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Decoder sdcard: trigger the decoding on clock raising edge

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This improves the decoding speed a lot (~8x faster), especially
when using a high sampling rate.
This commit is contained in:
Pierre-Olivier Vauboin 2021-02-15 18:45:14 +01:00
parent 5d92bd50f1
commit ce545fa88c
1 changed files with 9 additions and 10 deletions
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19
libsigrokdecode4DSL/decoders/sdcard_sd/pd.py
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@ -525,15 +525,19 @@ class Decoder(srd.Decoder):
def decode(self): def decode(self):
while True: while True:
conds = {Pin.CLK: 'r'}
# Wait for start bit (CMD = 0).
if ((self.state == St.GET_COMMAND_TOKEN or
self.state.value.startswith('GET_RESPONSE')) and
(len(self.token) == 0)):
conds.update({Pin.CMD: 'l'})
# Wait for a rising CLK edge. # Wait for a rising CLK edge.
(cmd_pin, clk, dat0, dat1, dat2, dat3) = self.wait({Pin.CLK: 'r'}) (cmd_pin, clk, dat0, dat1, dat2, dat3) = self.wait(conds)
# State machine. # State machine.
if self.state == St.GET_COMMAND_TOKEN: if self.state == St.GET_COMMAND_TOKEN:
if len(self.token) == 0:
# Wait for start bit (CMD = 0).
if cmd_pin != 0:
continue
self.get_command_token(cmd_pin) self.get_command_token(cmd_pin)
elif self.state.value.startswith('HANDLE_CMD'): elif self.state.value.startswith('HANDLE_CMD'):
# Call the respective handler method for the command. # Call the respective handler method for the command.
@ -544,12 +548,7 @@ class Decoder(srd.Decoder):
if self.is_acmd and cmdstr not in ('55', '63'): if self.is_acmd and cmdstr not in ('55', '63'):
self.is_acmd = False self.is_acmd = False
elif self.state.value.startswith('GET_RESPONSE'): elif self.state.value.startswith('GET_RESPONSE'):
if len(self.token) == 0:
# Wait for start bit (CMD = 0).
if cmd_pin != 0:
continue
# Call the respective handler method for the response. # Call the respective handler method for the response.
s = 'handle_response_%s' % self.state.value[13:].lower() s = 'handle_response_%s' % self.state.value[13:].lower()
handle_response = getattr(self, s) handle_response = getattr(self, s)
handle_response(cmd_pin) handle_response(cmd_pin)