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stc12: fix detection of illegal baudrates

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Grigori Goronzy 2014-01-23 15:08:24 +01:00
parent 1bd2ec9cbe
commit ca1bd4dcab
1 changed files with 4 additions and 4 deletions
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8
stcgal.py
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@ -1211,13 +1211,13 @@ class Stc12Protocol(StcBaseProtocol):
# baudrate is directly controlled by programming the MCU's BRT register # baudrate is directly controlled by programming the MCU's BRT register
brt = 256 - round((self.mcu_clock_hz) / (self.baud_transfer * 16)) brt = 256 - round((self.mcu_clock_hz) / (self.baud_transfer * 16))
if brt <= 1 or brt > 255:
raise StcProtocolException("requested baudrate cannot be set")
brt_csum = (2 * (256 - brt)) & 0xff brt_csum = (2 * (256 - brt)) & 0xff
try: baud_actual = (self.mcu_clock_hz) / (16 * (256 - brt)) baud_actual = (self.mcu_clock_hz) / (16 * (256 - brt))
except ZeroDivisionError:
raise StcProtocolException("requested baudrate too high for target")
baud_error = (abs(self.baud_transfer - baud_actual) * 100.0) / self.baud_transfer baud_error = (abs(self.baud_transfer - baud_actual) * 100.0) / self.baud_transfer
if baud_error > 5.0: if baud_error > 5.0:
print("WARNING: baud rate error is %.2f%%. You may need to set a slower rate." % print("WARNING: baudrate error is %.2f%%. You may need to set a slower rate." %
baud_error, file=sys.stderr) baud_error, file=sys.stderr)
# IAP wait states (according to datasheet(s)) # IAP wait states (according to datasheet(s))