Hi Joakim.
I 've been playing with your PR here:
https://github.com/gebart/RIOT/tree/pr/kinetis-pm.
To make it work with my custom board, I made some changes in my local board
definition:
* include/periph_conf.h
#define LPTMR_NUMOF (1U)
#define LPTMR_CONFIG { \
{ \
.dev = LPTMR0, \
.base_freq = 32768u, \
.llwu = LLWU_WAKEUP_MODULE_LPTMR0, \
.src = 2, \
.irqn = LPTMR0_IRQn, \
}, \
}
* include/board.h
/* LPTMR xtimer configuration */
#define XTIMER_DEV (TIMER_LPTMR_DEV(0))
#define XTIMER_CHAN (0)
/* LPTMR is 16 bits wide and runs at 32768 Hz (clocked by the RTC) */
#define XTIMER_WIDTH (16)
#define XTIMER_BACKOFF (5)
#define XTIMER_ISR_BACKOFF (5)
#define XTIMER_OVERHEAD (4)
#define XTIMER_HZ (32768ul)
Is that right ?
After that, I found out low power modes were blocked because of some
PM_BLOCK() in UART.
As a workaround, I added uart_poweroff(UART_DEV(0)) before xtimer_sleep()
in my main thread loop.
(So the uart don't limit pm_set_lowest() )
Since I flashed this new binary, I cannot connect anymore my board through
openocd/jlink/swd.
I'm wondering if my board is bricked (maybe the low power mode shuts down
JTAG too fast after boot ? )
As soon as I have a new working board, I'll continue working on your code.
(Of course I'll add safeguard so low power mode cannot activate that fast
at poweron)
Any ideas/comment welcome
Thanks
Olivier.
Le ven. 16 nov. 2018 à 08:14, Joakim Nohlgård <[email protected]> a
écrit :
> Hi again,
>
> On Thu, Nov 15, 2018 at 10:36 PM Olivier Fauchon <[email protected]>
> wrote:
> >
> > Hi.
> > It seems the board I use don't have LPTMR declared :
> >
> >
> https://github.com/RIOT-OS/RIOT/blob/master/boards/pba-d-01-kw2x/include/periph_conf.h
> >
> > #define PIT_NUMOF (2U)
> > #define PIT_CONFIG { \
> > { \
> > .prescaler_ch = 0, \
> > .count_ch = 1, \
> > }, \
> > { \
> > .prescaler_ch = 2, \
> > .count_ch = 3, \
> > }, \
> > }
> > #define LPTMR_NUMOF (0U)
> > #define LPTMR_CONFIG {}
> > #define TIMER_NUMOF ((PIT_NUMOF) + (LPTMR_NUMOF))
> >
> >
> > Can you confirm I need to declare LPTMR to get Low Power Mode working ?
>
> You will need LPTMR if you want to be able to use low power modes when
> you are using the xtimer module, which is usually required for things
> like network timeouts etc.
>
> > Do you have example of working LPTMR declarations ?
>
> Yes, look at the other Kinetis based boards in the tree. Here is one
> example from FRDM-K22F:
>
> https://github.com/RIOT-OS/RIOT/blob/836fe3dbbaba8b65bf23110c8b56cbaf1558c022/boards/frdm-k22f/include/periph_conf.h#L82-L90
>
> #define LPTMR_NUMOF (1U)
> #define LPTMR_CONFIG { \
> { \
> .dev = LPTMR0, \
> .irqn = LPTMR0_IRQn, \
> .src = 2, \
> .base_freq = 32768u, \
> }, \
> }
>
>
> /Joakim
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