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stc15: use generic/new sync sequence for handshake

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Use the newer sync sequence. Refactor the pulse() function to make
it somewhat generic, so we can use it without worrying about writing
the exactly right number of bytes.

This seems to get STC15W4 series chips working.
This commit is contained in:
Grigori Goronzy 2015-12-11 00:36:47 +01:00
parent 432fed8af1
commit 9f42ef29f3
1 changed files with 9 additions and 7 deletions
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16
stcgal/protocols.py
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@ -662,13 +662,17 @@ class StcBaseProtocol:
print("Target frequency: %.3f MHz" % (self.mcu_clock_hz / 1E6))
print("Target BSL version: %s" % self.mcu_bsl_version)
def pulse(self):
"""Send a sequence of 0x7f bytes for synchronization"""
def pulse(self, character=b"\x7f", timeout=0):
"""Send a sequence of bytes for synchronization with MCU"""
duration = 0
while True:
self.ser.write(b"\x7f")
if timeout > 0 and duration > timeout:
raise serial.SerialTimeoutException("pulse timeout")
self.ser.write(character)
self.ser.flush()
time.sleep(0.015)
duration += 0.015
if self.ser.inWaiting() > 0: break
def initialize_model(self):
@ -1735,8 +1739,7 @@ class Stc15Protocol(Stc15AProtocol):
packet += bytes([0x00, 0x40, 0x80, 0x40, 0xff, 0x40])
packet += bytes([0x00, 0x00, 0x80, 0x00, 0xc0, 0x00])
self.write_packet(packet)
self.ser.write(bytes([0x92, 0x92, 0x92, 0x92]))
self.ser.flush()
self.pulse(b"\xfe", timeout=1.0)
response = self.read_packet()
if response[0] != 0x00:
raise StcProtocolException("incorrect magic in handshake packet")
@ -1755,8 +1758,7 @@ class Stc15Protocol(Stc15AProtocol):
for i in range(prog_trim[0] - 3, prog_trim[0] + 3):
packet += bytes([i & 0xff, prog_trim[1]])
self.write_packet(packet)
self.ser.write(bytes([0x92, 0x92, 0x92, 0x92]))
self.ser.flush()
self.pulse(b"\xfe", timeout=1.0)
response = self.read_packet()
if response[0] != 0x00:
raise StcProtocolException("incorrect magic in handshake packet")