Ultra low power mode with WP7702

1

I am trying to setup a wp7702 in ultra low power mode but something is not working:
Following this sample code:

but to start with, this will not work unless I set the shutdown strategy:

LE_ERROR_IF(le_ulpm_BootOnTimer(30) != LE_OK, “Can’t set timer as boot source”);
LE_ERROR_IF(le_ulpm_BootOnGpio(38, LE_ULPM_GPIO_LOW) != LE_OK, “Can’t set gpio38 as boot source”);
LE_ERROR_IF(le_ulpm_SetShutDownStrategy(LE_ULPM_ULPM_ONLY) != LE_OK, “Can`t set the shutdown strategy”);
// Initiate shutdown.
LE_ERROR_IF(le_ulpm_ShutDown() != LE_OK, “Can’t initiate shutdown”);

I can trigger the shutdown to ULPM but for some reason the device will wake up even if the GPIO38 is not connected to +Vref.

2

have you tried with AT!POWERMODE and AT!POWERWAKE to verify first

3

I am trying the the pmtool and that one will not work either, this is the version on
Ultra Low Power Manager Firmware Version: 002.015
root@fx30:~# pmtool bootOn gpio 36 rising
SUCCESS!
root@fx30:~# pmtool bootOn gpio 38 falling
SUCCESS!
root@fx30:~# pmtool bootOn timer 10000
SUCCESS!
root@fx30:~# pmtool shutdown
Initiated shutdown of MDM

The unit doesn`t not power down and keeps running as normal.
Is there any other service which is preventing the ULPM?

4

AT!POWERMODE
ERROR
AT!POWERWAKE
ERROR

This is what I get in reply

5

please see AT command user guide

6

I can`t find that command in the user manual of the FX30, I did check with this:
AT!POWERMODE?
!POWERMODE: No request, status=2-Initialized

OK

do you have any link to how to use this AT command?

7

you can download the WP77 AT command use guide

8

I can set it into ULPM with the command:
AT!POWERMODE=3
but it doesn`t seems that GPI38 (IO2) is waking it up, this was set with:
AT!POWERWAKE=2,38,high
OK

I have also tried with the command:
AT!POWERWAKE=2,38,low
OK

the ULPM seems supported as if I change the timer:
AT!POWERWAKE=1,10
OK
AT!POWERMODE=3

then the unit will switch off and then to turn back on after 10s.
But I am unsure why the wakeup with GPIO38 is not working…
ULPM WAKE2 GPIO38 (SPI2_CLK) SWIMCU PTB0 SWIMCU PTB0
Do I need to activate anything in the software before this is enabled?
As I am connecting Ground (also tried with +Vref) to IO2 (GPIO21) and this doesn`t wake up the unit. But I am unsure if GPIO38 is internally linked to GPIO21 (they should be).

9

why do you set the edge trigger like that?

image
image422×203 9.15 KB

you can also see this document on how to set wakeup source (at least can make sure the GPIO pin is working fine):

10

ok, it does work by using the <2>, low level trigger.
Still doesn`t work with the pmtool of legato…

11

i never use pmtool
you can send AT command for your application