mbed RTC specifications now dictate that the RTC needs to retain and keep on counting through reset. On Silicon Labs parts, this means the RTC API can not be backed by the Silicon Labs RTC peripheral, since that doesn't provide retention functionality.
Therefore:
* On EFM32GG, EFM32WG, EFM32LG: mbed RTC API is now backed by BURTC.
* On EFM32PG, EFR32MG, EFM32PG12, EFR32MG12: mbed RTC API is now backed by RTCC.
* On EFM32ZG, EFM32HG: mbed RTC API is sadly no longer supported, since these chips don't have retained memory.
I implemented the RTC feature.
The mainly changing is here.
- rtc_init()
Previously, I have initialized the time information register in the function, so the time count was cleaned by every calling rtc_init().
Currently, rtc_init() doesn't stop RTC from counting, and rtc_init() is safe to call repeatedly.
Therefore in order to satisfy specifications,I removed the initialization process of the time information register in the function.
- rtc_free()
Previously, I have initialized the RTC related register same as rtc_init(), so the time count was cleaned by calling rtc_free().
Currently, rtc_free() doesn't stop RTC from counting.
Therefore in order to satisfy specifications,I removed the process and decided not to do anything in the function.
If powerdown the RTC, Supply of the clock to the RTC is stopped, cannot keeping the count.
Make rtc_isenabled() to return 1 if the RTC is initialized and the time has been set; 0 otherwise.
Disable clock gate on exit from this function if RTC was initialized.
Keep the RTC code if either DEVICE_RTC or DEVICE_LOWPOWERTIMER is
defined on the devices which use the RTC for both the rtc api and the
low power timer api. This allows DEVICE_LOWPOWERTIMER to be enabled while
DEVICE_RTC is turned off.
- Disable microsecond ticker interrupt on reinitialization
- Skip us_ticker_set_interrupt() if timestamp is already past
- Eliminate tmr2Config since tmrConfig is adequate for all timer config
1. Enable LPTICKER for K22, K24, K64, K66, K82, KL82F, KW24D
2. Change the implementation to only use the LPTMR which reduces
the amount of interrupts generated which is required for tickless
operation
Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
Vincent Coubard
Wilfried Chauveau
Bartek Szatkowski
Jesse Marroquin
Martin Kojtal
Edmund Hsu
Mahesh Mahadevan
Steven Cooreman
TomoYamanaka
Przemyslaw Stekiel
Russ Butler
Ashok Rao