kopia lustrzana https://github.com/peterhinch/micropython-samples
33 wiersze
1006 B
Python
33 wiersze
1006 B
Python
# Class for pybord watchdog timer
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import stm, pyb
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@micropython.asm_thumb
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def clz(r0):
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clz(r0, r0) # return no. of leading zeros in passed integer
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class wdog(object):
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def start(self, ms):
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assert ms <= 32768 and ms >= 1, "Time value must be from 1 to 32768mS"
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prescaler = 23 - clz(ms -1)
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div_value = ((ms << 3) -1) >> prescaler
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stm.mem16[stm.IWDG + stm.IWDG_KR] = 0x5555
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stm.mem16[stm.IWDG + stm.IWDG_PR] = (stm.mem16[stm.IWDG + stm.IWDG_PR] & 0xfff8) | prescaler
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stm.mem16[stm.IWDG + stm.IWDG_RLR] = (stm.mem16[stm.IWDG + stm.IWDG_RLR] & 0xf000) | div_value
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stm.mem16[stm.IWDG + stm.IWDG_KR] = 0xcccc
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def feed(self):
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stm.mem16[stm.IWDG + stm.IWDG_KR] = 0xaaaa
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def test():
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led = pyb.LED(2)
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led1 = pyb.LED(3)
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dog = wdog()
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dog.start(1000)
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for x in range(10):
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led.toggle()
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pyb.delay(500)
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dog.feed()
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dog.start(4000)
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for x in range(20):
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led1.toggle()
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pyb.delay(500)
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