SBC FS65 - Cannot use the LDT Timer twice in a row

gabriel-fz — Wed, 08 Feb 2023 19:08:55 GMT

Hi,

I'm trying to use the LDT timer to make my system sleep for a specific amount of time.

The following function configures my LDT:

// The counter must be disabled (~ENABLE) before reading its value and enabled again. bool const counter_should_be_running = false; status = FS65_LDT_RunCounter(counter_should_be_running); if (status != fs65StatusOk) return -1; // Long Duration Timer // The timer is configurable by the SPI and can operate in normal mode and low-power mode // The LDT as multiple functions // Function 4: In low-power mode, count until the counter reaches the wake-up value and wakes up. // // NXP FS6500, Product data sheet rev7.0, 12.8.3 Timer operation fs65_ldt_function_t const timer_is_our_alarm_clock = fs65LdtFunc4; status = FS65_LDT_SetTimerOperation(timer_is_our_alarm_clock); if (status != fs65StatusOk) return -1; // When function 4 is selected and the counter reaches the wake-up value (EOT), the device wakes up and the counter // is stopped. // // NXP FS6500, Product data sheet rev7.0, 12.8.3 Timer operation uint32_t const wakeup_value = sleep_time_sec; //< The timer is configured at 1 Hz status = FS65_LDT_SetWakeUpValue(wakeup_value); if (status != fs65StatusOk) return -2; bool const start_running = true; status = FS65_LDT_RunCounter(start_running); if (status != fs65StatusOk) return -3;

The first time I call this function it works great.
The problem occurs when I call this function a second time: the LDT timer refuses to be disabled.

More specifically, the FS65_LDT_RunCounter(false) function fails because LDT_ENABLE is still set to 1.

The proof of the LDT_ENABLE is still set.

What is the proper way to configure the timer so it can be used twice in a row?

Regards,
Gabriel

Re: SBC FS65 - Cannot use the LDT Timer twice in a row

guoweisun — Thu, 09 Feb 2023 01:48:20 GMT

what do you mean twice in a row?

First time use the LDT wakeup SBC from LPOFF mode, now the SBC is waken up,what about the second time LDT?

Power ManagementのトピックSBC FS65 - Cannot use the LDT Timer twice in a row

SBC FS65 - Cannot use the LDT Timer twice in a row

Re: SBC FS65 - Cannot use the LDT Timer twice in a row