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stc15: handle uncalibrated chips

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This commit is contained in:
Grigori Goronzy 2015-11-24 01:37:22 +01:00
parent ef84cf3cd5
commit d318384c25
1 changed files with 7 additions and 0 deletions
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7
stcgal/protocols.py
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@ -1643,6 +1643,9 @@ class Stc15Protocol(Stc15AProtocol):
self.mcu_clock_hz = self.baud_handshake * count
else:
self.mcu_clock_hz, = struct.unpack(">I", packet[8:12])
# all ones means no calibration
# new chips are shipped without any calibration
if self.mcu_clock_hz == 0xffffffff: self.mcu_clock_hz = 0
# pre-calibrated trim adjust for 24 MHz, range 0x40
self.freq_count_24 = packet[4]
@ -1704,6 +1707,10 @@ class Stc15Protocol(Stc15AProtocol):
"""Calibrate selected user frequency and the high-speed program
frequency and switch to selected baudrate."""
# handle uncalibrated chips
if self.mcu_clock_hz == 0 and self.trim_frequency <= 0:
raise StcProtocolException("uncalibrated, please provide a trim value")
# determine target counters
user_speed = self.trim_frequency
if user_speed <= 0: user_speed = self.mcu_clock_hz