kopia lustrzana https://github.com/peterhinch/micropython-samples
DS3231 setting RTC accuracy improved
rodzic
eea1614115
commit
5371d0c213
|
@ -13,7 +13,7 @@ rtc = pyb.RTC()
|
|||
|
||||
def now(): # Return the current time from the RTC in secs and millisecs from year 2000
|
||||
secs = utime.time()
|
||||
ms = 1000*(255 -rtc.datetime()[7]) >> 8
|
||||
ms = 1000 * (255 -rtc.datetime()[7]) >> 8
|
||||
if ms < 50: # Might have just rolled over
|
||||
secs = utime.time()
|
||||
return secs, ms
|
||||
|
@ -21,7 +21,7 @@ def now(): # Return the current time from the RTC in secs and millisecs from ye
|
|||
# Driver for DS3231 accurate RTC module (+- 1 min/yr) needs adapting for Pyboard
|
||||
# source https://github.com/scudderfish/uDS3231
|
||||
def bcd2dec(bcd):
|
||||
return (((bcd & 0b11110000)>>4)*10 + (bcd & 0b00001111))
|
||||
return (((bcd & 0xf0) >> 4) * 10 + (bcd & 0x0f))
|
||||
|
||||
def dec2bcd(dec):
|
||||
t = dec // 10
|
||||
|
@ -42,11 +42,14 @@ class DS3231:
|
|||
raise DS3231Exception("DS3231 not found on I2C bus at %d" % DS3231_I2C_ADDR)
|
||||
|
||||
def get_time(self, set_rtc = False):
|
||||
data = self.ds3231.mem_read(7, DS3231_I2C_ADDR, 0)
|
||||
ss=bcd2dec(data[0])
|
||||
mm=bcd2dec(data[1])
|
||||
if set_rtc:
|
||||
data = self.await_transition() # For accuracy set RTC immediately after a seconds transition
|
||||
else:
|
||||
data = self.ds3231.mem_read(7, DS3231_I2C_ADDR, 0) # don't wait
|
||||
ss = bcd2dec(data[0])
|
||||
mm = bcd2dec(data[1])
|
||||
if data[2] & 0x40:
|
||||
hh=bcd2dec(data[2] & 0x1f)
|
||||
hh = bcd2dec(data[2] & 0x1f)
|
||||
if data[2] & 0x20:
|
||||
hh += 12
|
||||
else:
|
||||
|
@ -82,9 +85,10 @@ class DS3231:
|
|||
|
||||
def await_transition(self):
|
||||
data = self.ds3231.mem_read(7, DS3231_I2C_ADDR, 0)
|
||||
ss= data[0]
|
||||
ss = data[0]
|
||||
while ss == data[0]:
|
||||
data = self.ds3231.mem_read(7, DS3231_I2C_ADDR, 0) # Aawait a seconds transition
|
||||
data = self.ds3231.mem_read(7, DS3231_I2C_ADDR, 0) # Await a seconds transition
|
||||
return data
|
||||
|
||||
# Get calibration factor for Pyboard RTC. Note that the DS3231 doesn't have millisecond resolution so we
|
||||
# wait for a seconds transition to emulate it.
|
||||
|
|
Ładowanie…
Reference in New Issue