We are using a DW3220 with the decawave driver API in our product.
Procedure:
As part of the initialization of the chip we do
dwt_configuresleep(
(DWT_CONFIG | DWT_PGFCAL),
(DWT_PRES_SLEEP | DWT_SLP_EN | DWT_WAKE_CSN));
/* ... */
/* RxOK. SFDOK leds, needs to be done first 'cause it overrides the whole
* gpio mode mask, rendering dwt_setleds useless if done first. */
dwt_setgpiomode(GPIO0_FUNC_MASK | GPIO1_FUNC_MASK,
DW3000_GPIO_PIN0_RXOKLED | DW3000_GPIO_PIN1_SFDLED);
/* Rx, Tx leds, Blink on init */
dwt_setleds(DWT_LEDS_ENABLE | DWT_LEDS_INIT_BLINK);
to configure GPIOs for the four LEDs we have on our board. This all works fine, until I actually activate the DEEPSLEEP mode with dwt_entersleep(DWT_DW_IDLE);.
After some time I wakeup the IC again, using
dwt_wakeup_ic(); /*< implementation of this ensures long-enough wait times after toggle */
if(!dwt_checkidlerc())
return false;
dwt_restoreconfig();
This also works, and the chips continues to receive and transmit afterwards.
However, the LEDs no longer come on, unless I also do dwt_setleds(DWT_LEDS_ENABLE); after the wakeup.
The LED_CTRL and GPIO_MODE registers are as expected after the wakeup, so I assume some other necessary register is not retained in, or restored from, AON automatically or by the driver.
Questions:
- What else do I need to reconfigure after waking up from DEEPSLEEP?
- Where can I find documentation describing which registers are actually retained in AON?
- For dwt_configuresleep the API exposes additional flags to pass as the ‘mode’ which are not documented in the AON_DIG_CFG register description. What am I supposed to do with those?
Help is much appreciated! Thank you!