saramonteiro commented on a change in pull request #3794:
URL: https://github.com/apache/incubator-nuttx/pull/3794#discussion_r642439500
##########
File path: arch/risc-v/src/esp32c3/esp32c3_rtc.c
##########
@@ -2135,3 +2246,415 @@ void IRAM_ATTR
esp32c3_rtc_sleep_set_wakeup_time(uint64_t t)
modifyreg32(RTC_CNTL_INT_CLR_REG, 0, RTC_CNTL_MAIN_TIMER_INT_CLR_M);
modifyreg32(RTC_CNTL_SLP_TIMER1_REG, 0, RTC_CNTL_MAIN_TIMER_ALARM_EN_M);
}
+
+/****************************************************************************
+ * Name: esp32c3_rtc_set_boot_time
+ *
+ * Description:
+ * Set time to RTC register to replace the original boot time.
+ *
+ * Input Parameters:
+ * time_us - set time in microseconds.
+ *
+ * Returned Value:
+ * None
+ *
+ ****************************************************************************/
+
+void IRAM_ATTR esp32c3_rtc_set_boot_time(uint64_t time_us)
+{
+ putreg32((uint32_t)(time_us & 0xffffffff), RTC_BOOT_TIME_LOW_REG);
+ putreg32((uint32_t)(time_us >> 32), RTC_BOOT_TIME_HIGH_REG);
+}
+
+/****************************************************************************
+ * Name: esp32c3_rtc_get_boot_time
+ *
+ * Description:
+ * Get time of RTC register to indicate the original boot time.
+ *
+ * Input Parameters:
+ * None
+ *
+ * Returned Value:
+ * time_us - get time in microseconds.
+ *
+ ****************************************************************************/
+
+uint64_t IRAM_ATTR esp32c3_rtc_get_boot_time(void)
+{
+ return ((uint64_t)getreg32(RTC_BOOT_TIME_LOW_REG))
+ + (((uint64_t)getreg32(RTC_BOOT_TIME_HIGH_REG)) << 32);
+}
+
+#ifdef CONFIG_RTC_DRIVER
+
+/****************************************************************************
+ * Name: up_rtc_time
+ *
+ * Description:
+ * Get the current time in seconds. This is similar to the standard time()
+ * function. This interface is only required if the low-resolution
+ * RTC/counter hardware implementation selected. It is only used by the
+ * RTOS during initialization to set up the system time when CONFIG_RTC is
+ * set but neither CONFIG_RTC_HIRES nor CONFIG_RTC_DATETIME are set.
+ *
+ * Input Parameters:
+ * None
+ *
+ * Returned Value:
+ * The current time in seconds
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_RTC_HIRES
+time_t up_rtc_time(void)
+{
+ uint64_t time_us;
+ irqstate_t flags;
+
+ flags = spin_lock_irqsave(NULL);
+
+ if (g_rt_timer_enabled == true)
+ {
+ time_us = rt_timer_time_us() + g_rtc_save->offset +
+ esp32c3_rtc_get_boot_time();
+ }
+ else
+ {
+ time_us = esp32c3_rtc_get_time_us() +
+ esp32c3_rtc_get_boot_time();
+ }
+
+ spin_unlock_irqrestore(NULL, flags);
+
+ return (time_t)(time_us / USEC_PER_SEC);
+}
+#endif /* CONFIG_RTC_HIRES */
+
+/****************************************************************************
+ * Name: up_rtc_settime
+ *
+ * Description:
+ * Set the RTC to the provided time. All RTC implementations must be
+ * able to set their time based on a standard timespec.
+ *
+ * Input Parameters:
+ * tp - the time to use
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+int up_rtc_settime(FAR const struct timespec *ts)
+{
+ irqstate_t flags;
+ uint64_t now_us;
+ uint64_t rtc_offset_us;
+
+ DEBUGASSERT(ts != NULL && ts->tv_nsec < NSEC_PER_SEC);
+ flags = spin_lock_irqsave(NULL);
+
+ now_us = ((uint64_t) ts->tv_sec) * USEC_PER_SEC +
+ ts->tv_nsec / NSEC_PER_USEC;
+ if (g_rt_timer_enabled == true)
+ {
+ rtc_offset_us = now_us - rt_timer_time_us();
+ }
+ else
+ {
+ rtc_offset_us = now_us - esp32c3_rtc_get_time_us();
+ }
+
+ g_rtc_save->offset = 0;
+ esp32c3_rtc_set_boot_time(rtc_offset_us);
+
+ spin_unlock_irqrestore(NULL, flags);
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: up_rtc_initialize
+ *
+ * Description:
+ * Initialize the hardware RTC per the selected configuration.
+ * This function is called once during the OS initialization sequence
+ *
+ * Input Parameters:
+ * None
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+int up_rtc_initialize(void)
+{
+#ifndef CONFIG_PM
+ /* Initialize RTC controller parameters */
+
+ esp32c3_rtc_init();
+ esp32c3_rtc_clk_set();
+#endif
+
+ g_rtc_save = &rtc_saved_data;
+
+ /* If saved data is invalid, clear offset information */
+
+ if (g_rtc_save->magic != MAGIC_RTC_SAVE)
+ {
+ g_rtc_save->magic = MAGIC_RTC_SAVE;
+ g_rtc_save->offset = 0;
+ esp32c3_rtc_set_boot_time(0);
+ }
+
+#ifdef CONFIG_RTC_HIRES
+ /* Synchronize the base time to the RTC time */
+
+ up_rtc_gettime(&g_basetime);
+#endif
+
+ g_rtc_enabled = true;
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: up_rtc_gettime
+ *
+ * Description:
+ * Get the current time from the high resolution RTC time or RT-Timer. This
+ * interface is only supported by the high-resolution RTC/counter hardware
+ * implementation. It is used to replace the system timer.
+ *
+ * Input Parameters:
+ * tp - The location to return the RTC time or RT-Timer value.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_HIRES
+int up_rtc_gettime(FAR struct timespec *tp)
+{
+ irqstate_t flags;
+ uint64_t time_us;
+
+ flags = spin_lock_irqsave(NULL);
+
+ if (g_rt_timer_enabled == true)
+ {
+ time_us = rt_timer_time_us() + g_rtc_save->offset +
+ esp32c3_rtc_get_boot_time();
+ }
+ else
+ {
+ time_us = = esp32c3_rtc_get_time_us() +
+ esp32c3_rtc_get_boot_time();
+ }
+
+ tp->tv_sec = time_us / USEC_PER_SEC;
+ tp->tv_nsec = (time_us % USEC_PER_SEC) * NSEC_PER_USEC;
+
+ spin_unlock_irqrestore(NULL, flags);
+
+ return OK;
+}
+#endif /* CONFIG_RTC_HIRES */
+
+#ifdef CONFIG_RTC_ALARM
+
+/****************************************************************************
+ * Name: up_rtc_setalarm
+ *
+ * Description:
+ * Set up an alarm.
+ *
+ * Input Parameters:
+ * alminfo - Information about the alarm configuration.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+int up_rtc_setalarm(FAR struct alm_setalarm_s *alminfo)
+{
+ struct rt_timer_args_s rt_timer_args;
+ FAR struct alm_cbinfo_s *cbinfo;
+ irqstate_t flags;
+ int ret = -EBUSY;
+ int id;
+
+ DEBUGASSERT(alminfo != NULL);
+ DEBUGASSERT((RTC_ALARM0 <= alminfo->as_id) &&
+ (alminfo->as_id < RTC_ALARM_LAST));
+
+ /* Set the alarm in RT-Timer */
+
+ id = alminfo->as_id;
+ cbinfo = &g_alarmcb[id];
+
+ if (cbinfo->ac_cb == NULL)
+ {
+ /* Create the RT-Timer alarm */
+
+ flags = spin_lock_irqsave(NULL);
+
+ if (cbinfo->alarm_hdl == NULL)
+ {
+ cbinfo->index = id;
+ rt_timer_args.arg = cbinfo;
+ rt_timer_args.callback = esp32c3_rt_cb_handler;
+ ret = rt_timer_create(&rt_timer_args, &cbinfo->alarm_hdl);
+ if (ret)
+ {
+ rtcerr("ERROR: Failed to create rt_timer error=%d\n", ret);
+ spin_unlock_irqrestore(NULL, flags);
+ return ret;
+ }
+ }
+
+ cbinfo->ac_cb = alminfo->as_cb;
+ cbinfo->ac_arg = alminfo->as_arg;
+ cbinfo->deadline_us = alminfo->as_time.tv_sec * USEC_PER_SEC +
+ alminfo->as_time.tv_nsec / NSEC_PER_USEC;
+
+ if (cbinfo->alarm_hdl == NULL)
+ {
+ rtcerr("ERROR: failed to creat alarm timer\n");
Review comment:
```suggestion
rtcerr("ERROR: failed to create alarm timer\n");
```
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