stm32/rtc: Allow overriding startup timeouts from mpconfigboard.

ports/stm32/rtc.c

@@ -342,18 +342,24 @@ STATIC void PYB_RTC_MspInit_Kick(RTC_HandleTypeDef *hrtc, bool rtc_use_lse, bool
     rtc_need_init_finalise = true;
 }
 
-#define PYB_LSE_TIMEOUT_VALUE 1000  // ST docs spec 2000 ms LSE startup, seems to be too pessimistic
-#define PYB_LSI_TIMEOUT_VALUE 500   // this is way too pessimistic, typ. < 1ms
-#define PYB_BYP_TIMEOUT_VALUE 150
+#ifndef MICROPY_HW_RTC_LSE_TIMEOUT_MS
+#define MICROPY_HW_RTC_LSE_TIMEOUT_MS 1000  // ST docs spec 2000 ms LSE startup, seems to be too pessimistic
+#endif
+#ifndef MICROPY_HW_RTC_LSI_TIMEOUT_MS
+#define MICROPY_HW_RTC_LSI_TIMEOUT_MS 500   // this is way too pessimistic, typ. < 1ms
+#endif
+#ifndef MICROPY_HW_RTC_BYP_TIMEOUT_MS
+#define MICROPY_HW_RTC_BYP_TIMEOUT_MS 150
+#endif
 
 STATIC HAL_StatusTypeDef PYB_RTC_MspInit_Finalise(RTC_HandleTypeDef *hrtc) {
     // we already had a kick so now wait for the corresponding ready state...
     if (rtc_use_lse) {
         // we now have to wait for LSE ready or timeout
-        uint32_t timeout = PYB_LSE_TIMEOUT_VALUE;
+        uint32_t timeout = MICROPY_HW_RTC_LSE_TIMEOUT_MS;
         #if MICROPY_HW_RTC_USE_BYPASS
         if (RCC->BDCR & RCC_BDCR_LSEBYP) {
-            timeout = PYB_BYP_TIMEOUT_VALUE;
+            timeout = MICROPY_HW_RTC_BYP_TIMEOUT_MS;
         }
         #endif
         uint32_t tickstart = rtc_startup_tick;
@@ -366,7 +372,7 @@ STATIC HAL_StatusTypeDef PYB_RTC_MspInit_Finalise(RTC_HandleTypeDef *hrtc) {
         // we now have to wait for LSI ready or timeout
         uint32_t tickstart = rtc_startup_tick;
         while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == RESET) {
-            if ((HAL_GetTick() - tickstart ) > PYB_LSI_TIMEOUT_VALUE) {
+            if ((HAL_GetTick() - tickstart ) > MICROPY_HW_RTC_LSI_TIMEOUT_MS) {
                 return HAL_TIMEOUT;
             }
         }