'low-speed': 1500000, # 1.5Mb/s (+/- 1.5%) + 'low-speed-rp': 1500000, # 1.5Mb/s (+/- 1.5%) 'full-speed': 12000000, # 12Mb/s (+/- 0.25%) 'automatic': None } @@ -227,7 +239,7 @@ class Decoder(srd.Decoder): # Got an EOP. self.putpm(['EOP', None]) self.putm([5, ['EOP', 'E']]) - self.state = 'IDLE' + self.state = 'WAIT IDLE' else: self.putpm(['ERR', None]) self.putm([8, ['EOP Error', 'EErr', 'E']]) -- cgit v1.2.3-70-g09d2