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Damien George cc2a35b7b2 stm32/rtc: Validate the RTC prescaler on boot and change if incorrect. 
Devices with RTC backup-batteries have been shown (very rarely) to have
incorrect RTC prescaler values.  Such incorrect values mean the RTC counts
fast or slow, and will be wrong forever if the power/backup-battery is
always present.

This commit detects such a state at start up (hard reset) and corrects it
by reconfiguring the RTC prescaler values.

Signed-off-by: Damien George <damien@micropython.org>
2020-11-13 11:23:52 +11:00
..
bare-arm ports: Disable MICROPY_PY_ASSIGN_EXPR in bare-arm and minimal ports. 2020-06-16 22:06:21 +10:00
cc3200 ports: Add utime.gmtime() function. 2020-09-18 16:25:36 +10:00
esp32 esp32/machine_pin: Reset pin if init sets mode. 2020-11-12 15:27:41 +11:00
esp8266 esp8266/mpconfigport.h: Seed the urandom module on import. 2020-10-29 14:12:44 +11:00
javascript all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
mimxrt ports: Use correct in/out endpoint size in TUD_CDC_DESCRIPTOR. 2020-10-17 15:49:16 +11:00
minimal ports: Disable MICROPY_PY_ASSIGN_EXPR in bare-arm and minimal ports. 2020-06-16 22:06:21 +10:00
nrf ports: Use correct in/out endpoint size in TUD_CDC_DESCRIPTOR. 2020-10-17 15:49:16 +11:00
pic16bit all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
powerpc powerpc/uart: Choose which UART to use at build time, not runtime. 2020-05-29 22:54:55 +10:00
qemu-arm qemu-arm/Makefile: Add CFLAGS_EXTRA to CFLAGS. 2020-06-22 13:42:24 +10:00
samd ports: Use correct in/out endpoint size in TUD_CDC_DESCRIPTOR. 2020-10-17 15:49:16 +11:00
stm32 stm32/rtc: Validate the RTC prescaler on boot and change if incorrect. 2020-11-13 11:23:52 +11:00
teensy all: Update Python code to conform to latest black formatting. 2020-08-29 15:18:01 +10:00
unix extmod/machine_mem: Only allow integers in machine.memX subscript. 2020-11-13 11:13:37 +11:00
windows unix,windows: Implement mp_hal_time_ns using gettimeofday. 2020-10-01 14:20:42 +10:00
zephyr ports: Support legacy soft I2C/SPI construction via id=-1 arg. 2020-10-01 12:57:10 +10:00