RTC Clock Reference [ARM register]

jeremym1987 · August 31, 2023, 3:21pm

What register/address does the RTC class use for its reference?

J-M-L · August 31, 2023, 4:46pm

the Renesas Uno R4 WiFi leverages the Renesas Flexible Software Package and so they use the RTC driver module

you can see that in the RTC library where they use R_RTC_Open() and R_RTC_CalendarTimeGet() for example

the config looks like this

arduino/ArduinoCore-renesas/blob/2e565262430e1f7351cb13a13964f26035d11209/libraries/RTC/src/RTC.cpp#L446-L463


      
          rtc_cfg_t rtc_cfg  = { 
              // TODO: change me to RTC_CLOCK_SOURCE_SUBCLK when capacitors are mounted
              // https://arduino.atlassian.net/browse/HWH33-204
              // Fixes counting time in VBAT mode on H33
              // Leave as is for Santiago
              .clock_source = RTC_CLOCK_SOURCE_LOCO,
              .freq_compare_value_loco = 255, 
              .p_err_cfg = &rtc_err_cfg, 
              .alarm_ipl = (12), 
              .alarm_irq = FSP_INVALID_VECTOR,
              .periodic_ipl = (12), 
              .periodic_irq = FSP_INVALID_VECTOR,
              .carry_ipl = (12),
              .carry_irq = FSP_INVALID_VECTOR,
              .p_callback = rtc_callback,
              .p_context = NULL, 
              
          };

jeremym1987 · August 31, 2023, 4:52pm

Thanks, I just found the very thing in RTC.cpp.

I'm looking for the RTC_CLOCK_SOURCE_LOCO define now.

MartinL · August 31, 2023, 6:58pm

Hi @jeremym1987

github.com

renesas/fsp/blob/master/ra/fsp/inc/api/r_rtc_api.h#L83-L88


      
          /** Clock source for the RTC block */
          typedef enum e_rtc_count_source
          {
              RTC_CLOCK_SOURCE_SUBCLK  = 0,      ///< Sub-clock oscillator
              RTC_CLOCK_SOURCE_LOCO    = 1,      ///< Low power On Chip Oscillator
              RTC_CLOCK_SOURCE_MAINCLK = 2       ///< Main clock oscillator

J-M-L · August 31, 2023, 8:41pm

it's part of the API

https://renesas.github.io/fsp/group___r_t_c___a_p_i.html#gad8eef26a825fa4a0c5a417f8be08ccc6

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RTC Clock Reference [ARM register]

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