samd: Always provide the machine.RTC class.

Even if boards do not have a clock crystal.  In that case, the clock
quality will be very poor.

Always having machine.RTC means that the date/time can be set in a way that
is consistent with other ports.

This commit also removes the special code in modutime.c for devices without
the RTC class.

Signed-off-by: Damien George <[email protected]>

Author: robert-hh

ports/samd/mcu/samd21/mpconfigmcu.h

@@ -31,11 +31,6 @@ unsigned long trng_random_u32(int delay);
 #define MICROPY_HW_UART_TXBUF           (1)
 #endif
 
-#ifndef MICROPY_PY_MACHINE_RTC
-#if MICROPY_HW_XOSC32K
-#define MICROPY_PY_MACHINE_RTC          (1)
-#endif
-#endif
 #define MICROPY_PY_UOS_URANDOM          (1)
 
 #ifndef MICROPY_PY_MACHINE_PIN_BOARD_CPU

ports/samd/mcu/samd51/mpconfigmcu.h

@@ -28,12 +28,6 @@
 #define MICROPY_PY_URANDOM_SEED_INIT_FUNC (trng_random_u32())
 unsigned long trng_random_u32(void);
 
-#ifndef MICROPY_PY_MACHINE_RTC
-#if MICROPY_HW_XOSC32K
-#define MICROPY_PY_MACHINE_RTC          (1)
-#endif
-#endif
-
 #ifndef MICROPY_PY_MACHINE_PIN_BOARD_CPU
 #define MICROPY_PY_MACHINE_PIN_BOARD_CPU (1)
 #endif

ports/samd/modmachine.h

@@ -27,6 +27,7 @@
 #define MICROPY_INCLUDED_SAMD_MODMACHINE_H
 
 #include "py/obj.h"
+#include "shared/timeutils/timeutils.h"
 
 extern const mp_obj_type_t machine_adc_type;
 extern const mp_obj_type_t machine_dac_type;
@@ -43,4 +44,6 @@ extern const mp_obj_type_t machine_rtc_type;
 
 NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args);
 
+void rtc_gettime(timeutils_struct_time_t *tm);
+
 #endif // MICROPY_INCLUDED_SAMD_MODMACHINE_H

ports/samd/modutime.c

@@ -27,36 +27,20 @@
 #include "py/runtime.h"
 #include "extmod/utime_mphal.h"
 #include "shared/timeutils/timeutils.h"
-#include "mphalport.h"
-
-#if !MICROPY_PY_MACHINE_RTC
-uint32_t time_offset = 0;
-#endif // !MICROPY_PY_MACHINE_RTC
+#include "modmachine.h"
 
 // localtime([secs])
 STATIC mp_obj_t time_localtime(size_t n_args, const mp_obj_t *args) {
     timeutils_struct_time_t tm;
     mp_int_t seconds;
 
-    #if MICROPY_PY_MACHINE_RTC
-    extern void rtc_gettime(timeutils_struct_time_t *tm);
     if (n_args == 0 || args[0] == mp_const_none) {
         rtc_gettime(&tm);
     } else {
         seconds = mp_obj_get_int(args[0]);
         timeutils_seconds_since_epoch_to_struct_time(seconds, &tm);
     }
 
-    #else
-    if (n_args == 0 || args[0] == mp_const_none) {
-        seconds = mp_hal_ticks_ms_64() / 1000 + time_offset;
-    } else {
-        seconds = mp_obj_get_int(args[0]);
-        time_offset = seconds - mp_hal_ticks_ms_64() / 1000;
-    }
-    timeutils_seconds_since_epoch_to_struct_time(seconds, &tm);
-
-    #endif // MICROPY_PY_MACHINE_RTC
     mp_obj_t tuple[8] = {
         tuple[0] = mp_obj_new_int(tm.tm_year),
         tuple[1] = mp_obj_new_int(tm.tm_mon),
@@ -90,17 +74,10 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(time_mktime_obj, time_mktime);
 
 // time()
 STATIC mp_obj_t time_time(void) {
-    #if MICROPY_PY_MACHINE_RTC
-    extern void rtc_gettime(timeutils_struct_time_t *tm);
     timeutils_struct_time_t tm;
     rtc_gettime(&tm);
     return mp_obj_new_int_from_uint(timeutils_mktime(
         tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec));
-
-    #else
-    return mp_obj_new_int_from_uint(mp_hal_ticks_ms_64() / 1000 + time_offset);
-
-    #endif // MICROPY_PY_MACHINE_RTC
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(time_time_obj, time_time);
 

ports/samd/mpconfigport.h

@@ -92,6 +92,7 @@
 #define MICROPY_PY_UZLIB                    (1)
 #define MICROPY_PY_UASYNCIO                 (1)
 #define MICROPY_PY_MACHINE_I2C              (1)
+#define MICROPY_PY_MACHINE_RTC              (1)
 #define MICROPY_PY_MACHINE_SOFTI2C          (1)
 #define MICROPY_PY_MACHINE_SPI              (1)
 #define MICROPY_PY_MACHINE_SOFTSPI          (1)